Attempted to remove RH parts between Q1, 2 and monitor vacuum box. Removed Q1 to monitor box parts, could not remove monitor to Q2 parts, pin drive and indium ring are stuck in place. Indium joint is severed however. Collar was removed.

East leg of pin drive was bent trying to remove the stuck indium ring, it is stuck to the monitor box.

Recommend to proceed with removal of magnet regarless of the current state of the indium ring.

Pails with RH parts marked 1384, 1385, 1386 and stored in north end of vault tunnel on grey shelf. RPG storage book updated to reflect this.

test

Beam lines took measurements of top of T2 using Leica Total Station. Required no crane activities over 1A blocks.

Video imaged T2 port post blank off removal, looks roughly the same as last year. Knife edge looks clean.

Attached composite photo of flange face, ring is a stand off to maintain focus distance to camera. Also attached partial composite image of 2017 video inspection.

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

Today leak checked the M9 exit port with Edi and we found no leaks. The usual delayed helium response in the M20/Collimator B/ M8(?) area is still persistent, however Edi says the vacuum level at T2 is the same as before.

Shielding should be restored next week.

Installed the remaining laser tracker jigs for beam lines. No issues. Made sure 8" target the mounting poles did not interfere with each other and pin drive was engaged with no issues.

Removed all Leica tracker targets from M9 pit, I will proceed with blanking off T2 exit port sometime this week. Alignment group has taken possession of their laser equipment and the target jigs.

Restored shielding to T2 M9 void, blocks seem more crooked compared to previous years.

 - Removed blank off from t2 m9 port, had to pry off with screw driver via spring ears. Clean removal it seems.

- Blank off is 200 uSv @ .5 m, 5000 CPM above bg.

- looks like 2 knife steps all around with oozing on the left and right, 0 and 180 deg positions. 0 and 180 look like 2.5 steps. Looks like it took one turn to remove/loosen blank off.

- Junk indium at bottom of exit port still present, indium knife edge seems clean. Ribbon stayed in blank off.

Installed all jigs and Alignment group did their shoots successfully. Used individual pins on the 15" target jig and worked ok. 8" target jig has some previously undiscovered issues from the previous shoot from 2015 but did not affect this shoot.

Installed the blank off on the T2 M9 exit port:

Blank off 2013 installation procedure: 2.5 turns of the preload nut, after pins are engaged and springs are at free length.

Blank off 2015 installation procedure: 1.5 turns of the preload nut, after pins are engaged and springs are at free length. (one less turn for insurance?)

2017 (this year) installed blanking plate via hammering/tapping pins into place:

1. Spring eyes were set at spring free length and then placed down
2. Pins did not slide through eyes as was expected.
3. Nuts were then backed off roughly 1 turn, then pins were lightly tapped down into place
4. Nuts then turned back to zero/starting position
5. Then alternating east west by .5 turn tightened to 1.5 turns, 1/2 turn indicated by half bar pen marking.

This year different than prior years due to tapping pins into place rather than backing off eyelet nuts and sliding pins into place *then* tightening to zero point and then tightening to preload.

Blank off installed at 11:15, vacuum group not able to pump on T2 until tomorrow.

Prepared m9 and b1 flanges for accepting their target jigs. The target jigs need to be reset by alignment group, 15" was bumped and 8" lost 2 of the target balls into the beam line. Reflector balls were recovered with a magnet on a stick, contaminated with 250 CPM, need alignment group to decontaminate and clean them before use and reset the two jigs.

Syd installed two springs on the 8" target jig and only one spring is needed.

Correction that all supply side (even numbered insulators) ceramic insulators on Q15 have been replaced with new old stock insulators as of today. Beamlines finds no power or water issues. Expected to cover up tomorrow moving on to the Q12 and Q13 magnet area next week.

T2 vacuum started today.

One of the cracked insulators is being stored temporarily in the warm cell (it is contaminated), Scott M. will be analyzing the broken ceramic once he has decontaminated it.

 beamlines replaced leaking insulator on q15, circuit #4. See updated pdf for replacement part and location.

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.

Work completed for Thursday:

1) Shielding filler blocks removed from M9Q1Q2 hole. Highest field was 5mSv/h coming from TSH0081 on the end facing the monolith. Blocks and frame had 1000-1200 CPM of contamination.

2) Filler blocks were placed in bunker formed by 18' shielding blocks. An additional 18' block was placed over the bunker to shield the south mezzanine from the field coming from the filler blocks. Bridge setup around M9T2 hole reconfigured slightly for fall protection purposes.

3) Blanking plate nuts on T2M9 exit port were tightened by 1/2 turn at 16:00 (first West side then east, by 1/4 increments. eg 1/4 + 1/4 West, 1/4 + 1/4 East). No immediate effect on vacuum observed.

Attached is survey of steel filler shielding blocks. Contamination on the support frame is unknown, either 0 contamination or not recorded.

work to prepare for installation of alignment jigs on T2M9 and M9B1 continues:

1) Vented T2 volume and removed M9 blanking plate. Volume was not fully vented so plate was stuck and had to be pried off slightly. Around 2 turns of the nuts were required to undo the spring eyes, this is likely less than the total number of turns that were used to tighten the assembly since the indium knife embeds itself in the indium. Blank off is currently bagged in the hot block bunker.

2) Visual inspection of indium impression: 3 knife steps seen all around, east and west sides have indium that look like they have made contact with the bottom of the counter bore. Top and bottom have show distinct "oozing out", but not flattened.

3) Blank off plate fields: 3.9mSv/h on contact, 200µSv/h @ 1/2m. contamination on indium area: 5500 cpm on 44-2, 22000 cpm on rm14; contamination on central aluminum only area: 1300 cpm on 44-2, 1000 cpm on rm14.

1) Visual inspection of T2 M9 flange: no obvious indium deposits on T2 flange knife edge seen, left over indium from before 2013 is still present on counter bore. See screen captures. Screen captures show state of flange after removing blanking plate, no cleaning was performed after removal.

2) Rlanking plate with rubber seal installed on T2M9 exit port at noon. T2 volume pumping started around 13:00.

2)  Plot of pressure over a week period of 1ACG3, units in Torr:

1) Vented T2 and removed rubber seal blanking plate, vacuum level appeared to be at normal operating ranges prior to the indium seal developing a small leak.

2) Removed B1 dust cover, cover was stuck to B1 flange due to oil residue. Oil residue is believed to be from a vacuum pump being turned on in the disconnected section of M9B line. Residue was seen on the bottom half of the B1 to Q2 flange, it was cleaned off using a cotton glove and acetone attached to a 20ft pole. Attempting to clean with wipealls left lint behind.

3) Mushroom pad jig installed in place, shielding reconfigured and platform plates in place. Target flanges to be installed tomorrow.