Lifetime Measurements of High Polarization Strained-Superlattice Gallium Arsenide at Beam Current > 1 Milliamp using a New 100kV Load Lock Photogun
Conference
·
OSTI ID:921646
A new 100 kV GaAs DC Load Lock Photogun has been constructed at Jefferson Laboratory, with improvements for photocathode preparation and for operation in a high voltage, ultra-high vacuum environment. Although difficult to gauge directly, we believe that the new gun design has better vacuum conditions compared to the previous gun design, as evidenced by longer photocathode lifetime, that is, the amount of charge extracted before the quantum efficiency of the photocathode drops by 1/e of the initial value via the ion back-bombardment mechanism. Photocathode lifetime measurements at DC beam intensity of up to 10 mA have been performed to benchmark operation of the new gun and for fundamental studies of the use of GaAs photocathodes at high average current*. These measurements demonstrate photocathode lifetime longer than one million Coulombs per square centimeter at a beam intensity higher than 1 mA. The photogun has been reconfigured with a high polarization strained superlattice photocathode (GaAs/GaAsP) and a mode-locked Ti:Sapphire laser operating near band-gap. Photocathode lifetime measurements at beam intensity greater than 1 mA are measured and presented for comparison.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA
- Sponsoring Organization:
- USDOE - Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 921646
- Report Number(s):
- JLAB-ACC-07-697; DOE/OR/23177-0257
- Country of Publication:
- United States
- Language:
- English
Similar Records
USING A 100 KV DC LOAD LOCK PHOTOGUN TO MEASURE PHOTOCATHODE LIFETIME OF HIGH POLARIZATION STRAINED SUPERLATTICE GAAS/GAASP AT BEAM INTENSITY >1 MILLIAMP
DC photogun vacuum characterization through photocathode lifetime studies
Measurements of photocathode operational lifetime at beam currents up to 10-mA using an improved DC high voltage GaAs photogun
Conference
·
Mon Jul 02 00:00:00 EDT 2007
·
OSTI ID:909345
DC photogun vacuum characterization through photocathode lifetime studies
Conference
·
Mon Jul 02 00:00:00 EDT 2007
·
OSTI ID:917021
Measurements of photocathode operational lifetime at beam currents up to 10-mA using an improved DC high voltage GaAs photogun
Conference
·
Fri Jun 01 00:00:00 EDT 2007
·
OSTI ID:917249