The broken tape on the west side hot cell manipulator was found to be one of two "Z motion slave tapes".  The manipulator can still function normally with only one, however the remaining tape will see twice the load as usual.  It was decided that repair of the manipulator may be delayed until after the T1-MK2 target repair job is complete.  Lifting of heavy objects using the west side manipulator will be avoided until after the broken tape is replaced.

 The broken M20 beam blocker plastic shaft bearing was removed.  Measurements of the bearing as well as the shielding disc (for which drawings can't be found) were taken inside the hot cell and a brass replacement bearing has been designed based on these measurements.

Photos of the removed bearing, measured dimensions of bearing and shielding disc, and a PDF drawing of the new design are attached.

The RH active sump was drained (over Jul 31-Aug 01), in total approximately 5500 L of water was sent to city sewage.

We also tried to divert water from the BL1A holding tank to the active sump, and learned that we cannot run back-flow through the sump pump. The valving configuration used here was V10, V1, SV1, V6 open - V2, V3 closed. (Note solenoid valve SV1 does not serve a purpose and energizing/powering-down does not affect the observed flow.)

In order to divert water from the holding tank to the sump, we likely need to add a 'T' after V6 to send the flow through the opening port into the sump.

The BL1A holding tank was subsequently drained and is now ready again to receive water from T1/T2/TNF.

Vacuum interlock defeat jumpers were removed for T1 and T2.  The interlock was tested by venting the T1 and T2 volumes.  Both packages registered a vacuum trip, however only the T1 package shut off.  A fault report has been filed to investigate this.

Controls group identified that issues with remote actuation of the profile monitor at T2 was due to a short-circuit on limit switch wires on the target assembly.  The relevant wiring assembly was removed from the target and controls group is preparing a replacement.

This morning it was noticed that the warning level indicator for T2 expansion tank displays as tripped on XTPAGE.  The level was checked in the tank and has not moved (is well above the warning level float).  I will investigate further and contact controls group if a solution is not forthcoming.

 The BL1A tunnel was accessed to drain and sample T2 cooling package water.  A puddle of water was noticed in the South TNF area around the drain by the boot-box.  No water was found in the BL1A tunnel.  Photos attached.

 - T1 & T2 targets switched to "remote" control
 - Both target ladders were moved to Position 3 (12mm Be)
 - T2 Q1 flow interlock defeat was removed (only required when target ladder is in position zero)
 - The targets are now ready for BL1A start-up (up to 10μA this evening)
 

 The water in the BL1A holding tank was released to the city sewer.  This water was sampled, tested, and approved for release by RPG two weeks ago.  The total volume was 510L, a combination of water from the T2 and TNF systems.  The total time required to pump out the water with all valves fully open was 1hr2m.  Paperwork for the water release was completed and returned to RPG.

As of 2024-04-03, the BL1A Holding Tank water level is approximately 580L. It is recommended to drain the tank prior to the start of the operating year.

The water level inside the BL1A active water holding tank was checked today (Aug. 23, 2022). The tank is essentially empty at this time.

Replacement of the BL1A blocks was completed yesterday (May 8, 2015) in preparation for first beam down 1A on May 12th.  The attached PDF shows a photograph of the current arrangement, and also the block arrangement at the beginning of the 2014 running period for comparison.

 The BL1A air amplifier has been shut down by closing the air supply valve on the device. The air amplifier supplies high pressure air (110psi) to the following devices: M9BB, M20BB, T1 Profile Monitor, T2 Profile Monitor, T2 Collimator, Septum Polarity Switch

 A 4” Marmon aluminum blank-off flange and o-ring were replaced on the south port of the T1 target monolith vacuum vessel. This port was accessed from the 1A Service Tunnel were the repair took place.

See the attached pdf file “1AT1 Vacuum Leak Repair-Feb2020” for a summary of the repair.

The BL1A amplified air system has been shut off, and will remain off until required for BL1A start-up in Spring 2015 (the lower of the two units was in use, with the upper unit on standby as a spare).

 During the maintenance day today, amplified air to the T1 area was valved off in an attempt to pin point the location of the air leak.  The air amplifier cycle rate returned to normal with the T1 line valved off, indicating the leak is somewhere on the T1 profile monitor air cylinders, the T1 septum polarity switch, or on the supply lines to these devices.  Because these devices will not be used in the near future, the line will be left valved off.  Eric Chapman has applied a defeat tag to the valve and made an entry on the Cyclotron Logbook.

The cause of the leak will be investigated further during the 2014 Fall Mini-Shutdown

While the 1A blocks over the T1 area were removed last week the opportunity was used to investigate an air leak on the amplified air system discovered on August 11, 2014.

The leak was found to be coming from a device related to the septum polarity switch located behind (south of) the septum power supply on the 1A blocks.  This device is not in use, so the amplified air to the device was disconnected by plugging the relevant branch of a brass 3/8" Swagelok T fitting in the area.  This stopped the leak, and the air amplifier is cycling at usual speed after being restarted.

 Mike Vogel reported that alignment of the Q1Q2 assembly w.r.t. the T2 and B1 flanges was completed on July 7.  This was performed in the test stand with the flange positions set to the measurements taken in the 2019 shutdown.  Alignment to the theoretical location was achieved within 0.1mm.

The axis of the Q1 and Q2 magnets were aligned to each other previously within similar accuracy.

 The faulty air pressure supply check valve for M9BB, M20BB, and T2 Profile Monitor was replaced.

The rotor, shaft, and o-ring were replaced on the Q4 flow transducer to address erroneous readout that began last week.
The attached plot shows the flow readout before failure, during the failed state, and after repair.

We tested the air amplifiers by actuating the beam blockers and profile monitors on the T1 and T2 target stations. 

The blockers and profile monitors were each actuated (brought up/out and down/in fully) > 5 times and vacuum remained stable throughout (see attached).

The cycle rate of the air amplifiers (time between 'puffs') under steady conditions (target devices kept in the out position) was measured to be between 60-90 seconds, with 90 seconds corresponding to when the 'flow control' ball valve is fully shut and ~60 seconds when the valve is opened (either partly or fully). 

When a target device is brought up, a cycle event will occur shortly after the device reaches the out position.

This cycle time is much longer than last reported in 2014 (see elog #119), by a factor of 2-3. 

The top amplifier sounds different from the bottom amplifier (cycles between being 'rattly' and 'quite' between cycles).

Seeing how the beam blockers and profile monitors were actuated smoothly with the air amplifiers, we will keep the system running off the lower air amplifier with the 'flow control' ball valve kept open (not shown).

At some point we will look into disassembling the top amplifier to see why it sounds differently between cycle events.

For reference, both amplifiers read 20psi at the regulator and 120 psi to the target station. 

 The lower air amplifier has been started, and air supplied to the T1 and T2 areas by opening the appropriate ball valves beneath the amplifier.  The amplifier is cycling normally and the barrels are cool to the touch (indicating no significant air leaks).

Actuation of both profile monitors was checked from the control room.  Both reach the in and out limits as expected, with no change in vacuum level in the respective volumes.

A full rebuild of the upper air amplifier was completed.  New anodized aluminum barrels were installed (replacing the old brass design), as well as new pilot valves, piston seals, bearings, and o-rings.  

The amplifier is operating smoothly with a cycle period of 25.6 seconds, compared to 14.8s before rebuild (based on 8 cycle measurents at 110psi output with beam blockers lowered).  

The lower air amplifier currently has a cycle period of 24.8 seconds under the same conditions (rebuilt in 2010).