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Parameter Scaling and Practical Design of TME Lattice

Description: It is a challenge to produce a practical design of an electron storage ring with a theorectical minimum emittance (TME) lattice of ultra low emittance, e.g. several pico-meters, due to the very strong focusing and extremely large natural chromaticity associated to these lattice designs. To help dealing with this challenge, it is requisite to scale the parameters and look for a best solution. In this paper, the parameter scaling is summarized, and it is argued that, with the lattice configuratio… more
Date: November 8, 2011
Creator: Jiao, Yi; Cai, Yunhai; Chao, Alex & /SLAC /Beijing, Inst. High Energy Phys. /SLAC
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Partner: UNT Libraries Government Documents Department
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FEL Gain Length and Taper Measurements at LCLS

Description: We present experimental studies of the gain length and saturation power level from 1.5 nm to 1.5 {angstrom} at the Linac Coherent Light Source (LCLS). By disrupting the FEL process with an orbit kick, we are able to measure the X-ray intensity as a function of undulator length. This kick method is cross-checked with the method of removing undulator sections. We also study the FEL-induced electron energy loss after saturation to determine the optimal taper of the undulator K values. The experime… more
Date: July 30, 2010
Creator: Ratner, Daniel; Brachmann, A.; Decker, F. J.; Ding, Y.; Dowell, D.; Emma, P. et al.
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Partner: UNT Libraries Government Documents Department
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Two-Bunch Self-Seeding for Narrow-Bandwidth Hard X-Ray Free-Electron Lasers

Description: It is well-known that seeding can be used to produce narrow-bandwidth and fully-coherent x- ray free-electron lasers. Self-seeding, which uses an extra undulator to generate the seed pulse, is perhaps one of the most promising methods to accomplish this. In the hard x-ray regime with high- energy electrons, this method requires a large magnetic chicane to match the path length delay of the x-ray monochromator that selects a narrow bandwidth of radiation. Such a chicane not only takes large foot… more
Date: June 4, 2010
Creator: Ding, Yuantao; Huang, Zhirong & Ruth, Ronald D.
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Partner: UNT Libraries Government Documents Department
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Study of High-Frequency Impedance of Small-Angle Tapers and Collimators

Description: Collimators and transitions in accelerator vacuum chambers often include small-angle tapering to lower the wakefields generated by the beam. While the low-frequency impedance is well described by Yokoya's formula (for axisymmetric geometry), much less is known about the behavior of the impedance in the high frequency limit. In this paper we develop an analytical approach to the highfrequency regime for round collimators and tapers. Our analytical results are compared with computer simulations u… more
Date: June 4, 2010
Creator: Stupakov, Gennady & Podobedov, B.
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Partner: UNT Libraries Government Documents Department
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Longitudinal Wakefield Study in SLAC Rotatable Collimator Design for the LHC Phase II Upgrade

Description: SLAC proposed a rotatable collimator design for the LHC Phase II collimation upgrade. There are 20 facet faces on each cylindrical jaw surface and two jaws are rotatable in order to introduce a clean surface in case of a beam hitting a jaw during operation. When the beam crosses the collimator, it will excite broad-band and narrow-band modes. The longitudinal modes can contribute to beam energy loss and power dissipation on the vacuum chamber wall. In this paper, the parallel finite element eig… more
Date: August 25, 2010
Creator: Xiao, Liling; Lundgren, Steven; Markiewicz, Thomas; Ng, Cho-Kuen & Smith, Jeffrey
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Partner: UNT Libraries Government Documents Department
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