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Title: Measurements and simulations of wakefields at the Accelerator Test Facility 2

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1324866
Grant/Contract Number:
AC02-76SF00515; IBS-R017-D1-2016-a00; KE1870/DG/CLIC
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 19; Journal Issue: 9; Related Information: CHORUS Timestamp: 2016-09-15 18:11:15; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Snuverink, J., Ainsworth, R., Boogert, S. T., Cullinan, F. J., Lyapin, A., Kim, Y. I., Kubo, K., Kuroda, S., Okugi, T., Tauchi, T., Terunuma, N., Urakawa, J., and White, G. R. Measurements and simulations of wakefields at the Accelerator Test Facility 2. United States: N. p., 2016. Web. doi:10.1103/PhysRevAccelBeams.19.091002.
Snuverink, J., Ainsworth, R., Boogert, S. T., Cullinan, F. J., Lyapin, A., Kim, Y. I., Kubo, K., Kuroda, S., Okugi, T., Tauchi, T., Terunuma, N., Urakawa, J., & White, G. R. Measurements and simulations of wakefields at the Accelerator Test Facility 2. United States. doi:10.1103/PhysRevAccelBeams.19.091002.
Snuverink, J., Ainsworth, R., Boogert, S. T., Cullinan, F. J., Lyapin, A., Kim, Y. I., Kubo, K., Kuroda, S., Okugi, T., Tauchi, T., Terunuma, N., Urakawa, J., and White, G. R. 2016. "Measurements and simulations of wakefields at the Accelerator Test Facility 2". United States. doi:10.1103/PhysRevAccelBeams.19.091002.
@article{osti_1324866,
title = {Measurements and simulations of wakefields at the Accelerator Test Facility 2},
author = {Snuverink, J. and Ainsworth, R. and Boogert, S. T. and Cullinan, F. J. and Lyapin, A. and Kim, Y. I. and Kubo, K. and Kuroda, S. and Okugi, T. and Tauchi, T. and Terunuma, N. and Urakawa, J. and White, G. R.},
abstractNote = {},
doi = {10.1103/PhysRevAccelBeams.19.091002},
journal = {Physical Review Accelerators and Beams},
number = 9,
volume = 19,
place = {United States},
year = 2016,
month = 9
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevAccelBeams.19.091002

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  • We report on the experimental demonstration of a novel wakefield acceleration technique where a short electron bunch excites a broadband harmonic frequency spectrum, in a cylindrical dielectric structure, to synthesize an accelerating waveform. The structure is designed to have its TM{sub 0n} modes nearly equally spaced so that the modes generated by a single short electron bunch constructively interfere in the neighborhood of integral multiples of the fundamental wavelength producing large acceleration gradients. Realization of a harmonic multimode structure requires more stringent design considerations than a single-mode structure, since the permittivity and loss tangent of the material should not changemore » substantially over the bandwidth of the structure. In this experiment, a bunch train of four 5 nC electron bunches, separated by 760 ps (one net wavelength), were passed through a 60 cm long dielectric-lined cylindrical harmonic structure. Use of a train of drive bunches spaced by one wavelength reinforced the accelerating wakefield; observation of the energy loss of each bunch via a magnetic spectrometer served as a diagnostic of the wakefield. The measured energy spectrum of the four beams after passing through the waveguide was found to be in excellent agreement with the predictions of the analytic model. This result demonstrates that a dielectric can be fabricated which can synthesize the required wakefield. We also discuss potential advantages of this harmonic approach over conventional single-mode wakefield accelerators.« less
  • The ATF2 project is the final focus system prototype for the ILC and CLIC linear collider projects, with a purpose to reach a 37 nm vertical beam size at the interaction point using compact optics based on a novel scheme of local chromaticity correction. Construction of all components and installation were completed at the end of 2008. An initial commissioning phase followed in 2009, using larger than nominal {beta} functions at the interaction point, corresponding to reduced demagnification factors in comparison to the design, to limit effects from higher-order optical aberrations and hence simplify beam tuning procedures while key instrumentationmore » was being tested and calibrated. In this paper, first measurements of dispersion and Twiss parameters are presented based on scanning the beam during this period with a set of tungsten wires located just behind the interaction point, using two complementary analysis methods.« less
  • We discuss the use of 3-D finite-difference time-domain (FDTD) electromagnetic codes for the modeling of accelerator components. Computational modeling of cylindrically symmetric structures such as induction accelerator cells has been extremely successful in predicting the wake potential and wake impedances of these structures, but fully 3-D modeling of complex structures has been limited due to the substantial computer resources required for a fully 3-D model. New massively parallel 3-D time domain electromagnetic codes now under development using conforming unstructured meshes allow a substantial increase in the geometric fidelity of the structures being modeled. Development of these new codes will bemore » discussed in the context of their applicability to accelerator problems. A variety of 3-D structures are tested with an existing cubical cell FDTD code and the wake impedances are compared with simple analytic models for the structures. These results will provide a set of benchmarks for testing the new time domain codes. Structures under consideration include a stripline beam position monitor as well as circular and elliptical apertures in circular waveguides. Excellent agreement for the monopole and dipole impedances with the models are found for these structures below the cutoff frequency of the beam line. {copyright} {ital 1997 American Institute of Physics.}« less