1. Coldex disinstallation
4/12/2009

2. COLDEX – the history
Designed in 1994 as simulation of a LHC vacuum chamber. Constructed at NIKHEF and delivered in 1997 after acceptance tests.
Installed successively in EPA, in 2 different lines, in synchrotron radiation then positron and electron beams, between 1999 and 2001
Installed in b.113 for cryosorber studies with gas injection, 2001.
Installed in SPS in 2002 close to the WAMPAC calorimeter, to measure heat loads and pressure dynamics induced by electron cloud in LHC type beams
A modular, versatile test-bench, simulating an extended vacuum chamber at cold. Operated with 20,000l dewar or refrigerator.
Recuperation for further studies (LHC related) is highly attractive, if not yet necessary
If CC is NOT installed in BA4, COLDEX should stay in place
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3. Coldex in BA4 Drift bypass WAMPAC Y-chambers Translation tables
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4. Coldex schematic layout
Coldex cryostat
Phase separator 50l
Gas injection system
Reference chamber with vacuum equipment
Vacuum and helium pumps
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5. Coldex mechanical layout
Vacuum sector valves
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6. Disinstallation steps
Uncabling
Removal of ancillary equipment (helium pumping, primary vacuum pumps, bakeout racks, local power supplies, cable trays) → see 7
Removal of flexible transfer lines
Stripping of experiment core: bellows, etc
Removal of adjustment tables, substitution by temporary supports
Disconnection of Coldex (4m) from Y-chambers
Removal of Coldex
Removal of Y-chambers
Removal of Wampac
Preliminary time estimation: >2 weeks
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7. Environment
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8. Re-installation steps
Installation of replacement drift section
Recuperation of 2 VVSB sector valve (make 1 sector out of two, install a VVSA) → Spares 30kCHF to HiRadMat budget
Modification of controls, PVSS supervision or
Leave vacuum sectorization as, it is, blocking 2 expensive VVSB valves, but nothing to be done on vacuum controls
Recuperation for CC
Refrigerator
Transfer lines? To negociate with Coldex owners…
Translation tables? 0.5 tons versus 5 tons
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9. To conclude…
Removing Coldex and substituting it with a drift section is possible
However, LHC has not delivered all possible problems yet, so if CC is not installed in BA4 Coldex should remain in place
Disinstallation should take recuperation into account: quite long disintallation project with respect to shutdown times (2-3 weeks, to be better evaluated with Coldex experts)
4/12/2009