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.

Today we attempted to scrape remnant indium from T2 M9 exit port and clean B1 knife flange for the new magnet. Report of todays activities attached to the elog.

The M9 Q1Q2 magnet assembly was installed in the M9 beam line today. 

Attached to elog is an inspection report of the indium ring that will be used in the M9 T2 Q1 joint.

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.

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.