Non-linear beam dynamics in an RFQ under 3D space charge and image charge effects

AbstractHigh-intensity electron linacs have severe space-charge effects that lead to the production of beam halo which degrade the beam quality. For a given charge per bunch, hollow beams have a weaker nonlinear space-charge force. In this paper, we have investigated the possibility of using hollow beam to control halo growth in linacs. We simulate the dynamics of such a beam in a 17 MeV radio frequency linac using ASTRA beam dynamics code and show that it experiences a smaller emittance growth as well as reduced beam halo. The results suggest that using a hollow beam, high charge per bunch could be propagated and accelerated in a radio frequency linac.

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DESIGN OF A 2 kA, 30 fs RF-PHOTOINJECTOR FOR WATERBAG COMPRESSION

International Journal of Modern Physics A ◽

10.1142/s0217751x07037573 ◽

2007 ◽

Vol 22 (22) ◽

pp. 4000-4005 ◽

Cited By ~ 2

Author(s):

S. B. VAN DER GEER ◽

O. J. LUITEN ◽

M. J. DE LOOS

Keyword(s):

Space Charge ◽

Half Cell ◽

Charge Effects ◽

High Brightness ◽

Electron Bunches ◽

3D Space ◽

Rf Photoinjector ◽

Booster Compressor ◽

Set Up ◽

Ballistic Bunching

Because uniformly filled ellipsoidal ‘waterbag’ bunches have linear self-fields in all dimensions, they do not suffer from space-charge induced brightness degradation. This in turn allows very efficient longitudinal compression of high-brightness bunches at sub or mildly relativistic energies, a parameter regime inaccessible up to now due to detrimental effects of non-linear space-charge forces. To demonstrate the feasibility of this approach, we investigate ballistic bunching of 1 MeV, 100 pC waterbag electron bunches, created in a half-cell rf-photogun, by means of a two-cell booster-compressor. Detailed GPT simulations of this table-top set-up are presented, including realistic fields, 3D space-charge effects, path-length differences and image charges at the cathode. It is shown that with a single 10MW S-band klystron and fields of 100 MV/m, 2kA peak current is attainable with a pulse duration of only 30 fs at a transverse normalized emittance of 1.5 μm.

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Formulation of Non-Linear Free Electron Laser Dynamics with Space Charge Effects and Spatially Varying Wiggler

1979 International Conference on Submillimeter Waves and Their Applications ◽

10.1109/icswa.1979.9335369 ◽

1979 ◽

Author(s):

P. Sprangle ◽

Cha-Mei Tang

Keyword(s):

Space Charge ◽

Free Electron ◽

Free Electron Laser ◽

Space Charge Effects ◽

Charge Effects ◽

Laser Dynamics ◽

Non Linear ◽

Spatially Varying

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Space charge effects in confined ceramic systems

International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde) ◽

10.3139/146.101596 ◽

2008 ◽

Vol 99 (1) ◽

pp. 24-25 ◽

Cited By ~ 2

Author(s):

Joachim Maier

Keyword(s):

Space Charge ◽

Space Charge Effects ◽

Charge Effects

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Space Charge Effects in Noble-Liquid Calorimeters and Time Projection Chambers

Instruments ◽

10.3390/instruments5010009 ◽

2021 ◽

Vol 5 (1) ◽

pp. 9

Author(s):

Sandro Palestini

Keyword(s):

Space Charge ◽

Scaling Laws ◽

Relative Size ◽

Design Solution ◽

Space Charge Effects ◽

Charge Effects ◽

Time Projection Chambers ◽

Drift Length ◽

Calibration Methods ◽

Time Projection

The subject of space charge in ionization detectors is reviewed, showing how the observations and the formalism used to describe the effects have evolved, starting with applications to calorimeters and reaching recent, large time-projection chambers. General scaling laws, and different ways to present and model the effects are presented. The relations between space-charge effects and the boundary conditions imposed on the side faces of the detector are discussed, together with a design solution that mitigates some of the effects. The implications of the relative size of drift length and transverse detector size are illustrated. Calibration methods are briefly discussed.

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