The FELIX diagnostic station is the first station in the FELIX optical transport system. The FEL pulse is sampled online for spectrum and pulse period/amplitude-characteristics and then sent on to the various user stations. Several attenuators and filters are available. Pulse slicing can be performed here.
FELIX is horizontally polarized in the diagnostic station.
The tank where the light is being directed into the spectrum analyzer. At the bottom left the old pyro that could be rotated behind the first mirror is still visible. That mirror (with the hole) is lying on the bottom and has been replaced with another 2 inch mirror. The third mirror focusses the beam onto the entrance slit of the spectrum analyzer.
Please check for correctness, is it still up to date?, information found in Thesis of Guido Knippels (1996), "The Short-Pulse Free-Electron LAser: Manipulation of the Gain Medium" , page 26:
The spectrometer, (SpectraPRo VM-504, Acton Research, Acton MA, USA) contains 3 gratings, mounted on a remotely controlled turret. It accommodates the wavelentghrange from 5 - 110 um. The spectrum is recorded for every individual macropulse with a 48-channel pyroelectric detector array, with 600 um pitch (LIM 221, Infratec, Dresden, Germany.) Each channel is sampled with 12 bits resolution, and the bandwidth of the detector and amplifiers is 1 MHz (MKHSAD2, Microkey, Noordhoorn, The Netherlands), resulting in a 0,5 us time resolution.
All shots measured with the spectromere are saved here: \\hfmlfelixdisk\hfmlfelixdisk\data\fft\spectrometer.
The FELIX diagnostic station is remotely controllable via the Stepper driver rack, which can control 5 devices which are located inside the diagnostic station vacuum chamber.
The motors are in openloop mode and are fitted with either one or 2 limit/home switches.
These settings are read from a config file stored locally on the machine which runs the CM. These settings get published to the felixbroker after reading them from the config file.
The config file also contains the option to force the COM ports and whether the axis should be enabled or not.
This program is used to communicate with the driver rack. It runs on the machine felsax which is located near the diagnostic station. It connects with MQTT and can be controlled remotely by the user interface.
This devices communicates with 5 COM ports which are connected to a USB hub inside the 19"rack.
This program can be run from any computer which is connected to the machine-(green) or usernetwork(yellow). In order to control a device the user has to become Master Operator.
This motor is able to put the Pulse slicing silicon slab inside the FELIX beam.
The inside position is protected by the forward limit switch.
The outward position is blocked mechanically by a screw.
