Burst mode FEL with the ETA-III induction linac

Abstract

The FEL peak output power exceeded 1 GW during many Pulses of 140 GHz microwaves have been produced at a bursts. This is not as great as the highest power (=2 GW) 2 kHz rate using the ETA-III induction linac and IMP wiggler. measured during single-pulse operation [ 11. Corkscrew and The accelerator was run in bursts of up to 50 pulses at 6 MeV energy sweep of the beam during a burst remained within the and greater than 2 kA peak current. A feedback timing control acceptable range during short bursts, as evidenced by consistent system was used to synchronize acceleration voltage pulses FEL output (Fig 4). The experimental time to optimize with the electron beam, resulting in sufficient reduction of the operation was limited, so the longest recorded burst of corkscrew and energy sweep for efficient FEL operation. Peak microwaves contained slightly more than 25 pulses (Fig. 5). microwave power for short bursts was in the range 0.5-1.1 GW, which is comparable lo the single-pulse peak power II. DESCRIPTION OF THE EXPERIMENT of 0.75-2 GW [l]. FEL bursts of more than 25 pulses were obtained.