Ta#37 has been moved from the south hot cell into the storage vault. The target is in pail #89 and in spot 6A in the vault. It was 840uSv/hr upon removal from the south hot cell. There are 7 free spots left in the vault.

West target station is setup to use argon for tank venting.  There is 1200 PSI remaining on argon bottle in electrical room.  That is sufficent for venting west target station to atmosphere twice.  ISAC Operations has been previousily contacted and their procedures for venting remain the same except that they can not rely on ITW:CG4S to determine when at atmospheric pressure.  I have asked them to contact me if an unscheduled vent is required.

Today a leak check on TM1's external seals and the heat shield line was completed by David Wang. After 16 hours of the turbo pumps running on the conditioning station stations pressures were 3.6 x 10^-6 T, 1.2 x 10^-5 T, and 1.8 x 10^-6 T for the containment box, secondary vacuum, and service cap respectively. This is a significantly quicker pump down after the cross with small turbo pump was installed on the vacuum vessel. The base pressure of the leak testing cart was 0.0 x 10^-4 T and the leak rate was 1.2 x 10 x 10^-8 atm cc / sec. There was no response from the external test where the module was sprayed with helium. The heat shield line was pressurized with 80 psi helium which caused the leak rate to climb to a maximum of 2.5 10 ^-8 atm cc / sec but dropped to 1.9 x 10^-8 atm cc / sec and was stable there, the total test time was 2 minutes. This test was repeated another time and had similar results.  These results although showing a slight increase in the detected leak rate are withing acceptable and indicate that the module is leak tight. 

At 9:30 the HV check and conditioning started (~17 hours turbos on), the secondary vacuum, containment box and service cap had the following pressures in Torr respectively, 1.0 x 10^-5, 3.2 x 10^-6, 1.6 x 10^-6.  The voltage was steadily raised with virtually no current up to 28.5 kV which was achieved at 9:50. When raised to 30 kV the current increased significantly to ~300 uA and a large amount of sparking occurred. The voltage was dropped to 0 volts for 2 minutes and then was returned to 30 kV at 10:03, the current draw was around 200 uA and climbing. After a few sparks and time the current had dropped to 120 uA. This indicates that the module is still conditioning and matches what is observed by the control room when the module is in ITW. The module was deemed acceptable for this current run and was then vented with argon this took about 2 hours.

The module was then remotely moved from the conditioning station to ITW. When first attempting to transfer the controls to the remote control room they were not transferred and when testing the up command as per standard procedure the module dropped down slightly. David Wang went to lock out the target again and the controls were successfully transferred. A note of this was made in the log book. Apart from this the move went smoothly.  

 On August 22nd TM1 was vented with Argon in the conditioning station. It had been pumping with just the roughing pump over the weekend so the UCx#2 target would not be exposed to oxygen. The move went without incident and took roughly an hour to complete. Once at the hot cell the panel was removed by Tom Lyth and a leak check completed with Bevan, David Wong, Grant Minor, and Tom Lyth present. The connections to source tray were checked starting at the top. Each connection was checked on either side of the VCR and at the center through the hole in the nut. For both connections on the source tray there was no response from the leak cart which was at a pressure of 0.0 x 10^-4 T and had a baseline leak rate of 0.0 x 10^-9 atm cc / sec. The leak check then proceeded to VCR connections on the Target. A leak was found on the upper VCR connection of the target and was repeatable. This leak was detected at the hole of the VCR nut connection by priming the line with helium and placing it next to the hole in the VCR connection. Response time was between 5 and 10 seconds to a maximum of 2.6 x 10^-8 atm cc / sec. The lower connection also appeared to have a small leak rate of 4.4 x 10^-9 atm cc/ sec but could be a result of helium drift. Unfortunately the target is not design to be repaired with manipulators and required the target to be removed from the south hot cell and repaired in the anteroom. The anteroom was prepared for the target by lining much of it with plastic so to prevent the spread of contamination. Once the target was in the anteroom it was leak checked again, the base pressure was 0.0 x 10^-4 and the base leak rate was 0.0 x 10^-9. A response from the upper connection again was detected in the 10^-8 range but no leak was found in the lower connection. It was attempted to tighten the joint to stop the leak but this caused it to increase to the 10^-7 range. This increase in leak rate is as expected from past experience because copper gaskets are used rather than silver plated ones. The heat shield cover was loosened and the gaskets from from both joints were replaced with the silver plated ones. The target was then leak check and passed with no response once again with a full pump down. The target was had an electrical checked with the megger and was within spec. The target was then placed in an argon bag and returned to the hot cell. The bag was damaged went placing it in the hot cell and there were not any acceptable options for leaving the target over night. The target was removed and and placed in 2 bags filled with argon for over night.

On August 23rd the target was removed from the argon bags that were still inflated and returned to the hot cell. The target was re-installed on the target module by Grant Minor, Tom Lyth, an Bevan Moss. One VCR gasket fell off during the first attempt and it appeared that the right target leg may have been slightly bent at some point. Other than that the installation went smoothly but slowly. The heat shield line was then leak checked once again by Grant, Tom, David, and Bevan and no response was detected from the source tray or target VCR connections, the base leak rate and pressure once again achieved the minimum detectable levels. The target module passed the electrical check with the megger, this test was completed by Bevan and Pierre Bricault. The module was then moved from the south hot cell to the conditioning station. Roughing was started at 3:00 and the turbo pumps were turned on at 3:45. The module was left to pump over night.     

 A leak check was performed on the module when it was in the conditioning station today. There were no external leaks found. When the coolant lines were check a small leak was found in the heat shield circuit. Base leak rate was 6.7 x 10^-9 atm cc /sec and rose to 4.1 x 10^-9 atm cc /sec quickly (~3 seconds) and remained there for the 2 minute test. The remaining lines had small responses as usual but the highest response was in the low 10^-8 atm cc /sec range. The pressures were recorded as 1.2X10^-6 T, 2.7 x 10^-6 T and 1.1 10^-5 T in the service cap, containment box, and secondary respectively. The module was then vented with argon which took ~1.5 hours, vessel was pressurized to ~ 1 psi. A panel was then removed to leak check the feed through stem of the heat shield pressure of the line was recorded to be 0.0 x 10^-4 T and a leak rate of 1.3 x 10^-8 atm cc/sec was achieved. The stem was sprayed and no response was found. Swipes of the were taken of the panel (150 counts) and the containment box (3000 counts). The panel was then returned and the vessel roughed out for the weekend, it will be vented and moved to the south hot cell on Monday where the VCR fittings will be checked again and then tightened.  

 Pump down in the conditioning station started at ~2:40 for rough down. The turbo pumps were turned on at ~3:30 and at 3:52 the pressures were reading as follows:

IMG in the containment box 9.2 x 10^-5 T

IMG in the secondary 2.0 x 10^-3 T

ION in the service cap 4.6 x 10^-5 T

Note that the cross has been installed on the vacuum vessel which now includes a turbo pump and the IMG 100.

Leak check will occur tomorrow.

 TM1 with UC#2 had the target installed, the heat shield line was pumped on and achieved a vacuum of 0.0 x 10^-4 Torr and a  leak rate of 0.0 x 10^-9 atm cc / sec with no response when sprayed with helium. An electrical check was completed by David and myself all values were withing tolerance.  The module was then moved from the south hot cell to the conditioning station where it will start pump down. The move was uneventful every operated as it should and there were no crashes minor or large. It was attempted to fill the containment box with argon prior to closing it but assuming that didn't work I estimate the target was exposed to air for a total of ~4 hours during installation and move. 

UCx #2 has been installed onto TM1.

Installation went well except the left leg got bent slightly sometime between testing on the jig and installation onto the module (probably during removal for the argon filled bag). Leg was gentle offered into place and its clearance with the heat shield double checked with both a mirror and goose neck camera. Leg was close to ther heat shield but appeared to have clearance. Anders and John Wong viewed this and deemed it ok. Video images of this clearance were recorded.

Leak checking was also completed successfully:

Base pressure on the leak detector was a constant 0.0 x 10-4, Stable leak rate was an unwavering 0.0 x 10-9.

Both heat sheild circuits were checked twice (starting with the highest gland) and sprayed with a 2 second burst of helium into the test hole in the nut. No reponses were seen after 1 minute an any of the circuits.

Bevan Moss and David Wang performed an electrical check which they relayed to me that the module with target installed had passed.

 TM1 with Ta #37 target was moved from ITW to the south hot cell. The rotation of TM1 may have been off slightly during the final removal from ITW but it was minimal. Entry into the south hot cell went with out incident. This was my first time moving the module without the presence of Travis Cave. 

TM#1 with Ta#37 has been moved from the conditioning station to the the west target station, move went well.

 TM1 has received the Ta#37-LP and has been pumping since thursday. This morning the pressure gauges read, IMG1: 1.6x10^-6 T and IG1: 7.4x10^-7 T.

The high voltage power supply has been connected to all high voltage feedthroughs and the voltage raise to 42 kV. 

High voltage conditioning started around 20 kV and after few minutes we were able to go up to 40 kV. 

The pressure increases on both locations, IG1 went up to 8.1x10^-7T and IMG1 went up to 1.8x10^-6T.

The module is good to go. 

Tm#1 with Ta#37 moved from the south hot cell to the conditioning station. Move went well.

TM#1 has passed the the electrical check.

TM#1 has been moved from the Conditioning Station to the South Hot Cell for the installation of Ta#37.

Ta#35, in pail #88, has been place into spent target storage, in spot 6C. Upon removal from the South Hot Cell it was 411mSv/hr our hottest target to be placed into storage to date. There are 8 free slots for targets left in the vault.

Bevan Moss wrote:

Over the period of July 20-21st TM1 had several repairs completed and tested. The easiest of the repairs was the installation of a gasket and a blank off. The next repair was to replace the 2 oring on the side panels that were removed for inspection and repair. The instrument panel oring was replaced again and the previous one measured. Both were found to have the correct diameter of 0.131 inches for the seal groove. When attempting to cut the thermocouple line back to an acceptable distance it detached from the stainless tube running down the high voltage chase. It was discovered that it was only being held in place with heat shrink and that the bend consisted of a hand made copper tube that was flared slightly, a truly poor electrical and mechanical connection. Also discovered was the thermocouple wire was left in the tube, this too was removed. The stainless steel tube was then secured to the tube heater (C) lines with a PEEK tie wrap. The port where the thermocouple line was then blanked off. The extraction electrode and mounting plate feed through stem repair went as practiced and no unexpected events occurred. One thing of note is that because the lines are twisted and some of the tube was removed the quick connects are no longer facing the same direction they were before. During these repairs the Ion gauge screen contacted a filament and caused a fault, this was repaired by edi who rotated the gauge. Roughing was started at ~10 am on July 21st and the turbo pumps turned on at 10:45.  At 13:20 all of the lines and external seals were tested and no leaks were found. The module was at a pressure of 2.9 x 10^-5 Torr (IMG) and 1.4 x 10^-5 Torr (ION). The leak test cart was at a pressure of ~2.7 x 10^-2 Torr and a leak rate of 1.1 x 10^-2 atm cc/sec for the external leak test and the repaired lines. A small response was found in the Tube heater (D) where the leak increased to 2.1 x 10^-8 atm cc/sec. The leak test cart would then no longer drop below 1.9 x 10^-8 atm cc/sec and there was no response measured for lines C, B, and A. Over all very positive results! After 6 hours of pumping down the pressures were 2.0 X 10^-5 Torr (IMG) and 9.7 x 10^-6 Torr (Ion).

 I again checked the TM this morning (July 22) at 10:00 am (24 hours of pumping), There is no external leaks carts pressure was 0.0x10^-4 Torr and leak rate was 0.0X10^-9 atm cc/sec. The IMG gauge was reading 6.8 x 10^-6 Torr and ION gauge was reading 3.1 x 10^-6 Torr. The lowest we have yet to record on the IMG gauge was 6.6 x10^-6 Torr and that was when the ION gauge was reading 1.2 x 10^-6 Torr and there were several leaks. This is a very good sign. I will continue to check the vacuum throughout the day. 

One more thing of note is that the copper feed thru stems have a design flaw, the holes for the locating pins are too large. As such a custom step pin had to be made. It work functionally the same but is not as intended.

Over the period of July 20-21st TM1 had several repairs completed and tested. The easiest of the repairs was the installation of a gasket and a blank off. The next repair was to replace the 2 oring on the side panels that were removed for inspection and repair. The instrument panel oring was replaced again and the previous one measured. Both were found to have the correct diameter of 0.131 inches for the seal groove. When attempting to cut the thermocouple line back to an acceptable distance it detached from the stainless tube running down the high voltage chase. It was discovered that it was only being held in place with heat shrink and that the bend consisted of a hand made copper tube that was flared slightly, a truly poor electrical and mechanical connection. Also discovered was the thermocouple wire was left in the tube, this too was removed. The stainless steel tube was then secured to the tube heater (C) lines with a PEEK tie wrap. The port where the thermocouple line was then blanked off. The extraction electrode and mounting plate feed through stem repair went as practiced and no unexpected events occurred. One thing of note is that because the lines are twisted and some of the tube was removed the quick connects are no longer facing the same direction they were before. During these repairs the Ion gauge screen contacted a filament and caused a fault, this was repaired by edi who rotated the gauge. Roughing was started at ~10 am on July 21st and the turbo pumps turned on at 10:45.  At 13:20 all of the lines and external seals were tested and no leaks were found. The module was at a pressure of 2.9 x 10^-5 Torr (IMG) and 1.4 x 10^-5 Torr (ION). The leak test cart was at a pressure of ~2.7 x 10^-2 Torr and a leak rate of 1.1 x 10^-2 atm cc/sec for the external leak test and the repaired lines. A small response was found in the Tube heater (D) where the leak increased to 2.1 x 10^-8 atm cc/sec. The leak test cart would then no longer drop below 1.9 x 10^-8 atm cc/sec and there was no response measured for lines C, B, and A. Over all very positive results! After 6 hours of pumping down the pressures were 2.0 X 10^-5 Torr (IMG) and 9.7 x 10^-6 Torr (Ion).  

Move completed, move went well.

Tm4 w/ Ta#36 has been vacuum leak checked using the standard leak check procedure.

At 1:45pm RH was contacted to notify them that TM4 is ready to move.

Ta36 was check by Maico and Chad.It was then carried into the anteroom.From the anteroom it was transferred into the south hot cell.