Wednesday July 9, 2014

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We will meet in TL 2236 on Wednesday July 9 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 “#”


1- Bubble Chamber progress at Argonne

2- Summer Shutdown Installation:

JLab beam line fabrication update
Argonne installation at CEBAF
1. Rack space, cable pulls, and remote operation
140702 BubblePlanningLayout.JPG
2. What is plan and timeline for moving components to JLab, installing at CEBAF, testing?

3- Fall Operations:

Accelerator Run Period is September 19 - December 22
How about we generate a draft commissioning plan to understand tasks, requirements, goals?

4- General Info: ReadyTalk ends August 1st. Migrating to Blue Jeans [1]

Notes from this meeting:

  • Bubble Chamber: still looking for a solution to the nucleation at the interface between mercury and the N2O.
  1. Tried CO2 but the problem got worse. Also tried C4F10 as a superheated fluid but still faced the same problem.
  2. Tried C4F10 as an intermediate buffer fluid but it mixes with N2O.
  3. Concluded that it is not a result of thermal hot spot on the surface of mercury nor it is a result of contaminated mercury.
  4. Next:
    1. Will try differentially cooled mercury,
    2. Otherwise will have to design and build a new chamber with no buffer fluid.
  • Beamline drawings submitted to machine shop and due back at the start of August. The installation is planned in August and to be completed by the end of August.
  • Meekins will make the collimator from copper on site (i.e, we do not need the copper from Argonne).
  • Argonne to provide a list of cables needed to run the bubble chamber.
  • Planning to measure the photon spectra using a germanium detector. Will check with the Detector Group and with RadCon to see if we can borrow one.