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