PiP/TOF HV control

Written: IJDM 10/01/02
Updated: IJDM 14/01/02
Checked: JRMA 14/01/02

Hardware:

Two LeCroy 1445 multichannel high voltage power supplies are used to
provide high voltages for the PiP and ToF photomultiplier tubes.
Mainframe 1 (M1) supplies high voltages for PiP, the dE ring round the
target and the tagging efficiency detector. Mainframe 2
(M2) supplies high voltages for the TOF detectors, including the veto
layers.

Data Files:

High Voltage settings for each mainframe are stored in files
on the data acquisition computer pip.kph.uni-mainz.de.

The files are stored in the hvdata subdirectory of the acqu directory
and are named with the date they were set up. e.g.

hvdata/hvpip.08.11.01 !high voltage data file for mainframe 1
hvdata/hvtof.08.11.01 !high voltage data file for mainframe 2

File History:

pip.25.07.11                    !PiP hv values used in cosmic tests in July 2001
hvpip.08.11.01                  !detectors I0/I8 and I1/I9 replace H0/H8 and H1/H9
hvtof.08.11.01                  !Tof hv values set up by T Hehl after source tests

hvload program:

The hv data files are loaded using the hvload command.
e.g. type:
telnet pip<cr>                  !connect to pip
piptof<cr>                              !log into piptof account
password<cr>                    !enter password
cd acqu<cr>                             !go to acqu directory
hvload<cr>                              !run hvload program from acqu directory
<cr>                                    !serial device name [tty3] is default
<cr>                                    !baudrate [9600] is default
hvdata/filename<cr>             !specify data file to load e.g. hvpip.08.11.01

Editing hv data files:

FTP a copy of the data file from pip to piptof1.
Copy the old data file to a new file with a name which reflects the date (e.g. hvpip.08.11.01).
Preserve the old file.
Edit the new file on piptof1.
Transfer the new file back to pip.

Transfering hv data files:

Files may be transferred from piptof1 computer to pip using FTP.
e.g. from piptof1, type:
ftp pip<cr>                             !run ftp program
piptof<cr>                              !log into pitof account on pip
password<cr>                    !enter password for piptof account
cd acqu<cr>                             !go to acqu directory
cd data<cr>                             !go to data subdirectory
put filename<cr>                        !put the hv file into the data subdirectory
quit<cr>                                !quit ftp

hvtalk program:

To turn the high voltage on or off, or to change or examine individual channels use
the program hvtalk rather than hvload. e.g. type:

telnet pip<cr>                  !connect to pip
piptof<cr>                              !log into piptof account
password<cr>                    !enter password
hvtalk<cr>                              !run hvtalk from acqu directory
><cr>                                   !serial device name [tty3] is default
><cr>                                   !baudrate [9600] is default
>M1                                     !specify mainframe no (M1 for PiP, M2 for ToF)
>ST                                     !report status of HV power supply
>R E A                          !read all channels
>R E A C0 DO 32                 !read 32 channels starting from channel 0
>W -1000 C 35                   !write -1000V into channel 35
>W -1000 C32 DO 16              !write -1000V into channels 32 to 47
>ON                                     !switch mainframe on
>OFF                                    !switch mainframe off
>quit                                   !exit program

All the standard LeCroy 1445 commands which you can type on the hand-held controller
work with hvtalk. See 1440 mainframe manual in the "manual" cupboard beside the A2 messraum.

To switch off specific detectors:
Use hvtalk program.
Select appropriate mainframe and zero specific channels.
>W -1 C#start DO #channels

Detector	mainframe	#start	#channels
Forward ToF detectors (ToF A-D, E-H)	M2	0	128
Middle ToF detectors (ToF I-L)	M2	128	64
Backward ToF detectors (ToF M-N, O-P)	M2	192	64
ToF Veto detectors (ToF A, E, I)	M2	0 64 128	16 16 16
PiP (B-F layers)	M1	16	46
Reference Detector	M1	62	1
Tagging Efficiency detector	M1	63	1
dE rings(A, G, H(I) )	M1	0 80 192	15 16 16

To switch detectors back on:

Use hvload program.