Preliminary measurements for a sub-femtosecond electron bunch length diagnostic

M.K. Weikum, G. Andonian, N.S. Sudar, M.G. Fedurin, M.N. Polyanskiy, C. Swinson, A. Ovodenko, F. O'Shea, M. Harrison, Z.M. Sheng, R. W. Assmann

Research output: Contribution to journalArticle

Abstract

With electron beam durations down to femtoseconds and sub-femtoseconds achievable in current state-of-the-art accelerators, longitudinal bunch length diagnostics with resolution at the attosecond level are required. In this paper, we present such a novel measurement device which combines a high-power laser modulator with an RF deflecting cavity in the orthogonal direction. While the laser applies a strong correlated angular modulation to a beam, the RF deflector ensures the full resolution of this streaking effect across the bunch hence recovering the temporal beam profile with sub-femtosecond resolution. Preliminary measurements to test the key components of this concept were carried out at the Accelerator Test Facility (ATF) at Brookhaven National Laboratory recently, the results of which are presented and discussed here. Moreover, a possible application of the technique for novel accelerator schemes is examined based on simulations with the particle-tracking code elegant and our beam profile reconstruction tool.

LanguageEnglish
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Early online date10 Feb 2018
DOIs
Publication statusE-pub ahead of print - 10 Feb 2018

Fingerprint

Particle accelerators
accelerators
Electrons
electrons
deflectors
High power lasers
test facilities
profiles
Test facilities
high power lasers
Modulators
modulators
Electron beams
Modulation
electron beams
modulation
cavities
Lasers
lasers
simulation

Keywords

  • bunch length diagnostic
  • laser modulator
  • longitudinal beam profile
  • RF deflecting cavity
  • sub-femtosecond resolution
  • ultrashort beam

Cite this

Weikum, M.K. ; Andonian, G. ; Sudar, N.S. ; Fedurin, M.G. ; Polyanskiy, M.N. ; Swinson, C. ; Ovodenko, A. ; O'Shea, F. ; Harrison, M. ; Sheng, Z.M. ; Assmann, R. W. / Preliminary measurements for a sub-femtosecond electron bunch length diagnostic. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2018.
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Preliminary measurements for a sub-femtosecond electron bunch length diagnostic. / Weikum, M.K.; Andonian, G.; Sudar, N.S.; Fedurin, M.G.; Polyanskiy, M.N.; Swinson, C.; Ovodenko, A.; O'Shea, F.; Harrison, M.; Sheng, Z.M.; Assmann, R. W.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.02.2018.

Research output: Contribution to journalArticle

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AU - Weikum, M.K.

AU - Andonian, G.

AU - Sudar, N.S.

AU - Fedurin, M.G.

AU - Polyanskiy, M.N.

AU - Swinson, C.

AU - Ovodenko, A.

AU - O'Shea, F.

AU - Harrison, M.

AU - Sheng, Z.M.

AU - Assmann, R. W.

PY - 2018/2/10

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N2 - With electron beam durations down to femtoseconds and sub-femtoseconds achievable in current state-of-the-art accelerators, longitudinal bunch length diagnostics with resolution at the attosecond level are required. In this paper, we present such a novel measurement device which combines a high-power laser modulator with an RF deflecting cavity in the orthogonal direction. While the laser applies a strong correlated angular modulation to a beam, the RF deflector ensures the full resolution of this streaking effect across the bunch hence recovering the temporal beam profile with sub-femtosecond resolution. Preliminary measurements to test the key components of this concept were carried out at the Accelerator Test Facility (ATF) at Brookhaven National Laboratory recently, the results of which are presented and discussed here. Moreover, a possible application of the technique for novel accelerator schemes is examined based on simulations with the particle-tracking code elegant and our beam profile reconstruction tool.

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