Removed 8" rubber test rings from M9 T2 joint. Rings moved to RH warm cell. Radiation levels were 70 µSv on contact 1.7 µSv @ 1/2 m.

Bagging bunker was setup west of the T2 M9 work area, see photos.

Began disconnecting M9 Q1 Q2 services: Electrical and thermal switch connectors disconnected from service stand, water service lines for Q1 and Q2 remain to be disconnected.

Beam lines group purged M9 Q1 Q2 magnets and water lines in preparation of disconnecting water services to those magnets, done in morning.

- Note: Q15 protueus paddle wheel was replaced after finding it was worn

Water connections at service stand partially disconnected.

- Q2 water lines disconnected, 1 Q1 water line is disconnected but stuck on hansen fitting. with continue on Monday.

- Photo showing stuck fitting shown below (fitting on the right).

Determined M9 Q2 service stand supply connector was slowly leaking.

- Ball valve to the supply was leaking through allowing trace amounts of water through.

- System was bled again and pressure relieved, leak appears to have stopped.

Inspected M9 Q1 joint bottom bellows bolt lug and spring eye gaps.

- Bottom bolt is in tension, tried to move with tool and did not move.

- Observed spring eye gaps: 1/32" or less on West spring eye, 0.200" on East spring eye.

Cleaned up RH setup in preparation for moving bridge setup tomorrow.

Preparing for M9 Q1,2 move:

1. Re-arranged/organized cables on top of magnet.

2. Re-configured bagging bunker for walk around access.

3. M. Kinakin replaced bullet bolt that was used for assaying.

- Removed new bullet bolt from magnet and decontaminated

4. Fully collapsed M9 Q1,2 vacuum box

- Q1 front flange up against T2 flange, appx .25" clearance between Q2 spring eyes and B1 vacuum box.

- Helium line appears to be sticking out under B2

- See above and below photos.

5. Disconnected some kind of electrical line from M9 Q2.

- Was secured and pulled off from magnet; see photos below, before & after.

CUALCW system water loss was not from 1A triplet. Q15 Q16 held static pressure at 90 psi since 9 am until 17:00. Holding with very minimal change in pressure. Q14 reading 64 psi as of 17:00. D. Preddy informs all other systems leak tight.

M9 Q1 joint disassembled, blank off and pins removed.

- M9 Q2 joint pin drive retracted but was not removed. Pin drive did not contain the roll pin that aids extraction of the drive.

Today, re-arranged electrical wiring on Q1 Q2 magnet away from Q2 indium joint. Cable bundles were bundled as neatly as possible.

- One of the klixon thermal switch wires broke off while the cable bundles were being organized. See photo.

Completed disconnecting water services from services stand to Q2.

- Supply connector (the connector that did not come off last week) came off with some effort, return connector came off with no effort.

- Appears to be a slow leak from the male hansen fitting supply side; leaking @ one drop every 11 sec. Also observed a very slow leak (> 2 min) on Q1 return side on magnet stand.

Removed Q2 15" indium seal ring, discovered seal contained rubber on both sides instead of indium.

- Some kind of oil residue seen at the bottom of the sealing ring and inside of the Q2 vacuum box. (Note: Oil residue was from downstream vacuum roughing pumps. They were connected when T2 M9 joint was leaking. Oil got into the vacuum pump back streamed into the beam line.)

- Probing of rubber seal showed it was still soft at the top and bottom while brittle on the sides near the beam plane (Small pieces broke away when pressure was applied).

- Ring measured 11 µSv on contact, 0.7 µSv @ 1/2 meter, no removable contamination.

Removed a stainless remote handle-able bolt from Q1 cover plate for assaying.

- Bolt removed from South East corner of top cover plate. See photo for location of removed bolt.

- Removed bolt measured 600 µSv on contact, 11 µSv @ 1/2 m, no removable contamination. Bolt placed in a marked lead vial for storage.

- Replaced with identical remote handling bolt in same location.

M9 Q2 15" pin drive was removed and disconnected.

- Pin drive retention screw had to be completely removed to be able to remove pin drive completely.

- Had to make tools to remove pin drive and retention screw, see photos.

- Retention screw removed with 3/4" hex socket with .010" shim inside to cause interference with 3/4 hex bar. Hex socket was then jammed on to screw to retain it. Part was then unscrewed and carried away with socket. 80 µSv on contact, 10 µSv @ 1/2 m, no removable contamination.

- Pin drive removed with double hook tool, left on stand next to steel blocks at magnet elevation.

- 93 turns to fully retract pin drive, 4 turns to completely remove retention screw.

- Q2 joint was pried open with a screwdriver wedged between B1 flange and indium ring. See photo for final result.

 Found original installation notes for the initial installation of M9 Q1Q2 generation 2 in 1988.

Dated May 17th there is a notation that the 15 inch indium ring was loaded with "Gummy Mag". Note that the rationale for using an elastomer seal in an indium knife application is still unknown.

 The M9 B1 was removed from the M9 channel surveyed and moved to the remote handling warm cell for refurbishment.

The warm cell is currently locked. Remote Handling should be contacted if access is needed to B1.

A field map of B1 is attached as a pdf file.

Remote Handling plus support groups are currently attempting to install and commission indium vacuum seals into the following M20 front-end joints:

- T2/Q1

- Q2/Scraper

- Scraper/T2

The first indium joint installed was at T2/Q1 during the week of May 14 to 18.  Rubber seals were installed at the other two joints.  The system was leak checked on Tuesday May 22 and a suspect leak response was detected. 

The details of the installation and the leak check are in the attached .pdf e-mail dated 23 May 2012.

Today (Thursday 24 May 2012) the T2 volume and M20 front-end vacuum system were leaked checked with rubber seals in all aforementioned joints by RH group and Vacuum Group.  The results are listed below:

The test equipment consisted of a long Remote Handling pole with a copper helium applicator line attached to the end, joined to a long plastic line extending up the pole to the RH operator above. 

The plastic line was kinked with a zip-tie to cut off the flow.  To engage the flow for each test, the zip-tie was removed and the kink was opened. 

This would result in a burst of helium of a pressure you could feel easily on your face for approximately ~1s followed by a steady, very low flow just detectable on the cheek / tounge. 

The Varian Leak Detector was used attached by Vacuum Group to the T2 and M20 front end volume.  Edi Dalla Valle monitored the leak detector and communicated to Ron Kuramoto via headset radio.

The test started at 11:15 am, 1ACG4 20mT, 1AVA8 closed.

1) M20 Beam Blocker Top Flange (Top of T2 Monument)

11:15 am

Base leak rate 1.5 x 10-8 atmcc/sec

10 second spray of helium

No response after 2 min.

2) M8 T2 Blank-Off Flange

11:30 am

Base leak rate 1.5 x 10-8 atmcc/sec

5 second spray

First reponse after 30 seconds

Peak at 2 minutes, 4.1x10-8 atmcc/sec

3) M20 Q1/T2 Flange Top-Dead-Center

Base rate 1.7x10-8 atmcc/sec

5 second spray

First response after 40 seconds

After 60 seconds, 2.5x10-8 atmcc/sec

Peak at 2 minutes, 3.3x10-8 atmcc/sec

Recovery beginning after 2.5 minutes

4) M20 Q1/T2 Flange Bottom-Dead-Center

Base rate 1.7x10-8 atmcc/sec

5 second spray

First response at 45 seconds

Peak at 3 minutes 3.0x10-8 atmcc/sec

*1ACG4 read 16 mTorr at 11:55 am

5) M9 Q1/T2 Flange Top-Dead-Center

Base rate 1.6x10-8 atmcc/sec

5 second spray

No response after 3 minutes

6) Downstream T2 / 1AQ14 (Collimator B Area, see attached photo of Ron Kuramoto applying helium at this area)

Base rate 1.5x10-8 atmcc/sec

5 second spray

First response after 10 seconds

3.3x10-8 atmcc/sec at 1 minute

Peak at 1m 45 sec 3.6x10-8 atmcc/sec

7) M20 Q2/Scraper

Base rate 1.6x10-8 atmcc/sec

5 second spray

First response after 2 minutes 1.7x10-8 atmcc/sec

Peak at 2.5 minutes 1.8x10-8 atmcc/sec

This leak check confirmed suspicions of helium drift to the known leak at T2 / 1AQ14 joint on the T2 monument. 

The delayed leak response seen on May 22nd at M20 T2/Q1 is very likely drift of helium to this known leak based on these measurements, and not an actual leak at T2/Q1.

Edi Dalla Valle re-confirmed these leak check results with standard remote helium line tests.  His notes for these tests are scanned and attached.

We will proceed tomorrow to make up the T2/Q1 joint with the same ring and pin combination as used May 17 to May 22 2012.

See attached scan for repair notes regarding M20 Q2 during the 2019 winter shutdown. The repair method for M20 Q2 was instigated by Doug Preddy and Beamlines group. Cooling line was blanked off during the 2019 winter shutdown in order to keep the M20 beamline running without removing the magnet and doing a complete repair on the leaking coil. 

The replacement pin drive anchor (see TB22300) for M13 Q1Q2 vacuum box lowered into initial position. The original B1 base plate was able to rock when weight was placed upon it; A concrete block was used to counterweight the base while the new pin drive was being installed. The pindrive has not been adjusted into final position.

Installed Q1Q2 pin drive and attempted to align it to the vacuum box. Spent majority of the day trying to align the pin drive/anchor.

- Pneumatic drive does not actuate smoothly, appears to be binding/catching, possibly due to some kind of misalignment, issues with the pneumatics. A 1" space between T1 and Q1 flanges has been set but has a slight taper, starting 1" wide on the north east side tapering down by ~1/16 (to 15/16") to the west.

- Gap has been set as a comprimise between smooth pneumatic operation and alignment of the flanges. The alignment of the flanges is independant of the axis of the vacuum box due to the front end alignment bellows.

"Hector" shield block installed into place, Q1Q2 Vacuum box still actuates normally. It does not appear that the position of the pin drive has shifted. Some additional shielding steel is to be placed on top of the shield block once RH setup is removed.

Remote handling equipment installed around T1 ready to install indium blanking plate between T1 and M13Q1.

He leak checked T1M13Q1 joint, is leak tight.

 - Detected a small leak in nearby M15 slits box. 4.3x10E-9 atm cc/sec was highest leak rate recorded (Vac group says is small leak, okay to run).

 - Will be tearing down bridge setup and cover up area.

See inspection notes attached for failed M9T2 double-indium thru-ring TB22148, inspected on Oct 15th 2012.

Ring was approximately 3 mSv/hr on contact and 100 uSv/hr at 0.5 m.

Total dose accumulated during inspection on dosimeter 122 was 0.1 mSv

Installed 4" indium seal at 1VM3 to IVQ4. No real problems with installation.

Today I picked up two 2FT x 4Ft x 0.125" thick strips of stock EPDM and BUNA-N (Nitrile) material from BC Rubber Supply.  A copy of the Packing Slip is attached.  Here is the information from the Sample Sheet:

Nitrile 60 Commercial Grade

Type: Moderate Oil Resistance

Temp. Range: -30 to 190 (does not specify C or F... assuming C)

Ozone Resistance: Poor

Tear Resistance: 240 lbs/in.

Elongation: 500%

Tensile Strength: 1700 psi

EPDM AB-563 Premium Grade

Type: Excellent thermal & Chemical Resistance

Temp Range: -40 to 250 F

Ozone Resistance: Excellent

Tear Resistance: 145 lbs/in

Elongation: 500%

Tensile Strength: 890 psi

Sample preparation notes:

- Rectangular cross-section rings of this material were cut by hand using a compass-type rotating blade cutting tool on a work bench.  The process of cutting the rings to get the cross section as even as possible all around was finicky and required several attempts.

- The rubber rings cut from the stock material were nominally 8.040" OD X 7.66" ID x 0.125" thick, but this varied likely within +/- 0.020" each on the OD and ID due to the lack of precision in the cutting process.

- In the end, the final rubber rings cut were adequate to fit in the 8" double-sided aluminum carrier ring seal grooves without falling out.  For the future, a rule die would be best for cutting the samples and one should be made to prepare the next planned set of test samples.

- The strips were cleaned with Methanol.

- Two 8" double-sided aluminum carrier rings were cleaned and prepared, one packed with EPDM and one packed with BUNA-N (Nitrile). 

- Break-away sample coupons for analysis of the neutron flux received by the 6061-T6 aluminum carrier ring material were notched into the carrier ring fins with a bandsaw and deburred.  Two coupons nomially 0.25" x 0.25" x 0.125" thk were prepared for each ring.  These coupons will be broken off for analysis upon retrieval of these test samples.

- A make-shift lifting yoke to allow us to lower the rings to their resting place over the M9/T2 flange was prepared with and aluminum strip and bail wire (see attached photos).

Our plan for Monday Oct 22nd is to lower the two test samples on their lifting yoke and bail and rest them above the M9/T2 flange before covering up the area with blocks. 

The date and time of insertion will be recorded and samples will live there and receive operating dose from the beam and T2 target until the next time the M9 T2 area is uncovered and we can retrieve them for analysis and testing. 

The reason the 8" aluminum double-rings are used is because we plan to build a vacuum leak test jig using the standard 8" spring-loaded knife edge flanges typical of the designs at the M9T2 and M20T2 joints. 

The irradiated samples will be tested in this jig and compared to samples prepared using the virgin (non-irradiated) material  A test plan will be written to encompass the exact set of mechanical tests the samples will undergo to compare them to the virgin baseline.

Today:

Disconnected and removed 4VVR1 gate valve and removed from beamline.

- Pin drives removed and stored in bags near by

- Hook collar removed and stored in separate bags. The hook collar used at CM1 was marked with an "X".

- Indium rings also removed and stored in separate bags. Indium appeared to not stick on to the flange during removal on the tank side flange. A closer inspection will be needed at a more convenient date.

- Craning out the valve proved difficult as the shiv block was interfering with the motor lift. Lifting the valve on to the combination magnet, adjusting the sling length shorter and then final craning was the procedure used.

Cyclotron tank flange entrance at combination magnet has been covered with plastic bag and taped off. Valve was then transported to the north tunnel alcove for intermediate storage as per instructions from RPG.

Note that during cart transport, the valve tipped and fell off the cart. No visible damage could be seen on initial inspection.