LINAC2022 - List of Keywords (MEBT)

Paper	Title	Other Keywords	Page
MO1AA01	Upgrades and Developments at the ISIS Linac	rfq, linac, operation, quadrupole	1
	A.P. Letchford STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The ISIS Spallation Neutron Source at the Rutherford Appleton Laboratory (RAL) in the UK has a 70 MeV H⁻ linac operating at 202.5 MHz. The linac consists of a 665 keV RFQ and a 4-tank Drift Tube Linac (DTL). In order to ensure continued reliability, increase performance and lay the groundwork for possible facility upgrades in the future a programme of R&D has been taking place in recent years. This paper will discuss three components of that programme: the complete replacement of DTL Tank 4; the design of a Medium Energy beam Transport (MEBT) between the RFQ and DTL; and the Front End Test Stand (FETS), a demonstrator for the front end of a future high current, high energy linac.
	Slides MO1AA01 [26.001 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MO1AA01
About •	Received ※ 16 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 27 August 2022 — Issue date ※ 27 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MO1PA01	Beam Commissioning and Integrated Test of the PIP-II Injector Test Facility	cavity, MMI, cryomodule, operation	13
	E. Pozdeyev, R. Andrews, C.M. Baffes, M. Ball, C. Boffo, R. Campos, J.-P. Carneiro, B.E. Chase, A.Z. Chen, D.J. Crawford, J. Czajkowski, N. Eddy, M. El Baz, M.G. Geelhoed, V.M. Grzelak, P.M. Hanlet, B.M. Hanna, B.J. Hansen, E.R. Harms, B.F. Harrison, M.A. Ibrahim, K.R. Kendziora, M.J. Kucera, D.D. Lambert, J.R. Leibfritz, P. Lyalyutskyy, J.N. Makara, H. Maniar, L. Merminga, R. Neswold, D.J. Nicklaus, J.P. Ozelis, D. Passarelli, N. Patel, D.W. Peterson, L.R. Prost, G.W. Saewert, A. Saini, V.E. Scarpine, A.V. Shemyakin, J. Steimel, A.I. Sukhanov, P. Varghese, R. Wang, A. Warner, G. Wu, R.M. Zifko Fermilab, Batavia, Illinois, USA V.K. Mishra, M.M. Pande, K. Singh, Vikas. Teotia BARC, Mumbai, India
	The PIP-II Injector Test (PIP2IT) facility is a near-complete low energy portion of the Superconducting PIP-II linac driver. PIP2IT comprises the warm front end and the first two PIP-II superconducting cryomodules. PIP2IT is designed to accelerate a 2 mA H⁻ beam to an energy of 20 MeV. The facility serves as a testbed for a number of advanced technologies required to operate PIP-II and provides an opportunity to gain experience with commissioning of the superconducting linac, significantly reducing project technical risks. Some PIP2IT components are contributions from international partners, who also lend their expertise to the accelerator project. The project has been successfully commissioned with the beam in 2021, demonstrating the performance required for the LBNF/DUNE. In this paper, we describe the facility and its critical systems. We discuss our experience with the integrated testing and beam commissioning of PIP2IT, and present commissioning results. This important milestone ushers in a new era at Fermilab of proton beam delivery using superconducting radio-frequency accelerators.

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	Slides MO1PA01 [2.714 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MO1PA01
About •	Received ※ 16 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 13 October 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPORI02	Implementation of an Advanced MicroTCA.4-based Digitizer for Monitoring Comb-Like Beam at the J-PARC Linac	linac, monitoring, DTL, operation	219
	E. Cicek, K. Futatsukawa, T. Miyao, S. Mizobata KEK, Ibaraki, Japan N. Hayashi, A. Miura, K. Moriya JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
	The Japan Proton Accelerator Research Complex (J-PARC) linac beam pulse, generated by a beam chopper system placed at the MEBT, comprises a series of intermediate pulses with a comb-like structure synchronized with the radio-frequency of the rapid cycling synchrotron (RCS). The sequentially measuring and monitoring the comb-like beam pulse ensures the beam stability with less beam loss at the current operation and higher beam intensity scenarios at the J-PARC. However, signal processing as a function of the pulse structure is challenging using a general-purpose digitizer, and monitoring the entire macro pulse during the beam operation is unavailable. To this end, an advanced beam monitor digitizer complying with the MicroTCA.4 (MicroTelecommunications Computing Architecture.4) standard, including digital signal processing functions, has been developed. This paper reports the implementation, performance evaluation, and the first results of this unique beam monitor digitizer.
	Poster MOPORI02 [7.902 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI02
About •	Received ※ 13 August 2022 — Accepted ※ 22 August 2022 — Issue date ※ 01 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOJO11	Design of Beam Focusing System with Permanent Magnet for J-PARC LINAC MEBT1	octupole, linac, focusing, emittance	364
	Y. Fuwa, K. Moriya, T. Takayanagi JAEA/J-PARC, Tokai-mura, Japan
	Space charge compensation technology using higher-order multipole magnetic field components has been proposed to transport high-intensity charged particle beams for J-PARC LINAC MEBT1. In order to realize this compensation technology in a limited beam line space, we devised a compact-size combined-function multipole permanent magnet. This magnet can produce two multipole components at the same location on the beam line. As a first step, we have designed a magnet to simultaneously generate a fixed-strength quadrupole and an adjustable-strength octupole component using permanent magnet materials. In this magnet model, the magnetic circuit consists of two groups of magnets.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO11
About •	Received ※ 20 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOJO13	Wire Scanner Systems at the European Spallation Source (ESS): Tests and First Beam Commissioning Results	detector, linac, MMI, controls	372
	C.S. Derrez, I. Bustinduy, E.M. Donegani, V. Grishin, H. Kocevar, J.P.S. Martins, N. Milas, R. Miyamoto, T.J. Shea, R. Tarkeshian, C.A. Thomas, P.L. van Velze ESS, Lund, Sweden S. Cleva, R. De Monte, M. Ferianis, S. Grulja Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy I. Mazkiaran, A.R. Páramo ESS Bilbao, Zamudio, Spain
	The ESS beam instrumentation includes 3 different type of Wire Scanners (WS). Double wires systems are deployed in the MEBT part of NCL, and single wires and flying wire instruments are being tested and installed in the higher energy sections of the ESS linac. First beam tests result from the MEBT systems will be presented. The superconducting linac WS systems are based on scintillator detectors and wavelength shifting fibers are mounted on the beam pipe. The detectors are coupled to long haul optical fibers, which carry the signals to custom front end electronics sitting in controls racks at the surface. The acquisition chain have been characterized at IHEP (Protvino, Russia), ELETTRA (Trieste, Italy), CERN PSB, CoSy (IKP, Germany) and SNS (USA) before installation in the ESS tunnel. The test results of this system design, differing from the standard approach where photomultipliers are coupled to the scintillator will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO13
About •	Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 01 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOJO14	Status of Testing and Commissioning of the Medium Energy Beam Transport Line of the ESS Normal Conducting Linac	cavity, linac, MMI, quadrupole	376
	A.G. Sosa, R.A. Baron, H. Danared, C.S. Derrez, E.M. Donegani, M. Eshraqi, V. Grishin, A. Jansson, M. Jensen, B. Jones, E. Laface, B. Lagoguez, Y. Levinsen, J.P.S. Martins, N. Milas, R. Miyamoto, D.J.P. Nicosia, D. Noll, D.C. Plostinar, T.J. Shea, R. Tarkeshian, C.A. Thomas, E. Trachanas, P.L. van Velze ESS, Lund, Sweden I. Bustinduy, A. Conde, D. Fernández-Cañoto, N. Garmendia, P.J. González, G. Harper, A. Kaftoosian, J. Martin, I. Mazkiaran, J.L. Muñoz, A.R. Páramo, S. Varnasseri, A.Z. Zugazaga ESS Bilbao, Zamudio, Spain
	The latest beam commissioning phase of the Normal Conducting Linac at ESS delivered a proton beam through the Medium Energy Beam Transport (MEBT) into the first Drift Tube Linac (DTL) tank. The probe beam in MEBT consisted of 3.6 MeV protons of <6 mA, <5 microseconds pulse length and 1 Hz repetition rate. Following the delivery of the components at ESS in Lund in June 2019, the commissioning phase with the MEBT was completed in July 2022. In March 2022, the maximum beam current of 62.5 mA was transported up to the MEBT Faraday cup. This proceeding focuses on the status of MEBT including magnets, buncher cavities, scrapers and beam diagnostics designed and tested in collaboration with ESS Bilbao.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO14
About •	Received ※ 13 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 01 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOJO21	The Pre-Injector Upgrade for the ISIS H⁻ Linac	ion-source, plasma, linac, MMI	398
	S.R. Lawrie, R.E. Abel, C. Cahill, D.C. Faircloth, A.P. Letchford, J.H. Macgregor, S. Patel, T.M. Sarmento, J.D. Speed, O.A. Tarvainen, M. Whitehead, T. Wood STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	A new maintenance-free, high current, high duty-factor H⁻ linac pre-injector is being commissioned for the ISIS pulsed spallation neutron and muon facility. As well as delivering a low emittance-growth, loss-free beam, the pre-injector incorporates a chopper to facilitate arbitrary bunch time-structures. A 50 Hz, 0.9 ms (4.5% duty factor) RF-driven H⁻ ion source operates extremely reliably and with a large available parameter space via a novel microwave ignition gun and a wideband solid-state RF amplifier. A 202.5 MHz medium energy beam transport (MEBT) incorporates eight quadrupole magnets with integrated xy steerers, four quarter-wave re-bunching cavities, four extremely compact beam position monitors and an electrostatic chopper in just two metres of footprint. Beam has been extracted from the ion source and MEBT commissioning is due Spring 2023. Thereafter, the entire pre-injector will be soak-tested offline for a year before installing on the user facility.
	Slides TUPOJO21 [1.784 MB]
	Poster TUPOJO21 [3.053 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO21
About •	Received ※ 13 August 2022 — Revised ※ 16 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 05 September 2022
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TUPORI24	Beam Dynamics Studies at the PIP-II Injector Test Facility	cryomodule, rfq, emittance, solenoid	601
	J.-P. Carneiro, B.M. Hanna, E. Pozdeyev, L.R. Prost, A. Saini, A.V. Shemyakin Fermilab, Batavia, Illinois, USA
	A series of beam dynamic studies were performed in 2020-2021 at the PIP-II Injector Test Facility (PIP2IT) that has been built to validate the concept of the front-end of the PIP-II linac being constructed at Fermilab. PIP2IT is comprised of a 30-keV H⁻ ion source, a 2 m-long Low Energy Beam Transport (LEBT), a 2.1- MeV CW RFQ, followed by a 10-m Medium Energy Beam Transport (MEBT), 2 cryomodules accelerating the beam to 16 MeV and a High-Energy Beam Transport (HEBT) bringing the beam to an absorber. This paper presents beam dynamics - related measurements performed at PIP2IT as the Twiss parameters with Allison scanners, beam envelopes along the injector, and transverse and longitudinal rms emittance reconstruction. These measurements are compared with predictions from the beam dynamics code Tracewin.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI24
About •	Received ※ 21 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 15 September 2022
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TUPORI25	Finding Beam Loss Locations at PIP2IT Accelerator With Oscillating Dipole Correctors	dipole, cryomodule, linac, betatron	605
	A.V. Shemyakin Fermilab, Batavia, Illinois, USA
	Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics The PIP2IT accelerator was assembled in multiple stages in 2014 - 2021 to test concepts and components of the future PIP-II linac that is being constructed at Fermilab. In its final configuration, PIP2IT accelerated a 0.55 ms x 20 Hz x 2 mA H⁻ beam to 16 MeV. To determine location of the beam loss in the accelerator’s low-energy part, where radiation monitors are ineffective, a method using oscillating trajectories was implemented. If the beam is scraped at an aperture limitation, moving its centroid with two dipole correctors located upstream and oscillating in sync, produces a line at the corresponding frequency in spectra of BPM sum signals downstream of the loss point. Comparison of these responses along the beam line allows to find the loss location. The paper describes the method and results of its implementation at PIP2IT.
	Slides TUPORI25 [0.447 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI25
About •	Received ※ 24 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 15 September 2022
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FR1AA04	SARAF Commissioning: Injector, MEBT and Chopper	rfq, emittance, diagnostics, MMI	872
	J. Dumas, D. Chirpaz, D. Darde, J. Dumas, R.D. Duperrier, G. Ferrand, A. Gaget, F. Gohier, F. Gougnaud, T.J. Joannem, V. Nadot, N. Pichoff, F. Senée, C. Simon, D.U. Uriot, L. Zhao CEA-IRFU, Gif-sur-Yvette, France A. Chancé CEA, Gif-sur-Yvette, France S. Cohen, I.G. Gertz, N. Goldberger, H. Isakov, B. Kaizer, A. Kreisel, J. Luner, I. Mardor, H. Paami, A. Perry, I. Polikarpov, E. Reinfeld, J. Rodnitsky, I. Shmuely, A. Shor, Y. Solomon, N. Tamim, R. Weiss-Babai, L. Weissman, T. Zchut Soreq NRC, Yavne, Israel G. Desmarchelier, N. Solenne CEA-DRF-IRFU, France
	IAEC/SNRC (Israel) is constructing an accelerator fa-cility, SARAF, for neutron production. It is based on a linac accelerating 5 mA CW deuteron and proton beam up to 40 MeV. As a first phase, IAEC constructed and operated a linac (SARAF Phase I), from which remains an ECR ion source, a Low-Energy Beam Transport (LEBT) line and a 4-rod RFQ. Since 2015, IAEC and CEA (France) are collaborating in the second phase, consisting in manufacturing of the linac (Figure 1). The injector control-system has been recently updated and the Medium Energy Beam Transport (MEBT) line has been installed and integrated to the infrastructure. It has been partially commissioned during the first semester of 2022. This paper presents the results of the integration, tests and commissioning of the injector and MEBT, be-fore delivery of the cryomodules.

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	Slides FR1AA04 [2.971 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-FR1AA04
About •	Received ※ 21 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 14 September 2022 — Issue date ※ 15 September 2022
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FR1AA05	Design Considerations for a Proton Linac for a Compact Accelerator Based Neutron Source	DTL, emittance, neutron, rfq	878
	M. Abbaslou UVIC, Victoria, Canada A. Gottberg, O.K. Kester, R.E. Laxdal, M. Marchetto TRIUMF, Vancouver, Canada D.D. Maharaj, D. Marquardt University of Windsor, Windsor, Ontario, Canada S. Tabbassum Purdue University, West Lafayette, Indiana, USA
	New neutron sources are needed both for Canada and internationally as access to reactor based neutrons shrinks. Compact Accelerator-based Neutron Sources (CANS) offer the possibility of an intense source of pulsed neutrons with a capital cost significantly lower than spallation sources. In an effort to close the neutron gap in Canada a prototype, Canadian compact accelerator-based neutron source (PC-CANS) is proposed for installation at the University of Windsor. The PC-CANS is envisaged to serve two neutron science instruments, a boron neutron capture therapy (BNCT) station and a beamline for fluorine-18 radioisotope production for positron emission tomography (PET). To serve these diverse applications of neutron beams, a linear accelerator solution is selected, that will provide 10 MeV protons with a peak current of 10 mA within a 5% duty cycle. The accelerator is based on an RFQ and DTL with a post-DTL pulsed kicker system to simultaneously deliver macro-pulses to each end-station. Several choices of Linac technology are being considered and a comparison of the choices will be presented.

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	Slides FR1AA05 [1.945 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-FR1AA05
About •	Received ※ 27 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 03 September 2022
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Paper

Title

Other Keywords

Page

MO1AA01

Upgrades and Developments at the ISIS Linac

rfq, linac, operation, quadrupole

1

A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The ISIS Spallation Neutron Source at the Rutherford Appleton Laboratory (RAL) in the UK has a 70 MeV H⁻ linac operating at 202.5 MHz. The linac consists of a 665 keV RFQ and a 4-tank Drift Tube Linac (DTL). In order to ensure continued reliability, increase performance and lay the groundwork for possible facility upgrades in the future a programme of R&D has been taking place in recent years. This paper will discuss three components of that programme: the complete replacement of DTL Tank 4; the design of a Medium Energy beam Transport (MEBT) between the RFQ and DTL; and the Front End Test Stand (FETS), a demonstrator for the front end of a future high current, high energy linac.

Slides MO1AA01 [26.001 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MO1AA01

About •

Received ※ 16 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 27 August 2022 — Issue date ※ 27 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MO1PA01

Beam Commissioning and Integrated Test of the PIP-II Injector Test Facility

cavity, MMI, cryomodule, operation

13

E. Pozdeyev, R. Andrews, C.M. Baffes, M. Ball, C. Boffo, R. Campos, J.-P. Carneiro, B.E. Chase, A.Z. Chen, D.J. Crawford, J. Czajkowski, N. Eddy, M. El Baz, M.G. Geelhoed, V.M. Grzelak, P.M. Hanlet, B.M. Hanna, B.J. Hansen, E.R. Harms, B.F. Harrison, M.A. Ibrahim, K.R. Kendziora, M.J. Kucera, D.D. Lambert, J.R. Leibfritz, P. Lyalyutskyy, J.N. Makara, H. Maniar, L. Merminga, R. Neswold, D.J. Nicklaus, J.P. Ozelis, D. Passarelli, N. Patel, D.W. Peterson, L.R. Prost, G.W. Saewert, A. Saini, V.E. Scarpine, A.V. Shemyakin, J. Steimel, A.I. Sukhanov, P. Varghese, R. Wang, A. Warner, G. Wu, R.M. Zifko
Fermilab, Batavia, Illinois, USA
V.K. Mishra, M.M. Pande, K. Singh, Vikas. Teotia
BARC, Mumbai, India

The PIP-II Injector Test (PIP2IT) facility is a near-complete low energy portion of the Superconducting PIP-II linac driver. PIP2IT comprises the warm front end and the first two PIP-II superconducting cryomodules. PIP2IT is designed to accelerate a 2 mA H⁻ beam to an energy of 20 MeV. The facility serves as a testbed for a number of advanced technologies required to operate PIP-II and provides an opportunity to gain experience with commissioning of the superconducting linac, significantly reducing project technical risks. Some PIP2IT components are contributions from international partners, who also lend their expertise to the accelerator project. The project has been successfully commissioned with the beam in 2021, demonstrating the performance required for the LBNF/DUNE. In this paper, we describe the facility and its critical systems. We discuss our experience with the integrated testing and beam commissioning of PIP2IT, and present commissioning results. This important milestone ushers in a new era at Fermilab of proton beam delivery using superconducting radio-frequency accelerators.

please see instructions how to view/control embeded videos

Slides MO1PA01 [2.714 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MO1PA01

About •

Received ※ 16 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 13 October 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPORI02

Implementation of an Advanced MicroTCA.4-based Digitizer for Monitoring Comb-Like Beam at the J-PARC Linac

linac, monitoring, DTL, operation

219

E. Cicek, K. Futatsukawa, T. Miyao, S. Mizobata
KEK, Ibaraki, Japan
N. Hayashi, A. Miura, K. Moriya
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

The Japan Proton Accelerator Research Complex (J-PARC) linac beam pulse, generated by a beam chopper system placed at the MEBT, comprises a series of intermediate pulses with a comb-like structure synchronized with the radio-frequency of the rapid cycling synchrotron (RCS). The sequentially measuring and monitoring the comb-like beam pulse ensures the beam stability with less beam loss at the current operation and higher beam intensity scenarios at the J-PARC. However, signal processing as a function of the pulse structure is challenging using a general-purpose digitizer, and monitoring the entire macro pulse during the beam operation is unavailable. To this end, an advanced beam monitor digitizer complying with the MicroTCA.4 (MicroTelecommunications Computing Architecture.4) standard, including digital signal processing functions, has been developed. This paper reports the implementation, performance evaluation, and the first results of this unique beam monitor digitizer.

Poster MOPORI02 [7.902 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPORI02

About •

Received ※ 13 August 2022 — Accepted ※ 22 August 2022 — Issue date ※ 01 September 2022

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TUPOJO11

Design of Beam Focusing System with Permanent Magnet for J-PARC LINAC MEBT1

octupole, linac, focusing, emittance

364

Y. Fuwa, K. Moriya, T. Takayanagi
JAEA/J-PARC, Tokai-mura, Japan

Space charge compensation technology using higher-order multipole magnetic field components has been proposed to transport high-intensity charged particle beams for J-PARC LINAC MEBT1. In order to realize this compensation technology in a limited beam line space, we devised a compact-size combined-function multipole permanent magnet. This magnet can produce two multipole components at the same location on the beam line. As a first step, we have designed a magnet to simultaneously generate a fixed-strength quadrupole and an adjustable-strength octupole component using permanent magnet materials. In this magnet model, the magnetic circuit consists of two groups of magnets.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO11

About •

Received ※ 20 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOJO13

Wire Scanner Systems at the European Spallation Source (ESS): Tests and First Beam Commissioning Results

detector, linac, MMI, controls

372

C.S. Derrez, I. Bustinduy, E.M. Donegani, V. Grishin, H. Kocevar, J.P.S. Martins, N. Milas, R. Miyamoto, T.J. Shea, R. Tarkeshian, C.A. Thomas, P.L. van Velze
ESS, Lund, Sweden
S. Cleva, R. De Monte, M. Ferianis, S. Grulja
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
I. Mazkiaran, A.R. Páramo
ESS Bilbao, Zamudio, Spain

The ESS beam instrumentation includes 3 different type of Wire Scanners (WS). Double wires systems are deployed in the MEBT part of NCL, and single wires and flying wire instruments are being tested and installed in the higher energy sections of the ESS linac. First beam tests result from the MEBT systems will be presented. The superconducting linac WS systems are based on scintillator detectors and wavelength shifting fibers are mounted on the beam pipe. The detectors are coupled to long haul optical fibers, which carry the signals to custom front end electronics sitting in controls racks at the surface. The acquisition chain have been characterized at IHEP (Protvino, Russia), ELETTRA (Trieste, Italy), CERN PSB, CoSy (IKP, Germany) and SNS (USA) before installation in the ESS tunnel. The test results of this system design, differing from the standard approach where photomultipliers are coupled to the scintillator will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO13

About •

Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 01 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOJO14

Status of Testing and Commissioning of the Medium Energy Beam Transport Line of the ESS Normal Conducting Linac

cavity, linac, MMI, quadrupole

376

A.G. Sosa, R.A. Baron, H. Danared, C.S. Derrez, E.M. Donegani, M. Eshraqi, V. Grishin, A. Jansson, M. Jensen, B. Jones, E. Laface, B. Lagoguez, Y. Levinsen, J.P.S. Martins, N. Milas, R. Miyamoto, D.J.P. Nicosia, D. Noll, D.C. Plostinar, T.J. Shea, R. Tarkeshian, C.A. Thomas, E. Trachanas, P.L. van Velze
ESS, Lund, Sweden
I. Bustinduy, A. Conde, D. Fernández-Cañoto, N. Garmendia, P.J. González, G. Harper, A. Kaftoosian, J. Martin, I. Mazkiaran, J.L. Muñoz, A.R. Páramo, S. Varnasseri, A.Z. Zugazaga
ESS Bilbao, Zamudio, Spain

The latest beam commissioning phase of the Normal Conducting Linac at ESS delivered a proton beam through the Medium Energy Beam Transport (MEBT) into the first Drift Tube Linac (DTL) tank. The probe beam in MEBT consisted of 3.6 MeV protons of <6 mA, <5 microseconds pulse length and 1 Hz repetition rate. Following the delivery of the components at ESS in Lund in June 2019, the commissioning phase with the MEBT was completed in July 2022. In March 2022, the maximum beam current of 62.5 mA was transported up to the MEBT Faraday cup. This proceeding focuses on the status of MEBT including magnets, buncher cavities, scrapers and beam diagnostics designed and tested in collaboration with ESS Bilbao.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO14

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Received ※ 13 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 01 September 2022

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TUPOJO21

The Pre-Injector Upgrade for the ISIS H⁻ Linac

ion-source, plasma, linac, MMI

398

S.R. Lawrie, R.E. Abel, C. Cahill, D.C. Faircloth, A.P. Letchford, J.H. Macgregor, S. Patel, T.M. Sarmento, J.D. Speed, O.A. Tarvainen, M. Whitehead, T. Wood
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

A new maintenance-free, high current, high duty-factor H⁻ linac pre-injector is being commissioned for the ISIS pulsed spallation neutron and muon facility. As well as delivering a low emittance-growth, loss-free beam, the pre-injector incorporates a chopper to facilitate arbitrary bunch time-structures. A 50 Hz, 0.9 ms (4.5% duty factor) RF-driven H⁻ ion source operates extremely reliably and with a large available parameter space via a novel microwave ignition gun and a wideband solid-state RF amplifier. A 202.5 MHz medium energy beam transport (MEBT) incorporates eight quadrupole magnets with integrated xy steerers, four quarter-wave re-bunching cavities, four extremely compact beam position monitors and an electrostatic chopper in just two metres of footprint. Beam has been extracted from the ion source and MEBT commissioning is due Spring 2023. Thereafter, the entire pre-injector will be soak-tested offline for a year before installing on the user facility.

Slides TUPOJO21 [1.784 MB]

Poster TUPOJO21 [3.053 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO21

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Received ※ 13 August 2022 — Revised ※ 16 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 05 September 2022

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TUPORI24

Beam Dynamics Studies at the PIP-II Injector Test Facility

cryomodule, rfq, emittance, solenoid

601

J.-P. Carneiro, B.M. Hanna, E. Pozdeyev, L.R. Prost, A. Saini, A.V. Shemyakin
Fermilab, Batavia, Illinois, USA

A series of beam dynamic studies were performed in 2020-2021 at the PIP-II Injector Test Facility (PIP2IT) that has been built to validate the concept of the front-end of the PIP-II linac being constructed at Fermilab. PIP2IT is comprised of a 30-keV H⁻ ion source, a 2 m-long Low Energy Beam Transport (LEBT), a 2.1- MeV CW RFQ, followed by a 10-m Medium Energy Beam Transport (MEBT), 2 cryomodules accelerating the beam to 16 MeV and a High-Energy Beam Transport (HEBT) bringing the beam to an absorber. This paper presents beam dynamics - related measurements performed at PIP2IT as the Twiss parameters with Allison scanners, beam envelopes along the injector, and transverse and longitudinal rms emittance reconstruction. These measurements are compared with predictions from the beam dynamics code Tracewin.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI24

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Received ※ 21 August 2022 — Revised ※ 25 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 15 September 2022

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TUPORI25

Finding Beam Loss Locations at PIP2IT Accelerator With Oscillating Dipole Correctors

dipole, cryomodule, linac, betatron

605

A.V. Shemyakin
Fermilab, Batavia, Illinois, USA

Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics
The PIP2IT accelerator was assembled in multiple stages in 2014 - 2021 to test concepts and components of the future PIP-II linac that is being constructed at Fermilab. In its final configuration, PIP2IT accelerated a 0.55 ms x 20 Hz x 2 mA H⁻ beam to 16 MeV. To determine location of the beam loss in the accelerator’s low-energy part, where radiation monitors are ineffective, a method using oscillating trajectories was implemented. If the beam is scraped at an aperture limitation, moving its centroid with two dipole correctors located upstream and oscillating in sync, produces a line at the corresponding frequency in spectra of BPM sum signals downstream of the loss point. Comparison of these responses along the beam line allows to find the loss location. The paper describes the method and results of its implementation at PIP2IT.

Slides TUPORI25 [0.447 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI25

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Received ※ 24 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 15 September 2022

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FR1AA04

SARAF Commissioning: Injector, MEBT and Chopper

rfq, emittance, diagnostics, MMI

872

J. Dumas, D. Chirpaz, D. Darde, J. Dumas, R.D. Duperrier, G. Ferrand, A. Gaget, F. Gohier, F. Gougnaud, T.J. Joannem, V. Nadot, N. Pichoff, F. Senée, C. Simon, D.U. Uriot, L. Zhao
CEA-IRFU, Gif-sur-Yvette, France
A. Chancé
CEA, Gif-sur-Yvette, France
S. Cohen, I.G. Gertz, N. Goldberger, H. Isakov, B. Kaizer, A. Kreisel, J. Luner, I. Mardor, H. Paami, A. Perry, I. Polikarpov, E. Reinfeld, J. Rodnitsky, I. Shmuely, A. Shor, Y. Solomon, N. Tamim, R. Weiss-Babai, L. Weissman, T. Zchut
Soreq NRC, Yavne, Israel
G. Desmarchelier, N. Solenne
CEA-DRF-IRFU, France

IAEC/SNRC (Israel) is constructing an accelerator fa-cility, SARAF, for neutron production. It is based on a linac accelerating 5 mA CW deuteron and proton beam up to 40 MeV. As a first phase, IAEC constructed and operated a linac (SARAF Phase I), from which remains an ECR ion source, a Low-Energy Beam Transport (LEBT) line and a 4-rod RFQ. Since 2015, IAEC and CEA (France) are collaborating in the second phase, consisting in manufacturing of the linac (Figure 1). The injector control-system has been recently updated and the Medium Energy Beam Transport (MEBT) line has been installed and integrated to the infrastructure. It has been partially commissioned during the first semester of 2022. This paper presents the results of the integration, tests and commissioning of the injector and MEBT, be-fore delivery of the cryomodules.

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Slides FR1AA04 [2.971 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-FR1AA04

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Received ※ 21 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 14 September 2022 — Issue date ※ 15 September 2022

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FR1AA05

Design Considerations for a Proton Linac for a Compact Accelerator Based Neutron Source

DTL, emittance, neutron, rfq

878

M. Abbaslou
UVIC, Victoria, Canada
A. Gottberg, O.K. Kester, R.E. Laxdal, M. Marchetto
TRIUMF, Vancouver, Canada
D.D. Maharaj, D. Marquardt
University of Windsor, Windsor, Ontario, Canada
S. Tabbassum
Purdue University, West Lafayette, Indiana, USA

New neutron sources are needed both for Canada and internationally as access to reactor based neutrons shrinks. Compact Accelerator-based Neutron Sources (CANS) offer the possibility of an intense source of pulsed neutrons with a capital cost significantly lower than spallation sources. In an effort to close the neutron gap in Canada a prototype, Canadian compact accelerator-based neutron source (PC-CANS) is proposed for installation at the University of Windsor. The PC-CANS is envisaged to serve two neutron science instruments, a boron neutron capture therapy (BNCT) station and a beamline for fluorine-18 radioisotope production for positron emission tomography (PET). To serve these diverse applications of neutron beams, a linear accelerator solution is selected, that will provide 10 MeV protons with a peak current of 10 mA within a 5% duty cycle. The accelerator is based on an RFQ and DTL with a post-DTL pulsed kicker system to simultaneously deliver macro-pulses to each end-station. Several choices of Linac technology are being considered and a comparison of the choices will be presented.

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Slides FR1AA05 [1.945 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-FR1AA05

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Received ※ 27 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 03 September 2022

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