The T1-MK2 target was moved from the hot cell to Hole #5 in the storage pit.  The M9 beam blocker was then moved from the beamline to the hot cell for MRO work.  A field of 14.4mSv/hr was measured at 0.5m from the beam blocker during removal.

During first injection of beam down 1A problems were encountered with the T1 protect monitor.  Testing was done by Probes Group from the mezzanine leading to the following investigation and repair work.

May 9th:

- T1 area uncovered, Probes Group performed testing at the top of the monolith confirming that the problem was below the vacuum flange
- T1-MK2 target moved from the beamline to the hot cell.  Measured field 800uSv/hr at ~0.5m
- Visual inspection of protect monitor performed:  No obvious issues with monitor plates.  Some small impact holes visible on exit side of monitor, similar to damage on the previous monitor from Oct 2015
- Electrical check performed on old protect monitor in hot cell, confirming the previous results
- Failed protect monitor removed, resistor pack installed and tested with expected results
- Profile monitor insulation found to be blackened and cracking, so the profile monitor cassette was also removed
- New protect monitor and profile monitors installed
- Electrical check performed on both monitors at the hot cell: Results good for both

May 10th:

- Vertical and horizontal positions measured for the new protect and profile monitors
- Profile monitor actuation tested:  started moving ~10psi, fully actuated ~50psi, monitor limit switches ok
- Measured total resistance of potentiometer: 20.26kOhms
- Target windows inspected and photos taken (stored on Isaac's hard drive), nothing unusual encountered
- T1-MK2 target returned to beamline, vacuum pumped down without issue
- T1 cooling package started fine with no change in vacuum
- T1 profile monitor actuated in and out.  Movement smooth and slow
- Electrical check done on protect and profile monitors from mezzanine: both good

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 elevation measurements and beam spot plots were completed on the T1-MK2 target and the target is now fully repaired and ready for use.  It will be returned to the storage pit when cranes are available.

A copy of the elevations measurements and beam spot plots is attached.

The target ladder was detached, old delta seals removed, sealing surfaces cleaned using scotchbrite pad and a dremel tool, and delta seals were installed on the lower face of the upper slide plate.  The target was leak checked and found to have no significant leaks (no response from 2s helium spray at previous leak location on upper slide plate).

The profile and protect monitor electronics were checked by Bill Rawnsley and appear to be functioning normally.

The T1-MK2 target is now ready for use in the beam line.

- T1-MK2 target moved from storage pit to hot cell
- Removed unused proximity sensor and associated wiring (stored in tool-port boot box cabinet)
- Tested profile monitor actuation: seems stiff, but moves ok;  start travel @ 30psi, fully in position @ 50psi
- Replaced vacuum flange o-rings: Plug (#202), Feed-through port 1 (#222), Water supply tubes 1 and 2 (#208)
- Replaced all nylon ferrules for water supply tubes
- Leak checked water supply tubes: leak tight
- Replaced rusty nuts on profile monitor lift plate
- Profile monitor limit switch wiring replaced (D. Cameron)
- Heat shrink applied over motor wires (D. Cameron)
- Position micro-switch connectors replaced (D. Cameron)
- All wiring wrapped with protective coil and secured with PEEK zap-straps (D. Cameron)
- All limit and position switches tested: ok
- Profile monitor bellows straightened (noticed rotation of base seems stiff)
- T1-MK2 target moved to storage pit location #3
- T2-MK1 target moved from storage pit to hot cell for re-wiring

 

When the damage to the T2 Protect Monitor was found to be caused by flying debris from a vacuum spike (see e-log #179), it was decided that the T1 Protect Monitor should also be replaced.

Oct 8:

- The T1-MK2 target was transported from the beam line to the hot cell after the T2 target was returned to the beamline (see e-log #180).  The T1 target was 38.9mSv/hr at 0.5m

- The T1 target was inspected in the hot cell: profile monitor looked ok, protect monitor damaged with holes and dents on upstream side (see attached photos), position 4 target looked ok with beam spots roughly centered (see photos)

- The old protect monitor was removed in the hot cell and a new monitor supplied by Probes Group was installed (previously undocumented brass spacers were seen over the monitor cassette alignment pins on the target)

- The T1-MK2 profile and protect monitors were checked by Probes Group at the hot cell --> both ok

- Measured elevation of the new T1-MK2 protect monitor: 1831.1mm on entrance side (previously 1831.0 --> ok)

- Position 4 target entrance side elevation checked: 1832.9mm (previously 1831.9mm --> 1mm discrepancy)

- Position 4 exit side elevation measured: 1832.4mm (previously 1832.1mm --> ok)

- Protect monitor exit side elevation measured: 1833.7mm (previously 1833.3 --> ok)

- T1-MK2 target returned to beamline at approximately 5pm, no problems

- Vacuum pumped down quickly and it was decided that a leak check would not be necessary

Oct 9:

- All target services attached

- T1 target moved to Position 0 using remote control box

- T1 package started, no change to T1 vacuum

- T1 profile monitor and protect monitor electronics checked by Probes Group from mezzannine --> both ok

- T1 motor drive cable conected to controller in 1A racks.  The T1 ladder can be moved from the 1A racks mimic panel (T2 still requires portable control box)

- Actuation of the T1 profile monitor was tested --> actuated properly, no change in vacuum

- T1 cooling package expansion tank level checked: no change

- The T1 area is ready to be covered

 Bill Rawnsley and Mike Russell performed a 'blip' test on the T1-MK2 profile monitor and protect monitors today.  A possible bad wire at  #9 location in the vertical array on the profile monitor was found (this is two wires above center).  Bill did not think this was a serious concern and beam tuning can be (and has been done in the past) with wires missing.  Otherwise the responses were normal for both monitors and the scope readings were almost identical to when this target was checked in August 2011.

The T1-MK2 target was transferred from the beam line to the storage pit in hole #5 using the transfer flask.  A maximum field of 7.2mSv/hr was measured at 0.5 meters from the target.  A video was taken while the target was lifted from the monolith and can be found on Isaac's PC (too large to upload).

The blocks to the west and east side of the T1 monolith (level with the monolith) were swiped by Danka Krsmanovic and no contamination was found.  These blocks will therefore not be painted this shutdown.

The three active filters removed from the T1 cooling package have been labelled and stored in the area north of the BL1A blocks boot box with permission from Danka.  The bag with the filters is 100microSv/hr at 0.5m and 2mSv/hr on contact.

 A leak check was performed on the T1-MK2 target in the hot cell today and confirmed successful leak-free installation of the new water supply tubes, delta seal retaining rings, and delta seals on the upper slide plate.  The remaining tasks are to install delta seals on the lower slide plate and have the protect monitor and profile monitor electronics checked by diagnostics group.

  After removal of the leaky target cassette at position 3, plugs were installed on the target ladder and a leak check was performed.  With the target pumped down to approximately 10 mTorr, and helium detector gauge baseline of 9 on the 10X scale, a response of up to 25 on the 500X scale was observed when leak checking the right side delta seal on the lower face of the upper slide plate using a standard 1s spray of helium at 3 psi.  The flange screws were tightened and the leak check repeated.  Under the same conditions there was a response of up to 60 on the 100X scale - There was still a leak, but not as severe as before.  The screws were tightened further, and the target leak checked again, with no change.

At time of installation a response of  up to 10 on the 100X scale was found at the same location.  This target was found to be water leak tight and was used in  the beam line for ~4 months.  It is possible that the seal is still water leak tight.

The seal must be replaced or a static water test performed to show that the target is water leak tight.  Seal replacement will take approximately 2-3 days. 

 The following work was performed on the T1-MK2 target assembly during the September 2016 Mini-shutdown:

Monday Sept 26:
- Target moved from beamline to hot cell (28mSv/hr at 0.5m)
- Position 4 beam spot on entrance and exit windows photographed (attached)
- Target flushed with fresh water, positions 0, 4, and 5 blown out with air, then left overnight with air blowing through position 0 at 10psi supply
 

Tuesday Sept 27:
- Pumped on target water system using lab leak detector:  reached 1.0E-3 Torr and E-8 Torr*L/s range in < 5 mins
- Initial leak check performed: TPP < 1.0E-3 Torr, Base leak rate: Low E-9 range, 3psi helium supply, ~0.5s bursts
- Response up to 3.6E-6 at lower left side delta seal (when facing ladder), up to 4.9E-7 for lower right seal  (note: T1 area at good vacuum level prior to mini-shutdown),  All other positions no response, or response in low E-8 range (assumed drift or insignificant helium leak)
- Plugs at positions 1, 2, and 3 removed.  All threads inspected, brushed with wire brush, rinsed with acetone, and blown dry with compressed air
- New targets installed:  Serial #101 at Position 1, #102 at Position 2, and #103 at Position 3  (Position 1 threads significantly stiffer than others, but no major issue)
- Leak check repeated: similar response from all locations including all beryllium target windows  (concluded suitable for use in beamline)
 

Wednesday Sept 28:
- Profile monitor actuation checked in hot cell:  movement starts at 27psi, fully actuated at 48psi, limit switches functioned properly
- All target ladder micro-switches checked, ok
- Vertical and horizontal target position measurements taken using procedure in Document #50194  (PDF attached)
 

Thursday Sept 29:
- Target returned to beam line and all services connected
- Target info sheet and elevations delivered to Ops, XTPAGE 7L updated
- T1/T2 PLC information updated with new cassette information
 

Friday Sept 30:
- Vacuum pumped on the T1 volume.  Quickly 200mTorr (threshold for T1 Vac OK signal).  Edi reports pump-down slower than usual, will evaluate on Monday.
- T1 package started (no change in BL1A vacuum)
- Profile monitor actuation checked from control room (actuated normally)
- T1 profile monitor and protect monitors checked by Mike Russel and Victor Verzilov:  profile monitor normal, protect monitor signals low but Victor expects it is fine and give ok to cover

 

 March 29 Monday

- moved T1-MK1 target from beamline to hotcell  (field from target 15mSv/hr @ 0.5m)

- flushed water through position 4

- flushed air through all positions

- left air running @ 5psi overnight through position 5

- potentiometer reading "O/L" at position 3, all other positions OK

- all micro switches OK

- removed the left plug (when facing ladder) at position 1 , but after reading elogs it was found that the right plug at position 1 was having issues. Will have to replug left with new plug

March 30 Tuesday

- pumped down with cold trap, started at 10:00

- test port 2.0 E-1 Torr after 1 hour

- cold trap removed, cleared, dried, refilled

- 11:10, started pumping, found leak at lab vac tubing joint. Fixed.

- 11:16, started pump again

- 11:24, 1.0 E-3 Torr TPP, 1.4 E-9 L/s leak rate

- preformed leak check, no response at all locations

- position 4 Be target removed (required hammering). Damaged spot, potential start of hole observed at center of beam spot (see attached photos)

- position 5 graphite target removed (required hammering)

- New 12 mm Be target #108 installed at position 4

- New 12 mm Be target #109 installed at position 5

- leaving position 3 plugged as the potentiometer is reading "O/L" as indicated from the multimeter 

- New plug installed on left side of position 1

- 15:47, stated leak check pump down

- 15:57, 2.0 E-3 Torr 

leak check results

All positions were no response (NR) except

Position 1, Right side plug) 5.9 E-8 Torr

Position 3, Left side fitting) 5.3 E-9 Torr

Position 4, Left side fitting) 4.2 E-9 Torr

All locations should be H2O tight

March 31 Wednesday

- took vertical and horizontal measurements of the new position of 4 and 5 targets (updated elevations PDF sheet included)

tested profile monitor activation

- started moving at 15 psi 

- reached limit at 35 psi

- both limit switches OK

- Cleaned base of vacuum flange and top of support ring

- prepared target ready for transport with flask (ladder in position 0)

- contacted MCR to update XTPAGE 7L target details

- emailed Tony Tateyama to have PLC lookup tables updated with new target info

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 #6 male Hansen fittings for the T1-MK1 and T2-MK1 targets (both currently stored in the target storage pit) were replaced today with new units.  Some of the target assembly Hansen fittings had shown signs of leaking and the internal seals are not easily replaced.

"120V" warning labels were put on the micro-switch IN and OUT limit sensors for the profile monitors on both targets.  These are the only micro-switches on the assemblies that still run at 120V after the PLC controls upgrade.

 T1-MK1 target transferred from hot cell to storage pit position #3 to free up the hot cell in preparation for shut-down activities.

Current device locations in storage pit:

Pos 1: TNF Resin Can
Pos 2:    empty
Pos 3:  T1-MK1 Target
Pos 4:  T2-MK1 Target
Pos 5:     empty 
Pos 6:     empty 
Pos 7:     empty 
Pos 8:     empty 
Pos 9:     empty 
Pos 10:   empty 
Pos 11:   empty 
Pos 12:  Liquid Deuterium Target
Pos 13:  Kaon Target
 

- T1MK1 target transferred from storage pit to hot cell (max field: 4700 μSv/hr @ 0.5m)

- Protect monitor with incorrect wiring removed (20μSv/hr on contact, 60cpm contamination on 44-2 meter)

- Scott Kellog fixed the wiring and returned the protect monitor (correct wiring schematic is TDE0301E, previously used incorrect schematic D10649)

- Installed new protect monitor on target

- Profile monitor was found to have broken wires and will be replaced with new more robust design (0.005" thick gold coated molybdenum wires)

- Bill Rawnsley confirmed that protect and profile monitor wiring harnesses are wired correctly using resistor packs

- Bill was double-checking the wiring of the new profile monitor before installation and found that it had been wired incorrectly.  Scott K. will fix the wiring and return the monitor mid next week for installation.

- Leak check was performed on the target and confirmed that all seals and target cassettes are leak tight

- Re-wired profile monitor was received from Probes Group and installed on the target

- Protect and profile monitors were 'blip' tested, both OK

- Profile monitor actuation and limit switches tested, all OK (monitor starts to travel @ 20psi, fully engaged at ~40psi)

- Elevation measurements taken for profile and protect monitors

- Target ladder moved to position 3 (12mm Be target)

- Noticed strange 'click/twang' noise when moving target ladder, found to be caused by twisted bellows on water supply tube

- Bellows was straightened, and the target was leak checked again (still leak tight)

- Noticeable wear was found on potentiometer wires.  Pot values still read accurately.  Travis C. inspected and does not think they need urgent replacement.  Will have Probes Group look at it next time the target is in the HC (they are very busy now).

- T1-MK1 target transported from HC to storage pit location #3  (ready for use in beam line)

- T2-MK1 target transported from storage pit to HC (max field: 97,000 μSv/hr @ 0.5m)

 The T1-MK1 target was leak checked on April 15th at the T1 monolith by Ron Kuramoto and Edi Dalla Valle.  No leaks were found.

 - On Nov 13 at ~1am the BL1A vacuum went bad.  The T1 and T2 volumes were isolated and pumped on separately, the results indicated a water leak from the T1 target.  The level of the expansion tank was slightly below normal at this time, but not enough to be conclusive.  The leak was confirmed at ~9am by starting the T1 cooling package which caused a dramatic vacuum spike.  Approximately 1" was lost from the expansion tank when the package was started, equal to approximately 2.5L of water.

- The T1-MK1 target was removed from the beam line and transported to the hot cell.  A mound of ice was visible on the target lower plate while it was being lifted.  A radiation field of 160mSv/hr was measured at 0.5m from the target during removal.  Upon inspection in the hot cell, a small but clear hole was visible on the entry window of the position 3 target cassette just slightly above and to the right of center if facing downstream.  No water was visible on the profile or protect monitors.  Approximately 1" of water was visible in the base of the T1 monolith.  The monolith was left open to air overnight, and approximately 0.5" of water was visible in the morning on Nov 14.

- Vacuum group was consulted, and given the relatively small amount of water remaining they agreed to pump the water out of the beam line rather than have Remote Handling group try to remove the water before target installation.  The T1-MK2 target was transported from Hole #3 in the storage pit to the beam line.  A field of 5mSv/hr was measured at 0.5m from the target.  All services were attached.

- An electrical check was performed on the profile and protect monitors by David Cameron from the 1A mezzanine.  Both devices appeared normal.  Plant Group then began to replace the blocks over T1.  Graham Waters updated the control software so that the correct target ladder potentiometer values are referenced.  An updated target information sheet was prepared and delivered to Operations (PDF File Attached)