Injector Studies Using Superlattice Photocathode R. Suleiman, 13 Jan 2005 1. Running Conditions 2. PZT Scan 3. IA Scan RHWP Scan PITA Scan

Running Conditions 10 Jan 2005 Superlattice photocathode in gun3 Hall C at 4-pass, E=4625 MeV. HWP IN. Beam current 60 uA. Transmission ~ 0.93

PZT x-Scan

PZT y-Scan

QE plot done that morning Beam was at 700,730 Spot diameter 5mm PZT x SLOPES: x-diff slopes (um/V) y-diff slopes (um/V) 1I02 7.35 2.03 1I04 23.37 2.82 0I02A -5.39 0.90 0L03 -3.24 -6.28 0L04 -0.34 -2.76 0L06 5.87 1.31 0R05 -2.75 3.91 C20A 1.12 5.51 H00 -3.13 -0.93 H00A -2.49 -1.63 H00B -2.35 -0.66 BCM 0L02: -2854 ppm/V BCM 1 (Hall C): 3620 ppm/V PZT y SLOPES: x-diff slopes (um/V) y-diff slopes (um/V) 1I02 4.03 -1.23 1I04 2.08 -20.02 0I02A -2.05 14.83 0L03 -1.63 2.07 0L04 -4.73 3.92 0L06 12.19 -1.63 0R05 -7.31 3.39 C20A -0.27 -1.76 H00 0.80 0.18 H00A 0.54 0.21 H00B 0.41 0.23 BCM 0L02: -961 ppm/V BCM 1 (Hall C): 948 ppm/V QE plot done that morning Beam was at 700,730 Spot diameter 5mm PZT x moves laser on cathode by 7um/V PZT x Scan showed a 41% /mm change in QE

IA Scan BCM 0L02: -127 ppm/V BCM 1 (Hall C): 124 ppm/V

RHWP Scan

PITA Scan BCM 0L02: 187 ppm/V BCM 1 (Hall C): -140 ppm/V This is setting voltage. 1 setting Volt corresponds to 60 V on the Pockel Cell on top of 2.7 kV