Manchester 11-13 Dec 20051 Dynamic Alignment of Roman Pots Konstantin Goulianos The Rockefeller University The Future of Forward Physics at the LHC Manchester,

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Presentation transcript:

Manchester Dec Dynamic Alignment of Roman Pots Konstantin Goulianos The Rockefeller University The Future of Forward Physics at the LHC Manchester, UK, Dec 2005

Manchester Dec Run-I,0 ( ) Elastic, single diffractive, and total cross 546 and 1800 GeV Roman Pot Spectrometers Roman Pot Detectors  Scintillation trigger counters  Wire chamber  Double-sided silicon strip detector Results PRD 50 (2004) 5518; 5535; 5550  Total cross section  tot ~ s   Elastic cross section d  /dt ~ exp[2  ’ ln s ]  shrinking forward peak  Single diffraction Breakdown of Regge factorization T rackers in Roman Pots out to |  | = 7 Alignment corrected by using elastic scattering

Manchester Dec CDF-I Run-ICRun-IA,B Forward Detectors BBC 3.2<  <5.9 FCAL 2.4<  <

Manchester Dec CDF-I Roman Pot Spectrometer 3 trigger counters 3x[2X(20+20)]=240 channels Alignment performed by surveying Hosai Nakada – thesis Fiber width: 800 

Manchester Dec CDF Run I results 93(2004)141601

Run-II CDF CDF Forward Detectors MiniPlug calorimeters (3.5<  <5.5) Beam Shower Counters (5.5<  <7.5) Antiproton Roman Pot Spectrometer 2001-

Manchester Dec Run-II Forward Detectors

Manchester Dec MiniPlug Run -II Data ADC counts in MiniPlug towers in a pbar-p event at 1960 GeV. “jet” indicates an energy cluster and may be just a hadron. Approximately 1000 counts = 1 GeV Multiplicity distribution in SD and ND events MiniPlug tower structure

Manchester Dec Diffractive Dijets ND+SD & SD+MB overlap events  ~ 1 SD events Flat region

Manchester Dec Run II Roman Pot Tracking

Manchester Dec Calibration of RP position t=0 t=-0.5 fixed  x pbar z xx Method Adjust  x to get the steepest t distribution

Manchester Dec Roman Pot Distributions edge effect

Manchester Dec Determining  x from data Method: maximize the t=0 value of d  /dt

Manchester Dec x and y Alignment maximize the |b|-slope  obtain x and y offsets

Manchester Dec HERA &Tevatron->LHC p IP