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

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 2 ATLAS Roman Pots location RP IP 240m RP Roman Pot Station { { Roman Pot Unit

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 3 ATLAS Roman Pot design  Strategy adopted for design oRoman Pot Unit design as TOTEM Modifications (as explained later) –Trying to minimize further even those oSpecialized 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) oMinimize interferences oCope with status of project (started later)

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 4 ATLAS specific  Only vertical Pots are adopted  Fewer Beam Position Monitors oOne each couple of Roman Pot Units (that is each Station)  Overall support adapted to specific location and beam height oDifferent base plate adapted to ATLAS support and height  Detector technology: fiber tracker oDifferent space usage in the Pot o“fan-out” space for fiber routing

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 5 TOTEM RP Unit TOTEM (courtesy M. Oriunno)

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 6 ATLAS specific modification on RP Unit Factorize out vertical station Adapt to correct height TOTEM (courtesy M. Oriunno) keep away

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 7 ATLAS specific: location and support  Separated BPM oOnly 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

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 8 ATLAS specific: fiber tracker  Fiber tracker ou-v sets with relative staggering oConcept proved to be workable for preparing the modules oPreliminary test beam results look promising

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 9 ATLAS specific: fiber tracker Prototypes tested at DESY (test beam 2005)

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 10 ATLAS specific: overlap detectors

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 11 ATLAS specific: the Pot as a consequence We are optimizing this design: very preliminary pictures

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 12 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

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 13 Status: interactions  Roman Pot Unit: design by TOTEM oFrequent synchronization with M. Oriunno to follow the evolutions  Interactions with TS oPostponed at the end of TOTEM needs oFirst contacts with TS Part-time availability of TS designer in January ‘ % availability from February ‘06

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 14 Status: pending points  Efficient use of the diameter of the Pot oMore surface for arranging photomultipliers Finalizing lateral dimensions for electronics  Vertical displacement of the pots oImposed envelop on electronics oInterplay between space needed for electronics and for easy routing of the fibers Competing requirements: finding the optimal for both

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 15 Schedule  December ‘05 - February ‘06 oFinalize remaining issues on pot specifications ATLAS internal reviews and discussions (next one in few days)  January ‘06 - March-April ‘06 oIn 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 oTest beam at CERN: final fiber prototype (all channels, realistic Pot)

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 16 Schedule  3Q06-1Q07 oProduction If production done by the same supplier as TOTEM one: ATLAS production starting at the end of TOTEM production  Installation oDependent on: Readiness of the mechanics Readiness of the detector Availability for installation (ATLAS beginning or next shutdown)

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 17 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

EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 19 Strategy  Basic plan oShort runs of few weeks We are confident to keep a good vacuum during that time  In case of longer runs or leaks oAccess to pump oMake the vacuum tightness at the photomultiplier interface level