NDLI: Theory and design of a photoinjector-driven chirped pulse free-electron maser

Content Provider	IEEE Xplore Digital Library
Author	Le Sage, G.P. Feng, H.X.C. Laurent, L.L. Hartemann, F.V. Luhmann Jr., N.C. Fochs, S.N. Perry, M.D. Westenskow, G.A. Heritage, J.P.
Copyright Year	1973
Abstract	An overview of the design parameters of a compact high-gradient high-luminosity X-band (8.568 GHz) photoinjector is followed by a more detailed description of each of its major subsystems: X-band RF gun, GHz repetition rate synchronously modelocked AlGaAs quantum well laser oscillator, and eight-pass Ti:Al/sub 2/O/sub 3/ chirped pulse laser amplifier. The photoinjector uses a high quantum efficiency (/spl sim/5%) Cs/sub 2/Te photocathode, and is capable of producing high-charge (>1 nC) relativistic (5 MeV) ultrashort (<1 ps) electron bunches at 2.142-GHz repetition rate in burst mode (100 photoelectron bunches). Design studies indicate that a normalized rms transverse emittance /spl epsi//sub n/=0.75 /spl pi/ mm-mrad is possible at 0.1 nC charge, while 2.5 /spl pi/ mm-mrad is obtained at 1 nC. One of the most interesting applications of the photoinjector, namely the generation of ultrashort pulses of coherent synchrotron radiation, is then addressed in detail. The spectral and temporal radiation characteristics of an axially extended (finite-size) transversely accelerated charge distribution propagating on fixed helical trajectories through a wiggler are derived for a cylindrical waveguide. At grazing, where the axial bunch velocity matches the electromagnetic wave group velocity, the single output radiation pulse is extremely short, and chirped over the full interaction bandwidth; the pulse duration is determined by group velocity dispersion. A 5-MeV 1.4-nC 1-ps photoelectron bunch is then considered. The grazing frequency is adjusted to 175 GHz for the TE/sub 12/ cylindrical waveguide mode, corresponding to an 8.5-kG 30-mm-period helical wiggler. The instantaneous bandwidth of the chirped output pulse after 10 wiggler periods extends from 125 to 225 GHz. The corresponding power level is 2.2 MW, with a pulsewidth of 15 ps full width at half maximum.
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	781
Ending Page	795
Page Count	15
File Size	1772844
File Format	PDF
ISSN	00933813
Volume Number	24
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Chirp Undulators Laser modes Quantum well lasers Pulse amplifiers Tellurium Electromagnetic waveguides EMP radiation effects Bandwidth Optical design
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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