This section gives a quick overview on some of the important beamline parameters and status:
Autoscaling: This indicates the status of the Beamline Amplifiers (not the ES Amplifiers → see ACQ system). Green means the amplifiers are scaled automatically into the correct range (no flying scans possible); red means the amplifiers is set fixed. If you do beam tuning, this needs to be green. See here how to switch it on in BCS. See here how to switch it on in ACQ.
I1 (nA): This shows the current (in nA) of the ion chamber situated behind the FastShutter and the Slits. The proper value depends on the photon energy and the beam spot size defined by the Slits. If it's negative you don't have photons on the ion chamber and thus the sample. Without beam on I1, you cannot tune M2 Tilt and Chi2. Without beam on I1, you cannot collect data. It should fluctuate, otherwise you likely have a wrong amplifier setting and it shows a saturated value. See here how to rescale the amplifiers on BCS and on ACQ.
Fast Shutter: Status of the Fast Shutter. Red is closed, green is open. You can change the status on BCS or ACQ.
Filters: Status of Filters. Red is In, Green is Out. See here how to insert or extract filters.
PSS Status: This shows the status of the main shutter of the BL 12.2.2 hutch. (PSS 211). Red means closes, green means open. The status is also indicated on the green LED above your head
To change the shutter status, you can either press the open button (#$) on rack BL1252 above your head (i.e,. what you learned in "ALS Beamline Hutch Training" here: https://safety.als.lbl.gov/ALS5832/story_html5.html and shown to you by the BL scientist), or you can open it on the 12.2.2 EPS site.
Mono Type: This shows you which of the two monochromators (Si(111) double crystal or W/B4C-multilayer) is in use. This is the only field in this box that can be changed. Please do not attempt to change the mono type unless you really, really know what you are doing. If in doubt call BL staff.
Imono Out (nA): This indicates gives the photon flux (measured and amplified as nA of a diode) on the Imono Out diode. If this value is zero, you will not have beam out of the monochromator. The correct value is dependent on energy and storage ring current. Tune the rocking curve if in doubt, or call the beamline staff.
Energy (eV): This gives the currently chosen photon energy in eV. See here how to change that.
Imono In (nA): This shows the photon beam (measured and amplified as nA of a diode) incident on the monochromator. If this value is zero, there is most likely no e-- beam in the storage ring (and hence no X-rays on your sample). Call the floor ops or the beamline scientist for more information on what is going on.
