12 May 1995 To: Distribution: From: Stan Ecklund Subject: "IR +- 1m Engineering" Meeting Notes 12 May 1995 We discussed the drawing from Fred with Martins imported machine components. No solution has been found yet for the Q1 interferences and the cable routing. Centering Q1 and supplying a dipole field with a conventional winding can't be made strong enough. Splitting Q1 into two pieces hasn't been tried yet but that will affect orbit which affects masking. Smaller cables haven't been found. Intermediate folds in the cables requires space which is not available. Mike Zisman asked if we can we get along without the Q1 trim, or with a smaller trim than the +-3%. What's needed to do waist scans and physics reach for energy scans?. Jim Krebs asked how long the support tube is. Hobey has said to the outboard end of Q1 for now till we have reason to change it to accomodate details in supports and assembly. Dieter and Ron Rogers described the water manifold at each end of the Be beam pipe. In and out are at upbeam (HER) end and a turn around manifold is on the down beam end. Drawing shows 1 mm water gap; Dieter thinks this could be reduced to 0.5 mm. The manifolds are SS. A problem is how to epoxy coat the Be for corrosion protection and maintain it through brazing or welding the SS-Be joint. Other materials could be used for the outer tube, but nothing beats Be for small radiation lengths. Roy suggested a smaller tube be used for water in/out to manifold till clear of vertex detector. John Hodgson suggested 8 sectors instead of 4 to insure uniform cooling. The question of radiation damage to epoxy was raised. Dieter reported that exposures to 10^10 rad are possible if loaded with Al2O3; 10^8 if not. The correct epoxy must be chosen. The silicon limit is 10^6. Hobey reported that Dave Coupal is working on the shielding to see what is the minimum required amount between B1 and Q1. 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] Switch upbeam(HER) flange and bellows, show flange pair. 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] Next Meeting: 13:00 Friday 19 May 1995 in the Yellow room with TV to LBL attachments: none 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