ON A THEORY OF AN FEL AMPLIFIER WITH CIRCULAR WAVE-GUIDE AND GUIDING MAGNETIC-FIELD

Authors
SALDIN EL SCHNEIDMILLER EA YURKOV MV
Citation
El. Saldin et al., ON A THEORY OF AN FEL AMPLIFIER WITH CIRCULAR WAVE-GUIDE AND GUIDING MAGNETIC-FIELD, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 375(1-3), 1996, pp. 241-244
Citations number
12
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
375
Issue
1-3
Year of publication
1996
Pages
241 - 244
Database
ISI
SICI code
0168-9002(1996)375:1-3<241:OATOAF>2.0.ZU;2-L
Abstract
We consider an FEL amplifier with an axisymmetric electron beam, circu lar waveguide, helical undulator and guiding magnetic field. Such an F EL amplifier configuration possesses some peculiarities when it operat es in a regime with the negative longitudinal mass (i.e. when mu(-1 pr oportional to)d upsilon(z)/dE < 0). It is shown that in the presence o f strong space charge fields, the ''negative mass'' instability signif icantly influences the FEL amplifier operation resulting in a signific ant increase in the FEL amplifier efficiency.