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Documentation

DAQ

• VME Crate Diagram
• VME Crate Modules
  • FlexIO Board
  • Scaler Module V560 (pdf)
  • CAEN QDC V792 (pdf)
• Connection Diagram
• Signal Connections

FADC Documentation

• Hardware Architecture (pdf presentation)
• Firmware Architecture part1 (pdf)
• Firmware Architecture part2 (pdf)
• Data Format (pdf)

CODA Startup

Start CODA Date: 02 December, 2010 File: start_coda.html

FADC CODA is running on 'hamoller' computer under 'moller' account. To start CODA one can type command: 'start_coda_brad' - that fires up the usual set of windows for ET, ER, EB, etc. For FADC DAQ 'fadc_moller' configuration is used.

FADC parameters. There is configuration file with settable parameters for FADC. File is located in directory: ~moller/crl/FADC/fadc_params.cnf Parameters from file are loaded to FADC in 'Prestart' state of CODA. There is self explained list of FADC parameters from configuration file:

1. Wed Apr 21 16:22:20 EDT 2010
2. FADC settable parameters

1. Threshold on calorimeter sums (define triggers and SW scaler logic)

FA_SUM_THRESH_CR 8500 FA_SUM_THRESH_CL 8500

1. Threshold on individual channels
2. Define SW scaler logic for Scintillators only
3. Controls digitized data output for all channels (ie. 'zero-suppression')

FA_CHN_THRESH_SR 500 FA_CHN_THRESH_SL 500 FA_CHN_THRESH_CR 500 FA_CHN_THRESH_CL 500

1. 1. Prescale range: 1--2047

FADC_PRESCALE_CL 1000 FADC_PRESCALE_CR 1000 FADC_PRESCALE_CRL 200

1. 1. These many DATA trigger are grouped into each DATA interrupt

FADC_EVENTS_PER_BLOCK 20

1. 1. PULSE_WIDTH range is from 3--255 (3 is default)

FADC_PULSE_WIDTH 3

1. 1. COIN_WIDTH range is from 1--255 (2 is default)

FADC_COIN_WINDOW 2

1. 1. Delays range: 1--255

FADC_DELAY_CL 0 FADC_DELAY_CR 0 FADC_DELAY_SL_0 1 FADC_DELAY_SL_1 1 FADC_DELAY_SL_2 1 FADC_DELAY_SL_3 1 FADC_DELAY_SR_0 1 FADC_DELAY_SR_1 1 FADC_DELAY_SR_2 1 FADC_DELAY_SR_3 1

1. 1. This delay is for the _delay counts (random background measure)

FADC_DELAY_SRL 25

Data stored on 'hamoller' computer to directory: /data1/raw/

Analysis

• Data Trigger Analysis

Useful tips

• Signal photos: MPS(blue) vs Helicity(yellow) signal, zoomed , as on Oct 07 2012

Known Issues and Firmware upgrade

• Known FADC issues*

Literature

• FADC for Hall A Moller (March 18, 2009)
• Moller FADC DAQ Upgrade