LINAC2022 - List of Keywords (ion-source)

Paper	Title	Other Keywords	Page
MOPOGE18	Design of IH-DTL to Accelerate Intense Lithium-Ion Beam for Compact Neutron Source	neutron, DTL, linac, rfq	194
	S. Ikeda, T. Kanesue, M. Okamura BNL, Upton, New York, USA
	We are studying feasibility of a compact neutron source with a lithium-ion beam driver. The neutron source com-prises a laser ion source, an RFQ linac, and an IH-DTL. Recently, we demonstrated 35-mA 7Li³⁺ ion beam acceler-ation by an RFQ linac with a laser ion source. Based on the result, we performed beam dynamic design of an IH-DTL to accelerate the lithium-ion beam to the energy required for the neutron production, 14 MeV. To obtain a realistic field distribution, we made a rough model of the IH-DTL cavity with Microwave studio. It was confirmed with GPT 3D beam simulation that 1.7-m and 200-kW IH-DTL with two triplets can accelerate 30-mA 7Li³⁺ beam.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE18
About •	Received ※ 02 September 2022 — Revised ※ 05 September 2022 — Accepted ※ 09 September 2022 — Issue date ※ 13 October 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOJO08	Upgrade and Commissioning of the 60 keV Low Energy Beam Transport Line for the Frankfurt Neutron Source FRANZ	proton, rfq, MMI, LEBT	352
	H. Hähnel, A. Ateş, G. Blank, M.S. Breidt, D. Bänsch, R. Gössling, T. Metz, H. Podlech, U. Ratzinger, A. Rüffer, K. Volk, C. Wagner IAP, Frankfurt am Main, Germany R.H. Hollinger, C. Zhang GSI, Darmstadt, Germany H. Podlech HFHF, Frankfurt am Main, Germany
	The Low Energy Beam Transport line (LEBT) for the Frankfurt Neutron Source (FRANZ) has been redesigned to accommodate a 60 keV proton beam. Driven by a CHORDIS ion source, operating at 35 kV, a newly designed electrostatic postaccelerator has beeen installed to reach the desired beam energy of 60 keV. Additional upgrades to the beamline include two steerer pairs, several optical diagnostics sections and an additional faraday cup. We present the results of beam commissioning up to the point of RFQ injection. Emittance measurements were performed to prepare matching to the RFQ and improve the beam dynamics model of the low energy beamline. Due to the successful operation of the beamline at 60 keV, retrofitting of the RFQ for the new energy has been initiated.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO08
About •	Received ※ 22 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 05 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOJO10	Hardware Commissioning With Beam at the European Spallation Source: Ion Source to DTL1	MMI, DTL, linac, rfq	360
	B. Jones, R.A. Baron, C.S. Derrez, F. Grespan, V. Grishin, Y. Levinsen, N. Milas, R. Miyamoto, D.J.P. Nicosia, D. Noll, D.C. Plostinar, A.G. Sosa, E. Trachanas, R. Zeng ESS, Lund, Sweden C. Baltador, L. Bellan, M. Comunian, F. Grespan, A. Palmieri INFN/LNL, Legnaro (PD), Italy I. Bustinduy, N. Garmendia ESS Bilbao, Zamudio, Spain L. Neri INFN/LNS, Catania, Italy
	The European Spallation Source (ESS) aims to build and commission a 2 MW proton linac ready for neutron production in 2025. The normal conducting section of the ESS linac is designed to accelerate a 62.5 mA proton beam to 90 MeV at 14 Hz. The section consists of a microwave ion source, Radio Frequency Quadrupole (RFQ) and 5-tank Drift Tube Linac (DTL). All sections are provided to ESS by in-kind partners across Europe. This paper reports the recent progress on the assembly, installation, testing and commissioning of the ESS normal conducting linac.
	Slides TUPOJO10 [2.397 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO10
About •	Received ※ 12 August 2022 — Revised ※ 15 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 03 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	plasma, linac, MEBT, 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPORI02	New Injection Beamline for TRIUMF Cyclotron	injection, cyclotron, diagnostics, vacuum	545
	M. Marchetto, R.A. Baartman, Y. Bylinskii, P.E. Dirksen, M. Ilagan, P.M. Jung, O. Law, R.E. Laxdal, S. Saminathan, V.A. Verzilov, V. Zvyagintsev TRIUMF, Vancouver, Canada B. Dos Remedios UBC & TRIUMF, Vancouver, British Columbia, Canada
	The TRIUMF Ion Source and Injection System (ISIS) beamline is used to transport the 300 keV H⁻ beam from the ion source to the injection into the 500 MeV cyclotron. The vertical section of the beamline, upgraded in 2011, is very robust and reliable, while the horizontal section, now 50 years old, is very demanding in maintenance, and presents a high risk of downtime due to aging. The horizontal beamline is being re-designed with well proven optical concepts, and modern UHV technologies already used in the vertical section, and in the ARIEL RIB transport system; this will produce a more efficient system, easier to maintain and tune. The beamline will use electrostatic optical modules like matching, periodic, and 90-degree achromatic bend sections; updated elements include bunchers, a high-energy pulser, a 5:1 selector, and a new set of diagnostics. A crucial aspect of the new beamline is a magnetic shield, to compensate the cyclotron stray field, comprised of a mu-metal in-vacuum liner allowing HV feedthroughs and diagnostics insertion without breaking the shield continuity. The new injection beamline will be controlled via EPICS. The paper will present the status of the project.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI02
About •	Received ※ 23 August 2022 — Revised ※ 30 August 2022 — Accepted ※ 03 September 2022 — Issue date ※ 15 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPORI23	Investigation of the Beam Propagation Through the FNAL LEBT	LEBT, linac, emittance, rfq	597
	D.C. Jones, D.S. Bollinger, V.V. Kapin, K. Seiya Fermilab, Batavia, Illinois, USA
	Fermilab Preaccelerator sends 25 mA H⁻ beam with a 30 µs pulse length at 15 Hz. The machine’s uptime was increased in 2012 by the replacement of the Cockcroft Walton accelerator with an RFQ system to take the beam from 35 keV to 750 keV; however, this came with a reduction in transmitted beam between the source and the entrance to Tank 1 of the LINAC. Fermilab currently operates with less than 50% of the beam current from the ion source making it to the entrance of tank 1. In an effort to understand the causes of this reduction in transmission efficiency a vertically movable paddle was installed between the first two solenoids allowing the beam size to be investigated before entering the RFQ. Comparing this data to the emittance measurements done after the first solenoid in the Ion Source R&D lab a more complete picture of the beams propagation through the LEBT has begun to be established when compared with the simulation results. We will present these results here.
	Poster TUPORI23 [0.510 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI23
About •	Received ※ 14 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 15 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPORI28	Injector System Development for 1 MeV/n RFQ at KOMAC	rfq, proton, extraction, solenoid	615
	H.S. Kim KAERI, Daejon, Republic of Korea J.J. Dang, D.-H. Kim, H.-J. Kwon, S. Lee, S.P. Yun KOMAC, KAERI, Gyeongju, Republic of Korea
	Funding: This work has been supported through the KOMAC operation fund of KAERI by the Korean government (MSIT). A Radiofrequency quadrupole (RFQ) system with 200 MHz frequency and 1 MeV/n output energy is under development at KOMAC (Korea Multi-purpose Accelerator Complex) for multiple purposes such as a test-stand for an ion source and low energy beam transport study, ion beam implantation for semiconductors and polymers and neutron generation for material study. We developed an injector system for the RFQ, which is mainly composed of a 2.45 GHz microwave ion source, low energy beam transport with two solenoids, and a vacuum system with a diagnostic chamber. The RFQ was designed to be able to accelerate the beam with 2.5 mass-to-charge ratios (A/q) but we used the proton beam for an initial test to characterize the injector system. A Detailed describtion of the constructed injector system along with test results will be given in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI28
About •	Received ※ 22 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 15 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPORI29	Space Charge and Electron Confinement in High Current Low Energy Transport Lines: Experience and Simulations From IFMIF/EVEDA and ESS Commissioning	rfq, electron, LEBT, extraction	618
	L. Bellan, M. Comunian, F. Grespan, A. Pisent INFN/LNL, Legnaro (PD), Italy E.M. Donegani, M. Eshraqi, F. Grespan, B. Jones, E. Laface, Y. Levinsen, N. Milas, R. Miyamoto, D. Noll, D.C. Plostinar, A.G. Sosa ESS, Lund, Sweden L. Neri INFN/LNS, Catania, Italy
	The mechanism of space charge compensation given by the residual gas ionization is a key factor for the emittance containment in the low energy beam transport (LEBT) lines of high intensity hadron injectors. A typical front end including a microwave Ion source, a LEBT and Radio Frequency Quadrupole (RFQ), is equipped with two repellers at each interface to prevent electrons from flowing back, to the source, or forward, to the RFQ. In this paper we will emphasize the importance of the ion Source and LEBT repellers on giving the appropriate boundary conditions for the space-charge compensation building-up mechanism. The theory and simulations are supported by experiments performed in the high intensity facility such as ESS and IFMIF/EVEDA.
	Slides TUPORI29 [1.633 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI29
About •	Received ※ 23 August 2022 — Revised ※ 03 September 2022 — Accepted ※ 06 September 2022 — Issue date ※ 15 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPORI19	HSMDIS Performance on the ESS Ion Source	MMI, linac, plasma, LEBT	863
	L. Neri, G. Castro, L. Celona, S. Gammino, O. Leonardi, A. Miraglia INFN/LNS, Catania, Italy C. Baltador, L. Bellan, M. Comunian, F. Grespan INFN/LNL, Legnaro (PD), Italy B. Jones, E. Laface, R. Miyamoto, A.G. Sosa ESS, Lund, Sweden
	The ESS ion source, developed at INFN-LNS and installed at the ESS facility, is fully working and in operation for the linac beam commissioning. The commissioning of the source was done in Catania and in Lund showing high reproducibility related to the beam diagnostic parameters that can be measured with the subset of equipment currently available in Lund. The analysis of the data collected during the commissioning in Catania discloses the possibility to use a new source configuration named High Stability Microwave Discharge Ion Source (HSMDIS), able to improve beam stability and lower the beam emittance. This paper shows the capability to increase the beam current intensity, with preserving beam stability, by changing only the microwave power. Linearity was tested from 10 to 120 mA to be able to provide the lower values needed for the different phases of the accelerator commissioning and higher values for future accelerator development. The source stability is evaluated through intra-pulse stability and pulse-to-pulse stability. Reference: L. Neri, L. Celona "High stability microwave discharge ion sources" Sci Rep 12, 3064 (2022). https://doi.org/10.1038/s41598-022-06937-7
	Slides THPORI19 [37.408 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPORI19
About •	Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 16 September 2022
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Paper

Title

Other Keywords

Page

MOPOGE18

Design of IH-DTL to Accelerate Intense Lithium-Ion Beam for Compact Neutron Source

neutron, DTL, linac, rfq

194

S. Ikeda, T. Kanesue, M. Okamura
BNL, Upton, New York, USA

We are studying feasibility of a compact neutron source with a lithium-ion beam driver. The neutron source com-prises a laser ion source, an RFQ linac, and an IH-DTL. Recently, we demonstrated 35-mA 7Li³⁺ ion beam acceler-ation by an RFQ linac with a laser ion source. Based on the result, we performed beam dynamic design of an IH-DTL to accelerate the lithium-ion beam to the energy required for the neutron production, 14 MeV. To obtain a realistic field distribution, we made a rough model of the IH-DTL cavity with Microwave studio. It was confirmed with GPT 3D beam simulation that 1.7-m and 200-kW IH-DTL with two triplets can accelerate 30-mA 7Li³⁺ beam.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE18

About •

Received ※ 02 September 2022 — Revised ※ 05 September 2022 — Accepted ※ 09 September 2022 — Issue date ※ 13 October 2022

Cite •

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

TUPOJO08

Upgrade and Commissioning of the 60 keV Low Energy Beam Transport Line for the Frankfurt Neutron Source FRANZ

proton, rfq, MMI, LEBT

352

H. Hähnel, A. Ateş, G. Blank, M.S. Breidt, D. Bänsch, R. Gössling, T. Metz, H. Podlech, U. Ratzinger, A. Rüffer, K. Volk, C. Wagner
IAP, Frankfurt am Main, Germany
R.H. Hollinger, C. Zhang
GSI, Darmstadt, Germany
H. Podlech
HFHF, Frankfurt am Main, Germany

The Low Energy Beam Transport line (LEBT) for the Frankfurt Neutron Source (FRANZ) has been redesigned to accommodate a 60 keV proton beam. Driven by a CHORDIS ion source, operating at 35 kV, a newly designed electrostatic postaccelerator has beeen installed to reach the desired beam energy of 60 keV. Additional upgrades to the beamline include two steerer pairs, several optical diagnostics sections and an additional faraday cup. We present the results of beam commissioning up to the point of RFQ injection. Emittance measurements were performed to prepare matching to the RFQ and improve the beam dynamics model of the low energy beamline. Due to the successful operation of the beamline at 60 keV, retrofitting of the RFQ for the new energy has been initiated.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO08

About •

Received ※ 22 August 2022 — Revised ※ 28 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 05 September 2022

Cite •

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

TUPOJO10

Hardware Commissioning With Beam at the European Spallation Source: Ion Source to DTL1

MMI, DTL, linac, rfq

360

B. Jones, R.A. Baron, C.S. Derrez, F. Grespan, V. Grishin, Y. Levinsen, N. Milas, R. Miyamoto, D.J.P. Nicosia, D. Noll, D.C. Plostinar, A.G. Sosa, E. Trachanas, R. Zeng
ESS, Lund, Sweden
C. Baltador, L. Bellan, M. Comunian, F. Grespan, A. Palmieri
INFN/LNL, Legnaro (PD), Italy
I. Bustinduy, N. Garmendia
ESS Bilbao, Zamudio, Spain
L. Neri
INFN/LNS, Catania, Italy

The European Spallation Source (ESS) aims to build and commission a 2 MW proton linac ready for neutron production in 2025. The normal conducting section of the ESS linac is designed to accelerate a 62.5 mA proton beam to 90 MeV at 14 Hz. The section consists of a microwave ion source, Radio Frequency Quadrupole (RFQ) and 5-tank Drift Tube Linac (DTL). All sections are provided to ESS by in-kind partners across Europe. This paper reports the recent progress on the assembly, installation, testing and commissioning of the ESS normal conducting linac.

Slides TUPOJO10 [2.397 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO10

About •

Received ※ 12 August 2022 — Revised ※ 15 August 2022 — Accepted ※ 28 August 2022 — Issue date ※ 03 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

plasma, linac, MEBT, 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

Cite •

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

TUPORI02

New Injection Beamline for TRIUMF Cyclotron

injection, cyclotron, diagnostics, vacuum

545

M. Marchetto, R.A. Baartman, Y. Bylinskii, P.E. Dirksen, M. Ilagan, P.M. Jung, O. Law, R.E. Laxdal, S. Saminathan, V.A. Verzilov, V. Zvyagintsev
TRIUMF, Vancouver, Canada
B. Dos Remedios
UBC & TRIUMF, Vancouver, British Columbia, Canada

The TRIUMF Ion Source and Injection System (ISIS) beamline is used to transport the 300 keV H⁻ beam from the ion source to the injection into the 500 MeV cyclotron. The vertical section of the beamline, upgraded in 2011, is very robust and reliable, while the horizontal section, now 50 years old, is very demanding in maintenance, and presents a high risk of downtime due to aging. The horizontal beamline is being re-designed with well proven optical concepts, and modern UHV technologies already used in the vertical section, and in the ARIEL RIB transport system; this will produce a more efficient system, easier to maintain and tune. The beamline will use electrostatic optical modules like matching, periodic, and 90-degree achromatic bend sections; updated elements include bunchers, a high-energy pulser, a 5:1 selector, and a new set of diagnostics. A crucial aspect of the new beamline is a magnetic shield, to compensate the cyclotron stray field, comprised of a mu-metal in-vacuum liner allowing HV feedthroughs and diagnostics insertion without breaking the shield continuity. The new injection beamline will be controlled via EPICS. The paper will present the status of the project.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI02

About •

Received ※ 23 August 2022 — Revised ※ 30 August 2022 — Accepted ※ 03 September 2022 — Issue date ※ 15 September 2022

Cite •

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

TUPORI23

Investigation of the Beam Propagation Through the FNAL LEBT

LEBT, linac, emittance, rfq

597

D.C. Jones, D.S. Bollinger, V.V. Kapin, K. Seiya
Fermilab, Batavia, Illinois, USA

Fermilab Preaccelerator sends 25 mA H⁻ beam with a 30 µs pulse length at 15 Hz. The machine’s uptime was increased in 2012 by the replacement of the Cockcroft Walton accelerator with an RFQ system to take the beam from 35 keV to 750 keV; however, this came with a reduction in transmitted beam between the source and the entrance to Tank 1 of the LINAC. Fermilab currently operates with less than 50% of the beam current from the ion source making it to the entrance of tank 1. In an effort to understand the causes of this reduction in transmission efficiency a vertically movable paddle was installed between the first two solenoids allowing the beam size to be investigated before entering the RFQ. Comparing this data to the emittance measurements done after the first solenoid in the Ion Source R&D lab a more complete picture of the beams propagation through the LEBT has begun to be established when compared with the simulation results. We will present these results here.

Poster TUPORI23 [0.510 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI23

About •

Received ※ 14 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 15 September 2022

Cite •

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

TUPORI28

Injector System Development for 1 MeV/n RFQ at KOMAC

rfq, proton, extraction, solenoid

615

H.S. Kim
KAERI, Daejon, Republic of Korea
J.J. Dang, D.-H. Kim, H.-J. Kwon, S. Lee, S.P. Yun
KOMAC, KAERI, Gyeongju, Republic of Korea

Funding: This work has been supported through the KOMAC operation fund of KAERI by the Korean government (MSIT).
A Radiofrequency quadrupole (RFQ) system with 200 MHz frequency and 1 MeV/n output energy is under development at KOMAC (Korea Multi-purpose Accelerator Complex) for multiple purposes such as a test-stand for an ion source and low energy beam transport study, ion beam implantation for semiconductors and polymers and neutron generation for material study. We developed an injector system for the RFQ, which is mainly composed of a 2.45 GHz microwave ion source, low energy beam transport with two solenoids, and a vacuum system with a diagnostic chamber. The RFQ was designed to be able to accelerate the beam with 2.5 mass-to-charge ratios (A/q) but we used the proton beam for an initial test to characterize the injector system. A Detailed describtion of the constructed injector system along with test results will be given in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI28

About •

Received ※ 22 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 15 September 2022

Cite •

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

TUPORI29

Space Charge and Electron Confinement in High Current Low Energy Transport Lines: Experience and Simulations From IFMIF/EVEDA and ESS Commissioning

rfq, electron, LEBT, extraction

618

L. Bellan, M. Comunian, F. Grespan, A. Pisent
INFN/LNL, Legnaro (PD), Italy
E.M. Donegani, M. Eshraqi, F. Grespan, B. Jones, E. Laface, Y. Levinsen, N. Milas, R. Miyamoto, D. Noll, D.C. Plostinar, A.G. Sosa
ESS, Lund, Sweden
L. Neri
INFN/LNS, Catania, Italy

The mechanism of space charge compensation given by the residual gas ionization is a key factor for the emittance containment in the low energy beam transport (LEBT) lines of high intensity hadron injectors. A typical front end including a microwave Ion source, a LEBT and Radio Frequency Quadrupole (RFQ), is equipped with two repellers at each interface to prevent electrons from flowing back, to the source, or forward, to the RFQ. In this paper we will emphasize the importance of the ion Source and LEBT repellers on giving the appropriate boundary conditions for the space-charge compensation building-up mechanism. The theory and simulations are supported by experiments performed in the high intensity facility such as ESS and IFMIF/EVEDA.

Slides TUPORI29 [1.633 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI29

About •

Received ※ 23 August 2022 — Revised ※ 03 September 2022 — Accepted ※ 06 September 2022 — Issue date ※ 15 September 2022

Cite •

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

THPORI19

HSMDIS Performance on the ESS Ion Source

MMI, linac, plasma, LEBT

863

L. Neri, G. Castro, L. Celona, S. Gammino, O. Leonardi, A. Miraglia
INFN/LNS, Catania, Italy
C. Baltador, L. Bellan, M. Comunian, F. Grespan
INFN/LNL, Legnaro (PD), Italy
B. Jones, E. Laface, R. Miyamoto, A.G. Sosa
ESS, Lund, Sweden

The ESS ion source, developed at INFN-LNS and installed at the ESS facility, is fully working and in operation for the linac beam commissioning. The commissioning of the source was done in Catania and in Lund showing high reproducibility related to the beam diagnostic parameters that can be measured with the subset of equipment currently available in Lund. The analysis of the data collected during the commissioning in Catania discloses the possibility to use a new source configuration named High Stability Microwave Discharge Ion Source (HSMDIS), able to improve beam stability and lower the beam emittance. This paper shows the capability to increase the beam current intensity, with preserving beam stability, by changing only the microwave power. Linearity was tested from 10 to 120 mA to be able to provide the lower values needed for the different phases of the accelerator commissioning and higher values for future accelerator development. The source stability is evaluated through intra-pulse stability and pulse-to-pulse stability.
Reference:
L. Neri, L. Celona "High stability microwave discharge ion sources" Sci Rep 12, 3064 (2022). https://doi.org/10.1038/s41598-022-06937-7

Slides THPORI19 [37.408 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPORI19

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Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 16 September 2022

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