Instructions for the Luminosity HV
Contact: Gregor
Geurkov
Updated: August 23, 2001
When the solenoid magnet
is ON the gain of the PMTs is
affected, therefore one has to change the HV to 70% of the max value on
the Luminosity HV screen. There is no effect by the Toroid magnet.
When the solenoid is OFF the gain of the PMTs is
increased and to reduce damage done by HV supplies in operating over the
optimum value voltage should be set to 50% of the max value.
If a channel trips then try
to reset it a couple of times. If it doesn’t work then leave it OFF. If more
than 5 channels trip then contact Gregor Geurkov or another Luminosity Expert.
Record trips in the Luminosity Log book and in the Luminosity e-log.
all PMTs at once.
If the high voltage is already on click on the top
of the HV screen on the “Set HV”
button and by holding on it drag to the desired value (in % relative of the
max)
DO NOT turn
OFF HV without ramping down to zero first. There is no STANDBY on Luminosity System.
all PMTs at once.
Click on the bottom of the panel on the “Ramp” button. Observe how voltages
change. If there are trips or it fails the first time check if voltage was
selected properly. First click on “Reset”
on the top of the panel then try to “Ramp”
once again. If the problem remains then contact Luminosity Experts (see below).
If individual channels trip then see the next section below.
If the Luminosity HV panel dies/freezes (click on “Quit” then) or was “accidentally”
closed then to start it again follow these steps. From d0lum xterm window type
cd ~d0lum/operations/config;
./show_hv &
Click on the top of the screen to “ON” HV on PMTs on. Then follow
instructions above on how to select voltages.
Luminosity Experts:
Gregor Geurkov (8am-8pm)
Michael Begel or Richard
Partridge (Th/Fr)
Office: x2638 Office: x8702
Pager: 630-314-7701 Pager: 630-218-4836 Pager:
401-751-3869
Cell: 401- 527-4497