The target was inspected today.

It was found that the target tube had broken on both sides of the centre block in the region that contain target material. The Ta-foil heat shield was removed from the let side tube to allow inspection.

Photos can be found on DocuShare:
https://documents.triumf.ca/docushare/dsweb/View/Collection-9357

By pressurizing the water lines with 70 psi helium David and I detected a major leak on the Coil 1 circuit. The response maxed out on the leak rate on the leak detector and we could also see a pressure increase on the leak detector. ISAC controls reported a change in vacuum at the same time (link).

The Heat Shield and Coil 2 circuit was checked before we moved to Coil 1. No response was detected on these two circuits. We would like to check the remaining circuits as well, but this cannot be done today due to the large amount of helium still present. The remaining circuits will have to be checked tomorrow morning.

All water circuits except Coil 1 were leak checked by David and Anders. No obvious signals were detected except some small possible responses. See attached notes for details.

The SiC#29 CTL target has been taken apart with the help of Isaac and Chad. Electrical measurements were done between Target and Heat Shield as the target was disassembled. Work was done on October 2nd, 4th, 7th and 8th.

The megger showed about 30kOhm at 50V with the following changes

• Bolts for CTL block loosened
• Above bolts removed
• CTL block pulled away from Heat Shield
• CTL block removed
• Heat Shield lid removed
• Bolts for target removed
• Shims between target and insulators

The megger showed about 50kOhm at 100V with the following changes

• Target removed. Measured between cathode restraint and HS.

The megger showed OL at 540V with No 3 insulator removed. A measurement on No 3 insulator while it was sitting on the HS showed 70kOhm at 120V confirming that the insulator can no longer hold voltage.

While taking off the coil retainer plate, Chad noticed that all bolts were not tight.

Photos are available on DocuShare.

as measured today in the electrical room by David and Anders

The conductance check on the electrical check was found to be outside of accepted values for the TBHT at 7.0 mOhm. A successful attempt to reduce the conductance was made by re-tightening the bolts on the TGHT legs in the SHC. Grant operated the manipulator and torqued the bolts to about 1/8 of a turn with the air ratchet. The conductance across the TGHT (A-B) could be improved from 7.0 mOhm to 6.2 mOhm by re-tightening the bolts. The value is still somewhat higher than usual, but was deemed to be acceptable. Measurements attached.

with TM4 in ITW as measured today in the electrical room by David and Anders.

with TM4 in ITW as measured today in the electrical room by David and Anders.

The target was inspected by Chad and Anders in the Hot Cell. Electrical megger tests were done during the assembly. It was found that Insulators No 3 (ITD0311) and No 2 (ITD0310) failed to hold voltage after the run.

EE to HS was measured OL at 1000  V.

Photos can be found on DocuShare

The Target Assembly was inspected with Chad, Jens Henning and Anders today.

• The Target Container was broken.
• Material was deposited on the Heat Shield around the Target Center Block
• Material was deposited on the IG-LIS source.
• Electrical checks to ground (HS)
  • The Extraction Electrode passed the electrical check at 1000V
  • The Exit Electrode (c) held only 40V at 22 kOhm
  • The IG Electrode 1 (f) held 250V at 390 MOhm
  • The IG Electrode 2 (g) held only 40V at 22 kOhm
• IG 1 and IG 2 both held 250V at 450 MOhm to Exit Electorde (c)
• No spark marks were observed on the 9-pin connector

See photos of the inspection on DocuShare

David W. has installed two SST Proteus flow meters, model OV7006FTA32, on ITW Heat Shield and Coil. The flow meters are connected to a power supply and a data logger in the electrical room.

The Heat Shield flow meter has SN 00278112 and is on the Black wire pairs and connected to CH3 & CH4 on the logger.

The Coil flow meter has SN 00278113 and is on the Green wire pairs and connected to CH1 & CH2 on the logger.

The first channel (CH1, CH3) is temperature in degrees Celcius and the second channel (CH2, CH4) is flow rate in liters per minute.

A camera has been placed on the logger.

Flow rates today (2014-04-04):

HS        8.2 - 8.3 lpm
COIL    8.0 - 8.1 lpm

Calibration sheets

UPDATE 2014-04-11: Corrected HS to CH3 & CH4.

PDFs of temperature and flow traces are available on DocuShare

Monday, April 28, 2014, 09:27. p+ off since 8:20

Tuesday, April 29, 2014, 09:28: p+ 30 uA

Monday, May 05, 2014, 10:49: p+ off since 8:39
(Downloaded data and updated traces on DocuShare)

 Wednesday, May 14, 2014
(Downloaded data and updated traces on DocuShare)

Coil not used on TM1. Data and plots on DocuShare

Friday, June 13, 2014, 10:30. ITE receving p+

 Monday, June 16, 2014, 09:30: p+ off for maintenance day

 Thursday, June 19, 2014, 16:14: 10 uA p+ on ITW

Tuesday, July 08, 2014, 10:32:

Data uploaded to DocuShare

When the Containment Box was opened today by Chad for a target change, we found the conductor insulator block B (ITD0054) to be broken close to the right TGHT terminal. Chad was nevertheless able to remove the target. See DocuShare and attached file for photos.

An attempt to replace the insulator will be made tomorrow with a spare.

A small sticky piece, likely off plastic material, was found next to the left main source tray insulator. The piece was removed from the Containment Box. See link above and attachment for photos.

See attached pdf and DocuShare for more photos. It may be possible to clean some of it from the Ground Electrode.

Anders Mjos wrote:

When the Containment Box was opened today by Chad for a target change, we found the conductor insulator block B (ITD0054) to be broken close to the right TGHT terminal. Chad was nevertheless able to remove the target. See DocuShare and attached file for photos. An attempt to replace the insulator will be made tomorrow with a spare. A small sticky piece, likely off plastic material, was found next to the left main source tray insulator. The piece was removed from the Containment Box. See link above and attachment for photos.

 The two insulators ITD0053 and ITD0054 was replaced this morning by Chad. Photos on DocuShare. All bolts torqued with torque wrench see attached PDF for values.

 See attached PDF. The object is not accessible with only the front panel removed. Photos on DocuShare.

Anders Mjos wrote:

See attached pdf and DocuShare for more photos. It may be possible to clean some of it from the Ground Electrode.

 Chad cleaned the GND electrode yesterday June 26th - see attached PDF. Photos on DocuShare.

Wednesday, October 14, 2014

 The BIAS voltage was brought up between 1:30pm and 5pm. Sparks tripped the BIAS power supply at voltages between 20 - 24 kV. Multiple attempts were made. The current was about 50-60 uA.

Wednesday, October 15, 2014

Temperature in the cooling circuit is too hight to do a HV test. The cooling circuit was started, but shuts off after ~10 m

Thursday, October 16, 2014

David and I found that the fans on the cooling unit on the roof did not run and that the compressors get hot and likely trip on over temperature protection (hot to the touch). We found the manual in the control panel of the unit.

10am: HV to 20kV before a spark tripped the PS. Current at 40 uA - resistivity at 11.9 Mohm

5pm: HV to 20kV before fluctuations in current, then a spark tripped the PS. Current around 40 uA. Resistivity 12.6 Mohm

Friday, October 17, 2014

8am: Staging did not start over night. TS5 temp is 31 deg C, which would have tripped power supplies. Reset and enabled staging.
The system increased staging until all 3 compressors were running.
9am: Cooling supply temperature reached ~3 deg C. Disabled staging and switched off all pumps
2pm: Switched off water circulation for the weekend.

NOTE: If there is a problem with the chiller unit (ie Fault 1 or Fault 2), a power cycle may reset the VFDs for the fans and clear the problem. To do so it is necessary to wait long enough for the VFDs to power off completely. The display will first start to flash before going dark. Wait another few seconds before powering the system back up. The chiller unit is located on the ISAC I Penthouse Roof.

A service tech from Daikine was on site today and has cleaned the chiller unit. In the process he also cycled the power which returned the operation back to normal. The tech provided us with manuals for the VFDs. These can be consulted on DocuSharefor looking up error codes.

Fault 1 refers to unit 1 and Fault 2 to unit 2.