Tuesday, January 07, 2025, 16:00 - Target assembly installed in test stand. electrical connections assessed:
Prior to installation: oven and cathode isolated from heatshield. no shorts
After installation: Oven and Cathode 35kΩ from HVC.
Tuesday, January 07, 2025, 16:05 - pumping down to rough vacuum
Tuesday, January 07, 2025, 16:45 TP1B on. TP1A on. Pumping down
Prior to proceeding, ensure that ALL water cooling is turned on, as it was all drained and empty for the past 2 weeks.
Tuesday, January 07, 2025, 17:10 Beam line TP1 and TP2 on.
Wednesday, January 08, 2025, 09:01 chamber pressure at 1.0E-6 T, beamline pressure at 3.7E-7 T
Wednesday, January 08, 2025, 10:32 - water cooling all on. no effect on vacuum pressure.
Wednesday, January 08, 2025, 10:33 - Increased argon pressure in the gas line has no effect on vacuum pressure. it is registered on the pressure gauge at feedthrough.-
- However, roughing pump doesn't seem to be venting the argon gas line. I disconnected the copper line to the venting valve to confirm pump activity. - no activity detectable.
- removed pump from assembly. switching on by itself shows no evidence of pump functionality. When on, pump is heating to very hot temperatures. I've emailed Edi at vacuum group to investigate further.
Wednesday, January 08, 2025, 15:02 - Vacuum group says that the pump is dead. We can replace it if we'd like, but i've created a temporary solution by connecting the argon venting valve to the backing pumps. For the sake of being careful (although this may be overly cautious), we must avoid opening this venting valve without first isolating the connection from the turbo pumps via closing TSG:PV1
Wednesday, January 08, 2025, 15:04 ramping up COIL to ensure conditioning against outgassing later. vacuum appears to be stabilizing below 2e-6 T
Wednesday, January 08, 2025, 16:32 vacuum recovered, beginning to heat at 1A/30s up to 580A/230A TGHT/TBHT
Wednesday, January 08, 2025, 22:32 with COIL on, the vacuum pressure increased to ~2.2E-6 T before beginning to recover, leaving on to encourage vacuum recovery.
Thursday, January 09, 2025, 08:27 Vacuum at 1.0E-6 T. COIL off.
Thursday, January 09, 2025, 10:15 Argon gas line at 0.5 bar.a
Thursday, January 09, 2025, 10:56 increasing BIAS/EE/EZL to 30/1.5/13 kV
Thursday, January 09, 2025, 11:19 turning on optics elements. TMS:Q2 is timed out and possibly unalive. - must be investigated
Thursday, January 09, 2025, 12:38 HV at 30kV. monitoring for spark activity
Thursday, January 09, 2025, 12:53 over 15 minutes, there was just one possible spark. I see also that TPS:Q2 (quadrupole prior to FC0) seems to be half-down. i can't seem to get it to stop timing out and recharge. must investigate further
after investigating further and attempting to reset/reconfigure. I tried power cycling the canbus controller as well. In the end, controls group determined that this controller needed to be replaced.
Thursday, January 09, 2025, 14:34 all optics set. setting COIL CATHODE to 40A 120V. CATHODE is leaking 0 current. (0.000 mA readback).
Thursday, January 09, 2025, 14:37 reading 2.91e-8A at FC0 . found Argon peak at 40 exactly. MB1 current 96.4561 A
Thursday, January 09, 2025, 14:42 using COIL CATHODE scan program to optimize. (data file measure_id=9106) A local maximum was identified at 140V with 40A coil current. However, a short seems to show up when the cathode voltage reaches ~130V. it lets through only ~10mA at 130 and then will release up to at least 100mA at 140V.
As time passes, the sustained voltage drops over time, given a current limit of 100mA. it dropped to ~50V. On subsequent increases of the power supply, current begins leaking through at ~65V.
Given this, I will continue (while monitoring the cathode power supply) with a cathode coil of 50V 90A.
Thursday, January 09, 2025, 15:28 FC0 = 2.21 e-8 A. FC6 at 3.21e-10A RPM taken for all 4.
Thursday, January 09, 2025, 16:04 mass scan complete - 2025_01_09-16_01 FEBIAD no retainer 1.txt CATHODE voltage was stable at 50V throughout.
Thursday, January 09, 2025, 16:07 decreasing BIAS/EE/EZL to 0, 0, 0
Friday, January 10, 2025, 09:09 ramping BIAS/EE/EZL to 30/1.5/13 kV
Friday, January 10, 2025, 11:51 Increasing COIL and CATHODE to 90A and 50V (was able to ramp cathode up to 100V before seeing current loss)
Friday, January 10, 2025, 11:53 FC0 = 1.7e-8 A. FC6 = 4.9e-10 A wire scans taken.
Friday, January 10, 2025, 12:00 Beginning mass scan with COIL CATHODE at 90A 50V - 2025_01_10-12_28 FEBIAD no retainer 2.txt
Friday, January 10, 2025, 12:28 decreasing BIAS/EE/EZL to 0, 0, 0
Friday, January 10, 2025, 13:15 gas inflow OFF (at rough vacuum pressure). Ramping up again BIAS/EE/EZL to 30/1.5/13 kV
Friday, January 10, 2025, 14:27 FC0 = 1.22e-8A. FC6 = 2.93e-12A (at 40) . mass scan taken = 2025_01_10-14_18 FEBIAD no retainer 3 argon off.txt wire scans taken.
Friday, January 10, 2025, 14:28 TGHT TBHT cooling to 0A 0A at 1A/30s
Monday, January 13, 2025, 11:00 testing cathode isolation on cold target by ramping up cathode voltage until breakdown. At 120V, CATHODE current is 2.4mA. (125V, 8.5mA), at 130V, current limiting and dropping voltage.
Monday, January 13, 2025, 11:10 power supplies off. Winding down turbo pumps for chamber evac
Monday, January 13, 2025, 13:07 venting
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