DIRC R&D Software User's Guide

Starting a PMT scan

ssh to kskpi and go to the data storage disk

ssh kskpi
cd /u2/data

Set the $CRT variable to the correct local version

setenv CRT "/u2/DAQ/CosmicRayTelescope"

Check if a run is currently going on:

ps -elafww | grep testmain

If that command does not find a running testmain, you can start a new run. Assuming that the CRT code is well-maintained on /u2/data you can use that version of the code. Otherwise you cd to your own CRT directory.

Define the scan parameters: start/end points in x and y, number of triggers per point, step size in x/y. You do that by editing making_todo.cpp. When you're happy with that file, create the run input file

g++ making_todo.cpp
./a.out

This command created a file called todo_copy. Check if the contents are OK. If so simply copy the todo_copy file

cp todo_copy todo

Now check if the PERL script that starts runs is running

ps -elafww | grep pl

If that command does find a running run.pl you're done. If not, start a new script

perl run_new.pl >&! opfile < /dev/null &

and you're done.

To avoid problems with power-outages it is a good idea to move the setup to the (0,0) location after the scan is done. When the controller is switched on after a power-outage it often "thinks" that it is located at (0,0) even though it still sits on the DIRC calibration PMT.

$CRT/ScanTests/special_cases/set_to_position.pl 0. 0.

Anytime you want to check a pad between scans, you can move the laser to a pad with the command (pad 24 in this example):

$CRT/ScanTests/special_cases/set_to_pad.pl 24

After a Power Outage

It a power outage occurs during a scan the motion controller may no longer know where the xy stage is located (remember that the actuators do not send a position feedback to the controller). The only way to fix that problem is by establishing the coordinate system again. That is done by moving all actuators to their physical limits and resetting the coordinates.

root -q -b -l $CRT/ScanTests/special_cases/execute_after_power_outage.C

Last significant update: Mar 31, 2008, by Joe