skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Two-Channel Rectangular Dielectric Wake Field Accelerator Structure Experiment

Abstract

A design is presented for a two-channel 30-GHz rectangular dielectric wake field accelerator structure being built for experimental tests at Argonne National Laboratory (ANL). This structure allows for a transformer ratio T much greater than two, and permits continuous coupling of energy from drive bunches to accelerated bunches. It consists of three planar slabs of cordierite ceramic ({epsilon} = 4.7) supported within a rectangular copper block, forming a drive channel 12 mmx6 mm, and an accelerator channel 2 mmx6 mm. When driven by a 50 nC, 14 MeV single bunch available at ANL, theory predicts an acceleration field of 6 MeV/m, and T = 12.6. Inherent transverse wake forces introduce deflections and some distortion of bunch profiles during transit through the structure that are estimated to be tolerable. Additionally, a cylindrical two-channel DWFA is introduced which shares many advantages of the rectangular structure including high T, and the added virtue of axisymmetry that eliminates lowest-order transverse deflecting forces.

Authors:
 [1];  [2];  [1];  [3];  [4];  [5];  [6];  [3]
  1. Omega-P, Inc., New Haven Connecticut (United States)
  2. (Ukraine)
  3. (United States)
  4. Yale University, New Haven, Connecticut (United States)
  5. Fermi National Accelerator Laboratory, Batavia, IL (United States)
  6. NSC Kharkov Institute of Physics and Technology, Kharkov (Ukraine)
Publication Date:
OSTI Identifier:
21255257
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1086; Journal Issue: 1; Conference: 13. advanced accelerator concepts workshop, Santa Cruz, CA (United States), 27 Jul - 2 Aug 2008; Other Information: DOI: 10.1063/1.3080943; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATION; ANL; CERAMICS; COPPER; CYLINDRICAL CONFIGURATION; DIELECTRIC MATERIALS; GHZ RANGE 01-100; MEV RANGE 01-10; MEV RANGE 10-100; SLABS; TRANSFORMERS; WAKEFIELD ACCELERATORS; WAVEGUIDES

Citation Formats

Sotnikov, G. V., NSC Kharkov Institute of Physics and Technology, Kharkov, Marshall, T. C., Columbia University, New York, New York, Shchelkunov, S. V., Didenko, A., Hirshfield, J. L., and Yale University, New Haven, Connecticut. Two-Channel Rectangular Dielectric Wake Field Accelerator Structure Experiment. United States: N. p., 2009. Web. doi:10.1063/1.3080943.
Sotnikov, G. V., NSC Kharkov Institute of Physics and Technology, Kharkov, Marshall, T. C., Columbia University, New York, New York, Shchelkunov, S. V., Didenko, A., Hirshfield, J. L., & Yale University, New Haven, Connecticut. Two-Channel Rectangular Dielectric Wake Field Accelerator Structure Experiment. United States. doi:10.1063/1.3080943.
Sotnikov, G. V., NSC Kharkov Institute of Physics and Technology, Kharkov, Marshall, T. C., Columbia University, New York, New York, Shchelkunov, S. V., Didenko, A., Hirshfield, J. L., and Yale University, New Haven, Connecticut. 2009. "Two-Channel Rectangular Dielectric Wake Field Accelerator Structure Experiment". United States. doi:10.1063/1.3080943.
@article{osti_21255257,
title = {Two-Channel Rectangular Dielectric Wake Field Accelerator Structure Experiment},
author = {Sotnikov, G. V. and NSC Kharkov Institute of Physics and Technology, Kharkov and Marshall, T. C. and Columbia University, New York, New York and Shchelkunov, S. V. and Didenko, A. and Hirshfield, J. L. and Yale University, New Haven, Connecticut},
abstractNote = {A design is presented for a two-channel 30-GHz rectangular dielectric wake field accelerator structure being built for experimental tests at Argonne National Laboratory (ANL). This structure allows for a transformer ratio T much greater than two, and permits continuous coupling of energy from drive bunches to accelerated bunches. It consists of three planar slabs of cordierite ceramic ({epsilon} = 4.7) supported within a rectangular copper block, forming a drive channel 12 mmx6 mm, and an accelerator channel 2 mmx6 mm. When driven by a 50 nC, 14 MeV single bunch available at ANL, theory predicts an acceleration field of 6 MeV/m, and T = 12.6. Inherent transverse wake forces introduce deflections and some distortion of bunch profiles during transit through the structure that are estimated to be tolerable. Additionally, a cylindrical two-channel DWFA is introduced which shares many advantages of the rectangular structure including high T, and the added virtue of axisymmetry that eliminates lowest-order transverse deflecting forces.},
doi = {10.1063/1.3080943},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1086,
place = {United States},
year = 2009,
month = 1
}
  • Current status of a two-channel cm-scale rectangular dielectric lined wakefield accelerator structure is described. This structure is installed at the Argonne Wakefield Accelerator facility (AWA), and is presently being evaluated. The device has a transformer ratio of {approx}12.5:1. When driven by a {approx}50 nC single drive bunch it is expected to obtain {approx}6 MV/m acceleration gradient. Related issues are discussed.
  • We describe a multi-bunch wake-field accelerator in an annular, cylindrical dielectric structure in which many modes can participate in the wake-field formation, and where the wake-field period equals the period of a train of drive bunches of electrons. The structure can be designed so that the TM{sub 0n} modes, all with phase velocities equal to the bunch velocity, have nearly equally-spaced eigenfrequencies, and thus interfere constructively. The composite wake-field is shown to cause highly peaked axial electric fields localized on each driving bunch in a periodic sequence of bunches. This permits stimulated emission of wake-field energy to occur at amore » rate that is larger than the coherent spontaneous emission from a single driving bunch having the same total charge. We present calculations for an annular alumina structure which will use 2 nC bunches of electrons obtained from a 100 MeV rf linac operating at 11.4 Ghz. Numerical examples are given, including acceleration of a test bunch to {gt}200 MeV in a structure 75 cm long, using three drive bunches. {copyright} {ital 1999 American Institute of Physics.}« less
  • We describe a multi-bunch wake-field accelerator in an annular, cylindrical dielectric structure in which many modes can participate in the wake-field formation, and where the wake-field period equals the period of a train of drive bunches of electrons. The structure can be designed so that the TM{sub 0n} modes, all with phase velocities equal to the bunch velocity, have nearly equally-spaced eigenfrequencies, and thus interfere constructively. The composite wake-field is shown to cause highly peaked axial electric fields localized on each driving bunch in a periodic sequence of bunches. This permits stimulated emission of wake-field energy to occur at amore » rate that is larger than the coherent spontaneous emission from a single driving bunch having the same total charge. We present calculations for an annular alumina structure which will use 2 nC bunches of electrons obtained from a 100 MeV rf linac operating at 11.4 Ghz. Numerical examples are given, including acceleration of a test bunch to >200 MeV in a structure 75 cm long, using three drive bunches.« less
  • The results of a three-dimensional analysis of wake field excitation in a slab-symmetric dielectric-loaded resonator by rigid electron bunches are presented. The complete set of solutions, including the solenoidal and potential parts of the electromagnetic field, consists of LSM and LSE modes. Each of the LSM and LSE modes contains odd and even waves. A numerical analysis of wake field excitation by symmetric electron bunches is carried out. The three-dimensional spatial structure of the longitudinal electric field is investigated. The influence of the drift vacuum channel on the wake field amplitude and on the coherent summation of wakefields for amore » regular sequence of bunches is studied.« less