Comments on Polarimeter Programming
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Comments on Polarimeter Programming NEW IN RUN6 PowerPoint PPT Presentation


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Comments on Polarimeter Programming NEW IN RUN6 AGS polarimeter switched to 10 times faster readout with CMC100 USB controller RHIC polarimeters completely decoupled from each other (Blue-Yellow-HJet)

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Comments on Polarimeter Programming NEW IN RUN6

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Comments on polarimeter programming new in run6

Comments on Polarimeter Programming

NEW IN RUN6

  • AGS polarimeter switched to 10 times faster readout with CMC100 USB controller

  • RHIC polarimeters completely decoupled from each other (Blue-Yellow-HJet)

  • New measurement scripts developed by CAD, including target scans and polarization averaging by target movement

  • WFD version 10 debugged and implemented with HJet

  • New HJet off-line software developed allowing fast polarization result on run by run basis


Comments on polarimeter programming new in run6

New in WFD Version 10

  • Data flows and calculation algorithms are significantly changed

  • No direct readout – only storage of events to the onboard memory

  • Raw waveform modes completely removed (now HJET, AT, ALL)

  • HJet waveform mode introduced allowing prehistory recording and programmable waveform length up to 3.5 s

  • New baseline subtraction algorithm introduced:

    • 4 points of each “no signal” waveform are averaged within the window of the bunch period

    • “running average” over 64 “no signal” bunches calculated

    • the baseline of the inverted signal is shifted 8 ADC units from zero to account for the noise and small overshoot

  • Separate waveform and parameters FIFO allow buffering in all modes of operation including ‘ALL’ (waveform+parameters)

  • Lookup tables, histograms and scales are kept the same as in V9 for fast on-line result

To waveform recorder

Level trigger

Baseline subtraction, inversion and shift

ADCs

3pt filter

Baseline calc


Comments on polarimeter programming new in run6

Data Flows in V10

‘HJET’ MODE

Length

Delay

Level trigger

To memory

Digital delay line

Gate

Waveform FIFO

‘AT’ AND ‘ALL’ MODES

WF enable

Gate

‘WF’ FIFO

Delay 2 bunch crossings

To memory

‘AT’ FIFO

TMAX, Amplitude, Integral

Delay 1 bunch

LUT logic

Histograms

Backward scan

Time algorithms

  • Completely different data flows in different modes, yet sharing the same FPGA resources


Comments on polarimeter programming new in run6

Time Determination Algorithms

  • Based on previous test signal off-line calculations 2 best time algorithms were chosen out of 7 studied

  • Programmable CFD threshold ¼ or ½ of the amplitude

CFD 3+3 points

  • 3 points above and below threshold are averaged

  • Line connecting averages crossing the threshold defines the time

Average leading edge

  • Area of the hatched figure is calculated and divided by the amplitude

  • The time is represented by the horizontal side of the equivalent rectangular


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