Journal
VACUUM
Volume 109, Issue -, Pages 417-424Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2014.07.009
Keywords
Non-invasive beam profile measurements; Beam diagnostics; Gas jet curtain
Funding
- Science and Technology Facilities Council [ST/G008248/1] Funding Source: researchfish
- STFC [ST/G008248/1] Funding Source: UKRI
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A non-invasive, gas jet-based, beam profile monitor has been developed in the QUASAR Group at the Cockcroft Institute, UK. This allows on-line measurement of the 2-dimensional transverse profile of particle beams with negligible disturbance to either primary beam or accelerator vacuum. The monitor is suitable for use with beams across a wide range of energies and intensities. In this setup a nozzle-skimmer system shapes a thin supersonic gas jet into a curtain. However, the small dimensions of the gas inlet nozzle and subsequent skimmers were shown to be the cause of many operational problems. In this paper, the dynamics of gas jet formation transport and shaping is discussed before an image-processing based alignment technique is introduced. Furthermore, experimental results obtained with a 5 keV electron beam are discussed and the effects of gas stagnation pressure on the acquired beam are presented. (C) 2014 Elsevier Ltd. All rights reserved.
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