The FLASHForward facility at DESY

Aschikhin, Alexander; Behrens, C.; Bohlen, Simon; Dale, John; Delbos, N.; Lucchio, Laura Di; Elsen, E.; Erbe, Jan-Hendrik; Felber, M.; Foster, B.; Goldberg, Lars; Grebenyuk, J.; Gruse, Jan-Niclas; Hidding, B.; Hu, Zhanghu; Karstensen, S.; Knetsch, A.; Kononenko, Olena; Libov, V.; Ludwig, Kai; Maier, Andreas R.; Ossa, A. Martínez de la; Mehrling, Timon; Palmer, C. A. J.; Pannek, Fabian; Schaper, L.; Schlarb, H.; Schmidt, B.; Schreiber, S.; Schwinkendorf, Jan-Patrick; Steel, Harry; Streeter, Matthew; Tauscher, Gabriele; Wacker, V.; Weichert, Stefan; Wunderlich, Steffen; Zemella, Johann; Osterhoff, Jens

doi:10.1016/j.nima.2015.10.005

Cited by 58 publications

(36 citation statements)

References 37 publications

(55 reference statements)

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“…Behind the last accelerating module the beam is switched between FLASH1, which is the original undulator line, and FLASH2, which has been in operation since 2015. Also shown is sFLASH, the seeding R&D setup in FLASH1 [6] and FLASHForward [7], which is a plasma wakefield experiment in the FLASH3 beamline under construction planned to start operation at the end of 2017. FEL: free-electron laser.…”

Section: Introductionmentioning

confidence: 99%

The FLASH Facility: Advanced Options for FLASH2 and Future Perspectives

et al. 2017

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Since 2016, the two free-electron laser (FEL) lines FLASH1 and FLASH2 have been run simultaneously for users at DESY in Hamburg. With the installation of variable gap undulators in the new FLASH2 FEL line, many new possibilities have opened up in terms of photon parameters for experiments. What has been tested so far is post-saturation tapering, reverse tapering, harmonic lasing, harmonic lasing self-seeding and two-color lasing. At the moment, we are working on concepts to enhance the capabilities of the FLASH facility even further. A major part of the upgrade plans, known as FLASH2020, will involve the exchange of the fixed gap undulators in FLASH1 and the implementation of a new flexible undulator scheme aimed at providing coherent radiation for multi-color experiments over a broad wavelength range. The recent achievements in FLASH2 and the current status of plans for the further development of the facility are presented.

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Section: Introductionmentioning

confidence: 99%

The FLASH Facility: Advanced Options for FLASH2 and Future Perspectives

et al. 2017

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“…However, with the increased interest in novel accelerator concepts as FEL drivers, e.g. use of plasma accelerators [12][13][14][15] or the synthesis of broadband beams from linacs as in [16,17], the case of larger chirps has become more relevant. In this regime, dispersive effects can no longer be ignored, and the beam current and energy spread are a function of propagation distance through the undulator.…”

Section: Introductionmentioning

confidence: 99%

Velocity dispersion of correlated energy spread electron beams in the free electron laser

Campbell

Maier

2017

New J. Phys.

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The effects of a correlated linear energy/velocity chirp in the electron beam in the free electron laser (FEL), and how to compensate for its effects by using an appropriate taper (or reverse-taper) of the undulator magnetic field, is well known. The theory, as described thus far, ignores velocity dispersion from the chirp in the undulator, taking the limit of a 'small' chirp. In the following, the physics of compensating for chirp in the beam is revisited, including the effects of velocity dispersion, or beam compression or decompression, in the undulator. It is found that the limit of negligible velocity dispersion in the undulator is different from that previously identified as the small chirp limit, and is more significant than previously considered. The velocity dispersion requires a taper which is nonlinear to properly compensate for the effects of the detuning, and also results in a varying peak current (end thus a varying gain length) over the length of the undulator. The results may be especially significant for plasma driven FELs and low energy linac driven FEL test facilities.

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“…The FLASHForward experimental facility [10] is a high-performance test-bed for precision PWFA research (see Fig. 1 for a schematic of the facility).…”

Section: The Flashforward Experimental Facilitymentioning

confidence: 99%

FLASHForward: plasma wakefield accelerator science for high-average-power applications

D’Arcy

Aschikhin

Bohlen

et al. 2019

Phil. Trans. R. Soc. A.

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The FLASHForward experimental facility is a high-performance test-bed for precision plasma wakefield research, aiming to accelerate high-quality electron beams to GeV-levels in a few centimetres of ionized gas. The plasma is created by ionizing gas in a gas cell either by a high-voltage discharge or a high-intensity laser pulse. The electrons to be accelerated will either be injected internally from the plasma background or externally from the FLASH superconducting RF front end. In both cases, the wakefield will be driven by electron beams provided by the FLASH gun and linac modules operating with a 10 Hz macro-pulse structure, generating 1.25 GeV, 1 nC electron bunches at up to 3 MHz micro-pulse repetition rates. At full capacity, this FLASH bunch-train structure corresponds to 30 kW of average power, orders of magnitude higher than drivers available to other state-of-the-art LWFA and PWFA experiments. This high-power functionality means FLASHForward is the only plasma wakefield facility in the world with the immediate capability to develop, explore and benchmark high-average-power plasma wakefield research essential for next-generation facilities. The operational parameters and technical highlights of the experiment are discussed, as well as the scientific goals and high-average-power outlook. This article is part of the Theo Murphy meeting issue ‘Directions in particle beam-driven plasma wakefield acceleration’.

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The FLASHForward facility at DESY

Cited by 58 publications

References 37 publications

The FLASH Facility: Advanced Options for FLASH2 and Future Perspectives

The FLASH Facility: Advanced Options for FLASH2 and Future Perspectives

Velocity dispersion of correlated energy spread electron beams in the free electron laser

FLASHForward: plasma wakefield accelerator science for high-average-power applications

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