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Commissioning and Characterization of Two Undulators at the MAX IV 3 GeV Storage Ring

Mikaelsson, Sara LU (2016) EITM01 20161
Department of Electrical and Information Technology
Abstract
Insertion devices have several undesirable effects on the beam dynamics of a synchrotron storage ring, and these must be compensated for in order to ensure long term stable operation. This master’s thesis concerns the two first insertion devices at the MAX IV facility, two in-vacuum undulators for the BioMAX and NanoMAX beamlines. The report presents the work done to neutralize closed-orbit distortions caused by the undulators using a feed-forward scheme, as well as investigations into effects on the optics, and non-linear effects on lifetime and beam size. An algorithm was developed which was able to automatically find feed-forward tables which reduced the closed-orbit distortions to noise level. This algorithm was adapted to be usable... (More)
Insertion devices have several undesirable effects on the beam dynamics of a synchrotron storage ring, and these must be compensated for in order to ensure long term stable operation. This master’s thesis concerns the two first insertion devices at the MAX IV facility, two in-vacuum undulators for the BioMAX and NanoMAX beamlines. The report presents the work done to neutralize closed-orbit distortions caused by the undulators using a feed-forward scheme, as well as investigations into effects on the optics, and non-linear effects on lifetime and beam size. An algorithm was developed which was able to automatically find feed-forward tables which reduced the closed-orbit distortions to noise level. This algorithm was adapted to be usable for future insertion devices at MAX IV. The tune shift and beta-beat was determined to be negligible and no compensation scheme was implemented. Beam displacement measurements were attempted and found to have insufficient range, thus highlighting the need for other methods to investigate nonlinear effects in the future. (Less)
Popular Abstract
In the public mind, accelerators are tools of particle physicists; huge machines which collide particles in the hope of uncovering the fundamental nature of matter. A more common type of accelerator is the synchrotron light-source, where the particles are of less interest than the light they emit. The devices that produce this light, however, cause disturbances which must be neutralized.
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author
Mikaelsson, Sara LU
supervisor
organization
course
EITM01 20161
year
type
H2 - Master's Degree (Two Years)
subject
keywords
accelerator physics, MAX IV, insertion device pertubations, beam dynamics, orbit correction
report number
LU/LHT-EIT 2016-542
language
English
id
8892021
date added to LUP
2016-10-04 08:52:25
date last changed
2016-10-05 14:57:19
@misc{8892021,
  abstract     = {Insertion devices have several undesirable effects on the beam dynamics of a synchrotron storage ring, and these must be compensated for in order to ensure long term stable operation. This master’s thesis concerns the two first insertion devices at the MAX IV facility, two in-vacuum undulators for the BioMAX and NanoMAX beamlines. The report presents the work done to neutralize closed-orbit distortions caused by the undulators using a feed-forward scheme, as well as investigations into effects on the optics, and non-linear effects on lifetime and beam size. An algorithm was developed which was able to automatically find feed-forward tables which reduced the closed-orbit distortions to noise level. This algorithm was adapted to be usable for future insertion devices at MAX IV. The tune shift and beta-beat was determined to be negligible and no compensation scheme was implemented. Beam displacement measurements were attempted and found to have insufficient range, thus highlighting the need for other methods to investigate nonlinear effects in the future.},
  author       = {Mikaelsson, Sara},
  keyword      = {accelerator physics,MAX IV,insertion device pertubations,beam dynamics,orbit correction},
  language     = {eng},
  note         = {Student Paper},
  title        = {Commissioning and Characterization of Two Undulators at the MAX IV 3 GeV Storage Ring},
  year         = {2016},
}