Experimental Evidence of Space Charge Driven Emittance Coupling in High Intensity Linear Accelerators

Journal Article · Fri Nov 27 00:00:00 EST 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.103.224801· OSTI ID:21370867

Groening, L; Hofmann, I; Barth, W; Bayer, W; Clemente, G; Dahl, L; Forck, P; Gerhard, P; Kaiser, M S; Maier, M; Mickat, S; Milosic, T; Yaramyshev, S; Uriot, D ^[1]

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1. GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, Planckstrasse 1, D-64291 Darmstadt (Germany)

In high intensity linacs emittance exchange driven by space charge coupling may lead to the well-known 'equipartitioning' phenomenon if the stop band at sigma{sub ||}=sigma{sub perpendicular} is crossed at sufficiently slow rate. This Letter is the first experimental evidence of this phenomenon in a high intensity linear accelerator, here the UNILAC at GSI. Measurements of emittances at the entrance and exit of one drift tube linac tank comprising 15 lattice cells are taken for a set of transverse and longitudinal tunes. The onset of exchange on the stop band of previously derived 'stability charts' confirms theoretical predictions. The measured transverse emittance growth also compares well with results from the beam dynamics simulation codes DYNAMION and TRACEWIN.

• OSTI ID: 21370867
• Journal Information: Physical Review Letters, Vol. 103, Issue 22; Other Information: DOI: 10.1103/PhysRevLett.103.224801; (c) 2009 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM DYNAMICS
DRIFT TUBES
SIMULATION
SPACE CHARGE
STABILITY
UNILAC
ACCELERATORS
DYNAMICS
HEAVY ION ACCELERATORS
LINEAR ACCELERATORS
MECHANICS