Abstract
This paper shows how the MAX linac injector and transport system can be efficiently retuned to suit free electron laser (FEL) performance. In a collaboration between MAX-lab and BESSY, a seeded harmonic generation free electron laser is being constructed at MAX-lab. The setup uses the existing MAX-lab facility upgraded with a new low emittance photocathode gun, a Ti∶Sa 266 nm laser system used for both the gun and seeding and an FEL undulator system. To produce the high quality electron beam needed, it is shown how the magnet optics in an achromatic dogleg can be tuned to create an optimum bunch compression and how a good quality beam can be maintained through the beam transport and delivered to the FEL undulators. In extensive start-to-end simulations from the cathode of the gun to the generation of photons in the undulators, FEL performance and stability has been calculated using simulation tools like astra, elegant, and genesis. This has been done for both the third and fifth harmonic of the seed laser. The results from the calculation are 30 fs light pulses with a power of 11 MW at 88 nm and 1.4 MW at 53 nm. (Less)
Highlights
The creation of short, intense, and coherent radiation pulses with the development of free electron lasers is an important step for future light sources
In collaboration between the synchrotron radiation laboratory MAX-lab in Lund, Sweden and the Berliner Elektronenspeicherring Gesellschaft fur Synchrotronstrahlung (BESSY) in Berlin, Germany, a test facility for a seeded harmonic generation (HG)-free electron laser (FEL) [1] will be built over the coming year at the MAX-laboratory in Lund
The MAX injector [2] with its capabilities of up to 500 MeV electrons will be used with a new low emittance photocathode gun installed
Summary
The creation of short, intense, and coherent radiation pulses with the development of free electron lasers is an important step for future light sources. By doing start-to-end calculations [4] from the gun through the recirculator and transport to the end of the optical klystron, we will get an idea of the performance of the FEL and can optimize the whole setup on the final result, the radiation. It will give us a chance to compare the simulation results with experiments. The FEL test facility collaboration is structured such that MAX-lab provides the high quality electron beam together with a seed laser for the experiment and BESSY will construct and install the FEL undulators.
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