TM3 has been moved  from SHC to TCS. The move is smooth.

TM3 module top helium spray leak test was done yesterday.  No leak on TM3 module top @ LD base leak rate 0.0 x E-9 atm.cc/sec.

TM3 helium pressure test and electrical check with new source tray at TCS were done yesterday. The results are excellent. See attachment

Saturday, April 27, 2024, 09:35 :

Started ramping up HV, EE and EL together. First small spark at 20.5kV on bias, no reaction in other devices.

Note both BIAS and EL are off in their readbacks. See table below

Saturday, April 27, 2024, 10:23 :

Spark on HV only at 25.5, couple sparks from here to 33, then at 33 starts real conditioning.

EL is reacting to some of the sparks, not sure if this is just electrical noise or not.

Saturday, April 27, 2024, 18:14 :

lots of trips above 60kV on the set pt. tripping off turbos and gauges. IG2 needed the controller reset.

RESULT: Got to 64.5 (actual) 62 (set point) with quite a bit of sparking over 60kV. Will go the rest of the way to 73 in the next days. Data dumped as isac/data/TM3_HVtests_Apr272024.dat

Sunday, April 28, 2024, 11:23 :

Ramped back up to 60kV reasonably easily, couple sparks and turbo trips.

Went up to 64kV (set point) with a lot of difficulty. Data dumped as isac/data/TM3_HVtests_Apr282024.dat

Monday, April 29, 2024, 14:58 :

Ramped up to set pt 62 easily, went down to 500V then 100V steps after that.

Went to set pt of 67 and left it there for ~40mins. Not perfectly stable but not too bad.

Tuesday, April 30, 2024, 17:12 :

After rebooting the TCS PLC to fix all the non-responsive devices, everything is working fine again.

Ramped easily to 60kV in 1kV steps.

Still got to 67 without too much trouble. Behaving pretty well...

At 70.2 (set pt, 71.3 readback) the water and vacuum gauge both tripped off and cannot be restarted. I am not sure what the real power supply reading is here but in the past it has been 70.5 set pt = 73 real value, which is as high as the power supply goes.

Stopping here since I'm not sure the water is circulating... the off pump says it is and the on pump says its not... left it at 70.2 for 40mins, still sparking going on (20:28 to 21:10)

Data dumped as isac/data/TM3_HVtests_Apr302024.dat

Sunday, May 05, 2024, 10:50 :

Containment box and target installed.

HV conditioning starting at 47kV.

Spark at 58kV knocked out IG1. Continuing with IG2 and IG1S.

Went up to set point of 63, readback 64. Will continue on Monday.

Data dumped: isac/data/TM3_HVtests_May52024.dat

Monday, May 06, 2024, 09:37 :

Ramping system back up.

First sparks at 50kv while raising the EL voltage (not sure if they are related).

AS: Voltage quickly up to 63 kV from 49 kV. Very smooth, no sparks or instabilities. Ramped at around 250 V steps every 10-20 seconds. First signs of instability at ~62.75 kV and definitely at 63 kV. I guess this is where it was conditioned to last. Let sit at 63 kV for a while while doing something else. It sparked once and turned off a turbo after half an hour. Starting ramping again.

AS: Spark at 65.75 kV killed IG1. Carla manually reset at 69 kV. Still working. A spark at 70.25 kV took out IG1 again.

AS: Maximum voltage reached at about 16:45. Setpoint 70.5 kV, readback 71.7 kV, PS itself ~73 kV. Carla reset IG1.

AS: 18:30, spent about 1.5 hours cumulatively at this maximum voltage. During this time it sparked about 15 times. Not long enough to tell if the spark frequency is decreasing. In the middle of this, Carla did something accidentally and caused the voltage to drop a bunch, so I manually set it to 0 V. She then reset TP1S, which was not staying on. Also, the EE and EL stayed at their respective voltages during this downtime (2 kV and 28.7 kV). I ramped the main BIAS voltage back up to the maximum voltage within 5 minutes and it was smooth all the way but sparked again at the maximum voltage. It seems conditioned up to or near the max voltage. Ramped down and turned off BIAS, EL, and EE.

AS: Dumped data to isac/data/TM3_HVtests_May62024_Alexander.dat

Tuesday, May 07, 2024, 10:02 :

Tested the EE - ramped up easily to 7kV, but then had issues maintaining the voltage. No vacuum response. Ramped down since we never use it that high anyway, though cable should be good for 10kV. More investigations later.

EDIT 2024-11-25, Alexander Shkuratoff:

Summary of StripTool data taken during this round of tests:

	TM3_HVtests_Apr272024.dat	2024-04-27 18:56	12M
	TM3_HVtests_Apr282024.dat	2024-04-28 13:16	1.4M
	TM3_HVtests_Apr302024.dat	2024-04-30 21:11	9.0M
	TM3_HVtests_May52024.dat	2024-05-05 13:06	5.0M
	TM3_HVtests_May62024_Alexander.dat	2024-05-06 18:45	9.5M

Travis and I moved TM3 from TCS to SHC this afternoon. The move is smooth.

TM3 has been moved  from SHC to TCS by David and Frank. The move is smooth.

TM3 with UCx#44 electrical check and leak check are good. see attachment.

HS line 70 psi helium pressure test at TCS: no leak at 0.0xe-9 torr.

After new containment box installation on TM3, Chad and I did a helium spray leak check on two VCR fittings on front side water lines. they are leak free.

Helium pressurize window water line to 70 psi for 3minutes. No response on leak detector which is 0.0xe-9 atm.cc/sec.

TCS was argon vented this morning between 7:00 to 8:30 am before module was moved to ITE.

The move is smooth and successful.

Tm3 has been connected in ITE.  see attachment.

Tuesday, May 14, 2024, 10:26 :

Ramping up bias/EE/EL on ITE - will see if the HV cage in the pit can hold 60kV or not.

At around 50kV the bias read current starts to get jumpy. Doesn't look like its an issue for the voltage, but definitely instability increases.

Occasional sparks seem to increase the EL current significantly...

David heard some sparks in the target hall. Looks like from heat shield feed through to the top of the cage. Several sparks heard in the TH also changed the einzel lens draw current significantly. These feethroughs are not far from each other so could be related.

Apparently the sparking also tripped off all the optics and heaters in ITW, by changing the state of the water flow interlock. Interesting and not seen ever before. Will test again with the cage off, rather than risk tripping ITW again.

Tried ramping up the voltage on just the EE. Seems the limit is 7kV - at that level it gets sparky and unstable. Should be investigated (should hold 10kV) but not critical for module function.

Wednesday, May 15, 2024, 10:05 :

HV cover was removed this morning and the MAA was locked out.

Started ramping things up, was very easy until around 58kV. At 59.5kV a spark tripped off the EL. Canbus controller had to be power cycled to fix it. Bias current is much more stable in this configuration.

Ramped up again while listening from the TH to see if it was sparking outside. Went slowly to 60kV (left EL at 29kV) and didn't see any outside sparks in the first 10 mins, couple sparks in vacuum. But after 15 mins a spark seems to have fried the EL canbus card. We were not in the TH so not sure if it was on the outside or not.

After 2 hours a spark tripped off both ITE and ITW. Looks like it makes a water interlock go bad momentarily, but after the trip the interlocks seem fine.

Tuesday, May 28, 2024, 16:41

Running TM3 at any voltage in ITE produces fairly destructive sparks. There are not many but so far they have tripped off all optics in ITW, the water flow interlocks (later forced on to prevent this), the EL (generally comes back but killed the canbus card once), destroyed two vacuum gauge controllers, and may have contributed to the cathode short on ITE-TM3-UC44-LP-FEBIAD.

The conditioning process seems to go as planned, but the occassional inevitable spark still trips things, which is making it difficult to run stable.

Will continue with regular HV conditioning to see if this helps. Control over the current limit on the ITE:BIAS supply would also help, but seems a complicated thing to add according to Roberto.

TM3 sat fine at 53kV overnight and at 58kV for several hours. The EZL trips off maybe once every 2-3hrs or so, which is not ideal but liveable. This was with the TGHT and CHT power supplies forced, so not sure if we would know if they would have tripped...

CONCLUSIONS:

1. TM3 has been commissioned for beam delivery after one week of delivery of UF to TITAN using a FEBIAD ion source in anode bias mode. Cathode mode was also used, so all functionality of the target except IGLIS current/voltage delivery through the mutlipin has been tested successfully.
2. TM3 still requires commissioning at high voltage with protons to be considered fully commissioned, this will be done July 2 2024 due to problems with the cyclotron.

 the five shielding blocks have been moved from storage area to ITE and is ready for beam delivery.

submitted WP# I2024-05-22--1

actived  WP # I2024-05-23-4

 TM3 with target UCx#44 was disconnected in ITE. 

TM3 UCx#44 after operation electrical check at SHC . see attachment.

Carla: Looks like the short on the cathode observed while trying to operate the FEBIAD in cathode-bias mode is still there. Will do investigations in the hot cell during disassembly.

Tm3 has been moved form ITE to SHC. the move is smooth.

A new gas system for FEBIAD operation was installed in ITE to enable us to use a calibrated leak which is attached to the target heat shield. This will allow us to control the quantity and purity of the gas going into the system, and to switch quickly between gasese and pressures.

The schematic of the system is attached. The use of the ballast container is likely not needed - it was originally included in case we want to run the system at pressures greater than 1 ATM. The roughing pump inlet limit is 1ATM, so it was envisaged to used the ballast container to reduce the pressure to that level or below before opening the system to the pump. But since it has been difficult to commission the system over 1ATM and this opens the door to several concerns about gas leakage, it was deemed better to keep operation below 1 ATM. This tank will likely be removed.

The storage tank was implemented because we are not sure if irradiated gases will be pulled out of the target lines when we pump on them, and so this was devised as a way to test that. The alternative is to have the exhaust of this pump go directly into nuclear ventilation by way of a plastic tube leaving the faraday cage, however this solution is also quite some work to implement. So the consensus was to start with the storage tank and sample it several times to understand what sorts of radioactivity we are dealing with, then make a decision about future operations.

This system has been tested offline using the development target UCx#44 and appears to work well. Unfortunately there were no protons available for this beam time so the gas sampling part of the system was not tested.

The operation of the rest of the system worked reasonably well. Beam disappeared when pumping out the lines and reappeared when re-opening the gas bottle. It seems that the storage container can be used to pump out the lines about 7 times before it gets up to around atmosphere, as was estimated based on volume. The pump can get the lines down to about 250mTorr as read by the pressure gauge DG2 on the module top, given about 30mins of pumping.

We did have some issue with the gauges, HV sparks destroyed both controllers and so we were unable to monitor pressures as we would have liked. It is possible one gauge itself is broken as well, to be investigated.

It may be that the gas leak we used was too small, but the idea of changing the pressure on the module by changing the needle valve didn't seem to work. This is not sure since we didn't have a reading on the pressure, but watching the ion beam as you turn the gas back on seemed quite binary. You would see no change until you had the needle valve fully open. This may be different with a larger leak, since this leak required about 1ATM in the lines to see anything. It is still not clear why this behaviour was different than the tests at the test stand, in which 0.5ATM of upstream pressure produced about 2nA of beam.

This system is considered a prototype and is not turned over to ops for operation. Further commissioning is required.

Tm3 electrical check without target is done. Everything is good including 2 x 5 pin connectors( all OL at 250 V to 60 KV and each other)  see attachment.

TM3 has been moved  from SHC to TCS.The move is smooth.

Tm3 electrical check with SiC#46 target  and HS line helium spray check at SHC. were done. everything is good. see attachment.