21/11/2002 Muon MeetingBurkhard Schmidt Envelopes and Clearances Outline: Definitions General situation Request of Calorimeter group.

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Presentation transcript:

21/11/2002 Muon MeetingBurkhard Schmidt Envelopes and Clearances Outline: Definitions General situation Request of Calorimeter group

21/11/2002 Muon MeetingBurkhard Schmidt Envelopes and Clearances Outline: Definitions General situation Request of Calorimeter group Definitions: (provided by our TC) Envelope of a detector consists of: +Mechanical dimensions +Mechanical tolerances, piled up if composite +Possible operational deformations (e.g.: bending, overpressure) Clearance: –Space between envelopes, this is "No-man's land" governed by the Technical Coordination -> These two issues were mixed up to now !

21/11/2002 Muon MeetingBurkhard Schmidt Envelopes and Clearances General situation: Tight, in particular around the calorimeters (only 1cm between PS, ECAL, HCAL and M2) Proposal: (of our TC) The only way to get more space is to shift the detector downstream by up to 10cm (maximum) ->The group to whom the space downstream the experiment is allocated (beam pipe) agrees ->What about us? Also for us the situation is tight!

21/11/2002 Muon MeetingBurkhard Schmidt Envelopes and Clearances Proposal (ctd.): (of our TC)

21/11/2002 Muon MeetingBurkhard Schmidt Envelopes and Clearances Proposal (ctd.): In order to adjust to the new mean station positions in the smoothest way, we should keep the pad dimensions of M3 essentially unchanged (6.75mm x 27mm in M3R1), which means negligible differences to the M2, M4 and M5 chamber sizes (<1mm). For M1 the R3/R4 chamber size would be in x=7.9mm less and in y=1.6mm. Concerning the muon filter, an envelope of 82cm seems indicated, given the present ideas on how to build up the walls. We have to be sure that we can make it with a chamber envelope of 36cm ! It leaves about 76mm for each chamber (including tolerances and fixation 79mm).

21/11/2002 Muon MeetingBurkhard Schmidt Request to change envelope at some points for M1

21/11/2002 Muon MeetingBurkhard Schmidt Request to change envelope at some points for M1 The SPD/PS people would like to get additional 5cm in z of M1 at |y|>335cm to avoid complications with the MaPMT and the FE-cards. As it is outside the muon chamber area (sensitive area ends at y=320cm), we have only the support structure there. I have the impression that we can accept this request. Comments ?