Steady-state FEL: particle dynamics in the FEL portion of a two-beam accelerator Page: 3 of 37
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With the imminent completion of, and expected successful operation of, the
Stanford Linear Collider (SLC), accelerator physicists are planning the next
generation of linear colliders. These would seem to require a higher
accelerating gradient and a reasonably efficient use of power. One
possibility is to operate the accelerator power source at a significantly
higher frequency than the SLC (2.8 GHz), perhaps in the 30 GHz range. At the
present time no suitable power source exists at this frequency (although
considerable effort is being devoted to developing high-power sources at
frequencies above 2.8 GHz). It has been proposed that a "steady-state" FEL
could be used to power the accelerator, in a suggested configuration called a
Two-Beam Accelerator (TBA).
A schematic of a TBA is shown in Fig. 1. In this scheme a low energy,
high current electron beam is fed into a tapered wiggler module. The
generated microwave power is piped out of the FEL waveguide and is used to
power the high gradient accelerating structure. At the end of each wiggler
module, an induction unit is used to replace the electron beam energy that was
lost in the wiggler. This ideal steady-state FEL, it will be shown, could be
as long as is needed (limited in a practical design by considerations of
"filling time" of the high gradient structure and "slippage" between the high
energy bunch and the low-energy FEL beam). In this paper we examine
longitudinal effects in the FEL beam.
II. Design of Steady State FEL
A TBA has been simulated using the 1-0 FEL equations of motion in a
rectangular waveguide. All subsequent equations are for a system where the
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Sternbach, E. & Sessler, A.M. Steady-state FEL: particle dynamics in the FEL portion of a two-beam accelerator, article, September 1, 1985; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1111506/m1/3/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.