Distribution:
Bob Bell 41
Gordon Bowden 17
Pat Burchat 95
Hobey DeStaebler 17
Jonathan Dorfan 17
Stan Ecklund 17
F. Forti INFN-Pisa
Fred Goozen LBL 50-137
John Hodgson 12
Roy Kerth LBL 50-340
Jim Krebs 41
Eddie Lin 26
Harvey Lynch 41
Tom Mattison 17
Martin Nordby 21
Jeff Richman UCSB Physics
Dept.
Natalie Roe LBL
John Seeman 17
Mike Sullivan 17
Dieter Walz 20
Uli Wienands 17
M. Witherell UCSB Physics
Dept.
Bob Yamamoto LLNL L-287
Mike Zisman LBL
Max Zolotorev 55
19 May 1995
To: Distribution:
From: Stan Ecklund
Subject: "IR +- 1m Engineering" Meeting Notes 19 May 1995
Dieter and Ron Rogers showed the latest water manifolds for the Be
beam pipe. Instead of a vacuum flange, welded islets are proposed
at each end just outboard of the manifold and a short bellows.
Each islet can be cut apart and rewelded several times as needed.
To avoid the problem of losing the epoxy corrosion protection
layer, the outer Be layer could be epoxied in place after vacuum
bake-out. Small 1/8" stainless tubing to feed the manifold is
possible, causing a 16.7 PSI pressure drop. It does make it
impossible to maintain the absolute pressure below one atmosphere,
desirable from the standpoint of water spillage. Pressure drop in
Be pipe is estimated to be 7.7 PSI and 15 PSI for misc.
connections for a total of about 40 PSI.
Dieter detailed considerations regarding cooling with Helium gas.
He concludes that He cooling is not feasible for an assumed power
deposition of 1 KW. Water in concentric Be pipes looks like the
best option. Details in attached transparencies.
John Hodgson report on heat and stress calculations in the B1 mask
with 3 amps in the LER; previous results were for 2.1 amps. At
the hot spot, there are 17.9 watts/mm in a 0.5 mm wide stripe.
This gives a temperature rise is 140 deg C. and compressive stress
of 34600 PSI. This can be improved by moving the water cooling
channel closer to the heat source. The number of cycles of this
stress is large, given that at injection, separating the beams
will move the heat source. Glidcop is rated for 30,000 PSI at
10^7 cycles. We discussed the feasibility of using stronger
materials, such as tungsten alloys and stainless) as a liner in
the mask at the high heat deposition. We will see how the
calculation looks with re configured cooling channels.
Dave Coupal will report on shielding needs in two weeks.
Action Items:
1. Find solution to Q1 interferences. [Martin, Stan, Mike,..]
2. Look for ways to reduce cable interferences. [Roy]
3. Consider ways to make B1 support smaller. [Martin]
4. Temperature Specifications for B1, Q1. []
5. Update drawing: [Martin Nordby, Fred Goozen]
Correct OD of support tube to be 43 cm (TDR value).
Shielding, rotated BPM, Radial Ion pump,...
6. HOM RF calculations with new mask geometry. [Eddie Lin]
7. Check that a rotated BPM misses synchrotron rad fan. [Mike]
8. Maintain list of support tube parameters. [Hobey]
add Q1 radii, offset, support barrel radii,...
9. Can we do with less shielding between B1 and Q1? [D. Coupal]
10. Refine Be cooling flow manifold, details. [Dieter]
11. Required thickness of Q1 containment. [Martin]
12. Mask cooling calculation. [J. Hodgson]
No meeting next week 26 May 1995
Next Meeting: 13:00 Friday 2 June 1995 in the Yellow room with TV
to LBL
attachments: transparencies