Overview of detector requirements Purpose: To put today’s session into context. Steve Watts and Krzysztof Piotrzkowski

WHAT IS THE PHYSICS WE WANT TO DO ???????????? Plenty of diffractive events (SD and DPE) Physics programme in QCD and photoproduction. Two exciting new physics production processes Central Exclusive Production (CEP) Khoze, Martin and Ryskin. and using the LHC as a photon-photon collider – photon-photon physics Quantum number selection rule. High precision mass measurement independent of decay channel See few events => J PC = 0 ++ Production very large. Well known cross sections for SM and BSM processes: SUSY production and anomalous couplings cf. High energy photon collisions at the LHC – CERN April 2008 CDF arXiv

9.30 am : FORWARD DETECTORS AT LHC Chair: Andrew Brandt 9.30: Overview of detector requirements - Krzysztof Piotrzkowski, Steve Watts (25+5) 10.00: Machine Interface (Hamburg pipe and Connection Cryostat) - Detlef Swoboda (25+5) 10.30: Fast timing (GASTOF Update) - Krzysztof Piotrzkowski (25+5) am : Coffee Chair: Krzysztof Piotrzkowski 11.30: AFP Timing Electronics - Jim Pinfold (15+5) 11.50: Reference Timing - Jeff Gronberg (15+5) 12.10: Reference Timing and Fermilab test beam - Mike Albrow (15+5) 12.30: 3D sensor development - Cinzia Da Via (25+5) 1.00 pm : Lunch Chair: Jim Pinfold 2.00: Laser testing and MCP lifetime plans - Andrew Brandt (25+5) 2.30: Fiber detector studies - Weilin Yu (25+5) 3.00: AFP tracker plans - Steve Watts (10+5) 3.15: AFP Tracker Mechanics - Ray Thompson (15+5) 3.35: Forward detector alignment - Peter Bussey (25+5) 4.00 pm : Afternoon Tea 4.30 pm: 3D sensor plans for HPS – Marta Ruspa 4.50 pm: Round Table - Future Plans - All (55+5) 7.30 pm Dinner

History 2000 Technical Proposal Due end 2010 CMS – High Precision Spectrometers (HPS) At 240 and 420 m

AFP and ATLAS Two stations at 220 and 420m to detect leading protons, integrated into the LHC High precision mass spectrometer using the LHC 70 – 1400 GeV/c m 28 7x8 mm 2 sensors per tracking station 4 stations required. or 14 FE-I4 sensors 220m 14 FE-I4 sensors or 60 FE-I3 sensors

DETECTOR REQUIREMENTS Must get as close as you dare to the beam or acceptance lost. Edgeless detectors ( Cinzia Da Via and Marta Ruspa) + Hamburg Pipe Design compatible with collimator design. Liaison with machine division is vital. ( Detlef Swoboda) Tracking precision. One micro-radian or 10 micron with 10 m telescope (Ray Thompson). Sensor + Readout chip must withstand very high radiation levels. 420 region is at 1.8 K. New Connection Cryostat. Pile up. Timing detectors with 10 ps or better precision. High rates and lifetime issues for MCP/PMT tube design, (Krzysztof Piotrzkowski, Andrew Brandt) New Reference Timing System ( Mike Albrow, Jeff Gronberg) Very important to trigger on protons at 220 ( or 420 if you can). Higgs to bb channel. ( Jim Pinfold, Weilin Yu ) Systems must be compatible with operation in LHC tunnel. Radiation levels and overall need for safe and reliable operation Calibration and alignment of a precision spectrometer – how ? ( Peter Bussey)

More recent acceptance studies (P. Bussey)…. Acceptance for , and Numbers mean total distances. 420 at 6 mm everywhere (can do much better than this !) 220 varying from 2mm to 7mm.

HPS acceptance with newest LHC optics    m 12/2009K. Piotrzkowski8 Note: 2mm approach introduce some shadowing of HPS420 N. Schul & J. de Favereau Using two-photon spectra!

Radiation levels - summary 6/12/2008Forward Physics at the LHC10 LocationDistance from IP [m] Dose [Gy] h > 20 MeV [cm -2 ] 1Mev Eq. [cm -2 ] Q622013x10 8 2x10 9 RR13,17,53, x10 8 1x10 9 Q x x10 12 FP420 space x x10 13 MB11A440124x x10 11 MB11B450103x x10 11 Annual levels for nominal LHC T. Wijnands, TS Department Relevant to the support electronic systems in the tunnel and cooling system

NOW ON WITH THE SHOW