ATLAS Roman Pots status commissioning and operation Beniamino

ATLAS Roman Pots status, commissioning and operation Beniamino Di Girolamo on behalf of the ATLAS Luminosity WG CERN Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

ATLAS Roman Pots locations LHC SPS ATLAS CERN RP RP 240 m RP RP IP RP RP 240 m Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Roman Pot ATLAS Roman Pot Unit Front-End Elec. 24 MAPMTs Shielding Vacuum Flange Fiber Connectors 20 x 64 Fibers (Tracker) LHC Beam Overlap Fiber Detector Roman Pot Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Scintillating Fibre Tracker Concept • 2 x 10 U planes • 2 x 10 V planes are horizontally staggered by multiples of 70. 7 mm. • 64 scintillating fibers • 0. 5 mm 2 square Ceramic Substrate ~ 3 x 3 cm 2 LH C be a m Positioning plate Fiber Connector Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

DESY Testbeam - November 2005 Detectors A set of different detectors was built to test: Light yield, Efficiency, Cross talk, Edge sensitivity, Resolution etc. Base line fiber: (SCSF-78, S-type) Kuraray 0. 5 mm 2 single cladded Trig. S 3 Trig. Si 4 Si 2 Si 1 S 1 x S 2 Beam • 6 Ge. V electrons • Beam spot ~ 1 cm 2 Setup • Si telescope (~30 mm resolution) • MAPMT – CAEN QDCs – PC 2 x 10 x 6 Detector Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

DESY Testbeam published results # Events ALFA + Si-Tel. Light yield: 4. 5 p. e. Efficiency ~ 95% Signal (ADC counts) # Events Residual (mm) S 330 ALFA (2 x 2 x 32) Y (mm) Non-Active Edge Region << 100 mm ALFA Resolution: sx, y ~ 36 mm Potentially increased by multiple scattering of the relatively low energy electrons Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Final front-end electronics R/O FPGA MAROC R/O chip 40 mm (64 x Amp. + Disc. ) Adaptor Board MAPMT HV Board Mother Board 30 mm Read-Out Read Out System Trigger (PMFs + MAPMTs) PMF (PM Front-End) Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH Trigger

CERN Testbeam - October 2006 PMFs 2 x 2 x 64 + Final Trig. Mother Board Overlap Detectors • Two ALFA trackers (larger wrt DESY TB) • Overlap Detectors Beam • 230 Ge. V protons (p+/-) 2 x 10 x 16 Setup • 5 x MAPMT – 5 x PMF - Motherboard – PC Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

CERN Testbeam very preliminary results ALFA Event (Reconstructed using 2 x half of ALFA) ALFA Active Area ! s t l su e R e” n ing i l o n g “O on s i s ly a n ea n i l Off Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Final ATLAS RP Unit q Derived from TOTEM design q Changes o No horizontal pot o Different mounting of Pot on flanges o Modified base and fixes to respect beam height and to allow easier extraction of bottom Pot Designer: J-M Lacroix (TS) Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Mechanics status q Received pre-series Roman Pot Unit at CERN o Being assembled and soon tested by PH/DT 1 team o Will be a fully operational Roman Pot Unit • Will be also used to setup the control system and to organize the cable routing and patch panels o Need of commissioning the movement precision • Verification of possible deformations under vacuum • Assessment of the achievable precision and reproducibility o Foreseen use in 2007 testbeam setup q We will start the final procurement after pre-series sign-off o 4 Roman Pot Units o Order: February-March 2007 Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Positioning: today and tomorrow Today “Tomorrow” Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

The two RP Units on one side Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Final Pot Pumping hole Top flange Rectangular body out of center Brazing under test S. Mathot (TS-MME) Overlap extrusions brazed on bottom Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Final Pot: extrusions for Overlap detectors Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Top view of the detector in the pot Fiber detector Trigger scintillator (detector) Overlap detector Trigger scintillator (overlaps) Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Scheduling q Roman Pot Units o 4 Units to be procured • After sign off on pre-series o Procurement of motors, screws, rails and misc. • Started o Currently foreseen delivery: Spring-Summer 2007 • Installation in May 2007 seems difficult, not yet impossible – We would only install the mechanics with either pots or covers in the main vacuum chamber. No movements, all blocked in safe position. • Otherwise waiting for next shutdown (2007/08) q Pot o First prototype being prepared • Will be tested under vacuum • One or two will be used for the future test beam o Simulation of RF compatibility ongoing and tests to be done o Final production in sync with Roman Pot Units production • All material procured Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Scheduling q Cables in place, ancillary elements being procured o Patch panels being prepared o Movable vacuum equipment to be procured q Detector and electronics o Concepts proved to be suitable for our application • We are improving various details and we plan a testbeam in 2007 o Aiming for installation by shutdown 2008/09 Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Commissioning (shutdown 2008/09) q Commissioning during shutdown o Movements and controls o Access procedures o Safety procedures o Vacuum system o Interlocks o Simulation of normal and alarm conditions Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

Operations (2009 run) q If luminosity would allow with nominal optics o In park position • Detector commissioning with halo particles • Background studies q With high optics o Approach to the beam o Detector commissioning (1 st time) o Test on overlap detectors o Normal running Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH