Design and applications of an X-band hybrid photoinjector

J. B. Rosenzweig, A. Valloni, D. Alesini, G. Andonian, N. Bernard, L. Faillace, L. Ficcadenti, A. Fukusawa, B. Hidding, M. Migliorati, A. Mostacci, P. Musumeci, B. Oshea, L. Palumbo, B. Spataro, A. Yakub

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

An INFN-LNF/UCLA/URLS collaboration is developing a hybrid photoinjector in X-band. This device is an integrated structure consisting of initial standing wave gun cells connected at the input coupler to a traveling wave section. This design nearly eliminates RF reflections from the SW section; further, a 90° phase shift in the accelerating field at the coupling cell gives strong velocity bunching. The current initiative in X-band follows an S-band hybrid, now proceeding to construction at LNF and high power testing/beam production measurements at UCLA. This S-band hybrid has 1.5 cell SW and 9 cell TW sections, and produces strongly compressed 3.5 MeV beam. It can be used for novel applications; here we discuss the production of an exponential energy spectrum extending from 1 to 12 MeV to simulate the effects of radiation belt environments on space-craft. It can be optionally used with a 3 m TW linac fed from RF output of the hybrid, to boost the energy to 22 MeV. While scaling the design from S-band to X-band is conceptually simple, practical limits require changes in both RF and magnetostatic designs. As the field is limited by RF breakdown to 200 MV/m peak field, the SW section must be expanded to 2.5 cells to reach 3.5 MeV; this permits flexibility in the solenoid design. We present beam dynamics simulations that show 6D phase space compensation at 7 pC: sub-0.1 mm mrad at the emittance minimum that occurs simultaneously with a longitudinal focus of <20 fs rms. We discuss applications ranging from multi-THz coherent radiation production to ultra-fast electron diffraction.

LanguageEnglish
Pages107-113
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume657
Issue number1
DOIs
Publication statusPublished - 21 Nov 2011

Fingerprint

superhigh frequencies
S band
cells
Radiation belts
Magnetostatics
Solenoids
radiation belts
Phase shift
Electron diffraction
coherent radiation
bunching
magnetostatics
solenoids
acceleration (physics)
emittance
standing waves
traveling waves
couplers
flexibility
vehicles

Keywords

  • coherent radiation
  • diffraction
  • femtosecond
  • photoinjector
  • wakefield

Cite this

Rosenzweig, J. B. ; Valloni, A. ; Alesini, D. ; Andonian, G. ; Bernard, N. ; Faillace, L. ; Ficcadenti, L. ; Fukusawa, A. ; Hidding, B. ; Migliorati, M. ; Mostacci, A. ; Musumeci, P. ; Oshea, B. ; Palumbo, L. ; Spataro, B. ; Yakub, A. / Design and applications of an X-band hybrid photoinjector. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2011 ; Vol. 657, No. 1. pp. 107-113.
@article{c698bf3afb854546a5b1411d8cb7a4de,
title = "Design and applications of an X-band hybrid photoinjector",
abstract = "An INFN-LNF/UCLA/URLS collaboration is developing a hybrid photoinjector in X-band. This device is an integrated structure consisting of initial standing wave gun cells connected at the input coupler to a traveling wave section. This design nearly eliminates RF reflections from the SW section; further, a 90° phase shift in the accelerating field at the coupling cell gives strong velocity bunching. The current initiative in X-band follows an S-band hybrid, now proceeding to construction at LNF and high power testing/beam production measurements at UCLA. This S-band hybrid has 1.5 cell SW and 9 cell TW sections, and produces strongly compressed 3.5 MeV beam. It can be used for novel applications; here we discuss the production of an exponential energy spectrum extending from 1 to 12 MeV to simulate the effects of radiation belt environments on space-craft. It can be optionally used with a 3 m TW linac fed from RF output of the hybrid, to boost the energy to 22 MeV. While scaling the design from S-band to X-band is conceptually simple, practical limits require changes in both RF and magnetostatic designs. As the field is limited by RF breakdown to 200 MV/m peak field, the SW section must be expanded to 2.5 cells to reach 3.5 MeV; this permits flexibility in the solenoid design. We present beam dynamics simulations that show 6D phase space compensation at 7 pC: sub-0.1 mm mrad at the emittance minimum that occurs simultaneously with a longitudinal focus of <20 fs rms. We discuss applications ranging from multi-THz coherent radiation production to ultra-fast electron diffraction.",
keywords = "coherent radiation, diffraction, femtosecond, photoinjector, wakefield",
author = "Rosenzweig, {J. B.} and A. Valloni and D. Alesini and G. Andonian and N. Bernard and L. Faillace and L. Ficcadenti and A. Fukusawa and B. Hidding and M. Migliorati and A. Mostacci and P. Musumeci and B. Oshea and L. Palumbo and B. Spataro and A. Yakub",
year = "2011",
month = "11",
day = "21",
doi = "10.1016/j.nima.2011.05.046",
language = "English",
volume = "657",
pages = "107--113",
journal = "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",
issn = "0168-9002",
number = "1",

}

Rosenzweig, JB, Valloni, A, Alesini, D, Andonian, G, Bernard, N, Faillace, L, Ficcadenti, L, Fukusawa, A, Hidding, B, Migliorati, M, Mostacci, A, Musumeci, P, Oshea, B, Palumbo, L, Spataro, B & Yakub, A 2011, 'Design and applications of an X-band hybrid photoinjector' Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 657, no. 1, pp. 107-113. https://doi.org/10.1016/j.nima.2011.05.046

Design and applications of an X-band hybrid photoinjector. / Rosenzweig, J. B.; Valloni, A.; Alesini, D.; Andonian, G.; Bernard, N.; Faillace, L.; Ficcadenti, L.; Fukusawa, A.; Hidding, B.; Migliorati, M.; Mostacci, A.; Musumeci, P.; Oshea, B.; Palumbo, L.; Spataro, B.; Yakub, A.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 657, No. 1, 21.11.2011, p. 107-113.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Design and applications of an X-band hybrid photoinjector

AU - Rosenzweig, J. B.

AU - Valloni, A.

AU - Alesini, D.

AU - Andonian, G.

AU - Bernard, N.

AU - Faillace, L.

AU - Ficcadenti, L.

AU - Fukusawa, A.

AU - Hidding, B.

AU - Migliorati, M.

AU - Mostacci, A.

AU - Musumeci, P.

AU - Oshea, B.

AU - Palumbo, L.

AU - Spataro, B.

AU - Yakub, A.

PY - 2011/11/21

Y1 - 2011/11/21

N2 - An INFN-LNF/UCLA/URLS collaboration is developing a hybrid photoinjector in X-band. This device is an integrated structure consisting of initial standing wave gun cells connected at the input coupler to a traveling wave section. This design nearly eliminates RF reflections from the SW section; further, a 90° phase shift in the accelerating field at the coupling cell gives strong velocity bunching. The current initiative in X-band follows an S-band hybrid, now proceeding to construction at LNF and high power testing/beam production measurements at UCLA. This S-band hybrid has 1.5 cell SW and 9 cell TW sections, and produces strongly compressed 3.5 MeV beam. It can be used for novel applications; here we discuss the production of an exponential energy spectrum extending from 1 to 12 MeV to simulate the effects of radiation belt environments on space-craft. It can be optionally used with a 3 m TW linac fed from RF output of the hybrid, to boost the energy to 22 MeV. While scaling the design from S-band to X-band is conceptually simple, practical limits require changes in both RF and magnetostatic designs. As the field is limited by RF breakdown to 200 MV/m peak field, the SW section must be expanded to 2.5 cells to reach 3.5 MeV; this permits flexibility in the solenoid design. We present beam dynamics simulations that show 6D phase space compensation at 7 pC: sub-0.1 mm mrad at the emittance minimum that occurs simultaneously with a longitudinal focus of <20 fs rms. We discuss applications ranging from multi-THz coherent radiation production to ultra-fast electron diffraction.

AB - An INFN-LNF/UCLA/URLS collaboration is developing a hybrid photoinjector in X-band. This device is an integrated structure consisting of initial standing wave gun cells connected at the input coupler to a traveling wave section. This design nearly eliminates RF reflections from the SW section; further, a 90° phase shift in the accelerating field at the coupling cell gives strong velocity bunching. The current initiative in X-band follows an S-band hybrid, now proceeding to construction at LNF and high power testing/beam production measurements at UCLA. This S-band hybrid has 1.5 cell SW and 9 cell TW sections, and produces strongly compressed 3.5 MeV beam. It can be used for novel applications; here we discuss the production of an exponential energy spectrum extending from 1 to 12 MeV to simulate the effects of radiation belt environments on space-craft. It can be optionally used with a 3 m TW linac fed from RF output of the hybrid, to boost the energy to 22 MeV. While scaling the design from S-band to X-band is conceptually simple, practical limits require changes in both RF and magnetostatic designs. As the field is limited by RF breakdown to 200 MV/m peak field, the SW section must be expanded to 2.5 cells to reach 3.5 MeV; this permits flexibility in the solenoid design. We present beam dynamics simulations that show 6D phase space compensation at 7 pC: sub-0.1 mm mrad at the emittance minimum that occurs simultaneously with a longitudinal focus of <20 fs rms. We discuss applications ranging from multi-THz coherent radiation production to ultra-fast electron diffraction.

KW - coherent radiation

KW - diffraction

KW - femtosecond

KW - photoinjector

KW - wakefield

UR - http://www.scopus.com/inward/record.url?scp=80054013009&partnerID=8YFLogxK

U2 - 10.1016/j.nima.2011.05.046

DO - 10.1016/j.nima.2011.05.046

M3 - Article

VL - 657

SP - 107

EP - 113

JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

T2 - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

SN - 0168-9002

IS - 1

ER -