GTS meeting 10 09 17

• High current runs

• Why is photocathode lifetime limited (100 - 300 C)?

1. Laser heating and QE decay
2. Laser size too small?

• Remaining tasks before shutdown:

1. Measure lifetime with a larger laser size (~rms=0.5 mm)
2. Measure lifetime for: 0 A, 50 A, 100 A, 150 A, 200 A, 300 A, 400 A (Gun HV=300 kV, I=3.0 mA) - Done - [1]
3. Lifetime vs biased anode
4. Slit-Viewer emittance measurement: Slit1 and Viewer3 with focus lens