BBCal HV Controls

<<SBS Main<< HOW TOs (BigBite Spectrometer)

Big Bite High Voltage Information

Shift Instructions

Controlling the High Voltage

Figure 1. High voltage control GUI Main Menu.

Figure 2. High voltage control GUI Preshower.

Figure 3. High voltage control GUI Shower.

Figure 4. BBCal HV Control GUI (Crate View). Used to load new HV setting.

Figure 5. Steps to Load new HV setting for BBCal

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 Preshower and Shower on the left side of the GUI under in "BB" and select the first option for each on the drop down menu (Figure 1). This should open two tabs for Preshower and Shower on the right side of the GUI.

Select the BB-Preshower 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 BB-Shower 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".

Loading a New High Voltage File

Open a terminal window from any Hall A counting hall machine and execute:

vncviewer adaq1:6 -shared

Password is same as the standard adaq account password, which you should be able to find written somewhere in the Hall A counting hall. You should see a HV control GUI open (crate view) as shown in Figure 4. Use the GUI to load the desired HV settings following the 4 steps shown in Figure 5.

• Failure Modes:

1. The GUI is not up on the vnc window: In such a case please follow the instructions written below to relaunch the GUI.
2. The vncserver is non-existing: In such a case please do not waste time in setting up another vncserver, instead go ahead and open a terminal on the computer you are on and follow the instructions written below to launch the GUI. Afterwards notify an expert.

If for some reason you find that the GUI is not up in the vnc window, then open a terminal inside the vnc window and execute the following commands:

ssh -Y aslow@adaqsc
cd JAVA/slowc_bbcal
./hvs BBCAL

Give it a couple of minutes to load and after that the GUI should be ready to use.

Saving High Voltage File

In order to generate calibrated HVs using a cosmic run we need to have the HV settings saved for that run. Here is a step-by-step guidance:

1. Make sure the HV hasn't been changed since the run was taken. (Very Important)
2. Pull up the HV control GUI following the instructions in the Loading a New High Voltage File section.
3. Select "File" tab in the menu bar and then "Save Voltage Set".
4. In "File Name" box, write: run_<runnum>_hv.set
5. Hit "Save".

NOTE: It is important to follow the naming format mentioned in Step 4. Replace <runnum> with appropriate run number.

Expert Instructions

• Monitoring and setting the high voltage (needs checked after move to Hall).
• Updating BBCal HV Settings for new B-field configurations at different kinematics.