First operation of a superconducting RF-gun

Janssen, D.; Büttig, H.; Evtushenko, P.; Freitag, Michael; Gabriel, Frank; Hartmann, B.; Lehnert, U.; Michel, P.; Möller, K.; Quast, T.; Reppe, B.; Schamlott, A.; Schneider, C.; Schurig, R.; Teichert, J.; Konstantinov, S. G.; Kruchkov, S.; Kudryavtsev, A. M.; Myskin, O. K.; Петров, В. М.; Tribendis, A.; Volkov, Vladimir; Sandner, W.; Will, I.; Matheisen, A.; Moeller, Wolf‐Dietrich; Pekeler, M.; Stein, P. vom; Haberstroh, Ch.

doi:10.1016/s0168-9002(03)00936-7

Cited by 42 publications

(11 citation statements)

References 3 publications

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“…Figure 1 shows Rossendorf SRF-gun cavity and its assembly in cryostat [3,4]. The gun consists of 3.5-cell 1.3 GHz bulk niobium cavity, a mechanism for exchanging and precise positioning of the Cs 2 Te cathode and a choke filter preventing leakage of the RF.…”

Section: Rossendorf 13 Ghz Srf-injectormentioning

confidence: 99%

Superconducting Rf Photoinjectors: An Overview

Sekutowicz

2007

Int. J. Mod. Phys. A

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R&D programs based on various approaches at AES, Beijing University, BNL, FZ-Rossendorf, JLab and DESY will lead in the near future to low emittance continuous wave (cw) operating SRF-guns, which are indispensable devices for the cw operating superconducting linacs driving FEL facilities. This contribution covers present status of these programs and progress made since the last SRF2005 Workshop at Cornell University.

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Section: Rossendorf 13 Ghz Srf-injectormentioning

confidence: 99%

Superconducting Rf Photoinjectors: An Overview

Sekutowicz

2007

Int. J. Mod. Phys. A

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“…This precludes the use of solenoid magnetic field for emittance compensation. New ideas for emittance compensation, e.g., rf focusing, higher-order magnetic modes, and external superconducting solenoid, have been proposed but thus far nC bunch charge in a single rf cycle has not been measured [11][12][13]. Another issue with SRF guns is the potential incompatibility between the multialkali cathodes and the niobium superconducting surfaces, i.e., contamination of the superconducting surfaces by the materials coming off the photocathodes.…”

Section: Introductionmentioning

confidence: 99%

End-point energy measurements of field emission current in a continuous-wave normal-conducting rf injector

Nguyen

Moody

Andrews

et al. 2011

Phys. Rev. ST Accel. Beams

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The LANL/AES normal-conducting radio-frequency injector has been tested at cw cathode gradients up to 10 MV=m. Field-emission electrons from a roughened copper cathode are accelerated to beam energy as high as 2.5 MeV and impinge on a stainless steel target. The energies of the resulting bremsstrahlung photons are measured at varying levels of injector cavity rf power corresponding to different accelerating gradients. At low cavity power, the bremsstrahlung spectra exhibit well-defined endpoint energies at the positions where the number of single-photon events decreases to one (S=N ratio ¼ 1). Increasing the cavity power raises the probability of two-photon events in which two photons simultaneously arrive at the detector and register counts at twice the photon energy. The end-point energies at high cavity power are recorded at positions where the single-photon events transition to two-photon events. The measured end-point energies using this method are in excellent agreement with PARMELA calculations based on the cavity gradients deduced from the cavity rf power measurements.

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“…A superconducting photoinjector has its own challengesprincipally, how to introduce the photocathode into the superconducting cavity. An innovative solution to this has been developed by Forschungszentrum Rossendorf [3], utilizing an RF choke joint to allow a normal conducting cathode to be used in a superconducting cavity. We explore a second option -using the superconducting wall of the cavity as a photocathode.…”

Section: Introductionmentioning

confidence: 99%

Photoemission tests of a Pb/Nb superconducting photoinjector

Smedley

Rao

Kneisel

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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We report recent progress in the development of a hybrid lead/niobium superconducting RF (SRF) photoinjector. The goal of this effort is to produce an injector with the SRF properties of a niobium cavity along with the superior quantum efficiency (QE) of a lead photocathode. Quantum efficiency measurements have been performed on an RF cavity with an electroplated lead plug as the photocathode. The effect of the laser on the RF performance of the cavity was characterized. Further measurements of the cavity RF performance are reported in these proceedings [6].

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First operation of a superconducting RF-gun

Cited by 42 publications

References 3 publications

Superconducting Rf Photoinjectors: An Overview

Superconducting Rf Photoinjectors: An Overview

End-point energy measurements of field emission current in a continuous-wave normal-conducting rf injector

Photoemission tests of a Pb/Nb superconducting photoinjector

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