1. Ion simulations in the GTS at 300 kV
Cristhian Valerio
September 2018

2. Ions impacting the phtotocathode: Anode Bias: 0 Volts
Gun solenoid OFF
Gun solenoid ON
Beam spot 2 mm up
Beam spot center of photocathode

3. Ions impacting the photocathode: Anode bias +1000 Volt
Gun solenoid ON
Gun solenoid OFF
Beam spot 2 mm up
Beam spot center of photocathode

4. Ions impacting the photocathode: Anode bias -271 Volts
Gun solenoid ON
Gun solenoid OFF
Beam spot 2 mm up
Beam spot center of photocathode

5. Gun solenoid OFF, but MFGGT02 beamline solenoid ON both cases
Red: Primary ions
Yellow: secondary electrons
Pink: secondary ions
Anode Bias Volts
Anode Bias -271 Volts

6. Trapped ions? Gun solenoid ON, MFGGT02 beamline solenoid ON
Anode Bias Volts
Red: Primary ions
Yellow: secondary electrons