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Operating the beamline



General

The user-controlled electropneumatic valves of the beamline (labelled by numbers 1-10 in the screenshots) can be controlled either using the BCS webpage (single click on the valve) or the BCS section of the Kleopatra software (double click on the valve) from the MSB-MASTER computer (or its VNC copy on the MSB-STATION computer).

This procedure opens a webpage where the desired command (1) open or (0) close can be selected and Submitted. It will open another webpage with the result of the operation.

The status of each valve is indicated by color (green - closed, red - open). The displayed status is refreshed only every 10-40 s.

Before using the beam the beamline must be open for at least 30 minutes in order to reach thermal stability of its optical elements (warm-up), mainly of the prefocusing mirror, which is being hit by the most intense light. (40 W incident, of which 90% absorbed).

Opening the beamline

  1. Check that the beam is available for users (beam energy ≥2 GeV, accumulated current ≥100 mA, machine status User Dedicated, "luce utenti" announced).
  2. Check that the pressures along the beamline are in the 10-9 mbar order or below (except for the shutter chamber being 10-7 mbar due to incorrect measurement).
  3. Open the electropneumatic valves 9 to 1 (in this order!). After this you should observe some mesh current in the Mesh Monitor software.
  4. Wait at least 30 min (until the mesh current stabilizes).
  5. Proceed with setting the beam position if needed.
  6. Open the electropneumatic valve 10.
  7. Proceed with sample alignment (full or fast check as needed).
  8. Start your measurements.

Closing the beamline

  1. Close the electropneumatic valve 10 if not done before).
  2. Close the electropneumatic valves 1 to 9 (in this order!).

Notes

Valves a, b and c cannot be controlled by the user.
  • Valves a and b are closed by the machine operators before the injection (e.g. in the case of a beam dump) and open after it. If the operators forget to open them after the injection call the Control Room (telephone number is on the machine status webpage) and ask kindly to open the machine shutter of the beamline 6.1 Materials Science.
  • Valve c is a security fast valve closed automatically if vacuum is broken.
Valves 1 and 3 (shutter and stopper) are also closed by the machine operators before the injection (e.g. in the case of a beam dump), locked during the injection (symbol  in Kleopatra) but not open automatically after. So when possible, open them in the correct order. (valve 3 and then valve 1). If they keep being locked although the injection is finished (machine status User Dedicated, "luce utenti" announced), call the Control Room (telephone number is on the machine status webpage) and ask the operator to unlock the beamline shutters and stoppers.

The correct opening/closing order of valves 1-7  is important. The scope is to avoid hitting any of the valves 2-7 by the photon beam when they are closed. Therefore the valve 1 should be open as the last one and closed as the first one, as it is the only one that can support the heat load of the beam (it is water-cooled). Although there are some interlocks that should avoid user errors please be sure to respect the correct order.

Open the valve 10 to the experimental chamber only for the period of photoemission measurements and close it immediately after. Double-check that it is closed especially when performing operations leading to pressure increase in the experimental chamber, typically sample transfer, ion sputtering or gas exposure, or during photoemission with X-ray source (to avoid mixing two different excitations). Moreover, some sensitive samples might be damaged by long exposures to the photon beam so there is no reason to illuminate them when not needed.

If the BCS webpage does not open at all and the BCS section of Kleopatra is of grey color and does not react on double-clicks on valves wait for several minutes. If the problem persists follow Troubleshooting - BCS communication problem.

Last Updated on Wednesday, 28 February 2018 13:58