Compton DAQ Dev

Project to Develop a DAQ for the Compton

Here are some notes on the project of developing the Compton counting mode DAQ. The original work was done mainly by Bryan Moffit and Ben Raydo in 2020, with input from others.

It is foreseen to be a precurser of a moller polarimeter DAQ as well as a counting-mode DAQ for the MOLLER project, etc.

See earlier work https://hallaweb.jlab.org/wiki/index.php/Compton_Counting_DAQ_Software_HOWTO

Basic Setup

updated R. Michaels Oct 12, 2022

Here is a picture https://hallaweb.jlab.org/wiki/index.php/File:Polarimeter_daq_xfig.pdf

The basic configuration of the DAQ

DAQ config: https://hallaweb.jlab.org/wiki/index.php/File:HaVTP_config.png

ROC1 : https://hallaweb.jlab.org/wiki/index.php/File:Roc1_config.png

VTP : https://hallaweb.jlab.org/wiki/index.php/File:VtpROC_config.png

How to Run

updated Oct 12, 2022.  R. Michaels

How to login to the two ROCs and start the ROC

ssh -X amoll1 -l sbs-onl
./startroc1

ssh -X havtp1 -l sbs-onl
./startRoc

How to start CODA on atedf3.  Username adaq.

kcoda

startcoda

VTP readout
havtp1:/home/sbs-onl/comptonDaq/vtp/rol/vtp_list.so
ROC1 readout
amoll1:/home/sbs-onl/comptonDaq/rol/vtpCompton_list.so

Oct 12, 2022.
Currently using a 50 Hz front-panel pulser trigger on TI.
Later want to modify this to use a trigger from VTP based on data
from FADC and/or the VETROC.

If I drop the VTP from the readout and remove tiRocEnable(2)
from amoll1:/home/sbs-onl/comptonDaq/rol/vtpCompton_list.c
then the DAQ runs fine and both the FADC and VETROC data
make sense.

Next I added the VTP.  Still a FP trigger.  It downloads
and prestarts. But here is where the problems start. 

Current Problems

Oct 12, 2022.  R. Michaels

Problematic symptoms:

I don't get any events.  Actually I get a burst of events on ROC1
but the VTP seems to be stuck.

VTP complains a lot:  VTP_output.txt

Some notable errors
vtpInit: VTP_FW_Version=0x10004, VTP_FW_Type=19
vtpInit: ERROR - unknown firmware type 19. Unable to setup VTP PLL.
vtpSerdesCheckLinks: ERROR - all serdes links not up!
daLogMsg: ERROR: VTP Serdes links not up
(I set it up to temporarily ignore that and try to get events)
vtpSetCompton_EnableScalerReadout: ERROR: VTP wrong firmware type (15
when the run ends, the VTP segfaults
./startRoc: line 4:  1755 Segmentation fault      coda_roc -i -s $SESSION -n vtpROC -t ROC

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Detailed printout from VTP https://hallaweb.jlab.org/wiki/index.php/File:VTP_output.txt