Logbooks Lab Maintenance Evaporator_1 Evaporator_2 Laser cutter Target Production Test-Stand RH-ISAC RH-Cyclotron RH-Meson Hall RH-Beamlines RH-ARIEL
  RH-Meson Hall  Not logged in ELOG logo
Message ID: 342     Entry time: Thursday, February 01, 2024, 11:14
Author: Albert Kong 
Category: Standard Operation 
Type: Target 1 
Specific: Hot Cell 
Subject: T1-MK1 Flush and Purge on Hot Cell 

The recently removed T1-MK1 target ladder was flushed with city water for ~30s at all target positions. It was then purged with compressed air at ~5 psi for ~1 minute at all target positions. We then left the target ladder in pos5 to fully extend the bellows and allow it to dry overnight.

This ELOG will be updated as we progress with work done to dry the target ladder and eventually exchange the spent targets.

-----------------------------------

UPDATE (Feb 02, 2024): in the morning, the target ladder was moved to pos4, and air was allowed to run through the morning, in the afternoon the ladder was moved to pos2 and air was ran. At the end of the day, the ladder was moved to pos 0 and air was ran through over the weekend.

-----------------------------------

UPDATE (Feb 05, 2024): the following procedures were completed.

  1. the air connections on the target ladder was replaced with the leak test/vacuum connections as per instructions.
  2. LN2 was taken from the ISAC-I facility and used to perform two pump-down cycles with the Agilent He leak detector + cold trap.
  3. First pumpdown cycle: 3min45sec to go from roughing to fine pumping, left for a total pumpdown time of1hr20mins, a relatively small amount of ice formed on the cold trap cylinder (see image).
  4. Second pumpdown cycle: 2min30sec to go from roughing to fine pumping, 4min30sec to reach 1e-3 Torr, 5min to reach < 1e-3 Torr. 
  5. Due to good pumpdown in the second cycle, we proceeded with leak testing: Baseling 1.0e-10 Torr-L/sec | ~1 sec He applications at 3.5 Psi directed at fittings/welds/bellows. Worse case measured leak was 0.9e-7 Torr-l/sec in pos 13 of fig 12 of Document 46600 (see taken image for detailed measurements at various locations).

We will prepare an update to the procedure to better log the leak rate measurements and update this ELOG/the procedure. Note that ice removed from second pumpdown was actually comparable to the first (see image, ice knocked off during cold trap removal), but total pumpdown duration (including leak testing) was ~4 hours for the second pumpdown. 

 UPDATE (Feb 13, 2024): see attached record with new template.

 

Attachment 1: IMG_3950.JPEG  2.526 MB  Uploaded Monday, February 05, 2024, 15:10  | Show | Hide all
Attachment 2: IMG_3975.JPEG  2.394 MB  Uploaded Monday, February 05, 2024, 15:17  | Hide | Hide all
IMG_3975.JPEG
Attachment 3: IMG_3973.JPEG  2.140 MB  Uploaded Monday, February 05, 2024, 15:21  | Show | Hide all
Attachment 4: IMG_3971.JPEG  1.980 MB  Uploaded Monday, February 05, 2024, 15:34  | Show | Hide all
Attachment 5: T1&T2_Pump-Down_and_Leak_Check_Record_05_FEB_2024.pdf  799 kB  Uploaded Tuesday, February 13, 2024, 16:44  | Show | Hide all
ELOG V2.9.2-2455