DESIGN AND PRELIMINARY TEST OF THE 1500 MHZ NSLS-II PASSIVE SUPERCONDUCTING RF CAVITY

Conference · Mon Mar 28 00:00:00 EDT 2011

OSTI ID:1016639

Rose, J; Gash, W; Kosciuk, B; Ravindranath, V; Sikora, B; Sharma, S; Towne, N; Grimm, T L; Boulware, C H; Krizmanich, C; Kuhlman, B; Miller, N; Siegel, B; Winowski, M

NSLS-II is a new ultra-bright 3 GeV 3rd generation synchrotron radiation light source. The performance goals require operation with a beam current of 500mA and a bunch current of at least 0.5mA. Ion clearing gaps are required to suppress ion effects on the beam. The natural bunch length of 3mm is planned to be lengthened by means of a third harmonic cavity in order to increase the Touschek limited lifetime. Earlier work described the design alternatives and the geometry selected for a copper prototype. We subsequently have iterated the design to lower the R/Q of the cavity and to increase the diameter of the beam pipe ferrite HOM dampers to reduce the wakefield heating. A niobium cavity and full cryomodule including LN2 shield, magnetic shield and insulating vacuum vessel have been fabricated and installed. A passive SRF 3rd harmonic cavity consisting of two tightly coupled cells has been designed and fabricated for NSLS-II. Initial cold tests of this cavity are very promising. These tests have verified that the cavity frequency and mode separation between the 0 and {pi}-modes can be set at manufacture. Further, the frequency separation can be maintained over wide tuning ranges necessary for operation. Future work includes HOM damper and motorized tuner development.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
• Sponsoring Organization: DOE - OFFICE OF SCIENCE
• DOE Contract Number: DE-AC02-98CH10886
• OSTI ID: 1016639
• Report Number(s): BNL-94939-2011-CP; 39KC02000; TRN: US1103083
• Resource Relation: Conference: Particle Accelerator Conference PAC11; New York, NY; 20110328 through 20110401
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
BEAM CURRENTS
COPPER
DESIGN
FERRITE
GEOMETRY
HARMONICS
HEATING
LIFETIME
LIGHT SOURCES
NIOBIUM
PERFORMANCE
SHIELDS
SYNCHROTRON RADIATION
TUNING
3 GeV 3rd generation synchrotron
performance goals require operation with a beam current of 500mA
national synchrotron light source