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Published byJoshua Brooks Modified over 8 years ago
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Peter-Bernd Otte - 8 th March 2010 CB collaboration meeting, Mainz
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today@DPG 1. New Moeller electronics 2. Status of new trigger2. cellular cluster counter (see Edinburgh talk)
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What for? ◦ Measure: beam polarity ◦ Constituents: tagger, Moeller radiator, electronics ◦ essential information for many experiments Why built it new from scratch? ◦ faster
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Used parts: ◦ Splitter ◦ Trigger ◦ TDC (8x) ◦ Readout of data Realised on one FPGA (VUPROM) card ◦ One VME CPU to read histograms after measurement Time to save an event: 20ns Lifetime @ 2nA ◦ 99,999% (with gate) ◦ 99% (without Gate)
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output input clock logic cell („modules“): programmable switches Interconnection (“cables”): “has” 1000’s of “modules” and “cables” ~300 I/O signals configuration via software behaviour of cells and interconnection Not a CPU! Can act as: logic, scaler, TDC, …
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New electronic cards arrived (10 cards) „VUPROM 2“ from GSI ◦ FPGA: „Virtex 4“ from Xilinx ◦ 224 inputs, 32 outputs, LVDS ◦ VMEbus connectivity ◦ cheap: 2k€ apiece
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TDC programed in FPGA: ◦ RMS=30ps Make use of propagation time trough smallest entities inside FPGA start end How are these TDCs read out?
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“Measure”-FSM 1.Wait for 1 st hit 2.Wait for 2 nd hit 3.Compute time differences and save temporally 2 Finite state machines (FSM): (“Acqu Root on FPGA”) “Store”-FSM 1.Read RAM 2.Increase Value by 1 3.Write RAM Each step needs 20ns FSMs run in parallel Add more channels without loosing lifetime One FSM per TDC and per histogram
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Detailed view of FPGA 1.8k cells used (9%) in out
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OldNew readout time20 µs20ns lifetime~50%> 95% size1 VME module
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measured yesterday: beam current: 5nA, 30min count asymmetry: ◦ P foil not clear yet N+ N-
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improve calibration ◦ eliminate ripples arising from binning connect more channels ◦ Better statistics (@ constant lifetime!)
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Possible triggers Status of hardware
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Planned so far: ◦ Improved cluster counter (cellular automata logic) ◦ Coplanarity ◦ in conjunction with PID: differentiate charged/uncharged particles for above triggers ◦ Single Tagger signals for detector tests Include (all) detectors...
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Possible to include all detectors ◦ All CB crystals (672x 720 cable pairs) ◦ All PID stripes (24x) ◦ Tagger channels (352x) ◦ Endpoint Tagger (~64x) ◦ TOF-Panels ◦ Inner TAPS crystals (72x) ◦ TAPS crystals and vetos (384x)
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TAPS electronics has output of all CFD Trigger modules are available
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Moeller electronics working ◦ New technique, 10 6 faster Trigger ◦ Enough inputs: feasible to include signals from all detectors ◦ Coming weeks: Installation of new trigger electronics in parallel to existing ◦ Help to include TAPS needed
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Thank you for your attention
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