Emittance compensation in a superconducting rf gun with a magnetic mode -: art. no. 090702

被引：8

作者：

Flöttmann, K

Janssen, D

Volkov, V

机构：

[1] FZ Rossendorf, D-01314 Dresden, Germany

[2] DESY, D-2000 Hamburg, Germany

[3] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

来源：

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS | 2004年 / 7卷 / 09期

关键词：

D O I：

10.1103/PhysRevSTAB.7.090702

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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.

引用

页码：27 / 32

页数：6

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