CLARA conceptual design report

Clarke, Jim; Angal-Kalinin, D.; Bliss, N.; Buckley, Rachael; Buckley, Stephen; Cash, Ryan; Corlett, P.; Cowie, Louise; Cox, G.; Diakun, G.P.; Dunning, David; Fell, B.; Gallagher, A. C.; Goudket, P.; Goulden, A.; Holland, D.M.P.; Jamison, S. P.; Jones, James; Kalinin, A.; Liggins, W; Ma, Lily; Marinov, K.; Martlew, B.; McIntosh, Peter; McKenzie, Julian; Middleman, Keith; Militsyn, Boris; Moss, A.; Muratori, B.; Roper, Mark; R.N.C.Santer,; Saveliev, Y.; Snedden, Edward W.; Smith, R. J.; Smith, S. L.; Surman, M.; Thakker, Trina; Thompson, Neil; Valizadeh, Reza; Wheelhouse, Alan; Williams, Peter H.; Bartolini, R.; Martin, Ian; Barlow, R. J.; Kolano, A.; Burt, Graeme; Chattopadhyay, S; Newton, D.; Wolski, A.; Appleby, R. B.; Owen, Hywel; Serluca, M.; Xia, Guoxing; Boogert, Stewart; Lyapin, A.; Campbell, Laurence; McNeil, Brian; Paramonov, V.

doi:10.1088/1748-0221/9/05/t05001

Cited by 37 publications

(18 citation statements)

References 116 publications

(138 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The discussion need not be limited to plasma accelerators, however, and the analysis presented here is entirely general, and can be applied to any case where a larger energy chirp is anticipated. In conventional linac driven UV/x-ray FELs it is unlikely that the dispersion will be an issue at 1 GeV > , but for example at facilities used for a proof-of-principle demonstration of new FEL techniques at lower energy (e.g the proposed UK CLARA facility [31] with energy 150 250 -MeV), these effects may also be important.…”

Section: Resultsmentioning

confidence: 99%

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

Campbell

Maier

2017

New J. Phys.

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

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

Campbell

Maier

2017

New J. Phys.

View full text Add to dashboard Cite

show abstract

“…This is followed by a detailed beam quality study for an optimized 100-period dual-grating structure in terms of emittance, energy spread, and loaded accelerating gradient in Section III. Simulations were performed using beam properties of the future Compact Linear Accelerator for Research and Applications (CLARA), 22 which is a planned x-ray free electron laser (FEL) test facility to be located at the Daresbury laboratory, UK. Finally, the limitations on the electron energy gain in our simulations are also discussed.…”

Section: Introductionmentioning

confidence: 99%

Beam quality study for a grating-based dielectric laser-driven accelerator

et al. 2017

View full text Add to dashboard Cite

Dielectric laser-driven accelerators (DLAs) based on grating structures are considered to be one of the most promising technologies to reduce the size and cost of future particle accelerators. They offer high accelerating gradients of up to several GV/m in combination with mature lithographic techniques for structure fabrication. This paper numerically investigates the beam quality for acceleration of electrons in a realistic dual-grating DLA. In our simulations, we use beam parameters of the future Compact Linear Accelerator for Research and Applications facility to load an electron bunch into an optimized 100-period dual-grating structure where it interacts with a realistic laser pulse. The emittance, energy spread, and loaded accelerating gradient for modulated electrons are then analyzed in detail. Results from simulations show that an accelerating gradient of up to 1.13 ± 0.15 GV/m with an extremely small emittance growth, 3.6%, can be expected.

show abstract

“…Beam phase space tomography is also an established method for providing detailed information about the phase space distribution [3][4][5][6][7][8][9][10]. In this paper, we report the results of studies on CLARA FE (Compact Linear Accelerator for Research and Applications, Front End) at Daresbury Laboratory [11,12], aimed at characterising the transverse emittance and optical properties of the electron beam. The results of three different measurement techniques are compared, namely: beam-size measurements at three different locations along the beamline ("threescreen analysis"); measurement in the change of the beam size in response to the change in quadrupole strengths ("quadrupole scan"); and beam phase space tomography, with which we demonstrate for the first time reconstruction of the four-dimensional transverse phase space.…”

Section: Introductionmentioning

confidence: 99%

Transverse phase space characterization in an accelerator test facility

Wolski

Christie

Militsyn

et al. 2020

Phys. Rev. Accel. Beams

View full text Add to dashboard Cite

We compare three techniques for characterising the transverse phase space distribution of the beam in CLARA FE (the Compact Linear Accelerator for Research and Applications Front End, at Daresbury Laboratory, UK): emittance and optics measurements using screens at three separate beamline locations; quadrupole scans; and phase space tomography. We find that where the beam distribution has significant structure (as in the case of CLARA FE at the time the measurements presented here were made) tomography analysis is the most reliable way to obtain a meaningful characterisation of the transverse beam properties. We present the first experimental results from four-dimensional phase space tomography: our results show that this technique can provide an insight into beam properties that are of importance for optimising machine performance.

show abstract

CLARA conceptual design report

Cited by 37 publications

References 116 publications

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

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

Beam quality study for a grating-based dielectric laser-driven accelerator

Transverse phase space characterization in an accelerator test facility

Contact Info

Product

Resources

About