Wednesday June 11, 2014

We will meet in TL 2236 on Wednesday June 11 at 3:30 pm EST.

For those calling in we'll use the ReadyTalk audio conference system.

1. Dial Toll-Free Number: 866-740-1260 (U.S. & Canada)
2. Enter 7-digit access code 4402297, followed by “#”

Agenda:

1 - Bubble Chamber progress at Argonne

2 - (Grames) Beam line progress at JLab:

* Coordination meeting (May 28) media:140527_BubbleInstallKickoff.pptx media:140527_BubbleInstallKickoff.pdf

* Review final girder components

Assembly media:JL0015130 COLLIMATOR TABLE ASSEMBLY.pdf

Radiator media:JL0015733 CU RADIATOR WINDOW ASSY.pdf

Collimator media:JL0015777 CU COLLIMATOR.pdf

* BPM bench top calibration using Goubau surface wave transmission line (G-line) technique

3 - (All) How to proceed with readiness review (beam line, safety, radiological, commissioning plan, ?) so the beam line is ready for commissioning at the end of summer ?

---

Notes from this meeting:

• PAC41 listed the Bubble Chamber as a High Impact experiment.

• Bubble Chamber is filled with N₂O.
• ... mercury, glass, and N₂O problem ...
• When attempted to vent the beamline to install the Fast Valve, it was found that the valve immediately after the 1/4 cryo-unit is leaking. It was decided to warm the 1/4 cryo-unit to room temperature and replace the leaky valve.
• The new magnet alignment fixture has been built.
• Dave and Brad will decide on who and where the collimator will be built. The design is complete and the drawing is ready.
• Radiator design has been completed.
• The chamber location may have to be pushed downstream by an inch or two to allow for the thermal insulation. The chamber will be running at -12 to -14 °C. Instead of having the Survey and Alignment group marking 4 points on the floor for the chamber, they will mark two parallel line.

• The beamline two BPMs will be calibrated using G-line technique. The goal is to improve the absolute beam position measurements needed for the energy determination.
• Rolf and Arne will decide on the exact framework of the Bubble Chamber Readiness Review but expected to be like PEPPo:

1. Conduct of Operations (COO)
2. Experiment Safety Assessment Document (ESAD)
3. Radiation Safety Assessment Document (RSAD)
4. Beamline Review
5. Bubble Chamber Safety Review:
   1. Pressure System
   2. Mercury
   3. Laughing Gas
   4. Operational Safety Procedure (OSP)

• Claudio, Simona, Darren, and Wouter have started the work on GEANT4 simulation of the Bubble Chamber.
• ... Claudio plans for a gamma detector ...