Set up shielding canyon for M9 laser tracker job.

Fill shielding blocks are not removed yet, to be done tomorrow.

1. Blank off installed 11:40 with Dan McDonald, east spring ear looks 'deeper" than west.

- Reused all hardware from last install, most active hardware was around 10 mSv/h on contact

- Zero point was at the 1/2 turn marker pen mark

- Installed at 1.5 turns from "finger tight" zero.

2. Spring eye zero set on a spare flange with spare pins.

- backed off 1/2 turn then mounted to exit port.

- tightened .5 turn to get to zero, then 1.5 turns on east and west sides to seal, in increments of .5 turns alternating.

3. Called Edi to start pumping on T2 at 12:50

Surveyed contents of storage flask located at TNF. The lid was lifted off roughly 12" up and a pole monitor was swept over the opening. The fields of the combined items in the flask were 9.84 mSv/h at 12-24". Extrapolated, the field is approximately 3.7 mSv/h at 1/2 m. 

The flask contains an indium blank off plate, ISAC beam window and some miscellaneous used water fittings. The ISAC window is probably the largest contributor to the field.

A list of the contents and the dates the were placed into the flask are attached to the top of the flask lid.

 2022 Apr 28 to 29:

Installed a new remote handling 4" indium joint for new beamline 4 north section. Issues were encountered in clearance between the downstream steering magnet and the compression collar of the joint. Joint installation itself went smoothly. 

The drive screw is a 17mm hex instead of a 5/8". This was noted in the install of the blank off plate in 2016.

See attached pdf report for photos and more description.

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Warm cell reconfigured for water leak repair at coil termination. Radiation surveys done. M20 Q1 ready for removal of insulators.

Attached photo of warm cell as of Tuesday morning.

Insulators # 6,7,8 removed from Q1 headers late afternoon by C Ballard. Ready for removal and re-brazing of #7 joint some time today.

Old #7 coil fitting removed, replaced and re-brazed today by M Good. Insulators ready to go back on to magnet coils to be pressure checked.

Image P1020013.JPG shows #7 coil fitting before removal. Heat shielding in the form of small aluminum sheets were installed to protect the magnet and electrical wiring.

Image P1020028.JPG shows new #7 fitting with all tools removed from area.

Reinstalled ceramic insulators #6 7 8 to Q1 magnet by C Ballard. #6 and 8 went on with no issues. The copper tubing on insulator #7 had to be bent to match the new position of the re-brazed #7 fitting. This may have been due to the removal of the inner and outer conductors (the two copper plates that clamp the two coils together) during yesterdays repair which shifted the position of the coil. See photos.

4" indium flanges at the 2C rad hard valve were cleaned of the remaining indium by C. Ballard. Both upstream and down stream flanges were done, ready for installation of new valve.

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.

Today:

Bridge setup complete; Noticed 12 x 3 x 3 block when placed on top of several other blocks rocked when placed down.

Took initial photos of joint: west side approximately 0.05" to 0.06" gap, east side 0.20" to 0.220" gap. Joint appears to be the same as before. See photos.

Will do visual/video inspection and leak check tomorrow morning.

Joint repair continues.

Leak Check:

- Local leak check performed around area of T2, M9-Q1. All seals other than T2 Q1 were leak tight. Largest source of leak was the T2 Q1 joint area.

- Leak check done in quadrants around joint, response times were <2 sec of applying helium. Leak detector also responded when He probe was near joint (before actually applying He).

Video and Physical inspection:

- Bottom weld lug bolt found in tension/captive (ie. not free to move). Confirmed static by poking bolt. (Videos of this in RH group folder).

- Top weld lug had > 0.2" of gap.

- East and West pins seen leaning slightly toward North (toward Q1).

Loading Test:

At 13:30 a load test was performed to observe the effects of loading nearby blocks around T2 (see photo). Two 12 x 6 x 3 shield blocks were stacked one on top of the other and vacuum was observed, one then the other. There was no observable effect on the vacuum each time. Bottom weld lug bolt was still frozen when poked.

Blocks were replaced to their original locations once test was complete.

The T2 volume was vented at ~14:15 in preparation for disassembly to be performed on Monday.

Today:

- Removed pins and removed indium through ring. Joint fully open at 14.5 to 15 turns of retraction mechanism.

- Did initial video inspection of T2 and Q1 flanges, some residual indium on knife surfaces, did initial scraping of T2 flange. (see videos on RH group folder)

- One blank off prepared with indium ready for installation.

Will continue tomorrow with Q1 scrape and re inspection.

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

See attached.

Yesterday:

Installed indium blank off at M9 T2 joint and pumped down at 15:20 to 15:45 overnight. 1ACG7 (T2 vacuum pressure) reads between 6.0E-3mT and 2.0E-2 mT as of 8:15 today.

- Before installing, an attempt was made to set the bellows in a position to correct for some of the misalignment. This was done by closing the joint with no ring and pinning the east flange ear and leaving it for ~1 hour.

- Blank off installation began at 12:30

- A universal joint installation tool was used to install the East pin. This was due to the very small gap available to install the pin on the East side. The east side of the flange was also pried upon in order to close the east side of the joint. As a result the pin leans North once installed. West pin was installed with no issues.

- Installation finished at 14:30 (roughly two hours, not including flange prep work)

- An inspection after installation revealed the lower lug to be in tension an hour after installation of the pins and blank off.

- Spring eye gaps on installation appeared to be 0.05" to 0.06" on the west side and ~0.2" on the east side.

Will be doing inspection and leak check later today.

Today:

Completed leak check of M9 T2 area: joint(s) are He leak tight. Remote He lines checked as well, see attached.

- Indium blank off ring was cut free from the string tethers.

- Removed extra tooling and equipment, West side pin threaded cap installed. East side needs new capping device since the lean of the pin is beyond installation parameters.

- Vacuum pressure still running higher than normal but stable (see previous e log).

- Water leak in the M9 Q2 magnet return header was discovered. Very slow leak (> 10 minutes per drop). See attached photo and videos on RH group drive.

Cleanup continues tomorrow.

Today:

Cleaned up work site and removed extraneous poles and tooling. Radioactive parts stored in lead flask now located on TNF.

- Two pins, an RH bullet bolt and indium ring (tb22148) were put into lead flask for storage, flask now located on TNF.

- Took photos of spring eye gaps and some video inspection, looks roughly the same as yesterday (see photos).

- Installed a dust cover over the east spring pin (see photos).

Looking at placement of indium rings loaded with EPDM and Buna N at joint for radiation exposure. Will install the test rig on Monday & clean up site for covering up.

Today;

Restoring shielding at M9 T2 area and cleaning up RH setup.

- RH workbench, pole tray and bridges removed from work site.

- 18' x 6' by 3' bridging block removed (at 14:25) to reveal the T2 monument. No apparent change in vacuum, will monitor as shielding is restored.

- Magnet power tests completed by beamlines group, no issues reported.

- Rubber testing ring installed between M9 Q1 and T2, see photo.

- Spring eye gaps appear to be the same as on Friday (after 48h), see photos and video.

Work continues re covering the M9 T2 site tomorrow.