2011 Particle Accelerator Conference - List of Keywords (superconducting-RF)

Paper	Title	Other Keywords	Page
TUP029	Low-Beta Superconducting RF Cavity Tune Options	cavity, simulation, resonance, insertion	865
	E.N. Zaplatin FZJ, Jülich, Germany
	The main method of the superconducting RF cavity frequency tuning is a resonator wall deformation. Since the highest frequency sensitivity on the geometry change is an accelerating gap variation, the "standard" place of deformation tuning force application in different cavity types are the cavity beam ports. A series of low-beta cavities (QWR, HWR, spoke-type) with different options of tuning have been investigated. Every option is compared with beam port displacement. The problem of resonator frequency shift self-compensation caused by external pressure fluctuations is discussed.

TUP220	Cryogenic Sub-System for the 56 MHz SRF Storage Cavity for RHIC	cavity, cryogenics, collider, booster	1226
	Y. Huang, D.L. Lederle, L. Masi, P. Orfin, T.N. Tallerico, P. Talty, R. Than, Y. Zhang BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. A 56 MHz Superconducting RF Cavity is being constructed for the RHIC collider. This cavity is a quarter wave resonator that will be operated at 4.4K. The cavity requires an extreme quiet environment to maintain its operating frequency. The cavity besides being engineered for a mechanically quiet system, also requires a quiet cryogenic system. Liquid helium is taken from RHIC's main helium 3.5 atm, 4.9K supply header to supply this sub-system and the boil-off is return to a separate local compressor system nearby. To acoustically separate the cryogenics' delivery and return lines, a condenser/boiler heat exchanger is used to re-liquefy the helium vapor generated by the cavity. A system description and operating parameters is given about the cryogen delivery sub-system.

THOCS1	Would >50 MV/m be Possible with Superconducting RF Cavities?	cavity, accelerating-gradient, electron, controls	2119
	T. Tajima LANL, Los Alamos, New Mexico, USA
	Several laboratories are working on the development of thin-film superconductor technology to overcome the fundamental limit of ~50 MV/m accelerating gradient with niobium SRF cavities. Efforts at LANL attempt to enhance the sustainable surface magnetic field by coating thin layers of superconductors, such as MgB2 on top of niobium. The coating techniques being developed and the results of RF critical field and surface resistance measurements that were obtained in collaboration with other national laboratories, universities and industry will be presented.
	Slides THOCS1 [0.751 MB]

Paper

Title

Other Keywords

Page

TUP029

Low-Beta Superconducting RF Cavity Tune Options

cavity, simulation, resonance, insertion

865

E.N. Zaplatin
FZJ, Jülich, Germany

The main method of the superconducting RF cavity frequency tuning is a resonator wall deformation. Since the highest frequency sensitivity on the geometry change is an accelerating gap variation, the "standard" place of deformation tuning force application in different cavity types are the cavity beam ports. A series of low-beta cavities (QWR, HWR, spoke-type) with different options of tuning have been investigated. Every option is compared with beam port displacement. The problem of resonator frequency shift self-compensation caused by external pressure fluctuations is discussed.

TUP220

Cryogenic Sub-System for the 56 MHz SRF Storage Cavity for RHIC

cavity, cryogenics, collider, booster

1226

Y. Huang, D.L. Lederle, L. Masi, P. Orfin, T.N. Tallerico, P. Talty, R. Than, Y. Zhang
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
A 56 MHz Superconducting RF Cavity is being constructed for the RHIC collider. This cavity is a quarter wave resonator that will be operated at 4.4K. The cavity requires an extreme quiet environment to maintain its operating frequency. The cavity besides being engineered for a mechanically quiet system, also requires a quiet cryogenic system. Liquid helium is taken from RHIC's main helium 3.5 atm, 4.9K supply header to supply this sub-system and the boil-off is return to a separate local compressor system nearby. To acoustically separate the cryogenics' delivery and return lines, a condenser/boiler heat exchanger is used to re-liquefy the helium vapor generated by the cavity. A system description and operating parameters is given about the cryogen delivery sub-system.

THOCS1

Would >50 MV/m be Possible with Superconducting RF Cavities?

cavity, accelerating-gradient, electron, controls

2119

T. Tajima
LANL, Los Alamos, New Mexico, USA

Several laboratories are working on the development of thin-film superconductor technology to overcome the fundamental limit of ~50 MV/m accelerating gradient with niobium SRF cavities. Efforts at LANL attempt to enhance the sustainable surface magnetic field by coating thin layers of superconductors, such as MgB2 on top of niobium. The coating techniques being developed and the results of RF critical field and surface resistance measurements that were obtained in collaboration with other national laboratories, universities and industry will be presented.

Slides THOCS1 [0.751 MB]