Some Recent BNL, LBNL and Yale Work 1. Honeycomb flatness from manufacturer 2. Commercially fabricated C-channel 3. VCR Fittings 4. BN powder thermal evaluations 5. Facing sample for electrical contact 1 D. Lynn, Local Support Vidyo Meeting Jan 23 2015
24
Embed
Some Recent BNL, LBNL and Yale Work 1.Honeycomb flatness from manufacturer 2.Commercially fabricated C-channel 3.VCR Fittings 4.BN powder thermal evaluations.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
Some Recent BNL, LBNL and Yale Work
1. Honeycomb flatness from manufacturer
2. Commercially fabricated C-channel
3. VCR Fittings
4. BN powder thermal evaluations
5. Facing sample for electrical contact
D. Lynn, Local Support Vidyo Meeting Jan 23 2015
2
Honeycomb Flatness
•Along with DESY and Liverpool BNL placed common order for new vented honeycomb
•BNL would like to investigate possibility to avoid grinding honeycomb. Need tighter tolerance on flatness. So BNL ordered two slices with tighter tolerance with of cost increase of about 6%.
3
Honeycomb Flatness
•Ultracor gives the following conformance data. Measurements at 6 locations per slice.
•All measurements were within specification
4
Honeycomb Flatness
• Spacing was 4” by 3”• Tolerance on both sheets within +/- .002” (50 um)•Can UK and DESY measure theirs?•Unfortunately all honeycomb slices were
deliberately oversized at 5.5 mm (to grind to 5.2 mm).•Do we make a slightly thicker stave to test concept?
• To compare, BNL made 35 measurements per slide in a grid pattern as shown below.
5
Carbon Fiber C-Channels as Received from Allred/Dragonplate4 December, 2014
W. Emmet/T. HurteauYale University Physics Department
• Vacuum at 10-5 mBar• Ramp up to 750 oC over 2 hours• Hold for 8 minutes at 750 oC• Ramp up to 820 oC over ~30 minutes• Turn off heat and allow to cool down under vacuum (take several hours)
• Whole process takes about a day• Sample also brazed at Solar Industries using same recipe
16
Yale SS VCR to Ti Pipe Brazing
1A 1B
2A 2B
17
Solar SS VCR to Ti Pipe Brazing
1A 1B
2A 2B
18
First samples of Yale and Solar brazing had VCR fitting bore diameter about 1-1.5 thousandths larger the Ti pipe. Solar says want almost pressure fit to get a fillet
Both Yale and Solar samples were hydro pressure tested to 3500 PSI (~230 bar) for one day and showed no signs of leaking, i.e. no pressure change
Sent second small sample to Solar Industries; has approximately 0.5 thousandths larger diameter.
Full length Titanium tube will be vacuum brazed at Solar Industries following inspection/hydro pressure test of the second sample’s tighter-fitting VCR-titanium joints.
Titanium VCR Fittings
19
Titanium VCR Fittings
At Sep 2014 ITK meeting Richard French asked us to look into whether Swagelok would make Titanium VCR fittings. In principle should be easier to braze to Titanium pipe. He was having difficulty with Swagelok contacts in the UK.
Will Emmet got first quote for Ti blind gland (we prefer blind gland so that we can drill gland to accommodate different diameter Ti pipes in case that dimension changes
First quote was for $466/each (similar to what Richard was getting).
Will used old contact to get quote down to $52 each.
We have ordered a quantity of 50. 15-16 week delivery.
20
BN powder study
• Carl had mentioned they have access to an expensive machine that is designed to measure thermal conductivity; sorry, I don’t have the details at the moment.
• We decided it would be a good opportunity to use machine to compare the different BN powders currently in use.
• Graham also want to compare thermal conductivity with his device.
• Use 10%, 20%, and 30% BN powder (by weight).
• BNL/Yale: ZYP
• UK: Goodfellows
• DESY: PT140 (but we also obtained PT180…different particle size)
21
BN powder study, sample list
BN Powder Percentage BN by weightLength Width Thickness Final Weight
For Carl [grams]1 ZYP 30 30 8.1 10% A 8.52 ZYP 30 30 8.1 10% B 8.63 PT140 30 30 8.1 10% A 8.64 PT140 30 30 8.1 10% B 8.65 PT180 30 30 8.1 10% A 8.86 PT180 30 30 8.1 10% B 8.87 GoodFellows 30 30 8.1 10% A 8.68 GoodFellows 30 30 8.1 10% B 8.69 ZYP 30 30 8.1 20% A 8.5
10 ZYP 30 30 8.1 20% B 8.711 PT140 30 30 8.1 20% A 8.612 PT140 30 30 8.1 20% B 8.513 PT180 30 30 8.1 20% A 8.714 PT180 30 30 8.1 20% B 8.915 GoodFellows 30 30 8.1 20% A 8.316 GoodFellows 30 30 8.1 20% B 8.417 ZYP 30 30 8.1 30% A 8.818 ZYP 30 30 8.1 30% B 9.119 PT140 30 30 8.1 30% A 8.720 PT140 30 30 8.1 30% B 8.921 PT180 30 30 8.1 30% A 9.122 PT180 30 30 8.1 30% B 9.223 GoodFellows 30 30 8.1 30% A 924 GoodFellows 30 30 8.1 30% B 8.8