TH emergency exit hatch which is located on TH west end roof is opened and closed for functional check. The hatch works fine. The limit switch on hatch is in position. No obstacle on hatch way to the roof. 

ITE/ITW  are cleaned with vacuum canister. HV  cage inside and blue nylon insulators are wiped.  Garbage inside the pits are cleaned out.

Two shielding blocks  above vacuum station at TH west end were opened for inspection. Checked ITH:MP1, MP2 lubricant color and level through sight gauge on pumps. They are still ok.  Restored the shielding blocks.  Checked ITM:MP1 by decay tank (Mirror checked  sight gauge by north wall). Added lubricant to ITM:MP1 to middle level on sight gauge.  

Polyurethane  water cooling lines in ITE and ITW  HV shroud are replaced.  Both stations Ta, Tu, MSP, HS, Coil , EE in HV shroud are new lines.

Replaced 9 old turbo pumps from ITE/ ITW and  one 2A3M20 wire scanner from ITE are transferred to cyclotron tunnel for storage. It is TH RAD waste cleanup task in winter shut down.

 TM2 with Febiad target SiC#42 was connected in ITW.

 TM4 with target SiC#44 was connected in ITE on Tuesday.

17-Oct-2022 Comment by David Wang: On OCt 14th, Replaced a flexible hose on MP1S pump exhaust port,but did not solve the issue. High frequency vibration was sensed by hand on MP1S pump inlet and outlet ports. Pump height and position in pit are adjusted slightly in pit to reduce vibration. After, ITHCG2 and ITW CG4SA got a huge improvement in past 3 days. All back up line pressure are stabilized at normal operation status. Still, close watching on this issue is needed to ensure the present status is stabilized in long term.

The issue was returned after shielding block installation Monday morning at 8:30am. Investigated further,  I temporarily installed a turbopump used cooling fan on MP1s to improve pump heat dissipation. And a room fan is put outside on shielding blocks opening hole to increase air circulation into pit. Since then,  everything is perfect. All secondary turbo pumps current draw is around 0.5 to 0.6A which is the best.  I guess that short duo 10 pump life we observed in past could be related to high pump operation temperature in pit as well. We may increase the pump life if air circulation around the pump could be improved. A permanent solution is needed for it.

Feb. 16 2023: HV tests done on ITE station. Ramped up to 59kV but was not stable there, current draw was very unstable and was sparking every ~6mins. Ramped down to 58kV and it was stable there for 3 hours drawing 285uA.

Feb. 24 2023: HV tests done on ITW station. Ramped easily to 60kV with no sparking - suspicious. Has been stable at 60kV for 45mins with no sparks and current draw of 200uA. Cannot find any reason that things aren't connected properly...

vacuum pit ventilation upgrade was done last week. The jobs include: installed two industrial cooling  fans.  One is placed in pit on resin tan cover. Other one is placed on and opening to pit by shielding blocks.  They are installed for better air circulation in pit. Also,  2x two small 20W cooling fans are installed on ITH MP1 and MP1S to low the pump  operation temperature.  The result is positive. The ventilation status in pit meets the pump operation requirement (good ventilation and 40 Celsuis below) .  ITH CG2S 0.0 mtorr.  ITH CG2 0.26mtorr.

On Sept. 14 2022, a 10kOhm 30W resistor was installed in each target station faraday cage, in line with the HV bias supply. This was an effort to reduce the current draw from the BIAS supply and protect the power supply controls cards which have been repeatedly breaking due to HV sparks (we think). In the end we still broke cards after the installation, so it doesn't seem to have helped. See below for details on the electrical side:

At 30kV, HV currents are around 100-150uA, meaning the voltage drop over the resistor is around 1.5V. When operating at higher voltages, with higher current draw, the voltage across the resistor could be over 2V and we could get into a situation where it would have an effect outside the normal adjustments needed on the mass separator. We made this decision based on the fact that the power supply's setting resolution is on the order of 1 x 10^-4.

When the resistance of the water changes, this affects the current draw from the power supply and this in turn affects the voltage over this resistor. Based on some sample numbers of running times, there is not much variation in the current except from sparks and if there is some issue, like water leaking between HV and ground. During normal running, the voltage change across the resistor should be less than 0.5V during normal operation. This is on the same order as the 8 hour stability of the power supply.

Helium cylinder and  Argon cylinder are installed in both ITE/ITW faraday cages , regulator for outlet pressure are not set yet.

TO ITE :  Argon bottle size 14"L x 4"D with SV2 connected at pressure 900 Psi ( 70 bar )

               Helium bottle size 18"L x 7"D with SV1 connected at pressure 2000 Psi ( 130 bar )

TO ITW: Argon bottle size 15"L x 2"D with SV2 connected at pressure 1000 Psi ( 80 bar )

              Helium bottle size 18"L x 7"D with SV1 connected at pressure 2000 Psi ( 130 bar )

An Neon cylinder size 20"L x 6"D  at less than 100 psi ( <10 bar ) pressure stored in the cabinet of ITW cage without connection

two gas line connection pictures are attached here for reference.

MAA ASU test have been done following document 154779. All three tests in document are passed. DCR Jas has all test documents.

This test includes the functional test on TH emergency roof hatch which is located at the west end of TH roof. The hatch could be opened and closed properly from TH inside.

ITH:MP1 is replaced this morning due to its poor performance started yesterday afternoon. The general field in pit is about 260usv/hr. the contact field on pump is 2.0 msv/hr. New pump works good. Lubricant in pump will be drained next week. then motor will be removed. The pump body will be bagged and stored in silo area.

ITH:MP1S pump inside lubricant was changed today. old lubricant is dirty with dark color. they are stored in sealed waste oil jug and stored in silo area. Pump has been installed back and started. It works fine.

TM4 has been moved from SHC to ITW. Peter did the move. Travis helped on him.   The move is successful.

Broken TM2:TP2 has been replaced otday by a new TV-1001 nav pump supplied by vacuum group. replaced pump seris number:201281. new pump series number:IT23431008. TPs replacement history sheet will be updated by Frank. I will put comment on this e fault and let operator to close it.

 5 shielding blocks have been moved from ITE to ITW.

ITW/ITE pit general annual cleaning up were done. all concrete floor and TM equipment surface are vacuum  cleaned. HV cage inside and blue nylon insulators were wiped by paper.

Move completed, move went well.