HCal High Voltage

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HCal High Voltage Information

Shift Instructions

Controlling the High Voltage

Figure 1. High voltage control GUI Main Menu.

Figure 2. High voltage control GUI HCal Right.

Figure 3. High voltage control GUI HCal Left.

Shift-takers should only turn HV on or off.

Verify first that the HV GUI is open on the slowc (hadesk9) computer. If it is not, type the following into a terminal window:

ssh -Y aslow@adaqsc
go_hv

If opening the HV GUI from the terminal, select HCal Right and HCal Left on the left side of the GUI and select the first option for each on the drop down menu (Figure 1). This should open two tabs for HCal HV on the right side of the GUI.

Select the SBS-HCAL-Right tab and scroll to the bottom (Figure 2). The HV can be turned on and off from the red and green buttons located next to "ALL CHANNELS".

Select the SBS-HCAL-Left tab and scroll to the bottom (Figure 3). The HV can be turned on and off from the red and green buttons located next to "ALL CHANNELS".

Expert Instructions

High Voltage Crate Servers

The HV crates and their individual channels are controlled via a graphical user interface (GUI) that can be run from a terminal. This GUI loads its configuration from a server run on the Raspberry Pi inside the crate. Before the GUI can be used the server must be running. If the server is already running, and it usually is, you can skip this step. To activate the server:

1. Log in to daq@enpcamsonne or any other computer on the same network as the HV crate servers (like adaq@adaq1).
2. Log into the Raspberry Pi by typing “ssh rpi20 -X -l pi” in the terminal to access the upper HV crate or “ssh rpi21 -X -l pi” for the lower HV crate. You will be prompted for a password. If you do not know it ask Scott Barcus, Alexandre Camsonne, or Bob Michaels.
3. Once logged in to the Raspberry Pi the server is started by navigating to the /home/pi/scripts/ directory. Then type “./start hv” which will start the server running.

Controlling the High Voltage

After the HV server of the desired crate is running the HV control GUI can be opened as follows:

1. To activate the GUI go to the /home/daq/slowc directory on daq@enpcamsonne. Activate the java-based GUI by typing either “./hvs UPPER” or “./hvs LOWER” depending on which crates you wish to control.
2. The GUI will then load each of the HV cards each with 12 individual channels. To turn on the HV so that individual channels can be powered click ”HV ON” on the left side and the button will turn yellow. Note: Make sure all channels enabled (see next step) are set to the desired (or reasonable) voltage setting before turning on the HV.
3. To set an individual channel’s HV enter the desired voltage for the channel in its ”target voltage” column. Then to activate the channel click the check box in the “Ch En” column. A check mark will appear, and the voltage will begin ramping up. You can see the current voltage in the “current voltage” column.
4. Note: You can leave the channels checked as on and turn off the voltage with the button on the left hand side to deactivate all channels. The button will change from yellow to grey and all voltages will read zero after a few seconds. Then if the voltage is turned back on with the same button all channels with checked boxes will begin supplying voltages again.