SciTech Connect

Title: Optimization of the Low-Loss SRF Cavity for the ILC

Optimization of the Low-Loss SRF Cavity for the ILC The Low-Loss shape cavity design has been proposed as a possible alternative to the baseline TESLA cavity design for the ILC. The advantages of this design over the TESLA cavity are its lower cryogenic loss, and higher achievable gradient due to lower surface fields. High gradient prototypes for such designs have been tested at KEK (ICHIRO) and JLab (LL). However, issues related to HOM damping and multipacting (MP) still need to be addressed. Preliminary numerical studies of the prototype cavities have shown unacceptable damping for some higher-order dipole modes if the typical TESLA HOM couplers are directly adapted to the design. The resulting wakefield will dilute the beam emittance thus reduces the machine luminosity. Furthermore, high gradient tests on a 9-cell prototype at KEK have experienced MP barriers although a single LL cell had achieved a high gradient. From simulations, MP activities are found to occur in the end-groups of the cavity. In this paper, we will present the optimization results of the end-groups for the Low-Loss shape for effective HOM damping and alleviation of multipacting. Comparisons of simulation results with measurements will also be presented.
Authors: ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
OSTI Identifier:921642
Report Number(s):JLAB-ACC-07-674; DOE/OR/23177-0265
TRN: US0801653
DOE Contract Number:AC05-06OR23177
Resource Type:Conference
Data Type:
Resource Relation:Conference: 2007 IEEE Particle Accelerator Conference, Albuquerque, NM, 25-30 June 2007
Research Org:Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org:USDOE - Office of Science (SC)
Country of Publication:United States
Language:English
Subject: 43 PARTICLE ACCELERATORS; ACCELERATORS; BEAM EMITTANCE; CAVITIES; CRYOGENICS; DAMPING; DESIGN; DIPOLES; LUMINOSITY; OPTIMIZATION; SHAPE; SIMULATION