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- Title
Commissioning and validation of the injector and electron beam transport systems for the IR-FEL at RRCAT.
- Authors
Chandran, Sona; Biswas, Bhaskar; Lal, Shankar; Kumar, Arvind; Saini, R S; Khursheed, M; Gupta, Saket Kumar; Nerpagar, Pravin; Pandit, R K; Pant, K K
- Abstract
The first observation of lasing in an infra-red free electron laser (IR-FEL) at the Raja Ramanna Centre for Advanced Technology has been reported recently with a measured power output, i.e. ∼ 10 5 times higher than the expected spontaneous radiation power for the electron beam parameters used in the experiment. IR-FEL design simulations, however, estimate a power gain of 10 7 which is three orders of magnitude higher than the experimentally achieved value. To understand this difference between the measured and the expected power output from the IR-FEL, the electron beam used in the experiments has been characterised and FEL simulations have been repeated after considering the measured electron beam parameters. A reasonably good agreement is obtained between the measured results and those predicted by FEL simulations. Experiments have also been performed to study the expected variation in electron beam properties over a macropulse, which should be minimum for an oscillator FEL like the IR-FEL. This paper reports the results from the experiments for characterisation of the electron beam in the IR-FEL set-up and the results from FEL simulations, considering these measured electron beam parameters.
- Subjects
FREE electron lasers; ELECTRON beams; ELECTRON transport; INJECTORS; PLASMA beam injection heating
- Publication
Pramana: Journal of Physics, 2019, Vol 93, Issue 6, pN.PAG
- ISSN
0304-4289
- Publication type
Article
- DOI
10.1007/s12043-019-1849-5