Journal Article

FZJ-2019-06262

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Phase-locked MHz pulse selector for x-ray sources

Förster, D.FZJ* ; Lindenau, B.FZJ* ; Leyendecker, M.FZJ* ; Janssen, F.FZJ* ; Winkler, C. ; Schumann, F. O. ; Kirschner, J. ; Holldack, K. (Corresponding author) ; Föhlisch, A.

2015
Soc. Washington, DC

This record in other databases:      

Please use a persistent id in citations: doi:10.1364/OL.40.002265

Abstract: Picosecond x-ray pulses are extracted with a phase-locked x-ray pulse selector at 1.25 MHz repetition rate from thepulse trains of the accelerator-driven multiuser x-ray source BESSY II preserving the peak brilliance at high pulsepurity. The system consists of a specially designed in-vacuum chopper wheel rotating with ≈1 kHz angular frequency.The wheel is driven in an ultrahigh vacuum and is levitated on magnetic bearings being capable of withstandinghigh centrifugal forces. Pulses are picked by 1252 high-precision slits of 70 μm width on the outer rim of thewheel corresponding to a temporal opening window of the chopper of 70 ns. We demonstrate how the electronicphase stabilization of +-2 ns together with an arrival time jitter of the individual slits of the same order of magnitudeallows us to pick short single bunch x-ray pulses out of a 200 ns ion clearing gap in a multibunch pulse train asemitted from a synchrotron facility at 1.25 MHz repetition rate with a pulse purity below the shot noise detectionlimit. The approach is applicable to any high-repetition pulsed radiation source, in particular in the x-ray spectralrange up to 10 keV. The opening window in a real x-ray beamline, its stability, as well as the limits of mechanicalpulse picking techniques in the MHz range are discussed.

Keyword(s): Instrument and Method Development (1st)

Note: Used for Low Dose Photoelectron Spectroscopy at the PM4 beamline at BESSY II

---

Contributing Institute(s):

1. Zentralinstitut für Technologie (ZEA-1)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

---

Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

---