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Coupling and Brightness Considerations for the MAX IV 3 GeV Storage Ring

Leemann, Simon LU and Eriksson, Mikael LU (2013) PAC'13 (2013 Particle Accelerator Conference) In PAC 2013 Proceedings p.243-245
Abstract
It is often suggested that the emittance coupling of a storage ring should be adjusted to the so-called diffraction limit corresponding to the shortest wavelength of interest. For 1 Å radiation this leads to a typical requirement of 8 pm rad vertical emittance. In ultralow-emittance storage rings like the MAX IV 3 GeV storage ring this corresponds to a comparably large setting of the emittance coupling (2.5%). This approach, however, does not produce the brightest radiation and needs to be revisited taking into account that overall photon brightness depends on the emittances of the electron beam and the intrinsic photon beam. This paper summarizes an analytic approach to maximizing brightness as a function of emittance coupling while... (More)
It is often suggested that the emittance coupling of a storage ring should be adjusted to the so-called diffraction limit corresponding to the shortest wavelength of interest. For 1 Å radiation this leads to a typical requirement of 8 pm rad vertical emittance. In ultralow-emittance storage rings like the MAX IV 3 GeV storage ring this corresponds to a comparably large setting of the emittance coupling (2.5%). This approach, however, does not produce the brightest radiation and needs to be revisited taking into account that overall photon brightness depends on the emittances of the electron beam and the intrinsic photon beam. This paper summarizes an analytic approach to maximizing brightness as a function of emittance coupling while retaining sufficient lifetime. Instead of "meeting the diffraction limit", we further reduce the coupling, thus increasing both the brightness and transverse coherence of the emitted radiation. We derive that reducing the MAX IV 3 GeV storage ring's vertical emittance to 2 pm rad (0.6% coupling) will increase brightness and transverse coherence by almost a factor two while 10 h overall lifetime can still be achieved. (Less)
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author
organization
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Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
PAC 2013 Proceedings
pages
3 pages
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
conference name
PAC'13 (2013 Particle Accelerator Conference)
ISBN
978-3-95450-138-0
language
English
LU publication?
yes
id
b22e50c2-ed76-4081-85d1-e888a8b9882a (old id 4248807)
alternative location
http://accelconf.web.cern.ch/AccelConf/PAC2013/papers/mopho05.pdf
date added to LUP
2014-01-14 22:51:38
date last changed
2016-04-16 09:21:05
@inproceedings{b22e50c2-ed76-4081-85d1-e888a8b9882a,
  abstract     = {It is often suggested that the emittance coupling of a storage ring should be adjusted to the so-called diffraction limit corresponding to the shortest wavelength of interest. For 1 Å radiation this leads to a typical requirement of 8 pm rad vertical emittance. In ultralow-emittance storage rings like the MAX IV 3 GeV storage ring this corresponds to a comparably large setting of the emittance coupling (2.5%). This approach, however, does not produce the brightest radiation and needs to be revisited taking into account that overall photon brightness depends on the emittances of the electron beam and the intrinsic photon beam. This paper summarizes an analytic approach to maximizing brightness as a function of emittance coupling while retaining sufficient lifetime. Instead of "meeting the diffraction limit", we further reduce the coupling, thus increasing both the brightness and transverse coherence of the emitted radiation. We derive that reducing the MAX IV 3 GeV storage ring's vertical emittance to 2 pm rad (0.6% coupling) will increase brightness and transverse coherence by almost a factor two while 10 h overall lifetime can still be achieved.},
  author       = {Leemann, Simon and Eriksson, Mikael},
  booktitle    = {PAC 2013 Proceedings},
  isbn         = {978-3-95450-138-0},
  language     = {eng},
  pages        = {243--245},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  title        = {Coupling and Brightness Considerations for the MAX IV 3 GeV Storage Ring},
  year         = {2013},
}