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Title: RF design of a transverse mode cavity for kaon separation

RF design of a transverse mode cavity for kaon separation Two deflecting mode RF systems can be used to separate secondary kaons from a momentum selected particle beam, primarily consisting of a mix of protons, pions and kaons, by a time of flight method. The principles of this methods and the choices of the parameters are explained. It is planned to use a 3.9 GHz 13-cell super-conducting cavity operated in a {pi}-dipole-mode. First, the passband structure of different cavity shapes, which mainly differ by the cell-to-cell coupling and the resulting dispersion slope, is investigated. The main concern is the frequency difference between the {pi}-mode and the next lowest mode in the same passband and the implications on the tuneability of the cavity. For three shapes the possible end-cell designs for a 7-cell and 13-cell cavity are presented. All numerical field calculations are performed by the MAFIA code. An equivalent circuit model, based on a two chain model, is applied to a 7-cell cavity. It is demonstrated that the dispersion diagram obtained by MAFIA calculations can be very well approximated by this equivalent circuit.
Authors:
Publication Date:
OSTI Identifier:OSTI ID: 780614
Report Number(s):FERMILAB-TM-2144
TRN: US0102479
DOE Contract Number:AC02-76CH03000
Resource Type:Technical Report
Resource Relation:Other Information: PBD: 15 May 2001
Research Org:Fermi National Accelerator Lab., Batavia, IL (US)
Sponsoring Org:USDOE Office of Energy Research (ER) (US)
Country of Publication:United States
Language:English
Subject: 43 PARTICLE ACCELERATORS; DESIGN; EQUIVALENT CIRCUITS; KAONS; PARTICLE BEAMS; PIONS; PROTONS; RF SYSTEMS; TIME-OF-FLIGHT METHOD; BEAM SPLITTING; SUPERCONDUCTING DEVICES; MATHEMATICAL MODELS