Summary 2/25/22

PARTICIPANTS: Brad Sawatzky, Carlos Munoz-Camacho, Carlos Yero, David Hamilton, Hamlet Mkrtchyan, Vladimir Berdnikov, Tanja Horn, Steve Wood, Paul King, Julie Roche, Rachel Montgomery

ANALYZER DISCUSSION

• A simple Analyzer exists - getting fADC scaler data out shoul be straightforward for initial checkout

• Decoding and getting Analyzer set up requires more work:

• Brad can take care of the Analyzer setup and data written to disk
• Software lead neded for the rest

• Analyzer support for VTP payload

• payload modifications should be straightforward
• fADC --> VTP --> summing and triggers decisions
• Task of the Fast Electronics Group - status: "done"
• needs to get this going in the test setup

• Event unblocking feature

• lots of ideas, but not yet concrete
• needs to be done by Hall C - B. Michaels had initially offered help - Brad will check in with him
• SBS is not using event blocking
• not needed when starting the NPS assembly

• The team

• Coordination: Brad Sawatzky
• Software lead: David Hamilton
• Contributors: Steve Wood, Paul King, ...

DAQ/ELECTRONICS TESTS IN SUMMER 2022

• DAQ will be running and HV will be available

• stack crystals - a few options

• stack 1-2 rows, hook up, and check functionality on scope (diagui)
• stack everything (as was done for DVCS/Hall A) since usually the electronics are bad not the crystal

• Trigger tests

• preload data into fADC to test how VTP is doing
• use LEDs to simulate clusters and check if VTP is doing what it should be doing
• cosmics to sanity check VTP

• For cluster trigger tests a board will be provided by FEG

• NPS readout: ~75% of full readout will be available (256 channels == 1 crate remains in HMS and is not available)

• this only impacts signals
• can still test all channels - just need to move cables from block to block

NPS DETECTOR CHECKOUT

• Discussion of the list prepared by Julie

• DAQ requirements for these tests is low

• one question is the stacking strategy: stack everything and plut into DAQ vs. checking individually with scope
• in DVCS/Hall A everything was stacked - smaller calorimeter, but should be ok for NPS too

• Check gain variation with cosmics

• better with LED as it is faster
• can also check how LY varies with temperature as sanity check

• Time estimate: a few months of debugging assuming all tools are available

• Consider developing remote control features and displays

• for HV remote control need to make sure TOSP in place and hard interlock for the box

OVERVIEW DIAGNOSTIC TOOLS AND HISTOGRAMS FROM COMCAL

• Note: ComCAL has 12 x 12 channels

• Diagnostic controls:

• turn on/off LED, change frequency, change amplitude
• HV GUI: turn on/off channels one-by-one

• Histograms:

• (ONLINE) rate vs. fADC channel (block)
• (ONLINE) fADC count vs. paddle
• (OFFLINE) cosmic event in matrix
• (ONLINE) 2D heat map (density/occupancy plot) for scalers row vs. column
• (ONLINE) EPICS to archive to monitor temperature
• (ONLINE) HV adjustment - response from PMT, fit and plot

• Note that scalers from fADC can run without decoding - other items will depend on decoding

• Detector debugging - how to separate PMT from amplifier malfunction

• in general, the approach (if a dead channel is observed) is the same - access to PMT and board and swap entire assembly

• Cooling strategy on Day 0 and in the hall

• need to watch for condensation - should not get into box
• in ComCal assembly the AC failed for a period of time and resulted in humid conditions
• if there is condensation one strategy could be absorbers, but these might saturate quickly
• in the hall humidity will be controlled

• Action items:

• develop histograms and scaler/scaler displays (David H. and team)

DATA TAKING DURING EXPERIMENTS

• waveform data from 5x5 grouping set around VTP determined cluster --> see page 4 in Brad's talk from 2022 Collaboration Meeting

• HMS trigger is generated in NIM (as is done)

• NPS trigger: VTP generates trigger based on internal logic and sends out NIM signal that will be combined with HMS (as in any third arm)

• HMS also event blocked

• ET
• scaler events

NEXT MEETING: THURSDAY MARCH 10 AT 9AM ET AND EVERY TWO WEEKS AFTERWARDS