ATLAS Roman Pots at IR 1 Beniamino Di

ATLAS Roman Pots at IR 1 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 RP 240 m IP RP { { RP Roman Pot Unit EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT Roman Pot Station

ATLAS Roman Pot design q Strategy adopted for design o 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 q Time scale strategy (more in few slides) o Minimize interferences o Cope with status of project (started later) EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 3

ATLAS specific q Only vertical Pots are adopted q Fewer Beam Position Monitors o One each couple of Roman Pot Units (that is each Station) q Overall support adapted to specific location and beam height o Different base plate adapted to ATLAS support and height q Detector technology: fiber tracker o Different 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 4

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

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

ATLAS specific: location and support 7 q Separated BPM o Only between the 2 RP Units q Best use of the space for the support q Height of beam in IR 1 = 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

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

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 9

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

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 11

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 12

Status: interactions q Roman Pot Unit: design by TOTEM o Frequent synchronization with M. Oriunno to follow the evolutions q Interactions with TS o Postponed at the end of TOTEM needs o First contacts with TS • Part-time availability of TS designer in January ‘ 06 • 100 % availability from February ‘ 06 EDR of the TOTEM Roman Pots - CERN - 24 November 2005 Beniamino Di Girolamo - CERN PH/ATT 13

Status: pending points q Efficient use of the diameter of the Pot o More surface for arranging photomultipliers • Finalizing lateral dimensions for electronics q Vertical displacement of the pots o Imposed envelop on electronics o Interplay 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 14

Schedule q December ‘ 05 - February ‘ 06 o Finalize remaining issues on pot specifications • ATLAS internal reviews and discussions (next one in few days) q January ‘ 06 - March-April ‘ 06 o In collaboration with TS • Implement ATLAS specific changes to RP station • Implement ATLAS pot design with extrusions and specific fanout shape • Possible prototype for proof of thin window processing in presence of extrusions q Fall ‘ 06 o Test 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 15

Schedule q 3 Q 06 -1 Q 07 o Production • If production done by the same supplier as TOTEM one: ATLAS production starting at the end of TOTEM production q Installation o Dependent 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 16

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

ATLAS LUMI 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 2 x 10 -9 mbar l sec-1 15 February 2005 Luminosity and Forward Physics WG meeting - Update on fiber tracker: Layout and tests - A. Braem, C. Joram, A. Folley PH/DT 2 -ST

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