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TH3B1 |
Development of the In-vacuum APPLE II Undulators at HZB |
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- A. Meseck, J. Bahrdt, S. Gaebel, S. Gottschlich, S. Grimmer, C. Kuhn, F. Laube, E.C.M. Rial, M. Scheer, P.I. Volz
HZB, Berlin, Germany
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HZB is working on a concept for BESSY III, the successor to BESSY II. It is planned to be a 4th generation synchrotron light source with an emittance of about 100 pm rad and an energy of 2.5 GeV. BESSY III will be equipped with advanced undulators to provide users with tailor-made light. Since polarisation control in the soft X-ray region is important for BESSY users, a variety of APPLE II undulators are planned, such as conventional (in-air), in-vacuum, cryogenic in-vacuum and double-period in-vacuum APPLE undulators (DoPUs). HZB has a long and successful tradition in the design, construction, and operation of conventional APPLE II devices. Currently, the first in-vacuum APPLE II undulator (IVUE32) is being built at HZB. In addition, the technical design of the cryogenic version of the In-Vacuum APPLE II (Cryo-APPLE) is progressing; construction will start at HZB in the next few years. This paper reports on the status of the In-Vacuum APPLE II and the Cryo-APPLE and outlines future development plans.
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Slides TH3B1 [6.205 MB]
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| TH3B2 |
Novel X-ray Beam Position Monitor for Coherent Soft X-ray Beamlines |
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- B. Podobedov, D.M. Bacescu, C. Eng, S. Hulbert, C. Mazzoli, C.S. Nelson
BNL, Upton, New York, USA
- D. Donetski, K. Kucharczyk, J. Liu, R. Lutchman, J. Zhao
Stony Brook University, Stony Brook, New York, USA
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A novel soft X-ray BPM (sXBPM) for high-power white beams of synchrotron undulator radiation is being developed through a joint effort of BNL/NSLS-II and Stony Brook University. In our approach, custom-made multi-pixel GaAs detector arrays are placed into the outer portions of the X-ray beam, and the beam position is inferred from the pixel photocurrents. Our goal is to achieve micron-scale positional and ~50 nrad angular resolution without interfering with user experiments, especially the most sensitive ones exploiting coherent properties of the beam. To this end, an elaborate mechanical system has been designed, fabricated, and installed in the 23-ID canted undulator beamline first optical enclosure, which allows positioning of the detectors with micron-scale accuracy, and provisions for possible intercepts of kW-level beam in abnormal conditions. Separately, GaAs detectors with specially tailored spectral response have been designed, fabricated, and tested in the soft and hard X-ray regions at two NSLS-II beamlines. In this talk we plan to give an overview of the sXBPM system and present the first results from the high-power white X-ray beam.
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Slides TH3B2 [5.100 MB]
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| DOI • |
reference for this paper
※ doi:10.18429/JACoW-FLS2023-TH3B2
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| About • |
Received ※ 15 September 2023 — Revised ※ 15 September 2023 — Accepted ※ 17 September 2023 — Issued ※ 02 December 2023 |
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TH3B3 |
Transverse Gradient Undulator for a Storage Ring X-Ray Free-Electron Laser Oscillator |
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- Y.S. Li
University of Chicago, Chicago, Illinois, USA
- K.-J. Kimpresenter, R.R. Lindberg
ANL, Lemont, Illinois, USA
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Funding: This work is supported by the U.S. Department of Energy, Office of Science under Contract No. DE-AC02-06CH11357
The X-ray free-electron laser oscillator (XFELO) has the potential to greatly surpass current SASE-FELs in terms of peak power and photon coherence. Although a large, 4th generation storage ring (4GSR) is promising as a diver for an XFELO operation, meeting the requisite electron energy spread remains a challenge. The transverse gradient undulator (TGU) is a potential solution to this issue*. Using low-gain TGU theory, we derive optimal beam parameters for a hypothetical XFELO in a straight section of PETRA-IV and discuss potential implementation challenges associated with the ring-FEL coupling, namely FEL beam degradation and gain modulation. The need for a by-pass and fast kickers is obviated by equipping a higher charge (4 nC) to sixteen equidistant electron bunches for XFELO interaction. RF is used to control the FEL duty cycle and allow the XFELO bunches to damp before resuming the FEL interaction. Detailed multi-stage numerical simulation was used to compute the projected performance**.
* T. I. Smith, L. R. Elias, J. M. J. Madey, and D. A. G. Deacon, J. Appl. Phys. 50, 4580 (1979).
** Y. S. Li, R. R. Lindberg, and K.-J. Kim, Phys. Rev. AB 26, p. 030702 (2023).
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Slides TH3B3 [3.213 MB]
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TH3B4 |
Generation of Multi X-Ray Pulses with Tunable Separation in Electron Storage Rings |
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- H.S. Xu, N. Wang, J.Y. Xu
IHEP, Beijing, People’s Republic of China
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Synchrotron light sources, which can provide high brightness X-ray pulses to different users simultaneously, are demonstrated as a kind of very powerful tool for scientific research in many areas. Among the possible applications of synchrotron light sources, time resolved experiments are interesting for many users and usually require special operation modes. However, the time structures of X-ray pulses generated by a synchrotron light source are usually limited to integer times of the RF period, which is typically several nanoseconds (e.g., 2 ns RF period time corresponding to 500 MHz RF frequency). Here, we propose a novel scheme to take advantage of transverse deflecting cavities and over-stretching conditions of the higher harmonic cavities to ensure the transverse and longitudinal tunability of the twoμbunches in the same RF bucket. By applying this scheme, two X-ray pulses with tunable transverse displacement (mm level) and time delay (hundreds of ps level) can be provided to the scientific users for their X-ray pump X-ray probe experiments or X-ray probe X-ray probe experiments. The key setting parameters to generate the two X-ray pulses are given here. The classical "single-bunch" instabilities under the over-stretching conditions were also studied and presented.
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Slides TH3B4 [4.975 MB]
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