EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT ATLAS Roman Pots at IR1 Beniamino Di Girolamo CERN.
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
ATLAS Roman Pots at IR1
Beniamino Di GirolamoCERN
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
ATLAS Roman Pots location
RP
IP
240m 240m
RPRP RP
RP RP RP RP
Roman Pot Station
{{
Roman Pot Unit
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
ATLAS Roman Pot design
Strategy adopted for designo Roman Pot Unit design as TOTEM
• Modifications (as explained later)– Trying to minimize further even
those
o Specialized ATLAS Pots• Same technology as TOTEM• Different shape
– Suited to different detector technology adopted
– Extrusions for overlap detectors Time scale strategy (more in few
slides)o Minimize interferenceso Cope with status of project
(started later)
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
ATLAS specific
Only vertical Pots are adopted Fewer Beam Position Monitors
o One each couple of Roman Pot Units (that is each Station)
Overall support adapted to specific location and beam heighto Different base plate adapted to ATLAS support and
height Detector technology: fiber tracker
o Different space usage in the Poto “fan-out” space for fiber routing
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
TOTEM RP Unit
TOTEM (courtesy M. Oriunno)
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
ATLAS specific modification on RP Unit
Factorize out vertical station
Adapt to correct height
TOTEM (courtesy M. Oriunno)
keep
away
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
ATLAS specific: location and support
Separated BPMo Only between
the 2 RP Units
Best use of the space for the support
Height of beam in IR1 = 1110 mm as opposed to 950 mm for TOTEM
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
ATLAS specific: fiber tracker
Fiber trackero u-v sets with relative staggeringo Concept proved to be workable for preparing the
moduleso Preliminary test beam results look promising
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
ATLAS specific: fiber tracker
Prototypes tested at DESY (test beam 2005)
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
ATLAS specific: overlap detectors
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
ATLAS specific: the Pot as a consequence
We are optimizing this design: very preliminary pictures
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
Other issues under optimization: space for electronics
Allow enough space to extract the bottom pot:Different constraints respect to TOTEM. As a consequence constraints on envelope for electronics
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
Status: interactions
Roman Pot Unit: design by TOTEMo Frequent synchronization with M. Oriunno
to follow the evolutions Interactions with TS
o Postponed at the end of TOTEM needso First contacts with TS
• Part-time availability of TS designer in January ‘06
• 100 % availability from February ‘06
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
Status: pending points
Efficient use of the diameter of the Poto More surface for arranging
photomultipliers• Finalizing lateral dimensions for electronics
Vertical displacement of the potso Imposed envelop on electronicso Interplay between space needed for
electronics and for easy routing of the fibers• Competing requirements: finding the optimal for
both
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
Schedule
December ‘05 - February ‘06o Finalize remaining issues on pot specifications
• ATLAS internal reviews and discussions (next one in few days)
January ‘06 - March-April ‘06o In collaboration with TS
• Implement ATLAS specific changes to RP station• Implement ATLAS pot design with extrusions and
specific fan-out shape• Possible prototype for proof of thin window processing
in presence of extrusions Fall ‘06
o Test beam at CERN: final fiber prototype (all channels, realistic Pot)
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
Schedule
3Q06-1Q07o Production
• If production done by the same supplier as TOTEM one: ATLAS production starting at the end of TOTEM production
Installationo Dependent on:
• Readiness of the mechanics• Readiness of the detector• Availability for installation (ATLAS beginning or
next shutdown)
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
Backup slides
ATLAS
LUMI
15 February 2005 Luminosity and Forward Physics WG meeting - Update on fiber tracker: Layout and tests - A.Braem, C.Joram, A.Folley PH/DT2-ST
Interface flange to MAPMT: leak test
Test piece:
9 fibers glued (with BC-600 optical cement) in cylindrical holes through an aluminium / PMMA flange
• Single point diamond machining of fiber ends after gluing.
Helium test
Vacuum tight up to 2x10-9 mbar l sec-1
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EDR of the TOTEM Roman Pots - CERN - 24 November 2005Beniamino Di Girolamo - CERN PH/ATT
Strategy
Basic plano Short runs of few weeks
• We are confident to keep a good vacuum during that time
In case of longer runs or leakso Access to pumpo Make the vacuum tightness at the
photomultiplier interface level
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