Micro Pot Prototype Work in Progress Jaak Lippmaa
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Micro. Pot Prototype Work in Progress Jaak Lippmaa Helsinki Group, Helsinki Institute of Physics, University of Helsinki CERN, February, 2006 1
Manchester Criteria • Detectors are in secondary vacuum • Access to detectors and/or positioning mechanics without interrupting LHC • Minimum number of degrees of freedom (should reduce mechanical jamming risk) • At least 5 micron positioning accuracy • Bake without detectors installed • Transfer cryostat Modification 3 (Sebastien’s prposal) CERN 15 February 2006 Micro. Pot Prototype Jaak Lippmaa 2
Mechanical Considerations • Very limited space available around beam pipes • Accurate distances not known • Virtually no room outside the transfer cryostat • Mechanical support structure not clear • Primary vacuum cannot be broken once the pot is installed CERN 15 February 2006 Micro. Pot Prototype Jaak Lippmaa 3
Manchester Proposal – Tilted Pot Proton Beam Emergency Stops Tilt 13º Stepper Motor Bellows Outer Weld Points Beam Pipe Flange Primary Vacuum Detector Det ecto rm ove men t Secondary Vacuum CERN 15 February 2006 CWT (optional) Rest Stops Micro. Pot Prototype Feedthroughs Jaak Lippmaa 4
Roadmap to Successful Prototype • Design criteria – maximum use of COTS components • Prototype basic design ready in March • Components ordered in April/May • Prototype building in June • Beamtest at FNAL in July/August • Plans for Prototype II CERN 15 February 2006 Micro. Pot Prototype Jaak Lippmaa 5
We we are at the moment • Several alternative designs were considered (vertical, horizontal, tilted. . . ) • Rigidity is a major concern • Smoothness of movement is a concern • Possible damage to positioning mechanism during emergency stops • Vacuum force compensation • Cooling of detectors needs to be decided • There is at least 30 mm (z-axis) for detectors • We need the detector module weight to calculate cantilever loads to the slider • We need urgently the number of leads for feedthroughs CERN 15 February 2006 Micro. Pot Prototype Jaak Lippmaa 6
Status • Detectors in secondary vacuum, slider in air, primary vacuum shielded prototype • Manufacturers of COTS components have been identified • Negotiations for pricing and detailed specs have started • Design is being reviewed for overall mechanical stability and rigidity • COTS component compatibility review is about to start • Component list does not rule out alternative designs • Co-operation with UTA confirmed CERN 15 February 2006 Micro. Pot Prototype Jaak Lippmaa 7
CERN 15 February 2006 Micro. Pot Prototype Jaak Lippmaa 8
