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A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop. AGS CNI polarimeter. Current Status.
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A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop AGS CNI polarimeter. Current Status. Elastic scattering of polarized beam protons on a extremely thin carbon target with a small (~0.01(GeV/c)2)momentum transfer. Large cross-section and a few percent analyzing power. Igor Alekseev (ITEP) BNL-2002
A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop AGS setup RSC Meeting 24mm Silicon strip detectors 25cm 10mm p A carbon ribbon target: 300-600 m x 5 g/cm2 PC 12 ns SHAPER WFD Si STRIP PREAMP Transformer In AGS tunnel In the HITL2 house Igor Alekseev (ITEP) BNL-2002
A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop ADC ADC 2.4 ns delay ADC 4.7 ns delay WFD Block Diagram RSC Meeting CH1 BUFF Virtex FPGA Virtex FPGA Virtex FPGA CAMAC Databus DRAM CNTR Control CPLD CH2 DRAM 16 MB CH3 CH4 140 MHz 420 MS/s/ch = 2.4 ns/S Igor Alekseev (ITEP) BNL-2002
A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop FPGA Block Diagram RSC Meeting MUX ADC Virtex FPGA Waveform FIFO / Delay Mean Subtraction 140 MHz 1/4 Amplitude Mean Calculation Time (CFD) Integral ControlLogic Result FIFO LevelTrigger CAMAC readout x2 70 MHz Int/Ampl LUT Time/Ampl LUT Bunch #and Pattern Bunch 0 AND GCC SYNC and Window Logic +1 Scalers and histograms: Bunch # Distr Energy P0 Distr Special Scalers: P+,P–,P0, BG always accessible INH Energy P+ Distr Energy P– Distr Igor Alekseev (ITEP) BNL-2002
A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop WFD features (V8) RSC Meeting • 8-bit amplitude and integral • 1.2 ns time resolution • Bunch # information • Windowed sensitivity with 2.4 ns precision • Digital filter • Time/amplitude and integral/amplitude LUTs • LUTs programmable trough CAMAC • Bunch pattern memory • 5 always accessible scalers (P+,P–,P0, 2*BG) • 120 ch bunch distribution • 3*128ch amplitude distributions for P+,P–,P0 • 32*32 or 16*64 amplitude versus time histogram • Crate or front panelINHIBIT stops event recognition • 16 MB of onboard SDRAM ~ 2.5·106 events • Special input for Gauss Clock Counts • Zero deadtime • Flexible FPGA configuration Igor Alekseev (ITEP) BNL-2002
A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop Expected performance RSC Meeting • Ramp measurement: 2.4 – 24.5 GeV/c a challenge for timing. • Event rate compare to RHIC: • CAMAC readout ~ 106 events / 3s ~ one spill. • 5·108 events per ramp measurement ~ 500 spills · 106 events ~ 40 min. • Radiation damage to silicon. The whole RHIC statistics ~ 20 ramp measurements: one day ! • Event rate per strip ~ 0.1 event per bunch crossing. Igor Alekseev (ITEP) BNL-2002
A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop A RIKEN BNL Research Center Workshop Current status RSC Meeting DONE: • Silicon detectors, preamplifiers and BIAS power supplies are installed in the ring and tested. • Insulation transformers and shaping preamplifiers are installed in HITL2 and tested. • A new 2.5 GHz PC, CAMAC and 6 WFD modules installed in HITL2 and tested. • LeCroy 2367 universal module programmed to produce all necessary spill timing signals and prescale GCC. TO BE DONE: • Get proper signals from AGS. • Get, install and test frequency multiplier. • Write DAQ and analysis software. Igor Alekseev (ITEP) BNL-2002
