T1 M13Q1Q2 work continued:

- Removed T1 Q1 indium seal ring, collapsed center vacuum box bellows using pneumatic cylinders. The bellows restraint was able to be rotated slightly so that the cylinders could be retracted. The brace/restraint bar could only be rotated until the bar made contact with the electrical connectors on Q1.

- T1 Q1 pins driven back down to anchor Q1 vacuum box.

- Separated Q2 B1 joint: Q2 vacuum box spring eyes are still partially trapped. Vacuum box cannot fully retract due to the bar from the bellows bracing/restraint contacting the field plate on Q1 magnet. The joint will have to be manually separated with some other means.

RH beam line work for UCN continues at T1.

- Attempted to scrape t1 flange, narrow scraping tool does not fit into space because of the headers on the water system of the magnet. Decided to continue installing blanking plate with rubber anyway.

- Installed blanking plate between T1 and M13Q1 with rubber.

• Q2B1 joint was closed up and pins driven down to anchor the vacuum box in place.
• Joint was opened and then blanking plate was inserted into place against T1 flange. Q1Q2 vacuum chamber was extended to preload the plate.
• The flange needed to be adjusted into place slightly and then the pins driven down to load the plate further where it then needed to be pried into position. After this the pins could be driven down completely.
• Bolt stops on the Q1 flange that brace against the magnet were seen in video inspection. Also bolt lugs like as on the M9 and M20 vacuum box were seen although without bolts present in them.

- Q2B1 joint was disconnected again. Spring eyes are still not fully clear enough to lift away B2 magnet.

work continues on T1 M13 area for UCN.

- He leak checked T1 M13Q1 joint (sealed with rubber) and surrounding uncovered area, no leaks found.

- Moved back B1 jaws box enough to clear the spring eyes on the Q2 vacuum box.

• Removed and vacuumed bags of lead shot that were placed on the vacuum box between jaws box and bender magnet coils. Some loose shot fell on the floor.
• Did this by loosening the restraining screws of the vacuum box on either end of the magnet (on top only)
• Removed 2 C clamps holding the jaws box down to the magnet subframe (J. Chak and L. Lee pried clamps off)
• J. Chak pried downstream end of vacuum box to shift the jaws box by the required 1/4 inch

- Tidied work area in preperation for removing the bridge setup and to remove the B1 magnet.

- The water line to the T1(?) water cooled indium ring is leaking water near the top of the target station, water system was shut off. The leaking swage lock fitting must be replaced.

Removed M13 B1 magnet from beam line without issues, Q2 vacuum box is covered with bag and vacuum box "extended" with air off. Field is now 3000uSv @ 1/2m from the open vacuum box where B1 magnet was.

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

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.

Blanking plate with indium between T1 and M13Q1 flange has been installed, joint will be He leak checked tomorrow. Vac group informs that pumping of T1 volume will start this afternoon going over night.

- The spring eyes on Q2 vacuum box are ~0.2" above the pin supports, the gap changes by 0.05" between open and closed positions.

- Pin drives were driven down to 34 turns (left a 1/8" gap between the bar and the top of the T1 flange)

- A thermocouple wire was attached to the blanking plate, leads are not yet connected however.

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.

1) Quick connect fittings on the rotary collimator were leaking (the two red collared fittings in photo below).

Replaced quick disconnect connectors on rotary collimator with compression fitting unions and bypassed the bulk head on the collimator, water hoses are hanging loose.

1. (top) supply line has an additional union + spliced line 90deg section
2. (bottom) is return line

The hoses should be shut off at their supply and then disconnected by undoing the fittings, if the collimator is to be removed. 

2) Replaced leaking fitting on 1AQ9 water cooled indium joint. Copper refrigerator tubing that runs down the shielding block cable chase that feeds T1 from the water package. Replaced both return and supply section as they were corroded (joined) together. Unsure which is supply or which is return line, or if it matters.

Final state of top of collimator area in picture below, inlet and outlet tagged (2015 mar 5).

2015 mar 6: the replaced supply joint was leaking a small amount of water through one of the union joints, decided to remove both the suspect union joints and connect the metal hose to the copper line. Appears to be okay/dry.

Started to uncover and create work space around T2 M9 area, setup is mostly complete. Some misc items to be craned into position. RH set up is mostly to do He leak checking of 1A beamline due to vacuum leak somewhere in the area around T2, bridge on B1 side of M9 has not been set yet.

1) Block and bridge setup is mostly complete for T2 M9 sighting job. Waiting on approving drawing TB22322 in order to continue with installing sighting equipment.

2) He leak checked upstream of T2 and surrounding area. Appears to be a small leak at the M9T2 exit port through the blanking plate seal. Mode of failure undetermined at this time. Leak does not impact operation of beam line 1A according to vacuum group.

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.

Continued with installation of target jigs:

1) Craned in equipment for alignment group.

2) Attempted to install target jig over B1 flange;

- Not enough horizontal distance south of B1 flange to install the target flange vertically and into place, jig must be maneuvered in side ways from the east of B1 into position.

- Spring eyes were designed such that after driving the taper pins into place the spring eyes were not being loaded due to a lack of allowing for spring compression. Design is being studied to fix this problem.

- B1 sighting flange was subsequently removed and one spring eye removed from the assembly (taper pins were left partially engaged in the top ear of the T2 M9 @70 Turns up (20 turns down)). Total amount of turns to drive down pins is 90 turns.

3) T2 M9 Q1 8" sighting jig was installed into place successfully

- Threaded pole used to install the 8" jig could not be unscrewed due to the pole tool securing nuts interfering with the pole used to install the pin drive (no clearance for tools). Poles are to be left in situ, screwed into their respective equipment until job is completed.

3) Alignment group sighted the T2Q1 target flange and the mushroom pad jig. They will continue on Monday with the B1 flange should the spring eye problem be addressed by then.

Yesterday:

1) Addressed mounting issue with the 15" alignment jig: removed material from the spring eye to make the hole from 1" to 0.75" when bottomed out. This would cause the spring eye and mounting eyelets on B1 to have 0.226" of starting overlap, vs the original 0.024" negative overlap previously seen.

2) M9B1 15" pin drive was removed along with the securing bolt. The bearing block on the pin drive had seized up and could not be rotated. It was decided to remove the screw drive from the pins and drive down the pin assembly in a manner similar to installing the 8" target. Installation of the 15" jig will continue today.

Today:

1) installed 15" and 8" sighting jigs, Beamlines group completed multiple passes for measurements. 15" pin drive was installed without the drive mechanism which was seized, pins were slipped into place (same procedure as 8" rubber seal blanking plate).

2) Reinstalled dust cover on to B1 flange, wiped off vacuum pump (?) oil from inner side of cover with acetone. Also wiped B1 flange with acetone + lint free cloth. The inner surface of the B1 flange and knife edge will need to be cleaned with specialized tooling.

3) 15" pin drive was replaced as follows: Seized screw drive was partially re-threaded into the taper pins, pins were lowered into place into receiving holes and the hook block that locates the pin drive was re-engaged. The pin drive securing bolt was left out. Not that this particular pin drive is not to be used in the future, high field parts were replaced for storage purposes.

Yesterday (Apr 15):

1) Installed TB22265 on to M9 exit port at 18:48 with no vacuum and left over night. Done per 2013 installation procedure (1.5 turns of the preload nut, after pins are engaged and springs are at free length)

 - On this installation, the nuts (TB22264) and tool block (TB22263) were reused from the 2013 blanking plate. The blanking plate (TB22267), spring eyes, springs and washers were new parts. Reused parts were 900 uSv/h on contact and 50 uSv/h @ 1/2m.

 - Spring eye, spring eye washers and nuts had fitment issues due to manufacturing errors. No dry fitting of parts was performed before hand. Spring eye used was a new style single piece machined type.

 - Selected springs were used in this installation: East spring rate: 4762 lbs/in, West spring rate 4972 lbs/in. See attached spreadsheet for spring rate test details.

2) 2013 TB22265 (previous) blanking plate was discovered to have a stuck spring eye on the East side.

 - Spring eye would not rotate or slide freely when moved by hand. Upon removing the spring eye with a mallet, evidence of aluminum galling could be seen.

 - Pin diameters measured were .499, diameters on drawing were .497 -.002/+.0. Specified hole diameter on blanking plate is .500 +.001/-.0. These spring eyes were of the 2pc welded type.

 - Despite larger than drawing size, west spring eye could still slide freely. On east spring eye near the welded area filing marks could be seen near the galling. This area measured .4995 at one point.

- Suspect this manufacturing defect (a lump) caused the spring eye to bind and cause the indium knife to stop advancing.

Today (Apr 16):

1) Leak checked blank off after leaving clamped over night. Vacuum pumping started at 9:00, leak check began at 11:00. Appears to be leak tight. (leak check results attached)

- Spring eye gaps appear to be the same as the previous day.

2) Began tear down of bridge and shielding setup.

- Surveyed the following radioactive items for storage in RH lead flask:

- M9 B1 pin drive hold down bolt; 800 uSv/h on contact,  50uSv/h @ 0.5 m. no removable contamination.

- TB22265 2013 blank off; 3900 uSv/h on contact, 200 uSv/h @ 0.5 m. 3000 cpm, on gamma detector (44-2) and 1600 cpm contamination on RM-14.