1 SLAC RC Status Report 19 July 2010 LHC Collimation Working Group Meeting Jeff Smith/SLAC BNL - FNAL- LBNL - SLAC US LHC Accelerator Research Program.

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Presentation transcript:

1 SLAC RC Status Report 19 July 2010 LHC Collimation Working Group Meeting Jeff Smith/SLAC BNL - FNAL- LBNL - SLAC US LHC Accelerator Research Program

2 Even more testing of rotation drives and actuators Finished jaw bearing fixes Independent method to verify proper facet positioning Activities Since 7/5/2010 Status Report

3 Independently measure angular position of jaws Discovering that the rotation mechanism will miss ratchets. The pawl helps but still cannot guarantee no missed ratchets. The Geneva Mechanism helps insulate the jaw from missed ratchets Nevertheless, we want an independent way to directly measure the angular position of the jaw. A solution for a future collimator may be a resolver attached directly to the end of the jaw For this prototype we believe using an optical sight and scribe lines on each facet will work well. Given the angular precision of the jaw (0.154 degrees), a scribe line on the facet must be sighted to within 180 microns -- not a problem. Optical survey equipment can do much better Maybe could set up a camera to image the sight but for now, “by eye” is fine

4 Scribe Lines In addition to aligning the jaw, the scribe lines will also allow us to label each jaw We want the position of the jaw to be always obvious by simply looking at it This means don’t rely on log books and counting times it was rotated By simply looking at the jaw it will be obvious which facet is facing the beam. Facet # 7Facet # 14 Line to “sight” Facet label

5 Sighting scribe lines with scope Sight facet scribe line with two reticles to remove parallax JawViewport Reticle #1Reticle #2

6 Survey Jaw Position JawViewport Once vacuum chamber is welded shut we need to survey in the jaws relative to the drive table reference points Viewport windows can be surveyed in traditionally with the drive table Then use laser micrometer to measure the distance between the viewport window and the jaw surface. Should be able to get 5 micron precision on Jaw position can simultaneously view several transparent surfaces

7 RC Tasks to Complete Complete rotation drive tests in lab Switch out all stainless screws for molybdenum screws Fabricate the final 4 “wavy arcs” for contact resistance & Rhodium plate Fabricate 4 mounting brackets for arcs, thermistors & RF foils Fabricate scribe scope and scribe facets Final cleaning: Acetone & alcohol for all parts Chemical cleaning of upper vacuum tank vessel Bellows already vacuum fired & leak checked In a real clean room Weld bellows to jaw supports & to baseplate Reassemble jaws on baseplate Vu tubing now bent down & brazed to feedthroughs Final alignment, survey & test of all parts Weld vacuum tank & test rotation drive Vacuum bakeout & final test of rotation drive Immobilize, protect, install shock monitors and do paperwork for shipping

8 Reference Material Follows

9 SLAC design details Ratchet Gear Drive RC-0 Jaw (copper)RC-1 Jaw (Glidcop)LHC IR7 Style BPM Buttons 4 per end Flex SupportTank geometry allows a 60mm facet-to-facet gap in fully retracted Jaw position Ferrite could mount to Base Plate facing Jaw facet BPM assemblies at each end are fiducialized to Collimator Base Plate Drive Mechanism RF foils carry image current and shields Rot. Mech.