Reaction Plane Detector Safety Review Abigail Bickley, for the RxnP Group University of Colorado June 22, 2006.

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Presentation transcript:

Reaction Plane Detector Safety Review Abigail Bickley, for the RxnP Group University of Colorado June 22, 2006

Reaction Plane Detector Review2 Physics Overview Detector will be used to measure particle yield distributions versus reaction plane that are currently inaccessible with sufficient statistical resolution –J/Psi –Single electrons from heavy quark decay –Neutral pions at high pT –direct photons at intermediate pT –Jet shape modification RxnP has an improved reaction plane resolution of a x2 above the current BBC capabilities Corresponds to an effective statistical improvement of x3 Covers rapidity region 1.0<y<2.8 2 divisions in  allows study of jet auto-correlation effects BBC RP resolution RxNP resolution 0% 25% 50% 75% 100% 200GeV Au+Au simulation

June 22, 2006Reaction Plane Detector Review3 Detector Design Detector divided into quadrants Each quadrant contains: –3 inner & 3 outer scintillators Fibers embedded at 0.5cm intervals Fibers exit quadrant tray at outer radius –1 painted Pb converter –6 mesh dynode pmt’s –1 LED fiber run to each pmt for calibrations

June 22, 2006Reaction Plane Detector Review4 Scintillator Scintillator: –2in thick BC-412 –Inner scintillator R = 6.5  18.0cm –Outer scintillator R = 18.0  33.0cm –Light tight wrapping: Al mylar Black plastic Epoxy

June 22, 2006Reaction Plane Detector Review5 Prism & Fibers Prism: –Material –Dimensions 3inch diameter cylinder cut at 45 degrees from the PMT window height is ~5cm. Fibers –BCF91A –Cladding –Shrink Tube Prism-Fiber Joint Epoxy Optical Grease will be used to attach the prism to the pmt

June 22, 2006Reaction Plane Detector Review6 Converter 2 in thick Pb-Sb composite –98%Pb, 2%Sb Will be painted to prevent oxidation –SP coat SPSY-3 heat resistant paint –Paint will be applied in Japan before shipping to BNL –Composition already reviewed by CAD Designed to be removable

June 22, 2006Reaction Plane Detector Review7 PMT’s Will use a fine mesh pmt which is capable of operating in the magnetic field environment of the PHENIX central region –Hamamatsu - R5543 assembly (same as R5542 with UV window) –HV cable - (AWG24?) –Signal cable - RG174/U –Base diagram

June 22, 2006Reaction Plane Detector Review8 Electronics Overview New components –Patch panel resistor board –lemo cable (93  ) Scintillator PMT (50  ) Patch Panel & Resistor Board EmCal FEMController BoardDCM BCF91A fiber RG62 (93  ) 10m BNC lemo (93  ) backplaneFiber optic Designed by Steve Boose HV (BBC rack) RG59 PHENIX standard components –BBC HV rack –RG59 & RG62 –EmCal FEM –Controller Board –DCM

June 22, 2006Reaction Plane Detector Review9 Patch Panel & Resistor Board The designed discharge time of the FEM is too long to achieve a DAQ rate > 1kHz To compensate for this we will connect a termination resistor to the input end of the FEM to modify the timing constant Studies suggest a 40k  resistor is sufficient Board will be designed as a patch panel with termination resistor by Steve Boose Need board design/layout

June 22, 2006Reaction Plane Detector Review10 Low Voltage?? Wei this is on your tracking list…. Could you provide some details please?

June 22, 2006Reaction Plane Detector Review11 LED Calibration System (still under design) Pulse Generator PMTLED Box Pulser BoardDiscriminator Fiber optic lemo