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