Chad and I leak checked coil line(R,U) on TM2 at SHC yesterday. The leak detector was pumped down to 0.0Xe-9 atm.cc/sec before the check. Chad sprayed helium on the soldering joints connecting the cooling copper lines to the small holding blocks for the coil terminal(R,U).  After sprayed helium 2 seconds, I saw the leak rate on LD started to climbed up. The highest leak rate is 4.0xE-8 atm.cc/sec. It is a very positive response. We waited the leak detector pumped back to 0.0xE-9am.cc/sec, and tested again on the same joints. The result is same. Chad also sprayed helium on the R,U water blocks to check the C-seal. I saw a delayed tiny response on LD ( from 0.0 to 1.3xE-9atm.cc/sec). We think this tiny response is caused by the helium drifting to the leak soldering joint, but not a real C seal leak.

Chad and I leak checked the coil 1 circuit(R,U) after rebuilt coil line is installed on TM2 source tray. The pumping down on the circuit is very quick and smooth. The LD base lake rate 0.0xE-9 atm.cc/sec. Base pressure0.0xE-4 torr.

Chad sprayed lots helium on the R( coil 1+)and U(coil 1 -) water blocks. During  1 minute waiting time, there is no any response on LD. The R and U water blocks and C-seals are leak tight.

2018-02-27: Anders and I finished leak check on ITE primary and second vacuum vessel seals. LD connected to ITE BV2 valves between. LD, Base Leak rate 1.2 xE-9atm.cc/sec, base pressure 0.0XE-4torr. There is a leak has been found on TM4 service cap KF25 blank off. The o-ring on the blank off will be changed later. It is an easy fix . Other seals are good. The big T tank seal on secondary vessel is leak checked as well. It is still fine.  Helium pressure on TM4 water lines will be fulfilled at TCS to save dose.

2018-02-28 Leak checked ITW today, LD connected to ITW BV2 valves between LD base LR0.0XE-9 atm.cc/sec. base pressure 0.0Xe-4torr. There is leak has been found on exit module 1 service cap  on  topcover plate   o-ring. The leak is located on the south side of east edge on exit 1. This is the side module 2 is close beside. The leak rate is up to middle of E-8atm.cc/sec  range with 1-2 second helium spray. The leak and leak position are double checked and confirmed.  To completely fix this leak, the o-ring for top cover plate need to be replaced on service cap.It will be a major shut down job.  The  leak is close to ITW TP3 so it is less affect on beam line elevation vacuum.  Vacuum group experts will be consulted to see if we could leave it to next year shutdown.  Other seals are good including big T-tank seal on secondary vessel. TM2 source tray will be replaced this yea rso no helium pressure test on water lines is needed at this moment.

On May 30 Aaron, Chad and I removed the empty LP FEBIAD target from the SHC into the anteroom to attempt to find out the source of the cathode short observed online. The behaviour online was that a connection of several hundred ohms was preventing the cathode from being biased. The resistance was still enough to allow us to run in anode mode, which is what we did. I am not sure where the cathode short came from but there was significant sparking on this module when ops conditioned it (destroyed the gmov of the COIL power supply and the electronics for anode/cathode switching) and we have seen this cause cathode shorts before. The shorted behaviour did not go away when the target was cooled down, so I assume it was permanent damage to one of the insulators. This would be either the support insulator, the trident insulator, the gas line insulator or one of the tube retainer insulators.

Since the target didn't see protons, we decided to take it out of the hot cell and disassemble it to find which insulator was broken. Unfortunately, it appeared totally fine outside of the hot cell, no shorts could be found. We disassembled it anyway to look for issues but all we saw was a heat mark on the copper plates covering the coil, underneat the target (see attachment). We even shook the target quite a bit, and didn't produce a short.

Maybe there was a trace created on one insulator by the sparking, which oxidized when exposed to air and became insulating again? We didn't see anything obvious on the insulators, but I'm not sure if we would expect to.

No conclusions from this work.

Tom Gauss inspected  two target module lifting frames ITA0494-1997-01 and ITA0494-1997-02 yesterday. He certified the use of these two frames for 2025. Inspection tags have been issued and attached to frames. He has inspection record on them. 

Tom Kauss inspected target hall crane below hook attachment pins and plates ITA6550-01 yesterday. He certified the use of these pins and plates for year 2025. The inspection of these pins and plates was in Target hall crane annual check list. It was issued as a calibration index by Isaac Earle in 2022-Feb-08.  After inspection, The inspection tag  was issued. Tom has an inspection record on this job.

high voltage conditioning was carried out over the day up to 24 kV. i will leave it at 20 kV over night. Current is at 22 micro Amps, heaters off.

vacuum: IG1 7.7e-7

IG2 4.07 e-6

IG1sS 2.2 e-6

100 liters of high active water from HALCW system( mostly from s-tank and pipe lines closing to pumps) are transferred to holding tank in 2A tunnel. Transfer is smooth.  it is a preparation job for ITC:MP1/MP2 refurbishment.  water sample is passed to RPG for assay.

both high active pumps ITC:MP1 and MP2 are refurbished by RH group Maico and Peter. Pumps have been installed back to system with new inlet/outlet flange gaskets. high active water surging tank is refilled with water and pumps were primed. I asked operator to switch on pumps separately. Both pumps work fine. They are quiet and pumps discharging pressure is a little bit better comparing to before refurbishment. Nitrogen gas is injecting into system. O2 level is decreasing and R is going up.

2024-04-09: Joel.S checked pumps phase current draw: MP1 16.8 to 17.1A on each phase. MP2 17.0 to 17.2 A on each phase. They are normal. Pump body temperature are below 45C which is fine. 

 A 3/8 inch drain valve on return cooling line was replaced in ITE. In the meantime two 1/2 inch valves labeled FEBIAD COIL and ENTRANCE COLLIMATOR RETURN at ITW were replaced . The 2 inches leaky supply/return water valves in ITW were repaired as well. Pls check pics

attached here for detail.

On April 08th, all water lines in TM1 had been helium pressure tested(70psi) at conditioning station. No leak had been found.

I did a helium pressure test on heat shield circuit. The leak detector is concected to the TM4 primary vacuum system.The IG1 is 1.1xe-6 torr,PNG4 is 1.5 x E-6torr,and IG4 is 2.1 XE-6torr.leak detector base leak rate:0.0xE-9 atm.cc/sec, base pressure is 0.0x E-4 torr.Applied 80psi helium to heat shield circuit for 4 mins .There is no any response on leak detector during 4mins time. There is no pressure change during the test time. The heat shield circuit is leak tight.

Helium pressure 70 psi. 3 minutes on each circle untill LR on LD is balanced. Base leak rate on LD:0.0xE-9 atm.cc/sec.   The result:

A:   slowly to1.8Xe-8atm.cc/sec after 2 minutes and balanced there. 

B:   slowly to 2.0XE-8 atm.cc/sec after 2 minutes and balanced there.

C:  quickly response  to 3.1XE-8 atm.cc/sec and balance there.

D : slowly to 3.0X E-9 atm.cc/sec and balanced there.

All others including coil1, coil 2 ,MSP, EE, HS, window are perfectly leak tight. No response on LD.

 The leak rate on A,B,C,D are in low E-8 or E-9 atm.cc/sec range.  They should seal cooling water without leak.    No concern. 

Helium pressure test on TM4 HS water line at CS is finished. 80psi helium no leak. 

With Ta#64 installed , TM4 HS line was helium pressure tested at TCS. base leak rate is 0.0XE-9 atm.cc/sec. HS line tested leak rate is 3x E-7 atm.cc/sec on 5 minutes 50 psi helium testing. Leak check result wasgood at NHC by helium spray method. We decided to apply water to HS and all other water lines still. The vacuum status is closely being watched. So far, TCS pumping down trend is still good. HS line supply water valve was switched on and off couple of times at TCS IG1 1.15 XE-6 range, and no vacuum spike was observed. More information will be logged in during the TM4 and target conditioning stage at TCS. 

Helium pressure test on TM4 HS line at TCS is done.  LD base leak rate 0.0 xE-9 atm.cc/sec. Helium pressure 70psi. HS line had been helium pressurized for 5 minutes during the test. No response on LD. HS line with Ta#63 is leak free.

• TM2 installed in Conditioning Station
• Varian Leak detector connected directly to Target Module 2 Service cap.
• Vacuum draw in Target Station with both module turbo pumps
• Leak detector baseline normal (10^-4 Torr, 10^-9 Std cc/s He)
• Since no Source tray is installed, and tube heater supply conductor is blanked off in target enclosure, it was necessary to test both supply and return points.
• For each line tested, 80 psi He was connected, and waited ~2 min to for a response on the leak detector.
• Lines tested:
  • conductor D (tube heater), Supply -> no He response
  • conductor D (tube heater), Return -> no He response
  • conductor C (tube heater), Supply -> no He response
  • conductor C (tube heater), Return -> no He response
• Based on this leak testing, both supply and return lines of conductors C & D are leak tight under 95 psi He (80 psig He supply to vacuum)

I did the helium pressure test on Tube heater+ line this morning. The vacuum on CS and TM2 are very good. The base lake rate on leak detector was 1.7xE-7 atm.cc/sec. Base pressure was 0.0xE-4torr.  I applied helium to the "D"line .The test started from 30psi up to 80psi on both side "D" line.The base leak rate slightly changed to 1.9xE-7 atm.cc/sec during the test,but not base pressure. At this base leak rate level, No obvious leak had been found . See attachment pictures. The test will be repeated later when the base leak rate could be pumped into E -8 or E-9(the best) range.            

At CS, The leak detector is hooked directly to the TM2 top service cap. The base LR 0.0xE-9 atm.cc/sec, base pressure 0.0xE-4torr. Applied 80 psi helium to TM2 tube heater +(D) line . During 3 minutes applying time , I did  not see any tiny change on LD readings. The line is perfectly vacuum sealed.  See attachment pictures.

The TM1 HS line is  pressure tested this morning with 70 psi helium  at CS. No response has been found on leak detector.