ATLAS Roman Pots status, commissioning and operation

1. ATLAS Roman Potsstatus, 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

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

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

4. LHC beam Scintillating Fibre Tracker • Concept • 2 x 10 U planes • 2 x 10 V planes • 64 scintillating fibers • 0.5 mm2 square planes are horizontally staggered by multiples of 70.7 mm. Ceramic Substrate ~ 3 x 3 cm2 Positioning plate Fiber Connector Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

5. 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 0.5mm2 single cladded Trig. S3 Si4 Trig. Si2 Si1 S1 x S2 • Beam • 6 GeV electrons • Beam spot ~ 1 cm2 • Setup • Si telescope (~30 mm resolution) • MAPMT – CAEN QDCs – PC 2x10x6 Detector Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

6. DESY Testbeam published results ALFA + Si-Tel. Si-Tel. Light yield: 4.5 p.e. Efficiency ~ 95% # Events Signal (ADC counts) Residual (mm) ALFA Resolution: sx,y ~ 36 mm Potentially increased by multiple scattering of the relatively low energy electrons Non-Active Edge Region << 100mm # Events ALFA (2x2x32) S330 Y (mm) Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

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

8. CERN Testbeam - October 2006 PMFs Mother Board 2x2x64 + Final Trig. Overlap Detectors • Detectors • Two ALFA trackers (larger wrt DESY TB) • Overlap Detectors • Beam • 230 GeV protons (p+/-) 2x10x16 • 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

9. CERN Testbeam very preliminary results ALFA Event (Reconstructed using 2 x half of ALFA) ALFA Active Area “Online” Results ! Offline analysis on going Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

10. Final ATLAS RP Unit • Derived from TOTEM design • Changes • No horizontal pot • Different mounting of Pot on flanges • 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

11. Mechanics status • Received pre-series Roman Pot Unit at CERN • Being assembled and soon tested by PH/DT1 team • 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 • Need of commissioning the movement precision • Verification of possible deformations under vacuum • Assessment of the achievable precision and reproducibility • Foreseen use in 2007 testbeam setup • We will start the final procurement after pre-series sign-off • 4 Roman Pot Units • Order: February-March 2007 Joint LHC Machine-Experiments Workshop on Very Forward Detectors - 25 January 2007 Beniamino Di Girolamo - CERN PH

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

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

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

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

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

17. 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

18. Scheduling • Roman Pot Units • 4 Units to be procured • After sign off on pre-series • Procurement of motors, screws, rails and misc. • Started • 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) • Pot • First prototype being prepared • Will be tested under vacuum • One or two will be used for the future test beam • Simulation of RF compatibility ongoing and tests to be done • 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

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

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

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