Beam brightness from a relativistic, field-emission diode with a velvet covered cathode

Conference · Thu Aug 01 00:00:00 EDT 1985

OSTI ID:6436469

Bekefi, G; Shefer, R E; Tasker, S C

The beam emittance and brightness from a mildly relativistic (200 to 400 kV) high current density (0.5 to 3.5kA/cm/sup 2/) planar, field emission diode provided with a velvet covered cathode have been studied experimentally as a function of the applied electric field (100 to 600kV/cm). Transverse beam spreading has been measured using a conventional pinhole arrangement followed by a fluorescent screen and open shutter camera. Good turn-on, and a high normalized beam brightness (B/sub n/ = 300kA/cm/sup 2/-rad/sup 2/) have been observed. The results are compared with those obtained with a graphite cathode. 11 refs., 6 figs.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6436469
• Report Number(s): CONF-850956-12; ON: DE86001112
• Resource Relation: Conference: 7. international free-electron laser conference, Tahoe City, CA, USA, 8 Sep 1985
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CATHODES
FIELD EMISSION
LINEAR ACCELERATORS
KILO AMP BEAM CURRENTS
BRIGHTNESS
CURRENT DENSITY
DIODE TUBES
ELECTRIC FIELDS
ELECTRON BEAMS
KEV RANGE 100-1000
RELATIVISTIC RANGE
ACCELERATORS
BEAM CURRENTS
BEAMS
CURRENTS
ELECTRODES
ELECTRON TUBES
EMISSION
ENERGY RANGE
KEV RANGE
LEPTON BEAMS
OPTICAL PROPERTIES
PARTICLE BEAMS
PHYSICAL PROPERTIES
430200* - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics