Anomalous electron loading in SLAC 5045 klystron and relativistic klystron input cavities

Conference · Wed Mar 01 04:00:00 EST 1989

OSTI ID:5989809

Koontz, R F; Fowkes, R W; Lavine, T L; Miller, R H; Vlieks, A E

Recent studies of RF breakup and instability in the SLAC 5045 klystrons have revealed that many production klystrons show loading of the input cavity by low energy electrons even under cold cathode no beam conditions. Sometime after the onset of the RF drive pulse, the input cavity absorbs a portion of the incident RF drive that would otherwise be reflected from the not-beam-loaded cavity. This power absorption is a function of drive level, and of axial magnetic field surrounding the cavity. No power absorption is present when the axial magnetic field is zero. This same phenomenon has been observed in the input cavity of relativistic klystron experiments being conducted as part of the SLAC-LBL-LLNL development program. The phenomenon may be associated with RF breakup and RF instability in SLAC 5045 klystrons, and with unstable pulse shortening in the relativistic klystron experiments. This paper outlines some old and new observations of microwave beam device malfunctions that probably are associated with low energy electron fluxes in the vacuum environments of microwave power devices. 2 refs., 5 figs.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (USA)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 5989809
• Report Number(s): SLAC-PUB-4867; CONF-890335-156; ON: DE89012782
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430300* -- Particle Accelerators-- Auxiliaries & Components
DESIGN
ELECTRON TUBES
ELECTRONIC EQUIPMENT
ENERGY RANGE
EQUIPMENT
INSTABILITY
KLYSTRONS
MAGNETIC FIELDS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
RELATIVISTIC RANGE
RF SYSTEMS