A RIKEN BNL Research Center Workshop
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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

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

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

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

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

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

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

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


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