Difference between revisions of "2021-06-09"

Revision as of 14:20, 1 June 2021

Meeting Information

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Agenda

Schedule

Long Term Schedule: Gantt (Outstanding tasks)

Supplementary Shielding Installation: Mid-June
Beamline Commissioning / Test Plans / Shielding Verification
7/26/21 Start Hot Check-out
Commission new beam line and execute experiment
Science!!!

New items for discussion:

Short term schedule update:
This week:

Elevated beam line terminated in pump and RGA leak checked
Experimental beam line under vacuum, RGA leak check required (Forecast)
Vacuum pumping down well, but light bake may be required once we have completed installation.

Still to do:

Install target mechanism
Add Mu metal over bellows on wastewater line.

Gun work progressing well:
1. HV chamber evaluation - plan to bake to evaporate lubricant & pump it off, install photocathode, and bake again.
2. Sb source laser aperture added in depo chamber; aligned to laser path.
3. Gun rebuild schedule
4. Minor SF6 leak in HV chamber identified; repair later...

Next Week:

Build 80/20 support structure; Pb table components awaiting delivery.
Wrap up downstream vacuum work
EES may start cabling downstream section & making UED updates.
Break vacuum in FC3 region
Ready to install Al base plates for FC3 region rework as well as solenoid stand. FC3 plate awaiting machining.

2 weeks:

Mount bottle rack in Labyrinth; remove gas bottles to rack.
Unistrut mounting for cables - Neal will do when available
Pull Heliax from Spectrum analyzer/Control room >> Buncher
4th terminal system in Control room under assembly/rebuild
Items from To-do list...

Engineering Other business

Reports on Open Action Items:

Action Items:

Formal run plan (McCaughan)

Back to Main Meeting Minutes Page

@@ Line 22: / Line 22: @@
 <u>Short term schedule update:</u><br>
 <u>This week:</u>
-* Area up to transition after solenoid under vacuum. RGA leak check completed.
+* Elevated beam line terminated in pump and RGA leak checked
-* Downstream viewer / faraday cup assembly under vacuum. RGA leak check completed.
+* Experimental beam line under vacuum, RGA leak check required (Forecast)
-* Last 4 5/8" bpm pulled from elevated line & installed. (One: failed insertion measurements & w/ John Musson, One: stripped tap hole).
-* New valve closed & middle diagnostic cross connected to upstream stuff on 2.75" flanges using bellows & available nipple with 4 5/8" flanges. NEG heated with 1A to drive out H2O. Pump cart is online & pumping @ 1500 Hz (i.e., good). Downstream spool piece + flange also installed. All but ~2 feet of beam line now under vacuum and leak checked.
 * Vacuum pumping down well, but light bake may be required once we have completed installation.
-* Trim cards being pulled by EES-DC for removed magnets on elevated line.
-* Roof tiles off for HDIce & Dilution refrigerator craned out (5/25). Roof tiles replaced again this morning (5/26).
-* Still more vacuum components dropped off to SRF for cleaning. Should probably order some 4 5/8" flanges...
 <u>Still to do:</u>
-*40 L/s ion pump is attached to downstream side of valve on elevated line via a right angle valve & T. When pump cart is available, we need to get this ion pump ON. That puts elevated beam line in safe state, no accidents if valve were to OPEN (it's closed with controls disconnected).
-* Last spool piece [4.5" flange x 24.5" long x 4 5/8" flange] under fabrication. (Note: Pump cart w/ RGA suffering intermittent leak; Matt isolated to 11 L/s pump & 4-way cross joint - 4-way cross new, so swap out 11 L/s pump if it's an issue. One is staged on shelf in cave.) To install:
-*# Ion pumps OFF
-*# Purge with GN2 from both sides, one side through pump cart, the other side through kwik flange with 1/4" compression port.
-*# Use other pump cart from vacuum lab TL1137 (attached to the LIGO tube station) to vent from both sides, with GN2. Wait until Matt's return if desired.
-*# One more pump down and RGA leak check
-*# Add the thin window
-*# Heat / bake beam line
-*# Activate NEGs
-*# Switch Wastewater line vacuum ion pump HV from local supplies to house power / UHV supplies.
-*# Make UED updates as appropriate for vacuum system.
 * Install target mechanism
 * Add Mu metal over bellows on wastewater line.
@@ Line 49: / Line 33: @@
 *# HV chamber evaluation - plan to bake to evaporate lubricant & pump it off, install photocathode, and bake again.
 *# Sb source laser aperture added in depo chamber; aligned to laser path.
-*# Mask alignment examined.
 *# [https://wiki.jlab.org/ciswiki/index.php/Spring_2021_-_Rebuilding_Photogun Gun rebuild schedule]
 *# Minor SF6 leak in HV chamber identified; repair later...