Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ and Analysis Bob Michaels with Reminder about Nov 2006 Results Specification of new.

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Presentation transcript:

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ and Analysis Bob Michaels with Reminder about Nov 2006 Results Specification of new FADC Data Analysis with FADC Gregg Franklin Alexandre Camsonne Sirish Nanda

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ FADC fanout to counting DAQ detector PMT (Neg. HV) amplifier ~ 20 m ~ 120 m ~ 30 m 1 st floor cnt room 2 nd floor cnt room Compton photons Nov 2006 Compton Integration DAQ FADC Data integrated over helicity pulse (30 msec) FADC samples also available. BCM, Compton laser status, & EPICS data available. Inside Hall A

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Time (ea. bin 5 nsec) Voltage (full scale ~2 V) FADC Samples that look like signal

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Time (ea. bin 5 nsec) Voltage (full scale ~2 V) FADC Samples that look like background ~ 50 nsec

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Integral over the width of individual pulses Its what the counting DAQ does, too. Clear Compton events seen. LED calibrates energy scale. Brehmstrahlung background (1/E)

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ To obtain a digital integral with zero deadtime: use so-called Accumulator = sum of samples subject to cut conditions : Cut conditions are optional Sample above a certain threshold. Sample below another threshold. over 30 msec helicity window ( can be turned off ) ( eliminates noise ) ( eliminates background ) Full-sampling mode used to evaluate systematic errors.

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Setting up Accumulator (Nov 06 data) Problems: 1.The high cut didnt work so we made big pulses clip at zero. 2.We did not know the pedestal of accumulator (understood later). FADC sample (ADC units)

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Asymmtries from Accumulator Day 1 : IHWP outDay 2 : IHWP in and different thresholds ! FLIP laser pol. Laser off.

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Summary of Nov `06 Experience Saw Compton events, good signal-to-background Too much electronic noise Accumulators worked well, but... Need shorter cable runs. Want no amplifiers Get more gain with 12-stage PMT ? Asymmetries made no sense until we realized … Pedestal subtraction wrong and threshold dependent. Need more info. to subtract pedestals.

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Specification of new FADC with fancier accumulators by Bob Michaels and Gregg Franklin Spec has been sent to two vendors: SISGmbH and CAEN. Expect boards from each vendor in ~August. Old SISGmbH boards can be updated (new firmware) Boards have other uses in Hall A.

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Resolution 12 bits Sampling Rate 250 MHz ( or 200) Range Buffer Accumulator Custom FADC based on SIS3320 / CAEN1720. bipolar Samples See next slides ( 33 msec ) CAEN SIS

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Voltage Time Zero Volts Typical Big Pulse (background) Typical Small Pulse (Compton event) Low Threshold High Threshold How Thresholds Work

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Accumulator Feature Samples added between Tstart and Tstop Subject to cut conditions (optional). Number of samples available N Ex #1 Data above a threshold, or data between a low & high threshold. Ex #2 Data N pulses before & after a threshold (more linear response). sample See the spec for details. Necessary for pedestal subtraction

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Voltage ; Conversion ; Pedestal ; ADC value Example : How to Analyze Data FADC measurements Integrated Signal ( C cancels in Asy. ) Deadtime Correction ( high threshold ``robs signal ) Physical Signal to use in Asymmetry. B = background empirical correction missing in Nov 06 thanks, Gregg !

Bob MichaelsParity Collab. Mtg. May 17, `07 Integrating Compton DAQ Conclusions – Integrating Compton DAQ ``Data Analysis on a Chip looks promising, may have widespread applications FADC with new accumulators ready this summer. ~ August but yet to be proven.