A high-brightness SRF photoelectron injector for FEL light sources

Arnold, A.; Büttig, H.; Janssen, D.; Kamps, T.; Klemz, G.; Lehmann, W.D.; Lehnert, U.; Lipka, D.; Marhauser, Frank; Michel, P.; Möller, K.; Murcek, Petr; Schneider, C.; Schurig, R.; Staufenbiel, F.; Stephan, J.; Teichert, J.; Volkov, Vladimir; Will, I.; Xiang, Rong

doi:10.1016/j.nima.2008.04.035

Cited by 22 publications

(14 citation statements)

References 6 publications

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“…A typical source of electrons in experiments such as these is from a linac. In our simulations we will model the electron beam as being 10µm in diameter, which is typical of facilities such as the ELBE accelerator at the Forschungszentrum Dresden-Rossendorf in Germany [30]. We will assume the beam to be of a high quality with negligible energy spread (e.g.…”

Section: B Gaussian Beam Dynamicsmentioning

confidence: 99%

Radiation damping in pulsed Gaussian beams

Harvey

Marklund

2012

Phys. Rev. A

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We consider the effects of radiation damping on the electron dynamics in a Gaussian beam model of a laser field. For high intensities, i.e. with dimensionless intensity a 0 1, it is found that the dynamics divide into three regimes. For low energy electrons (low initial γ-factor, γ 0 ) the radiation damping effects are negligible. At higher energies, but still at 2γ 0 < a 0 , the damping alters the final displacement and the net energy change of the electron. For 2γ 0 > a 0 one is in a regime of radiation reaction induced electron capture. This capture is found to be stable with respect to the spatial properties of the electron beam and results in a significant energy loss of the electrons. In this regime the plane wave model of the laser field provides a good description of the dynamics, whereas for lower energies the Gaussian beam and plane wave models differ significantly. Finally the dynamics are considered for the case of an XFEL field. It is found that the significantly lower intensities of such fields inhibits the damping effects.

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Section: B Gaussian Beam Dynamicsmentioning

confidence: 99%

Radiation damping in pulsed Gaussian beams

Harvey

Marklund

2012

Phys. Rev. A

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“…On this issue, initial results with Cs 2 Te photocathodes in a SRF gun have shown promising results [13].…”

Section: Superconducting Rf Gunsmentioning

confidence: 99%

“…Schemes under study include those where the required solenoidal magnetic field configuration is generated by exciting a particular high-order mode in one of the gun accelerating-cells [13], or where cryo-compatible solenoids are housed inside the cryostat.…”

Section: Superconducting Rf Gunsmentioning

confidence: 99%

“…It is important to note that injectors and electron guns capable of operating at high repetition rates with equi-spaced bunches and the required high 6D brightness (particle density in the 6D phase space), do not yet exist. Consequently, an intense R&D effort by a number of groups around the world has been devoted to development of injectors capable of such performance [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Schemes and challenges for electron injectors operating in high repetition rate X-ray FELs

Sannibale

Filippetto

Papadopoulos

2011

Journal of Modern Optics

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Requirements and challenges for high-brightness electron injectors operating in a high-repetition-rate X-ray FEL are described. Schemes presently under development or study are reviewed, and their advantages and limitations are compared. Beam dynamics and engineering/technological aspects are addressed, with a particular emphasis placed on how the high-repetition-rate requirement impacts the choice of cathodes and of gun/accelerator technologies, and on how those choices consequently impact beam dynamics.

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“…In recent years, superconducting rf photoinjectors (SRF gun) have drawn a lot of attention because of their characters: continuous-wave (cw) operation, flexible bunch structures, low emittance compared to the other high average current sources [5] and the potential application for polarized beam generation [6]. The ELBE SRF gun within the cooperation of HZDR, HZB, DESY and MBI has been successfully commissioned [7,8] and firstly operated for the ELBE IR-FEL [9]. It is operated at a peak field E z: max of up to 16.2 MV=m at cw mode and 21.6 MV=m at macropulse mode.…”

Section: Introductionmentioning

confidence: 99%

Experimental studies of dark current in a superconducting rf photoinjector

Xiang

Arnold

Kamps

et al. 2014

Phys. Rev. ST Accel. Beams

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A superconducting rf photoinjector (SRF gun) has been put in operation successfully at the radiation source ELBE. It produces a 13 MHz, low emittance, cw beam with beam current up to 400 μA and energy of 3 MeV. During the gun operation, the field emission from the niobium cavity and the Cs 2 Te cathodes produces dark current. In this paper, we study the dark current of the SRF gun by using the existing diagnostics beam line. The dependency of the intensity and the energy spectrum on the cavity gradient and the cathode voltage are examined, and the emission sources are analyzed. Furthermore, the new project of installing a strip line kicker to reduce the dark current effect is presented.

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A high-brightness SRF photoelectron injector for FEL light sources

Cited by 22 publications

References 6 publications

Radiation damping in pulsed Gaussian beams

Radiation damping in pulsed Gaussian beams

Schemes and challenges for electron injectors operating in high repetition rate X-ray FELs

Experimental studies of dark current in a superconducting rf photoinjector

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