Wednesday, October 9, 2013 2:00pm EST
From Hall A Wiki
Last group meeting: Wednesday, June 12, 2013 10:30am EST
Last meeting: Monday, October 7, 2013 2:00pm EST
Agenda
These presentations may be updated right before the meeting
- Status of the engineering work
- Update from Jason on support structure .pptx .pdf
backup:
presentation from June
Tyler's interference slides - Update from Jim on vacuum vessel .pptx .pdf
- Update from Jason on support structure .pptx .pdf
- Update on the physics/optics work
Minutes
Attending: Juliette, Robin, Stanley, Jim, Jason, Jay, Kent, KK, Thia, Javier, Roger
- Status of the engineering work
- Update from Jason on support structure
- green and blue are Al strongbacks; pink blocks are Al with coil
- slide 7 doesn't include bolted connections
- Slide 9 Questions:
- Could top piece be an I-beam? - Needs strength in both directions.
- Is this assembly made and then assembled? - yes - coil is pre-assembled with carrier.
- Slide 10 Questions:
- Isn't ~1mm too big? Comparison is between clamped vs. 6 strut. But aren't they both too big? Small perturbation and sensitivity study (not completed yet) seems to indicate that this would be okay. Also doesn't include the other braces - just has carrier and coil.
- Why strut - why not another support structure? Takes more alignment...
- Have you considered overturning moments? once support is chosen they will do this study
- Deform them ahead of time? Already will have imperfections, trying to pre-deform is not going to matter
- Slide 11 Questions?
- How close is deflection to the center-of-mass of the coil? Slide 10 shows pink arrows at COM.
- Slide 16 Questions
- inter-coil support would reduce or eliminate the ability to adjust coil positions
- deflections with 6-strut will be better (these are for clamped ends)
- Slide 17 Questions
- what causes deflections - hanging forces are from weight (centering force cancels)
- Slide 19 Questions
- frame is made from box beam, as shown
- what are the limitations on supporting the frame
- Suggestions: Get 25 ft long pieces and impregnate them and try to get Young's modulus
- Update from Jim on vacuum vessel
- 19000 lbs is vacuum chamber only
- total ~ 40,000 lbs roughly (20 ton crane in hall - radius far enough)
- He bags complicate vacuum connections, affect backgrounds, optics, rate loss, radiative corrections...
- How to support the vacuum vessel and pump it?
- Questions;
- Has the coil been shown to any vendors yet? <- Robin needs this.
- Where does the water and power come in? on the top plate; from coil needs to be designed
- to replace a coil - remove top flange, remove coil; need support for magnet frame assembly, magnet mapping assembly, etc.
- what if we see something weird in the experiment - take it apart and diagnose
- will need to run for a while (several days to a week) in air to test it
- Update from Jason on support structure
- Update on the physics/optics work
- Update from Juliette on iron simulations
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