Abstract
A non-invasive, compact laserwire system has been developed to measure the transverse emittance of an H- beam and has been demonstrated at the new LINAC4 injector for the LHC at CERN. Light from a low power, pulsed laser source is conveyed via fibre to collide with the H- beam, a fraction of which is neutralized and then intercepted by a downstream diamond detector. Scanning the focused laser across the H- beam and measuring the distribution of the photo-neutralized particles enables the transverse emittance to be reconstructed. The vertical phase-space distribution of a 3 MeV beam during LINAC4 commissioning has been measured by the laserwire and verified with a conventional slit and grid method.
Highlights
Modern proton driven accelerator applications, such as neutron spallation sources and high energy hadron colliders, demand increasingly higher beam currents
A noninvasive, compact laserwire system has been developed to measure the transverse emittance of an H− beam and has been demonstrated at the new LINAC4 injector for the LHC at CERN
A common solution is to inject H− ions via the charge exchange process, which overcomes the limit imposed by Liouville’s theorem in circular machines [1]. Such high beam currents present a challenge for conventional, invasive beam diagnostics, which may be damaged by the high beam powers
Summary
Modern proton driven accelerator applications, such as neutron spallation sources and high energy hadron colliders, demand increasingly higher beam currents. A common solution is to inject H− ions via the charge exchange process, which overcomes the limit imposed by Liouville’s theorem in circular machines [1] Such high beam currents present a challenge for conventional, invasive beam diagnostics, which may be damaged by the high beam powers. Continuous online monitoring of the beam parameters requires diagnostics that has minimal influence on the beam For this purpose, a laserwire provides an inherently indestructible and essentially noninvasive probe, that replaces the mechanical counterpart, such as a wire or slit. Since conventional invasive diagnostics are unsuited to continuous online monitoring of the LINAC4 beam, instead, the development of a noninvasive laserwire instrument was proposed [12].
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