Beam and Hall checks

In the process of editing and updating this page. Please contact Juliette Mammei crowder@jlab.org with questions or suggestions.

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Figure 1 - Alarm handler window when there is a red alarm. If nothing is alarming, it would be grey.

Figure 2 - The beeamline section in the Hall A Tools window.

Figure 3 - A picture of the scope when the raster is off. This would be BAD if beam were on!

Figure 4 - Picture of the BCM temperature readout in the computer room.

Figure 5 - Snapshot of the Fast Feedback Controls when the FFB is OFF.

Figure 6 - The gas section in the Hall A Tools window.

Figure 7 - Camera and alignment info in the Hall A Tools window.

Figure 8 - The VESDA panel in the counting house.

Figure 9 - Where you can find the camera display and the controls in the counting house.

Figure 10 - The camera controls.

Figure 11 - The Moller Polarimeter Temperature Screen with optimal values.

Alarm Handler

• VESDA System OK? (see Figure 8)
  • VESDA is the smoke/fire detection and alarm system
  • Check the Hall A VESDA Console on the wall behind the door
  • Every light should be green and in the minimum lowest alert setting.
• Is alarm handler running on hacweb7?
  • On hacweb 7, you should see a window in the upper right corner of the screen
    • Look first in the "Alarm Handler" desktop to see if it is there
    • Check all the windows if not
  • If not open, see Alarm Handler
• Is the volume up on hacweb7? (both hardware and software)
  • Go to Alarm Hall A Alarm Handler -> Setup -> Test Beep Sound

Hall A Tools and related menu screens

Beamline

• Visual Hall Inspection OK? (see Figure 9)
  • Make sure to move the camera around and zoom in (See Figure 10)
  • when complete, zoom all the way back out
• Beam Energy (MeV) (see Figure 2)
• Beam Current (µA)
• Current Target (45 degree ladder/90 degree ladder)
  • See Target GUI on Target computer
  • Or JMenu -> Search for Target GUI -> "Hall A Target Lifter" and it has the same information (as well as raster and other useful information)
• Are the Hall A Target position slow locks functioning? - Should be locked during Parity Production
  • JMenu -> Search for Orbit Lock -> Select "Orbit Locks Normal View"
  • If HallATGT is Green and Lock Status = Running then the slow locks are enabled
• Beam Position Monitor (BPM) X/Y (mm) A
• Beam Position Monitor (BPM) X/Y (mm) E (Called BPM B in Hall A Tools)

• Downstream raster (labelled B or 2, US raster is not in use) on?
  • Check the Oscilloscope in Counting House Middle Room: Yes/No
  • when raster is off, looks like Figure 3
  • when raster is on, something like halog 3654466
• Raster size (x vs. y in mm)?
  • You can also check with the JMenu -> Hall A Fast Raster screen
• Fast feedback (FFB) on? Yes/No - should be on during Parity Production
  • The easiest check is to look at the FFB information in bottom left corner of Hall A General Tools
  • An additional way to check whether the FFB is on or off:
    • in a terminal window, type JMenu
    • search for "fast"
    • Choose "Fast Feedback Control" (see Figure 5, which shows the upper left corner when FFB is OFF)
    • The status is indicated by the button that is depressed (OFF and RUN in the figure)
    • Do not use any of the Hall A Fast Feedback Control menus other than the "Fast Feedback Control" one. The screen should be small and have Hall A and C on it. You should NOT be able to edit any of the parameters.
  • FFB should be ON during normal production running!
  • However, FFB will be paused during beam modulation
  • If BPMs are saturated or for FFB troubleshooting see: FFB troubleshooting
• BCM temperature (K) (PV, PS, Thermocouple)
  • These temperature readbacks are located in the middle DAQ room, in rack CH0B06 (far left) at the very top (see Figure 4)
  • If these differ by +/-.5 from (110.0, 110.0, 115.0) (Fahrenheit) contact RC and halog
  • It is important that these temperatures stay stable within 0.5 Fahrenheit or else the BCM current readout will become uncalibrated
• Accelerator Arc Beam Energy NMR locked?
  • Go to "Energy Lock GUI" from JMenu -> Applications section -> "Energy Locks"
  • Verify if the box locked is ON/OFF - should be on during Parity Production
  • If the 3 "OR", "1A", and "2A" lights are green then the energy is locked

Hall Status

• Are the Compton Background Rates sufficiently low (<10kHz)?
  • JMenu -> Plots -> MyaPlot -> Right Click and Load a Configuration -> Select PREX in Directories -> Compton Background Rates -> Ok Move to Now
  • If you see anything above 10kHz in any of the strip charts, this is bad, and the Compton Expert on shift should be notified
• Is the Compton DAQ running? (It should be during Parity Production)
  • Ask the Compton expert on shift
• Is the Compton Photon Detector PMT High Voltage on? (It should be during Parity Production)
  • Look at the Low Voltage power supply, it is at the bottom of the electronics rack CH01B00 in the middle DAQ Counting House room.
  • It is a small box with a banana plug -> BNC cable plugged into it
  • The Voltage should read approximately 5.3 Volts
• Is the Moller Polarimeter within operational temperature limits? See Figure 11 for reference or Simona's elog entry
  • The screen can be obt ained through: NewTools -> JMenu -> "Moller Polarimeter Temperature Monitor" -> Hall A Moller Temperature
  • The optimal points are: Cryocooler (T1) ~ 3K, Magnet (T2) ~3K, Magnet Lead #1 ~40K, Magnet Lead #2 ~ 40K
  • If something happens for the Moller Polarimeter, Call Simona
• Septum current (A) and polarity? Matches whiteboard set-point?
  • JMenu -> Search for Big Bite Septum or Hall A Septum
  • Before adjusting septum please read and sign the septum OSP document (in the yellow OSP folder)

Gasses

• Pressures (see Figure 6)
  • Argon pressure (psi)
  • Ethane pressure (psi)
  • CO2 pressure (psi)

Next in checklist >> Parity Checks