TM3 and UCx#44 ran in ITE but issues with the cyclotron prevented proton beam delivery. Nonetheless, the target was heated and provided stable beam to TITAN as well as for tuning and some tests.

Results of inspection of TM3 module after run:

The module looked pretty good. There were no marks on the polished surface of the containment box, next to the water blocks, that were visible. But we didn't remove the box, only looked with the camera and it was visible by turning the module. So some things may have been hidden. There were some black marks on the door, near the bolts that hold in the handle (see attachment). This seems a very unlikely spot for sparking as the fields should be considerably lower than at the target handles, lower down. Maybe the spots are from oil left on the door that had a chemical reaction? There is one very faint matching spot on the top of the copper trident connector, but it doesn't look much like a spark mark. The other two marks have no corresponding mark on the source tray. There were no marks on the ground electrode, or anywhere else on the source tray. There was a scuff on one of the trapezoidal insulators, but it could have happened during installation.

Results of inspection of the target after run:

The FEBIAD target developed the same cathode short we have seen on almost every FEBIAD we run online - a high resistance short from cathode to HVC that prevents voltage on the cathode. This time the short remained after cooling the target, and David measured 208kOhms with the ohmmeter on the module top (11kOhms with the megger). We used a multimeter in the hot cell to test after the target had been dismounted and we found no short. So it must be related to either the position of the target (upright vs face down) or time (a conductive trace on an insulator oxidizes and becomes non-conductive again) or some pressure/shaking during the de-installation.

There weren't many marks on the target - a faint mark near where the faint mark on the copper trident was observed, some marks on the EE which had no counterparts on the ground electrode. See pictures.

electrical check  on TM4 UCx#45 target at SHC after operation is done.   see attachment.

TM4 and TiC#7 target electrical check and HS leak check at SHC after target installation have been done.  all results are good. I will attach the checklist when printer is back to work.

TM4 HS line was helium pressure tested at TCS this morning. No leak. Also i leak checked TM4 top all air to  vacuum seals at TCS. Everything is good.

TiC #7 is a febiad target.TM4 top has been configured for febiad target. checked pin 2-2 to bias, target ,and chassis at 250V. they are all OL.  

 New spring idlers were installed onto rotational chain drive for SHC roof. Operation ran smoothly in both directions to full limit. Chain was noted to have adequate slack when not on driven side. Periodic checks to confirm operation will continue in the following months to guarantee proper operation.

Tm3 was moved from ITE to TCS this Tuesday, then to SHC  this morning. Both moves are successful.

ABCD is short to 60KV bias. Othjer are ok.  see attachment.

Found afterwards that this short was due to sparking through the multipin wire insulation where the wires pass behind the TBHT block "C". See fault 17265.

 TM3 with replaced target TiC#8 has been checked on SHC before moving to ITW. Pls see attachment

With the new TiC#8 target installed on TM3, there was a ~7kOhm connection between TGHT/TBHT (A/B/C/D) and HV common. The standard electrical check on the module showed standard values, so it was assumed the problem was inside the target.

Started removing bolts/water connections one by one to see if any of them had an effect on the measurement. Found that disconnecting the multipin on the target from the mating connector on the source tray resolved the issue. Determined that the only way this could happen is if a spark cut through the insulation covering the multipin wires. Because of the way they are routed, they can touch the water lines and they are definitely touching waterline C, TBHT-. We do not typically check continuity of multipins to all water lines, just to HVC, so did not see this in the standard electrical check. Measurements verified that pin 2-4 was touching water line C, creating a short from TGHT/TBHT to HV common when the multipin connector is attached, since the pins are shorted to HVC inside the connector when they are not used.

Issue was solved by removing the target into the ante room, removing connector 1 all together since it was not used, and removing the grounding on the other pins, leaving only pin 2-2 connected for the anode.

In future we will change the IGLIS wiring so pin 2-4 is not used, and redesign the cable routing so it cannot touch the blocks. For the immediate term, we will add to the electrical check a check of each pin to TBHT/TGHT/COIL.

 Ta#67 Target loaded onto TM2

Leak check passed

Electrical test passed after loosening off target electrode conductor screws, and torqueing by feel 

 TM2 with new target Ta#67 had been electric/leak checked before moving to ITE. See attachment pls.

TM4 has been moved from  SMP to SHC. The move is smooth.

 New target Ta#68 is installed on TM4 and be leak/electric checked. Pls see attachment.

 TiC#7 Target Removed from TM4. - Photos attached 

TiC#7 Currently sitting in SHC waiting for disposal 

 Target Ta#68 loaded onto TM4 

-leak check passed

-Target electrode conductor screws torqued to 130 in-lbs

-electrical check passed

Containment box cover re-installed 

photo attached 

TiC#7 failed after two weeks of operations - measurements in the electrical room indicated that the negative side of the CHT was broken (35kOhms to the rest of the target). This was likely due to a large number of proton trips during this target run. At every trip I could see the CHT voltage getting higher and more unstable. This cahnge in voltage was reflected in the unstable anode current and fluctuating RIB beam intensity, as a direct result of the fluctuating power on the CHT. The break was confirmed in PIE, loosening the screws caused the target container to come off without the cathode. Otherwise nothing unusual was seen. The anode wire connections seem very robust, dragging the target around with the multipin disconnected, flipping it up and down, etc and the anode wire stayed attached. Though we saw lots of outgassing on this target, things looked the normal level of dirty. There was no buildup between PE and EE.

Nb#10 never worked online - repeller had no effect on the beam and one of the RF wires was touching HVC. Max 60pA was seen on the source cup. See notes here ITW-TM2-Nb#10/#11-LP-IGLIS  (Web view)

Target was handled roughly after use - kicked around in NHC for a long time, then loaded into a pail (multipin had to be dettached for this) then moved to SHC, unloaded from pail, then plates covering the RF electrodes had to be pried off. Lots of knocking and shaking.

Theory was that the repeller wire was disconnected. But found it not obviously broken, had good continuity from the ring tongue to the end of the wire pulled out of the multipin, even after all the abuse. Same for the RF (from the end of the electrode to the end of the wire pulled out of the multipin). Did find some of the multipin wires were flaky - if moved around they showed intermittent shorts to HVC. But not clear if this is from the rough handling afterwards or not. The problem was not in the module since NB#11 ran immediately afterwards with no issues. Most likely culprit seems to be the insulation beads on the wires. Should look for more robust insulation solutions. On the other hand, the connections of the wires to the electrodes seems very good.

Still not sure why no effect of the repeller was seen. Could be a intermittent break/short, though this seems unlikely. Maybe the connection in the multipin was not good? I did not get a chance to inspect that.

TM4 has been moved from SMP to SHC. The move is smooth.

September 5, 2024 -AT

• Plastic and clean target tray added to SHC 
• TM4 moved to SHC 
• TM4 containment box cover removed

September 6, 2024 - AT

• Ta#68(Spare) removed from TM4 onto clean tray 
  • top left mounting bolt fell under source tray in containment box - unretrievable
• Ta#68(Spare) moved out of SHC via toolport door 
  • SHC lift table was lower than tool port tunnel by 2". Target-on-Tray slipped back onto lift table when trying to drag it up to the tool port. Target bounced out of one locating pin, but stayed within boundaries of the tray 
  • Water also leaked out from the VCR fitting and on to the SHC lift table, and toolport. 
• Target-on-tray slid into a clean plastic bag, and then into a plastic box. 

 September 9, 2024 - AT

• Ta#68(Spare) taken out of plastic bag and water drained from waterlines
  • Target was rotated in every direction several times until no more water poured out from the VCR joints
• Ta#68(Spare) put back in box without the bag (to promote evaporation) 

September 9, 2024 - Aaron Tam 

• Water from waterline found puddled on source-tray and containment box. 
• Water was wiped up as much as possible, but likely still in containment box 
• leaving to dry overnight
• Target inserted into Hotcell with nuts for the parasitic target. 4/4 socket nuts installed on upstream flange, and 3/4 installed on downstream flange

September 10, 2024 - Aaron Tam

• TiC#9 HP-SIS installed onto TM4 
• Leak check passed after retightening VCR joint
• Target Electrode Conductor screws torqued to 130 inch-lbs 
• Electrical test passed 
• Containment box cover reinstalled

Photos attached

 TM4 with new target TiC#9 Surface installed in SHC was leak/electric checked before moving to TCS. See attached pic pls.