Electrons in a positive-ion beam with solenoid or quadrupole magnetic transport [electronic resource].

Published: Berkeley, Calif. : Lawrence Berkeley National Laboratory, 2007.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description: 11 : digital, PDF file
Additional Creators: Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information

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Summary

The High Current Experiment (HCX) is used to study beam transport and accumulation of electrons in quadrupole magnets and the Neutralized Drift-Compression Experiment (NDCX) to study beam transport through and accumulation of electrons in magnetic solenoids. We find that both clearing and suppressor electrodes perform as intended, enabling electron cloud densities to be minimized. Then, the measured beam envelopes in both quadrupoles and solenoids agree with simulations, indicating that theoretical beam current transport limits are reliable, in the absence of electrons. At the other extreme, reversing electrode biases with the solenoid transport effectively traps electrons; or, in quadrupole magnets, grounding the suppressor electrode allows electron emission from the end wall to flood the beam, in both cases producing significant degradation in the beam.

Report Numbers

E 1.99:lbnl-1412e
lbnl-1412e

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Note

Published through SciTech Connect.
06/04/2007.
"lbnl-1412e"
International Workshop on Electron Cloud Effects - Ecloud '07, Daegu, Korea, April 9-13, 2007.
Coleman, J.; Friedman, A.; Cohen, R.; Sharp, W.; Molvik, A.W.; Faltens, A.; Roy, P.K.; Lund, S.M.; Vay, J.L.; Seidl, P.; Bieniosek, F.; Prost, L.; Kireeff Covo, M.
Accelerator&
Fusion Research Division

Funding Information

DE-AC02-05CH11231

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