LINAC2022 - Classification: Proton and Ion Accelerators and Applications / Superconducting structures

Paper	Title	Page
MOPOGE14	Current Status of the Spoke Cavity Prototyping for the JAEA-ADS Linac	180
	J. Tamura, Y. Kondo, F. Maekawa, S.I. Meigo, B. Yee-Rendón JAEA/J-PARC, Tokai-mura, Japan T. Dohmae, E. Kako, H. Sakai, K. Umemori KEK, Ibaraki, Japan
	The Japan Atomic Energy Agency (JAEA) has proposed an accelerator-driven subcritical system (ADS) to efficiently reduce high-level radioactive waste generated at nuclear power plants. One of the challenging R&D aspects of ADS is the reliability of the accelerator. In preparation for the full-scale design of the CW proton linac for the JAEA-ADS, we are now prototyping a low-beta (around 0.2) single spoke cavity. Since there is no experience in Japan in manufacturing a superconducting spoke cavity, prototyping and performance testing of the cavity is essential to ensure the feasibility of the JAEA-ADS linac. In the Japanese fiscal year 2021, we have started welding cavity parts together. By preliminarily examining the electron beam welding conditions, each press-formed niobium part was joined with a smooth welding bead. The current status of the spoke cavity prototyping for the JAEA-ADS linac is presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE14
About •	Received ※ 01 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 14 September 2022 — Issue date ※ 26 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPOGE19	Preliminary Study on the Cryogenic Control System Within RF Superconductive Linac Projects	197
	H. Sibileau, M.L. Beniken ACS, Orsay, France T. Junquera Accelerators and Cryogenic Systems, Orsay, France D. Masson ISII-TECH, Saint-Etienne-du-Rouvray, France
	Several RF Superconductive LINAC projects are underway in different laboratories around the world, with various objectives such as research in physics, irradiation tests, production of radioisotopes for medical purposes. Superconducting operation of the accelerating cavities requires them to be maintained at cryogenic temperatures (2K - 4K) by the use of cryogenic fluids. This requires a complete cryogenic control system, including sensors, actuators, local controllers and PLCs. We describe the process by which the preliminary design of the cryogenic control system for the accelerator’s cryomodules and valve boxes may be built. It starts with the functional and performance requirements of the system, followed by the definition of use cases and the study of the necessary cryogenic instrumentation. This leads to a preliminary design of the architecture of the cryogenic control system using Siemens hardware, as well as cryogenic sequences describing standard phases of operation of the LINAC. We also discuss how to take advantage of the modularity of cryomodules for control system implementation and some recent developments in PLC simulation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE19
About •	Received ※ 24 August 2022 — Revised ※ 01 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 16 October 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPOGE21	A Superconducting 217 MHz Single Spoke Cavity for the Helmholtz Linear Accelerator at GSI	200
	F.D. Dziuba, K. Aulenbacher, W.A. Barth, V. Gettmann, T. Kürzeder, J. List, M. Miski-Oglu HIM, Mainz, Germany K. Aulenbacher, W.A. Barth, F.D. Dziuba KPH, Mainz, Germany K. Aulenbacher, W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, V. Gettmann, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu, S. Yaramyshev GSI, Darmstadt, Germany T. Conrad, H. Podlech, M. Schwarz IAP, Frankfurt am Main, Germany
	Funding: Work supported by GSI, HIM, BMBF Contr. No. 05P18UMRB2 A new superconducting (SC) continuous wave (CW) linac, providing high efficient heavy ion acceleration above the coulomb barrier, is going to be built at GSI to fulfill the upcoming demands in the research field of super heavy element (SHE) synthesis. The so called HELIAC (HElmholtz LInear ACcelerator) delivers ion beams in the energy range of 3.5 MeV/u and 7.3 MeV/u with a mass to charge ratio (A/z) of up to 6. Superconducting multi-gap crossbar-H-mode (CH) cavities with a resonance frequency of 217 MHz are used for beam acceleration. In addition, SC single spoke buncher cavities should ensure longitudinal beam matching to the corresponding CH sections. Therefore, the first 217 MHz single spoke cavity with beta 0.07 has been developed at HIM/GSI and built at an industrial partner. In this paper the design of the cavity and first RF measurements during manufacturing are presented.
	Poster MOPOGE21 [2.619 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE21
About •	Received ※ 18 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 27 August 2022 — Issue date ※ 31 August 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPOGE23	Conservation of Quality Factor for Superconducting Cavity and Heartbeat under Relativistic Motion	204
	H. Kim IBS, Daejeon, Republic of Korea
	Funding: This research was supported by the Rare Isotope Science Project of Institute for Basic Science funded by Ministry of Science and National Research Foundation of Korea (NRF-2013M7A1A1075764). The conservation of quality factor under relativistic motion is applied to the superconducting cavity as well as the heartbeat of mammal. The quality factor of the superconducting cavity is conserved under relativistic motion. The frequency of the cavity decreases and the decay time increases as the velocity and acceleration are increased. The quality factor of the superconducting cavity is comparable with the total heartbeat of the mammal. The quality factor for the heartbeat of the mammal representing the total number of heartbeat is also conserved under relativistic motion. Therefore, the heart rate is inversely proportional to the life expectancy under relativistic motion.
	Poster MOPOGE23 [0.765 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE23
About •	Received ※ 25 July 2022 — Revised ※ 23 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPOGE24	Understanding Q Slope of Superconducting Cavity with Magnetic Defect and Field Emission	208
MOOPA07	use link to see paper's listing under its alternate paper code
	H. Kim, Y. Jung, H. Kim, J.W. Kim IBS, Daejeon, Republic of Korea S. Jeon Kyungpook National University, Daegu, Republic of Korea
	Funding: This research was supported by the RISP of ibs funded by the Ministry of Science and the National Research Foundation (NRF) of the Republic of Korea under Contract 2013M7A1A1075764. RF test for quarter-wave resonator (QWR) and half-wave resonator (HWR) superconducting cavities is performed at low temperature. The quality factors of the superconducting cavities are measured as a function of accelerating field. The magnetic heating effect for the quarter-wave resonator (QWR) is studied. For the half-wave resonator (HWR), the Q slope degradation is investigated with x-ray radiation and field emission.
	Slides MOPOGE24 [2.506 MB]
	Poster MOPOGE24 [1.174 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE24
About •	Received ※ 25 July 2022 — Revised ※ 18 August 2022 — Accepted ※ 23 August 2022 — Issue date ※ 12 October 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPOGE25	Rf Measurement and Characterisation of European Spallation Source Cavities at UKRI-STFC Daresbury Laboratory and DESY	212
	P.A. Smith, A.E.T. Akintola, K.D. Dumbell, M.J. Ellis, S. Hitchen, P.C. Hornickel, C.R. Jenkins, A.J. May, P.A. McIntosh, K.J. Middleman, A.J. Moss, S.M. Pattalwar, M.D. Pendleton, J.O.W. Poynton, A.E. Wheelhouse, S. Wilde STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom G. Jones, M. Lowe, D.A. Mason, G. Miller, J. Mutch, A. Oates, J.T.G. Wilson STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom K.J. Middleman Cockcroft Institute, Warrington, Cheshire, United Kingdom D. Reschke, L. Steder, M. Wiencek DESY, Hamburg, Germany
	The Accelerator Science and Technology Centre (ASTeC) is responsible for delivering 88 High Beta (HB) cavities as part of the European Spallation Source (ESS) facility in Sweden. The bulk Niobium Superconducting Radio Frequency (SRF) cavities operate at 704 MHz. They have been fabricated in industry and are currently being tested at Daresbury Laboratory and Deutsches Elektronen-Synchrotron (DESY). They will then be delivered to Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA) Saclay, France for integration into cryomodules. To date 50 cavities have been conditioned and evaluated and 36 cavities have been delivered to CEA. This paper discusses the experiences and testing of the cavities performed to date at both sites
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE25
About •	Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 04 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FR1AA02	CSNS-II Superconducting Linac Design
	J. Peng IHEP CSNS, Guangdong Province, People’s Republic of China
	This paper presents the physics design of the superconducting linac for CSNS-II project which starts in this year. In the CSNS upgrade project, the linac energy will be incresed to 300MeV from 80MeV with both 324MHz spoke cavities and 648MHz ellipse cavities. It will be the first superconducting H⁻ linac as a RCS injector. It is required to keep a high stability of the injection beam energy.

	please see instructions how to view/control embeded videos
	Slides FR1AA02 [2.179 MB]
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FR1AA06	Fully Automated Tuning and Recover of a High Power SCL	884
	A.P. Shishlo ORNL, Oak Ridge, Tennessee, USA C.C. Peters ORNL RAD, Oak Ridge, Tennessee, USA
	Funding: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. Techniques have been developed for fast (less than one hour), fully automated tune-up a high power proton SCL, as well as fully automated recovery from a cavity failure with no human intervention. These methods have been developed and demonstrated at the SNS SCL but are applicable to hadron SCL operation in general and will be especially relevant to future ADS applications

	please see instructions how to view/control embeded videos
	Slides FR1AA06 [1.112 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-FR1AA06
About •	Received ※ 23 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 04 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Current Status of the Spoke Cavity Prototyping for the JAEA-ADS Linac

180

J. Tamura, Y. Kondo, F. Maekawa, S.I. Meigo, B. Yee-Rendón
JAEA/J-PARC, Tokai-mura, Japan
T. Dohmae, E. Kako, H. Sakai, K. Umemori
KEK, Ibaraki, Japan

The Japan Atomic Energy Agency (JAEA) has proposed an accelerator-driven subcritical system (ADS) to efficiently reduce high-level radioactive waste generated at nuclear power plants. One of the challenging R&D aspects of ADS is the reliability of the accelerator. In preparation for the full-scale design of the CW proton linac for the JAEA-ADS, we are now prototyping a low-beta (around 0.2) single spoke cavity. Since there is no experience in Japan in manufacturing a superconducting spoke cavity, prototyping and performance testing of the cavity is essential to ensure the feasibility of the JAEA-ADS linac. In the Japanese fiscal year 2021, we have started welding cavity parts together. By preliminarily examining the electron beam welding conditions, each press-formed niobium part was joined with a smooth welding bead. The current status of the spoke cavity prototyping for the JAEA-ADS linac is presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE14

About •

Received ※ 01 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 14 September 2022 — Issue date ※ 26 September 2022

Cite •

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

MOPOGE19

Preliminary Study on the Cryogenic Control System Within RF Superconductive Linac Projects

197

H. Sibileau, M.L. Beniken
ACS, Orsay, France
T. Junquera
Accelerators and Cryogenic Systems, Orsay, France
D. Masson
ISII-TECH, Saint-Etienne-du-Rouvray, France

Several RF Superconductive LINAC projects are underway in different laboratories around the world, with various objectives such as research in physics, irradiation tests, production of radioisotopes for medical purposes. Superconducting operation of the accelerating cavities requires them to be maintained at cryogenic temperatures (2K - 4K) by the use of cryogenic fluids. This requires a complete cryogenic control system, including sensors, actuators, local controllers and PLCs. We describe the process by which the preliminary design of the cryogenic control system for the accelerator’s cryomodules and valve boxes may be built. It starts with the functional and performance requirements of the system, followed by the definition of use cases and the study of the necessary cryogenic instrumentation. This leads to a preliminary design of the architecture of the cryogenic control system using Siemens hardware, as well as cryogenic sequences describing standard phases of operation of the LINAC. We also discuss how to take advantage of the modularity of cryomodules for control system implementation and some recent developments in PLC simulation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE19

About •

Received ※ 24 August 2022 — Revised ※ 01 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 16 October 2022

Cite •

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

MOPOGE21

A Superconducting 217 MHz Single Spoke Cavity for the Helmholtz Linear Accelerator at GSI

200

F.D. Dziuba, K. Aulenbacher, W.A. Barth, V. Gettmann, T. Kürzeder, J. List, M. Miski-Oglu
HIM, Mainz, Germany
K. Aulenbacher, W.A. Barth, F.D. Dziuba
KPH, Mainz, Germany
K. Aulenbacher, W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, V. Gettmann, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu, S. Yaramyshev
GSI, Darmstadt, Germany
T. Conrad, H. Podlech, M. Schwarz
IAP, Frankfurt am Main, Germany

Funding: Work supported by GSI, HIM, BMBF Contr. No. 05P18UMRB2
A new superconducting (SC) continuous wave (CW) linac, providing high efficient heavy ion acceleration above the coulomb barrier, is going to be built at GSI to fulfill the upcoming demands in the research field of super heavy element (SHE) synthesis. The so called HELIAC (HElmholtz LInear ACcelerator) delivers ion beams in the energy range of 3.5 MeV/u and 7.3 MeV/u with a mass to charge ratio (A/z) of up to 6. Superconducting multi-gap crossbar-H-mode (CH) cavities with a resonance frequency of 217 MHz are used for beam acceleration. In addition, SC single spoke buncher cavities should ensure longitudinal beam matching to the corresponding CH sections. Therefore, the first 217 MHz single spoke cavity with beta 0.07 has been developed at HIM/GSI and built at an industrial partner. In this paper the design of the cavity and first RF measurements during manufacturing are presented.

Poster MOPOGE21 [2.619 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE21

About •

Received ※ 18 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 27 August 2022 — Issue date ※ 31 August 2022

Cite •

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

MOPOGE23

Conservation of Quality Factor for Superconducting Cavity and Heartbeat under Relativistic Motion

204

H. Kim
IBS, Daejeon, Republic of Korea

Funding: This research was supported by the Rare Isotope Science Project of Institute for Basic Science funded by Ministry of Science and National Research Foundation of Korea (NRF-2013M7A1A1075764).
The conservation of quality factor under relativistic motion is applied to the superconducting cavity as well as the heartbeat of mammal. The quality factor of the superconducting cavity is conserved under relativistic motion. The frequency of the cavity decreases and the decay time increases as the velocity and acceleration are increased. The quality factor of the superconducting cavity is comparable with the total heartbeat of the mammal. The quality factor for the heartbeat of the mammal representing the total number of heartbeat is also conserved under relativistic motion. Therefore, the heart rate is inversely proportional to the life expectancy under relativistic motion.

Poster MOPOGE23 [0.765 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE23

About •

Received ※ 25 July 2022 — Revised ※ 23 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022

Cite •

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

MOPOGE24

Understanding Q Slope of Superconducting Cavity with Magnetic Defect and Field Emission

208

MOOPA07

use link to see paper's listing under its alternate paper code

H. Kim, Y. Jung, H. Kim, J.W. Kim
IBS, Daejeon, Republic of Korea
S. Jeon
Kyungpook National University, Daegu, Republic of Korea

Funding: This research was supported by the RISP of ibs funded by the Ministry of Science and the National Research Foundation (NRF) of the Republic of Korea under Contract 2013M7A1A1075764.
RF test for quarter-wave resonator (QWR) and half-wave resonator (HWR) superconducting cavities is performed at low temperature. The quality factors of the superconducting cavities are measured as a function of accelerating field. The magnetic heating effect for the quarter-wave resonator (QWR) is studied. For the half-wave resonator (HWR), the Q slope degradation is investigated with x-ray radiation and field emission.

Slides MOPOGE24 [2.506 MB]

Poster MOPOGE24 [1.174 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE24

About •

Received ※ 25 July 2022 — Revised ※ 18 August 2022 — Accepted ※ 23 August 2022 — Issue date ※ 12 October 2022

Cite •

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

MOPOGE25

Rf Measurement and Characterisation of European Spallation Source Cavities at UKRI-STFC Daresbury Laboratory and DESY

212

P.A. Smith, A.E.T. Akintola, K.D. Dumbell, M.J. Ellis, S. Hitchen, P.C. Hornickel, C.R. Jenkins, A.J. May, P.A. McIntosh, K.J. Middleman, A.J. Moss, S.M. Pattalwar, M.D. Pendleton, J.O.W. Poynton, A.E. Wheelhouse, S. Wilde
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
G. Jones, M. Lowe, D.A. Mason, G. Miller, J. Mutch, A. Oates, J.T.G. Wilson
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
K.J. Middleman
Cockcroft Institute, Warrington, Cheshire, United Kingdom
D. Reschke, L. Steder, M. Wiencek
DESY, Hamburg, Germany

The Accelerator Science and Technology Centre (ASTeC) is responsible for delivering 88 High Beta (HB) cavities as part of the European Spallation Source (ESS) facility in Sweden. The bulk Niobium Superconducting Radio Frequency (SRF) cavities operate at 704 MHz. They have been fabricated in industry and are currently being tested at Daresbury Laboratory and Deutsches Elektronen-Synchrotron (DESY). They will then be delivered to Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA) Saclay, France for integration into cryomodules. To date 50 cavities have been conditioned and evaluated and 36 cavities have been delivered to CEA. This paper discusses the experiences and testing of the cavities performed to date at both sites

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE25

About •

Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 04 September 2022

Cite •

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

FR1AA02

CSNS-II Superconducting Linac Design

J. Peng
IHEP CSNS, Guangdong Province, People’s Republic of China

This paper presents the physics design of the superconducting linac for CSNS-II project which starts in this year. In the CSNS upgrade project, the linac energy will be incresed to 300MeV from 80MeV with both 324MHz spoke cavities and 648MHz ellipse cavities. It will be the first superconducting H⁻ linac as a RCS injector. It is required to keep a high stability of the injection beam energy.

please see instructions how to view/control embeded videos

Slides FR1AA02 [2.179 MB]

Cite •

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

FR1AA06

Fully Automated Tuning and Recover of a High Power SCL

884

A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA
C.C. Peters
ORNL RAD, Oak Ridge, Tennessee, USA

Funding: This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.
Techniques have been developed for fast (less than one hour), fully automated tune-up a high power proton SCL, as well as fully automated recovery from a cavity failure with no human intervention. These methods have been developed and demonstrated at the SNS SCL but are applicable to hadron SCL operation in general and will be especially relevant to future ADS applications

please see instructions how to view/control embeded videos

Slides FR1AA06 [1.112 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-FR1AA06

About •

Received ※ 23 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 04 September 2022

Cite •

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