SRF2013 - List of Keywords (superconducting-cavity)

Paper	Title	Other Keywords	Page
MOP069	Precise Measurement of Superconducting Cavity Movement in Cryomodule by the Position Monitor Using White Light Interferometer	target, cryomodule, cavity, linac	291
	H. Sakai, T. Aoto, K. Enami, T. Furuya, M. Sato, K. Shinoe, K. Umemori KEK, Ibaraki, Japan E. Cenni Sokendai, Ibaraki, Japan K. Hayashi, K. Kanzaki Tokyo Seimitsu Co. Ltd, Ibaraki, Japan M. Sawamura JAEA, Ibaraki-ken, Japan
	Alignment of Superconducting cavity is one of the important issues for linear collider and/or future light source like ERL and X-FEL. To measure the cavity displacement under cooling to Liq He temperature more precisely, we newly developed the position monitor by using white light interferometer. This monitor is based on the measurement of the interference of light between the measurement target and the reference point. It can measure the position from the outside of the cryomodule. We applied this monitor to the main linac cryomodule of Compact ERL and successfully measured the displacement during 2K cooling with the resolution of 10 micron

MOP093	Geometric Optics of Wake Fields of Very Short Bunches in Superconducting Cavities	cavity, wakefield, HOM, FEL	367
	A. Novokhatski SLAC, Menlo Park, California, USA
	Funding: Work supported by Department of Energy contract DE-AC02-76SF00515 We study the wake potentials of very short bunches in a quasi periodic structure of superconducting cavities. We analyze the pattern of the electric force lines and the shape of a cavity. The behavior of electric force lines reflects irregularities of the shape structure of a cavity. Simulations were carried for different kind of cavities, including JLAB 7 cell cavity with application to future light sources.

TUP061	Update on Study of Welding Porosity in Nb EBW	cavity, neutron, SRF, target	567
	Y. Iwashita, Y. Fuwa, H. Tongu Kyoto ICR, Uji, Kyoto, Japan H. Hayano KEK, Ibaraki, Japan
	Voids have been found in the Nb EBW seams. Since the buried defects cannot be observed by the optical inspections, other techniques have to be applied to study their characteristics such as distributions. X-ray or neutron radiography have been tried for the purpose. The recent results will be presented.

TUP090	Thermal Simulations for the Multi-Layer Coating Model	simulation, feedback, electromagnetic-fields, cavity	674
	F. Meng IHEP, Beijing, People's Republic of China A. Romanenko Fermilab, Batavia, USA Y. Xie Euclid TechLabs, LLC, Solon, Ohio, USA
	Thermal simulations for the multi-layer coating model has been developed based on previous work of a finite difference thermal feedback code.* RF field-attenuation formula for the multi-layer coating model has also been included.** The temperature distribution along different superconducting layers under applied magnetic fields has been calculated with various superconducting material parameters. Y. Xie et.al., "Relationship between defects pre-heating and defects size", SRF2009. *T. Kubo et.al.,"Rf field-attenuation formulae for the multilayer coating model", IPAC2013

THP004	Design Progress of SSR1 Single Spoke Resonator for RAON	cavity, simulation, acceleration, operation	899
	H.J. Cha, D. Jeon, H.C. Jung, H.J. Kim, G.-T. Park IBS, Daejeon, Republic of Korea R.E. Laxdal, Z.Y. Yao, V. Zvyagintsev TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	Funding: The Ministry of Science, ICT and Future Planning (MSIP) and the National Research Foundation (NRF) of the Republic of Korea under Contract 2011-032011 An advanced heavy ion accelerator for basic sciences and multiple applications, called “RAON”, is under construction in Daejeon, South Korea. The fabrication of prototypes for four different types of superconducting cavities, QWR, HWR, SSR1 and SSR2, is scheduled based on the on-going technical designs. In this paper, we present the electromagnetic and mechanical analyses for the SSR1 cavity (β=0.3 and f=325 MHz). Several variants have been considered and compared in terms of rf parameters, multipacting sensitivity, helium pressure sensitivity and ease of fabrication. This includes an analysis of stiffening rings and helium jacket design for stable operation. The progress towards the design of the SSR1 cavity will be given.

THP028	The Research on Spoke 0.40 Cavity	cavity, simulation, proton, linac	959
	P. Sha, H. Huang Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China W.M. Pan, X.Y. Zhang IHEP, Beijing, People's Republic of China
	Spoke superconducting cavity can be used in the low-energy section of the proton accelerator. It has many significant advantages: compact structure, high value of R/Q, etc. The Chinese ADS (Accelerator Driven System) project will adopt many spoke cavities with 3 different β values (0.12, 0.21, 0.40). Spoke040 cavities (β=0.40) are used to increase the proton energy from 34 MeV to 178 MeV. Now the physical design of spoke040 cavity has been finished, and the machining are going on right now. The vertical test would be held at the end of this year.

Paper

Title

Other Keywords

Page

Precise Measurement of Superconducting Cavity Movement in Cryomodule by the Position Monitor Using White Light Interferometer

target, cryomodule, cavity, linac

291

H. Sakai, T. Aoto, K. Enami, T. Furuya, M. Sato, K. Shinoe, K. Umemori
KEK, Ibaraki, Japan
E. Cenni
Sokendai, Ibaraki, Japan
K. Hayashi, K. Kanzaki
Tokyo Seimitsu Co. Ltd, Ibaraki, Japan
M. Sawamura
JAEA, Ibaraki-ken, Japan

Alignment of Superconducting cavity is one of the important issues for linear collider and/or future light source like ERL and X-FEL. To measure the cavity displacement under cooling to Liq He temperature more precisely, we newly developed the position monitor by using white light interferometer. This monitor is based on the measurement of the interference of light between the measurement target and the reference point. It can measure the position from the outside of the cryomodule. We applied this monitor to the main linac cryomodule of Compact ERL and successfully measured the displacement during 2K cooling with the resolution of 10 micron

MOP093

Geometric Optics of Wake Fields of Very Short Bunches in Superconducting Cavities

cavity, wakefield, HOM, FEL

367

A. Novokhatski
SLAC, Menlo Park, California, USA

Funding: Work supported by Department of Energy contract DE-AC02-76SF00515
We study the wake potentials of very short bunches in a quasi periodic structure of superconducting cavities. We analyze the pattern of the electric force lines and the shape of a cavity. The behavior of electric force lines reflects irregularities of the shape structure of a cavity. Simulations were carried for different kind of cavities, including JLAB 7 cell cavity with application to future light sources.

TUP061

Update on Study of Welding Porosity in Nb EBW

cavity, neutron, SRF, target

567

Y. Iwashita, Y. Fuwa, H. Tongu
Kyoto ICR, Uji, Kyoto, Japan
H. Hayano
KEK, Ibaraki, Japan

Voids have been found in the Nb EBW seams. Since the buried defects cannot be observed by the optical inspections, other techniques have to be applied to study their characteristics such as distributions. X-ray or neutron radiography have been tried for the purpose. The recent results will be presented.

TUP090

Thermal Simulations for the Multi-Layer Coating Model

simulation, feedback, electromagnetic-fields, cavity

674

F. Meng
IHEP, Beijing, People's Republic of China
A. Romanenko
Fermilab, Batavia, USA
Y. Xie
Euclid TechLabs, LLC, Solon, Ohio, USA

Thermal simulations for the multi-layer coating model has been developed based on previous work of a finite difference thermal feedback code.* RF field-attenuation formula for the multi-layer coating model has also been included.** The temperature distribution along different superconducting layers under applied magnetic fields has been calculated with various superconducting material parameters.
*Y. Xie et.al., "Relationship between defects pre-heating and defects size", SRF2009.
**T. Kubo et.al.,"Rf field-attenuation formulae for the multilayer coating model", IPAC2013

THP004

Design Progress of SSR1 Single Spoke Resonator for RAON

cavity, simulation, acceleration, operation

899

H.J. Cha, D. Jeon, H.C. Jung, H.J. Kim, G.-T. Park
IBS, Daejeon, Republic of Korea
R.E. Laxdal, Z.Y. Yao, V. Zvyagintsev
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

Funding: The Ministry of Science, ICT and Future Planning (MSIP) and the National Research Foundation (NRF) of the Republic of Korea under Contract 2011-032011
An advanced heavy ion accelerator for basic sciences and multiple applications, called “RAON”, is under construction in Daejeon, South Korea. The fabrication of prototypes for four different types of superconducting cavities, QWR, HWR, SSR1 and SSR2, is scheduled based on the on-going technical designs. In this paper, we present the electromagnetic and mechanical analyses for the SSR1 cavity (β=0.3 and f=325 MHz). Several variants have been considered and compared in terms of rf parameters, multipacting sensitivity, helium pressure sensitivity and ease of fabrication. This includes an analysis of stiffening rings and helium jacket design for stable operation. The progress towards the design of the SSR1 cavity will be given.

THP028

The Research on Spoke 0.40 Cavity

cavity, simulation, proton, linac

959

P. Sha, H. Huang
Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China
W.M. Pan, X.Y. Zhang
IHEP, Beijing, People's Republic of China

Spoke superconducting cavity can be used in the low-energy section of the proton accelerator. It has many significant advantages: compact structure, high value of R/Q, etc. The Chinese ADS (Accelerator Driven System) project will adopt many spoke cavities with 3 different β values (0.12, 0.21, 0.40). Spoke040 cavities (β=0.40) are used to increase the proton energy from 34 MeV to 178 MeV. Now the physical design of spoke040 cavity has been finished, and the machining are going on right now. The vertical test would be held at the end of this year.