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Using ACNET for monitoring

(A full list of ACNET devices is in ACNET)

To launch ACNET, in a terminal window as ftbf_user on an ftbflxNN machine (NN= 01, 15, 18 etc) execute the following commands:
[Note: if you SSH into a computer already running ACNET, and then launch the ACNET console, it will crash for both users. This can be fixed by SSHing into another ftbflxNN machine.]

From ROC West:

cd /home/lariat/acnet
./launch_acnet_console

From the MCenter control room:

setup ftbf
cd /home/nfs/ftbf_user/acnet
./launch_acnet_console

Access the main monitoring page

Launching the ACNET console many windows will pop out. From the main window, select the page S60 (at the top left corner type in S60, which will appear in red, then press enter), sub-page 1 (you can select it at the beginning of the 4th line).
Note that the MCNTR tab is selected in the 5th line (indicated by yellow). Displayed are various counters along the MCenter beam line.

In the now S60 PPD Params window, under MC-7 magnets section:

  • MC7AN is the current of the magnets (yellow number). Remember to report this number when starting a run.
  • MC7AT1 states the temperature (degF) of the coil of magnet 1. Alarm above 175º F. (The yoke temperature is MC7AT2)
  • MC7AT3 states the temperature (degF) of the coil of magnet 2. Alarm above 175º F. (The yoke temperature is MC7AT4)
  • MC7ANB is a probe inserted in our magnets to measure the polarity of the field. The actual value stated is not important as only the sign matters. Double check that the polarity is the right one (positive or negative) required for the run and remember to report its value in the elog when starting a run. Its sign should be the same as MC7AN, where the sign is shown next to R... See the Run_Plan for the sign it should be (+/- # A).
Under Tertiary Beam section:
  • MC7SC1 states the number of counts for the scintillator counter before the LArIAT target. Intensity of the secondary beam. 1E5 or more is pretty good.
  • MC7SC2 states the number of counts for the scintillator counters after the last magnet.
  • MC7SC3 states the number of counts for the scintillator counters after the Wire Chamber 4.
  • MCENRG states the energy of the secondary beam at the LArIAT target.

It can happen at the start of the ACNET program that the last two parameters, MC7AT1 and MC7AT3, are not shown in the S60 window. If this is the case, double click at the beginning of one of the empty lines under MC-7 magnets section (there will likely be two empty lines between F:MC7AN and F:MC7SC1 - use these). A string will appear corresponding to a random parameter. Move the red cursor to the first character (if not already there), type in F:MC7AT1 (it will overwrite the previous string) and press enter. The string will turn blue and description and value of the parameter will appear on the right. Repeat on a new line for F:MC7AT3.

How to display the wire chambers positioned before the LArIAT target (along the secondary beam line)

From one of the P#:## (with # being a character between A and E and ## being any other character) windows opened by the ACNET program:
  • Position the cursor in the upper left corner of the page, over the yellow character (corresponding to the ## character in the window title), type S39 and press enter. This will open the S39 Swics page.
  • Click in the space between MC7WC1 and <I> (box #9) and in the space between MC7WC2 and <I> (box #10). This will select the two wire chambers for the plot.
  • Click on ◆Start Plot◆ and select from the pop-out menu Subtract noise from data.
  • A Slots menu will appear. Click SA.
  • Click on the bg2 on the list (number 03)
    A new window will be created showing horizontal and vertical distributions of particles crossing MC7WC1 (a wire chamber UPSTREAM the LArIAT target) and MC7WC2 (a wire chamber upstream the LArIAT target, close by both the target and MC7SC1). The histograms are refreshed after each spill and give an idea of the tuning of the beam hitting the LArIAT target.

Make sure the magnet has the current for the run you’re about to take!!!

Things to keep an eye on during the run

  • Monitor the number of counts at SC1, checking that they are consistent spill to spill. Sometimes, due to some problem on the beam line, there may empty spills. If the lack of beam persists for a considerable amount of time (>10-15 minutes), check the Main Control room Elog (you may have to refresh the page). In case of a serious problem they’ll post it there. If there’s a post it means they are aware of the problem and they’re already trying to fix it. No need to call them. If the absence of beam and/or trigger persists and nothing shows up in the elog, call the control room to report the problem/ask info. When calling provide following information
    1. Location (MCenter)
    2. Intensity of the beam (MC7SC1 counts) if requested.
  • Monitor the temperature of the magnets: in the S60 window of the ACNET program the MC7AT1 and MC7AT3 parameters in MC-7 magnets section are the temperatures of the coils for magnets 1 and 2. This value should not exceed 170º F. If it does, Main Control Room will call the shifter to inform they want to lower the magnet currents. If they don’t call, call them to ask to lower the magnet’s current. If these parameters are not present in the window, add them according to the instruction reported above.
  • Monitor the profile plots for MC7WC1 and MC7WC2. In particular, the horizontal and vertical distribution of MC7WC2 (the closest to the target) must be well centered, to ensure the secondary beam is focused onto the target. If the profile distributions result too wide or off-center, call the MCR and (kindly!) ask for an improvement of the beam tuning (they may already be working on it).
  • If you need to change the magnet current between runs, go to the MC7AN line and click on the yellow parameter to the left of the green one (as in the above image) and you will be allowed to type in a new value. Press Enter when done, and wait a few spills for the measured green current to be updated. The previous setting will now be displayed in pink to the left of the yellow value. (You may be told to unlock setting permissions when trying to change ACNET parameters. If so, go to the Utilities CLX### window, click Settings, and unlock for however long you need. To be safe, make it just 10 minutes to minimize the chance of accidentally changing some other value!)

Less-critical information to plot - not required during standard shifts!

The section shows how to plot the beam spill structure and how to retrieve historical data.
These are not critical information and are generally not needed during a standard shift.

Plots of spill structure and beam intensity vs time

In the Utilities CLX### window opened by the ACNET program:
  • click on ◆FTP◆;
  • click on ◆Restore◆;
  • select Switchyard from the menu;
  • select 4 MCenter Supercycle;
  • Click anywhere inside the blue box BUT NOT over any number of variable. A new window will appear showing in real time the beam intensity (red) and the cumulative number of counts at SC1 (green) for each supercycle. In case of empty spill no green line will appear. For non-empty spill the green line will raise for the first 4 seconds (spill duration) and stay flat for the rest of the cycle.

Always from the Utilities CLX### window:
  • choose a new window for the next plot by clicking on *S#◆ (with # varying from A to E) at the top left of the window and selecting a window name different from the current one.
  • click on ◆Restore◆;
  • select Switchyard from the menu;
  • select 6 MCenter Beam;
  • Click anywhere inside the blue box BUT NOT over any number of variable. A new window will appear showing in real time the cumulative number of counts at SC1, SC2, SC3 and SC5. A new line is drawn for each counter at each cycle.

Retrieving historical data from ACNET

It is possible to retrieve historical data about SC1, SC2, SC3, and SC5 # of counts in a user-defined time range.
If you are really curious about it, go on reading.

From one of the P#:## (with # being a character between A and E and ## being any other character) windows opened by the ACNET program:
  • Position the cursor in the upper left corner of the page, over the yellow character (corresponding to the ## character in the window title), type D44 and press enter. This will open the D44 Lumberjack Plotter page.
  • Click on ◆User◆ and select from the pop-out menu LArIAT (you can use the bar search at the top of the window to quickly access it).
  • Click on ◆Recall◆ and select Beam from the pop-out window.
  • The D44 Lumberjack Plotter page is now showing the variables that are going to be plotted: Beam, MC7SC1, MC7SC2, MC7SC3, MC7SC5. Set the variable T1 to the starting date and time you want and the variable T2 to the ending date and time. Clicking on ◆T2 Now◆ will automatically set T2 to the present time.
  • Click anywhere in the area where the variables’ name are reported and a new window will appear with the plot of the variables in the defined time range. The plot does not refresh itself. Hence, to update click again on ◆T2 Now◆ and then on the area of the window in between the variable’s names.