Application of a simple asynchronous mechanical light chopper to multielectron coincidence spectroscopy

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3258200· OSTI ID:22051104

Ito, Kenji; Suzuki, Isao H ^[1]; Penent, Francis; Lablanquie, Pascal ^[2]; Hikosaka, Yasumasa; Shigemasa, Eiji ^[3]; Eland, John H. D. ^[4]

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1. Photon Factory, IMSS, KEK, Oho 1-1, Tsukuba, Ibaraki 305-0801 (Japan)
2. Universite Pierre et Marie Curie (UPMC), 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 (France)
3. UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585 (Japan)
4. PTCL, Oxford University, South Parks Road, Oxford OX1 3QZ (United Kingdom)

A simple asynchronous mechanical light chopper, based on modification of a turbo-molecular pump, has been developed to extend the interval between light pulses in single bunch operation at the Photon Factory storage ring. A pulse repetition rate of 80 kHz was achieved using a cylinder rotating at 48000 rpm, with 100 slits of 80 {mu}m width. This allows absolute timing of particles up to 12.48 {mu}s instead of the single-bunch period of 624 ns. We have applied the chopper together with a light pulse monitor to measure multielectron coincidence spectra using a magnetic bottle time-of-flight electron spectrometer. With such a system, the electron energies are determined without any ambiguity, the folding of coincidence spectra disappears and the effect of false coincidences is drastically reduced.

• OSTI ID: 22051104
• Journal Information: Review of Scientific Instruments, Vol. 80, Issue 12; Other Information: (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BEAM OPTICS
COINCIDENCE SPECTROMETRY
ELECTRON SPECTROMETERS
ELECTRON SPECTROSCOPY
ELECTRONS
KHZ RANGE
MODIFICATIONS
OPERATION
OPTICS
PHOTONS
PULSES
PUMPS
RADIATION MONITORS
STORAGE RINGS
TIME-OF-FLIGHT METHOD
VISIBLE RADIATION