Liner radius fluctuations in a high-gain Cherenkov free-electron laser

M.I. de la Fuente Valentin, Petrus J.M. van der Slot, Klaus J. Boller

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Abstract

Phase shifts in the propagating electromagnetic field of a Cherenkov free-electron laser (CFEL) can affect its gain. The phase velocity of an electromagnetic wave varies, for example, when the lined waveguide is inhomogeneous along its length. In this paper, we study quantitatively the saturated power of a particular CFEL at both weak and strong electron-beam pumping when the inner radius of the liner contains fluctuations along the waveguide. We show that the gain bandwidth of the CFEL is substantially broadened when the CFEL is pumped with a high-current beam. We also show that the design of a CFEL needs to include optimization with respect to sensitivity to liner fluctuations, especially for weakly pumped CFELs, that is, CFELs that use a low-current electron-beam density. This optimization can be relaxed for more strongly pumped CFELs.
Original languageUndefined
Pages (from-to)020702-1-020702-7
Number of pages7
JournalPhysical review special topics : Accelerators and beams
Volume10
Issue number020702
DOIs
Publication statusPublished - 2007

Keywords

  • IR-57942
  • METIS-238869

Cite this

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title = "Liner radius fluctuations in a high-gain Cherenkov free-electron laser",
abstract = "Phase shifts in the propagating electromagnetic field of a Cherenkov free-electron laser (CFEL) can affect its gain. The phase velocity of an electromagnetic wave varies, for example, when the lined waveguide is inhomogeneous along its length. In this paper, we study quantitatively the saturated power of a particular CFEL at both weak and strong electron-beam pumping when the inner radius of the liner contains fluctuations along the waveguide. We show that the gain bandwidth of the CFEL is substantially broadened when the CFEL is pumped with a high-current beam. We also show that the design of a CFEL needs to include optimization with respect to sensitivity to liner fluctuations, especially for weakly pumped CFELs, that is, CFELs that use a low-current electron-beam density. This optimization can be relaxed for more strongly pumped CFELs.",
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year = "2007",
doi = "10.1103/PhysRevSTAB.10.020702",
language = "Undefined",
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journal = "Physical review special topics : Accelerators and beams",
issn = "1098-4402",
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Liner radius fluctuations in a high-gain Cherenkov free-electron laser. / de la Fuente Valentin, M.I.; van der Slot, Petrus J.M.; Boller, Klaus J.

In: Physical review special topics : Accelerators and beams, Vol. 10, No. 020702, 2007, p. 020702-1-020702-7.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Liner radius fluctuations in a high-gain Cherenkov free-electron laser

AU - de la Fuente Valentin, M.I.

AU - van der Slot, Petrus J.M.

AU - Boller, Klaus J.

PY - 2007

Y1 - 2007

N2 - Phase shifts in the propagating electromagnetic field of a Cherenkov free-electron laser (CFEL) can affect its gain. The phase velocity of an electromagnetic wave varies, for example, when the lined waveguide is inhomogeneous along its length. In this paper, we study quantitatively the saturated power of a particular CFEL at both weak and strong electron-beam pumping when the inner radius of the liner contains fluctuations along the waveguide. We show that the gain bandwidth of the CFEL is substantially broadened when the CFEL is pumped with a high-current beam. We also show that the design of a CFEL needs to include optimization with respect to sensitivity to liner fluctuations, especially for weakly pumped CFELs, that is, CFELs that use a low-current electron-beam density. This optimization can be relaxed for more strongly pumped CFELs.

AB - Phase shifts in the propagating electromagnetic field of a Cherenkov free-electron laser (CFEL) can affect its gain. The phase velocity of an electromagnetic wave varies, for example, when the lined waveguide is inhomogeneous along its length. In this paper, we study quantitatively the saturated power of a particular CFEL at both weak and strong electron-beam pumping when the inner radius of the liner contains fluctuations along the waveguide. We show that the gain bandwidth of the CFEL is substantially broadened when the CFEL is pumped with a high-current beam. We also show that the design of a CFEL needs to include optimization with respect to sensitivity to liner fluctuations, especially for weakly pumped CFELs, that is, CFELs that use a low-current electron-beam density. This optimization can be relaxed for more strongly pumped CFELs.

KW - IR-57942

KW - METIS-238869

U2 - 10.1103/PhysRevSTAB.10.020702

DO - 10.1103/PhysRevSTAB.10.020702

M3 - Article

VL - 10

SP - 020702-1-020702-7

JO - Physical review special topics : Accelerators and beams

JF - Physical review special topics : Accelerators and beams

SN - 1098-4402

IS - 020702

ER -