Phys. Rev. ST Accel. Beams 7, 090702 (2004) [6 pages]Emittance compensation in a superconducting rf gun with a magnetic mode
K. Flöttmann1, D. Janssen2 *, and V. Volkov3 See Also: Publisher's Note Received 3 June 2004; published 22 September 2004; corrected 24 September 2004 External fields are necessary for emittance compensation and beam focusing in rf photoelectron guns. For rf guns with superconducting cavities two fields have been discussed up to now. The first field is a specially designed radial component of the rf field immediately after the cathode and the second is a static magnetic field downstream of the superconducting cavity. In this paper we discuss a third possibility. Inside the cavity the magnetic rf field of a TE mode focuses the electron beam and prevents the increase of the transverse emittance. The results depend only weakly on the phase of the TE mode. For a bunch charge of 1 nC, an emittance of 0.7 mm mrad has been obtained with a surface field strength of the magnetic field below the quench limit. ©2004 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevSTAB.7.090702 * Corresponding author. Electronic address: janssen@fz-rossendorf.de See AlsoPublisher's Note: K. Flöttmann, D. Janssen, and V. Volkov, Publisher's Note: Emittance compensation in a superconducting rf gun with a magnetic mode [Phys. Rev. ST Accel. Beams 7, 090702 (2004)], Phys. Rev. ST Accel. Beams 7, 099901 (2004) [ Abstract | Previous article | Next article | Issue 9 ] |
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