Design of coupler for the NSLS-II storage ring superconducting RF cavity

Conference · Mon Mar 28 04:00:00 EDT 2011

OSTI ID:1016651

Yeddulla, M; Rose, J

NSLS-II is a 3GeV, 500mA, high brightness, 1 MW beam power synchrotron facility that is designed with four superconducting cavities working at 499.68 MHz. To operate the cavities in over-damped coupling condition, an External Quality Factor (Qext) of {approx}65000 is required. We have modified the existing coupler for the CESR-B cavity which has a Qext of {approx}200,000 to meet the requirements of NSLS-II. CESR-B cavity has an aperture coupler with a coupler 'tongue' connecting the cavity to the waveguide. We have optimized the length, width and thickness of the 'tongue' as well as the width of the aperture to increase the coupling using the three dimensional electromagnetic field solver, HFSS. Several possible designs will be presented. We have modified the coupler of the CESR-B cavity to be used in the storage ring at the NSLS-II project using HFSS and verified using CST Microwave Studio. Using a combination of increasing the length and width of the coupler tongue and increasing the width of the aperture, the external Q of the cavity coupler was decreased to {approx}65000 as required for the design of the NSLS-II storage ring design.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: DOE - OFFICE OF SCIENCE
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1016651
• Report Number(s): BNL--94977-2011-CP; 39KC02000
• Country of Publication: United States
• Language: English

Related Subjects

3GeV
43 PARTICLE ACCELERATORS
500mA
ACCELERATORS
APERTURES
BRIGHTNESS
CAVITIES
DESIGN
ELECTROMAGNETIC FIELDS
QUALITY FACTOR
STORAGE RINGS
SYNCHROTRONS
THICKNESS
aperture
cavity
convex
electromagnetic
flutes
national synchrotron light source
neglect
pipe
waveguide