Experimental Evidence of the 90° Stop Band in the GSI UNILAC

被引：34

作者：

Groening, L. ^{[1
]}

Barth, W. ^{[1
]}

Bayer, W. ^{[1
]}

Clemente, G. ^{[1
]}

Dahl, L. ^{[1
]}

Forck, P. ^{[1
]}

Gerhard, P. ^{[1
]}

Hofmann, I. ^{[1
]}

Kaiser, M. S. ^{[1
]}

Maier, M. ^{[1
]}

Mickat, S. ^{[1
]}

Milosic, T. ^{[1
]}

Jeon, D. ^{[2
]}

Uriot, D. ^{[3
]}

机构：

[1] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[2] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA

[3] CEA, IRFU, Serv Accelerateurs Cryogenie & Magnetisme, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 23期

关键词：

EMITTANCE GROWTH; RINGS;

D O I：

10.1103/PhysRevLett.102.234801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In a particle accelerator with a periodic structure beam space charge force may excite resonant beam emittance growth if the particle's transverse phase advance approaches 90 degrees. A recent simulation study with the PARMILA code [D. Jeon et al., Phys. Rev. ST Accel. Beams 12, 054204 (2009)] has shown the feasibility of measuring the stop band of this fourth order resonance in the GSI Universal Linear Accelerator UNILAC and proposed its experimental verification, which is reported here. Measurements of transverse phase space distributions behind a periodically focusing structure reveal a fourfold symmetry characteristic of fourth order resonances as well as a resonance stop band above sigma(0) = 90 degrees per focusing cell. These experimental findings agree with results from three different beam dynamics simulation codes, i.e., DYNAMION, PARMILA, and TRACEWIN.

引用

页数：4

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