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A critical study of emittance measurements of intense low-energy proton beams
The measurement of emittance in low energy proton beams suffers from two perturbing effects: 1) the neutralisation of the beam by backstreaming secondary electrons and 2) the space charge blowup of the beam sample between defining and analysing apparatus. An experimental study shows a significant ch...
Autores principales: | , |
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Lenguaje: | eng |
Publicado: |
1972
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/0029-554X(72)90296-0 http://cds.cern.ch/record/875601 |
Sumario: | The measurement of emittance in low energy proton beams suffers from two perturbing effects: 1) the neutralisation of the beam by backstreaming secondary electrons and 2) the space charge blowup of the beam sample between defining and analysing apparatus. An experimental study shows a significant change of the emittance orientation when bias is used to eliminate the secondary electrons. Biased and non-biased cases are also compared with computed dynamics including space charge. Criteria for the slit size and drift distance which make the space charge blow-up negligible are derived. In addition a transverse coherent oscillation of the proton beam, which was revealed the measurements, is discussed briefly. (11 refs). |
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