Title :
Tuning and coupling mismatch tolerance in cavities driven by a quadrature hybrid
Author :
Vetter, Arthur M.
Author_Institution :
Boeing Def. & Space Group, Seattle, WA, USA
Abstract :
An attractive drive concept for accelerator cavities employs quadrature hybrids to drive cavities in pairs as shown. This protects the klystron from reflected power from the cavities during ordinary (non-fault) operation, so long as their complex reflection coefficients and beam loading are equal, without recourse to high power circulators. Assuming a perfectly balanced split and correctly matched phase lengths in the drive legs to the two cavities, the voltage standing wave ratio (VSWR) seen by the klystron will be entirely due to differences in the tuning, coupling, and beam loading of the two cavities. The allowable mismatches in tuning and coupling for a given maximum VSWR are determined, assuming no beam present.<>
Keywords :
beam handling equipment; klystrons; accelerator cavities; beam loading; complex reflection coefficients; coupling; coupling mismatch tolerance; drive concept; drive legs; high power circulators; klystron; matched phase lengths; perfectly balanced split; quadrature hybrid; reflected power; tuning; voltage standing wave ratio; Circuit optimization; Coupling circuits; Frequency; Klystrons; Optical coupling; Optical reflection; Resonance; Tuning; Virtual colonoscopy; Voltage;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164534
