1. List of terms and abbreviations
- BAM
Beam arrival monitor, monitors the time when the FEL beam arrives.
- BDA
Beam distribution area (behind the gas monitor detector).
- bunch charge
The total charge of an electron microbunch.
- CAMP chamber
CFEL ASG multipurpose chamber, with CFEL being the Center for Free-Electron Laser.
- DLD
Delay line detector, measures the (x,y) positions of electrons by two pairs of timing difference measurements.
- GMD
Gas monitor detector, measures the intensity of the FEL beam before and after the gas attenuator. It contains the parts before (GMD_Tunnel) and after (GMD_BDA) the FEL undulator tunnel. Technical details of the detector see [Tiedke08].
- FEL
Free electron laser.
- HEXTOF analyzer
High energy X-ray time of flight analyzer. A measurement device that records simultaneously the (kx, ky, E) coordinates of the photoelectrons emitted within the X-ray photoemission horizon. It is later rebranded and sold by SPECS GmbH under the name METIS.
- SASE
Self-amplified spontaneous emission.
- ToF
Time of flight.
- macrobunch
A macroscopic bunch of electrons which can possess substructures (i.e. microbunches). It is the operating unit of a high-gain FEL and also referred to colloquially as a pulse train. Each macrobunch of electrons is tagged by the macrobunch ID.
- microbunch
A subunit of a high-gain FEL pulse train due to spatial redistribution and localization of electrons within a macrobunch – a phenomenon called micronbunching. Each microbunch of electrons is tagged by a microbunch ID. A well-behaving FEL has a stable number of microbunches within a macrobunch, although the total microbunch number can vary between beam time slots due to change in the machine parameters.
- dd
Dask dataframe – a parallelized version of the pandas dataframe.
- run number
Integer label of an experimental run. Every scan shares a single run number.
- file number
Integer label of a file in an experimental run.
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Bibliography
[Tiedke08] Gas-detector for X-ray lasers. pdf