4 Hodoscope modules supported by hardware.

Suggestion:

• 0: Fiber
• 1: Diamond
• 2: Veto X
• 3: Veto Y

Operating the Fiber Start (Pion Hodoscope)

If anything strange is happening, dont hesitate to call/wake me up.
Office in Giessen: 0641-99-33279
Mobile phone: 0177-4769680

Manual for the Start Expert

Do this all the time

Watch Go4. Compare the pictures to reference pictures.

Go4 Panel is still to be changed.

Do this once per shift

nothing yet

Checklist if something is strange

No signal at all from start

• Is there beam?
• Check HV in Epics
• Check Low Voltage
• Check Meantimer Tresholds
• Check TRB (DAQ should do this)

some channels (<4) are missing

• Check Meantimer Tresholds

a lot of channels (>4) are missing

• Check Meantimer Tresholds
• Check HV
• Check Low Voltage

Meantimer Tresholds cannot be read/set by Epics

• Check if there is the "usual" GSI network problem, if yes, have patience
• Check if Crate is on. This can be done by connecting to the Crate CPU. Do a ping cpuname. If CPU is not responding, Check if the Crate has Power. Use a webbrowser to http://haepc04.gsi.de.

How http://haepc04.gsi.de should look like

Channel 1 is Low Voltage, Channel 2 is the TRB board. All other channel are not used. The vme crate can be rebooted directly over network only.
Switching on/off should only be done if start detector is not needed at that time (e.g. no file is written).

-- BjoernSpruck - 12 Apr 2007