On 26/11/2018, after 6.0MeV 7Be and 7Li beam measurements:

At 11:15:

Far S2 bias = -130.0V, leak I = 1.60uA. Diode bias = -70.1V, leak I = 0.00uA.

Pressures (mBar):

• TPU1 = 8.5e-7
• TPU2 = 3.1e-7
• TPD1 = 6.2e-7
• TPD2 = 6.3e-7
• CHUP = Sensor Off
• CHDW = No Sensor

Detectors and preamps switched off. Turbos off. Line valve closed. Manual and T1600 backing valves closed. Ecodry 1 and 2 off.

Waited for turbos to spin down.

Opened vent valve at Turbo Entrance 3. The automatic FCC valve immediately closed -> interlock tripped downstream of chamber and stopped turbo at FCC.

With FCC valve closed (allowing the chamber to continue venting) we restarted turbo at FCC -> spun up to operating 1000 Hz.

Once chamber finished venting, the far S2 was removed and its 12um mylar was replaced with 0.9um mylar ready for beam measurements at Elab = 3MeV. See picture 1 for 0.9um mylar mounted in front of far S2.

Far S2 remounted with far iris arm. Far S2 preamp remounted.

Preamp power on, currents drawn are good. Far S2 biased to -130.0V, leak I = 1.53uA. Diode biased to -70V, leak I = 0.00uA.

Noise looked ok. Detector biases off.

12:50 Ecodry 1 and 2 on. Started opening manual valve.

13:05 manual valve opened fully. T1600 valve opened.

13:10 Turbos on, pressures reached ~9e-5 mBar

Far S2 bias = -130.0V, leak I = 1.48uA. Diode bias = -70.1V, leak I = 0.00uA.

Set new RAL thresholds whilst monitoring rate: (counting from left of RAL rack)

• RAL #1 and 2: 20mV
• RAL #3: 15mV
• RAL #4 and 5: 10mV
• RAL #6: 15mV

13:25 Pressures (mBar):

• TPU1 = 1.0e-5
• TPU2 = 2.8e-6
• TPD1 = 2.5e-6
• TPD2 = 3.3e-6
• CHUP = Sensor Off
• CHDW = No Sensor