Ultra low vertical emittance at SLS through systematic and random optimization

Aiba, M.; Böge, M.; Milas, Natalia; Streun, A.

doi:10.1016/j.nima.2012.08.012

Cited by 35 publications

(19 citation statements)

References 13 publications

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“…Though ε yOQ and ε yVU are not in agreement within experimental uncertainties, this emittance measured using a direct measurement technique is equal in magnitude to the current record low vertical emittance of Ref. [8].…”

Section: Discussioncontrasting

confidence: 72%

“…This emittance range is of contemporary importance for proposed electronpositron collider damping rings, to optimize for maximum luminosity [4,5]. These vertical emittances will be achieved using low-emittance tuning optimization routines, which are the subject of active research at many electron storage ring light sources [6][7][8][9][10][11][12]. The effective use and experimental verification of these optimization routines rely upon measurement of vertical emittance.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of ultralow vertical emittance using a calibrated vertical undulator

Wootton

Boland

Rassool

2014

Phys. Rev. ST Accel. Beams

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Very few experimental techniques are useful for the direct observation of ultralow vertical emittance in electron storage rings. In this work, quantitative measurements of ultralow (pm rad) electron beam vertical emittance using a vertical undulator are presented. An undulator radiation model was developed using the measured magnetic field of the APPLE-II type undulator. Using calibrated experimental apparatus, a geometric vertical emittance of ε y ¼ 0.9 AE 0.3 pm rad has been observed. These measurements could also inform modeling of the angular distribution of undulator radiation at high harmonics, for proposed diffraction-limited storage ring light sources.

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Section: Discussioncontrasting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Measurement of ultralow vertical emittance using a calibrated vertical undulator

Wootton

Boland

Rassool

2014

Phys. Rev. ST Accel. Beams

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“…The tuning was based on iterative response matrix measurement of 36 available skew quadrupoles (12 of them in dispersive sections), and subsequent matrix inversion and application of skew quad strengths for minimum vertical dispersion and minimum betatron coupling around the ring. On top of this, a random optimization was performed [2].…”

Section: Beam Size Measurementsmentioning

confidence: 99%

“…The monitor uses the so-called π-polarization method to determine the vertical beam size from vertically polarized (π-polarized) vis-UV SR imaged onto a CCD camera. During measurements in 2011 the first monitor has reached its resolution limit [2] which is determined by a combination of many factors such as the transverse optical magnification of the source, the camera resolution but also the fact that complementary methods are not available. As a part of the TIARA work package 6 [3] and in collaboration with the MAX IV Laboratory a new emittance monitor was designed and commissioned at the SLS.…”

Section: Introductionmentioning

confidence: 99%

Methods for measuring sub-pmrad vertical emittance at the Swiss Light Source

Breunlin

Andersson

Milas

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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“…In particular, LOCO has been used as the cornerstone for corrections at both the Swiss Light Source (SLS) and the Australian Synchrotron, where vertical emittances of order 1 pm have been reported [7,8].…”

Section: Introductionmentioning

confidence: 99%

Low-emittance tuning at the Cornell Electron Storage Ring Test Accelerator

Shanks

Rubin

Sagan

2014

Phys. Rev. ST Accel. Beams

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In 2008 the Cornell Electron/Positron Storage Ring (CESR) was reconfigured from an electron/positron collider to serve as a test bed for the International Linear Collider damping rings. One of the primary goals of the CESR Test Accelerator (CesrTA) project is to develop a fast low-emittance tuning method which scales well to large rings such as the ILC damping rings, and routinely achieves a vertical emittance of order 10 pm at 2.085 GeV. This paper discusses the tuning methods developed at CesrTA to achieve lowemittance conditions. One iteration of beam-based measurement and correction requires about 10 min. A minimum vertical emittance of 10.3ðþ3.2= − 3.4Þ sys ðAE0.2Þ stat pm has been achieved at 2.085 GeV. In various configurations and beam energies the correction technique routinely achieves vertical emittance around 10 pm after correction, with rms coupling < 0.5%. The measured vertical dispersion is dominated by beam position monitor systematics. The propagation of uncertainties in the emittance measurement is described in detail. Simulations modeling the effects of magnet misalignments, beam position monitor errors, and the emittance correction algorithm suggest the residual vertical emittance measured at the conclusion of the tuning procedure is dominated by sources other than optics errors and misalignments.

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Ultra low vertical emittance at SLS through systematic and random optimization

Cited by 35 publications

References 13 publications

Measurement of ultralow vertical emittance using a calibrated vertical undulator

Measurement of ultralow vertical emittance using a calibrated vertical undulator

Methods for measuring sub-pmrad vertical emittance at the Swiss Light Source

Low-emittance tuning at the Cornell Electron Storage Ring Test Accelerator

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