Photoinjector-driven chirped-pulse free-electron maser

Frederic V. Hartemann; Gregory P. Le Sage; Scott N. Fochs; Helena X.C. Feng; L. L. Laurent; S. A. Rosenau; Neville C. Luhmann Jr.

doi:10.1117/12.218558

8 September 1995 Photoinjector-driven chirped-pulse free-electron maser

Frederic V. Hartemann, Gregory P. Le Sage, Scott N. Fochs, Helena X.C. Feng, L. L. Laurent, S. A. Rosenau, Neville C. Luhmann Jr.

Author Affiliations +

Proceedings Volume 2557, Intense Microwave Pulses III; (1995) https://doi.org/10.1117/12.218558
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

A compact, high repetition rate (2.142 GHz in burst mode), relativistic (5 MeV) photoinjector facility is currently under construction at the UC Davis Department of Applied Science, on the LLNL site. Photoelectron bunches are produced by irradiating a high quantum efficiency Cs₂Te photocathode with a train of 100 UV (210 nm), ultrashort (250 fs) laser pulses. These bunches are accelerated in a 1-1/2 cell, (pi) -mode, X-band rf structure energized by a 20 MW, 8.568 GHz SLAC klystron. The peak current is 0.25 kA (0.25 nC, 1 ps bunches), with a normalized emittance (epsilon) < 2.5 (pi) mm-mrad. This prebunched electron beam is then transversally accelerated in a cylindrical waveguide by a 30-mm period, 10 period long helical wiggler. The peak wiggler field is adjusted to 8.5 kG, so that the group velocity of the radiated electromagnetic waves matches the axial velocity of the electron bunch (grazing condition). Chirped pulses in excess of 2 MW power are produced with an instantaneous bandwidth extending from 125 GHz to 225 GHz, and pulse duration of 15 ps.

Citation Download Citation

Frederic V. Hartemann, Gregory P. Le Sage, Scott N. Fochs, Helena X.C. Feng, L. L. Laurent, S. A. Rosenau, and Neville C. Luhmann Jr. "Photoinjector-driven chirped-pulse free-electron maser", Proc. SPIE 2557, Intense Microwave Pulses III, (8 September 1995); https://doi.org/10.1117/12.218558

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