21 April 1995 To: Distribution: From: Stan Ecklund Subject: "IR +- 1m Engineering" Meeting Notes 21 April 1995 We discussed the current drawing with treaty line. Outer radius of uniform section of B1 is larger than some previous magnets but is workable. Martin wants 2 mm for adjustment of PM material.(note strength changes about 1%/mm for larger blocks at outboard end of magnet) The gimbals should be closer to centered on the first block. Magnet is cantilevered from the back end. It supports the vacuum-mask chamber at the B1 end by a contact with low thermal conductivity. John H. reported that asymmetric heating causes 0.03 mm sagitta in the B1 mask-vacuum tube; maximum stress is 18 KPSI compressive. These numbers are considered small and not a problem. Thermal calculations of B1 block uniformity will depend strongly on assumed conduction for epoxy used to hold PM material in collar. Next he will work on cooling channel layout. The temperature specs for B1 uniformity and stability need to be decided. Working number is presently 1 deg C rms, which may be conservative(?). Recall dM/dT = 0.03%/degC. We discuss how to control (feedback) water cooling temperature on mask and magnet. At this point we believe we can have (afford) any temperature control loop desired. Inputs from block and mask temperature as well as beam current are likely needed. The support and alignment of B1 was discussed. Roy pointed out that the known cable and cooling channels in the support tube now occupy a 1 cm thick ring, for 75% of azimuth. (see last weeks transparencies) Hobey showed a list of parameters and cables etc. in the support tube. If you have additions give them to Hobey. Action Items: 1. Mask Cooling Channels / Temperature uniformity. [John H.] 2. Temperature Specifications for B1, Q1. [] 3 Update drawing: [Martin Nordby, Fred Goozen] Move location of SVT gimbals. Radiation detectors. Latest mask, B1 block dimensions. Shielding, BPM, Radial Ion pump,... 4. Number and location of holes in support barrel. [Gordon] 5. HOM RF calculations with new mask geometry. [Eddie Lin] Next Meeting: 13:00 Friday 28 April 1995 in the Yellow room with TV to LBL attachments: Transparencies Cables and Services Coming Out of Support Barrel HDeS 4/21/95 Mainly I'm concerned here with space issues. Most cables come out both ends of support barrel. 1. SVT (Electronics for Si strips; cable drivers) Cables Signal Power Position Sensor Cooling Power Water lines Dry N2 T sensors 2. Be Beampipe Cooling Power Water lines (Back end only) T sensors 3. Detector Protection Radiation Monitors Cables Signal Power/Voltage 4. B1 Cable B sensor? Cooling Power Water lines T sensors 5. B1 Beampipe HEB, LEB sides may differ Cooling Power Water lines T sensors 6. Q1 Cooling Power Water lines T sensors 7. Q1 Beampipe Cooling Power Water lines T sensors 8. Q1 Trim Coil Cables Power Cooling Power Water lines T sensors 9. BPM Cables Signal Cooling T sensors? 10. Pump (NEG, RIP, DIP?) Cables Power, HV Signal Cooling Power Water lines T sensors 11. Support Barrel Itself Cables for barrel motion (outside barrel) Power Signal Strain gauge on C/epoxy? Cooling Control ? T sensors? 12. Radiation Shielding inside Barrel (non-magnetic) Between B1, Q1 Outside Q1