Checklist for North Area access:

  • Dosimeter and online training course for Supervised Radiation Areas (
  • Helmet and safety shoes (
  • Access right to all H6 control rooms (request via EDH): H6C: HNA-457 (0887-1-Q54, YSASE-00259), HNA-455 (0887-1-R53, YSASE-00258), H6B (0887-1-R52, YSASE-00257) and H6A (0887-1-Q45, YSASE-00235). Activate access right on your CERN access card at one of the validation stations (
  • For using CERN rental car, request "CERN vehicle driving license (V)" via EDH
  • Park in front of bldg. 890. Walk to North Hall (bldg. 887) through bldg. 907. Swipe dosimeter in front of electronic lock next to the entrance door. Turn left inside bldg. 887. Control room Q54 (H6C) is used by us for the telescope located in H6B (zone 156). It is on the left-hand side of the upper level. Swipe CERN access card in front of electronic lock.

Nomachine connection to computer in small control room

  • download Nomachine at
  • open terminal (MacOsX or Linux)
  • type in ""ssh -L (your CERN username)""
  • for windows users using PuTTY:
    • Open the configuration window an put as Host Name
    • Under Connection -> Data -> put in your CERN username
    • Under SSH -> X11 -> Check the 'Enable X11 forwarding' option
    • Under SSH -> Tunnels -> Set the source port to 14000 and the destination to then click add
    • save the session and connect
  • in NoMachine, new connection to localhost on port 14000 (uncheck UDP in Advanced)
  • username: telescope
  • To avoid that the main screen gets resized to a too small resolution when connecting, make sure that the resizing of the remote screen is disabled in your local (client) connection settings file: find your connection settings file on your local machine (e.g. on Mac: ~/Documents/NoMachine/pclcd47.nxs) and in there set the entry "Resize the remote screen to the local geometry" to "false".
  • When Nomachine server crashes, you can try to run "sudo systemctl restart nxserver" on pclcd47.

Vistars SPS machine status monitor

Beam control with CESAR

  • The PC for controlling the zone access and the beam settings is usually located in the main H6B control room.
  • The program to monitor and modify the beam settings is called CESAR. If it is not running, start it from the control panel. A GUI will open.
  • To open/close to door/beam stopper in front of our setup:
    • Click on the door-icon with the name "Access command".
    • Select the door PPE156.
    • Press "Open" to close the door/beam stopper in front of the setup for access.
    • Press "Beam" to open the door/beam stopper if you want to start test beam measurement.
    • You will be asked to enter your CERN user name and password.
    • It takes about 2 minutes before the beam stopper starts moving.
    • You can enter the zone only, when the door is in "Open".
  • The beam rate in the scintillator counter at the beginning of the H6B zone (~10 cm x 10 cm acceptance) is visible under "Trigger Status" as XSCI.041.532. The coincidence rate in our telescope scintillator setup (~2 cm^2 acceptance) is visible under "Scaler Status" as EXPT.HNA457.001. The rates are integrated over one spill. Our coincidence rate is less than the beam scintillator rate (typically factor 3-4), because the beam is not fully contained in our acceptance.
  • The beam rate is limited by the alarm levels of the radiation monitor PAXN16601, which is installed in PPE166 behind our zone. It shows the ionising dose integrated over a fixed time. Therefore the maximum beam rate depends on the super-cycle composition (number of North-Area spills per supercycle and supercycle length). The warning level (accustic signal in the hall) for this monitor is 15 uSv / h, the automatic shutdown level is 30 uSv / h.

Remote access to CESAR

Accelerator status / logging data

  • AFT for accelerator fault tracking:
  • Timber for display of CERN accelerator logging data: (For example: "Variables" --> "SPS.T4:INTENSITY" to see the target intensity over time. This way one can check if there was no beam over night)

DominikDannheim - 2021-09-16

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Topic revision: r15 - 2023-05-17 - PeterSvihra
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