The uncovered VA8 section of beam pipe was surveyed in preparation for a visual inspection and some laser scanning.

Fields around the East and West elevated ledges of the beam pipe were around 100 uSv/hr. The pole monitor registered around 2mSv/hr on contact with the beam pipe indium joints.

------------------------

April 09:

We took recordings of the VA8 section using the remote pole camera () and took photos as well (attached).

The paddle wheels, o-rings, and shafts were changed at the T2 cooling package for the following sensors:

• B1A:T2:FGCOLA
• T2CS:FGTGT
• T2CS:FGDEM
• T2CS:FGSEC
• T2:FGCOLB

No major issues were noted. Some residue was observed upon cleaning the sensors. No leaks observed when turning water isolation valves back on.

Two of the sensors, FGCOLA and FGTGT, experienced anomalies during the previous beam run which resulted in faults (#14656 and #14501, respectively). The system is not yet running in order to confirm whether the replacement has resolved the faults.

The schematic which contains these sensors is TBP0902.

The paddle wheels, o-rings, and shafts were changed at the T1 cooling package for the following sensors:

• B1A:T1:FGCOLA
• T1CS:FGTGT
• T1CS:FGDEM
• T1CS:FGSEC
• T1:FGCOLB

No major issues were noted. Some residue was observed upon cleaning the sensors. No leaks observed when turning water isolation valves back on.

The schematic which contains these sensors is TBP0902.

The four o-rings on top of the T1 cooling package water reservoir were changed as per the recommended 5 year replacement schedule.

The four o-rings on top of the T2 cooling package water reservoir were changed as per the recommended 5 year replacement schedule.

All filters were replaced for the T1 cooling system: demineralizing resin circuit, target water system, and M15.

All filters were replaced for the T2 cooling system: demineralizing resin circuit and target water system.

The T1 cooling system was refilled with water via the expansion tank until the tank level read approximately 38 cm.

The system pump was restarted. All sensors displayed acceptable nominal values. Demin flow was tuned to 1.0 gpm.

 No leaks or abnormalities observed - system running normally.

NOTE: the needle valve for demin flow control adjustment was behaving strangely - it needed to be tapped when loosening to increase flow in order for results to be observed. Suggest replacement next shutdown (2023) - a calendar reminder was set to do this.

The T2 cooling system was refilled with water via the expansion tank until the tank level read approximately 38 cm.

The system pump was restarted. All sensors displayed acceptable nominal values. Demin flow was tuned to 1.0 gpm.

No leaks or abnormalities observed - system running normally.

The T2-MK2 target was moved from the target station to the storage area (position 3). Upon removal, it was measured with a pole monitor at 0.5 m to be 960 mSv/h.

The T2-MK1 target was moved from the storage area (formerly position 4) to the target station. Services were reconnected in order to prepare for normal operation.

Diagnostics group (Shengli Liu) noted a lack of connectivity between control panel and T2 Protect Monitor via the high voltage cable. Upon inspection it was noted:

• The cable was very brittle due to radiation exposure and it was cracking in multiple places
• In the SHV connector, the pins were slightly bent (bending them back into position seemed to rectify the connectivity issue).
• The cable was bent at the strain relief junction

RH Group has advised that Diagnostics replace the entire cable as soon as possible. For now it appears to be working.

The beam blockers for M9 and M20 were actuated, and vacuum was monitored to ensure no disruptions. Both actuation tests were successful. Motion was observed and no abnormalities noted. Cabling and air connections checked: OK.

Note: there was a safety interlock issue with M9 which prevented actuation - a relay or fuse was temporarily removed from the safety system ~10 years ago but it was not replaced. It was replaced for the purpose of this test, and then removed again.

An attempt was made to actuation the T2 profile monitor, however it showed up in EPICS as being not present. Furthermore, the "Remote" indicator light on the physical controller was not lit up despite the switch being in remote mode. The limit switch indicator light was working.

Upon troubleshooting with Erwin Klassen, it was determined that a jumper was missing on the profile monitor control connector (on the target end, rear of bulkhead). The jumper shorts pins A and G on the mil-spec connector on the controller end, which is for 120 VAC supply, to indicate that the device is connected. T1-MK1 was checked - this jumper was present on T1-MK1, across pins E and F of the mil-spec connector, but was not present on T2-MK1. Otherwise the connectors were identical. It is suspected that it was accidentally omitted during maintenance in the past. Regardless, a new jumper was soldered in-place on T2-MK1 across pins E and F to replicate T1-MK1. The system functioned normally after this.

Attached photo shows the completed solder job - the current state of the connector on the rear side of the target bulkhead panel.

The profile monitor actuation tests were completed for T1 and T2. No abnormalities were noticed in vacuum during either test.

Note: an issue was observed with T2-MK1 - see e-log 290. The issue was resolved.

The T1-MK2 target was moved from the hot cell to the storage area, in position 5. Note: manual nudging of the flask was required to get it to align with guide pins properly.

Target T2-MK2 was moved from the storage location (formerly position 3) to the hot cell in preparation for replacement of end of life targets.

See fault 14966: https://web.accel.triumf.ca/ncr/dbfault.pl?faultgroup=CYCLOTRON&faultno=14966&btn_submit=Getfault

The flow rate sensor for T2 target cooling was exhibiting some instantaneous drops below the warning threshold, causing nuisance warnings. It was also dropping quite close to the trip limit. The reason for this unknown and this is unexpected since the sensor was recently replaced this winter shutdown.

Until the problem can be figured out and resolved, Ops has lowered both the warn and trip threshold values to 3.0 gpm and 2.8 gpm, respectively. This was done mid-day on June 7. This has been done in the past and is deemed safe to do as it is still within normal operating parameters (and a defeat is not required). The main reason for doing this is to reduce the chance of an accidental trip if the flow rate were to drop below the previous trip threshold of 3.0 gpm. These noisy blips do not seem to be dropping below 3.0 gpm, although they are close (see attached screenshot of June 6-8 data). The sensor history will be examined weekly, and if there are no drops below 3.0 gpm, these thresholds should be adjusted back to their regular values.

The tubing for the helium wand inside the hot cell is broken and needs to be replaced. More tubing has been ordered and the job will be completed in the coming weeks.

Some oil was noticed around the hot cell window, on the control panel, and on the ground below the control panel. A leak is suspected.

Suggest tightening all bolts to specified torque along the window, and monitoring overflow oil level (position today was marked). If the problem persists, the gasket must be replaced. Note that the gasket should likely be replaced anyway as it has not been done for some time.