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Non-perturbative measurement of low-intensity charged particle beams

Non-perturbative measurements of low-intensity charged particle beams are particularly challenging to beam diagnostics due to the low amplitude of the induced electromagnetic fields. In the low-energy antiproton decelerator (AD) and the future extra low energy antiproton rings at CERN, an absolute m...

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Autores principales: Fernandes, M, Geithner, R, Golm, J, Neubert, R, Schwickert, M, Stöhlker, T, Tan, J, Welsch, C P
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:https://dx.doi.org/10.1088/0953-2048/30/1/015001
http://cds.cern.ch/record/2276764
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author Fernandes, M
Geithner, R
Golm, J
Neubert, R
Schwickert, M
Stöhlker, T
Tan, J
Welsch, C P
author_facet Fernandes, M
Geithner, R
Golm, J
Neubert, R
Schwickert, M
Stöhlker, T
Tan, J
Welsch, C P
author_sort Fernandes, M
collection CERN
description Non-perturbative measurements of low-intensity charged particle beams are particularly challenging to beam diagnostics due to the low amplitude of the induced electromagnetic fields. In the low-energy antiproton decelerator (AD) and the future extra low energy antiproton rings at CERN, an absolute measurement of the beam intensity is essential to monitor the operation efficiency. Superconducting quantum interference device (SQUID) based cryogenic current comparators (CCC) have been used for measuring slow charged beams in the nA range, showing a very good current resolution. But these were unable to measure fast bunched beams, due to the slew-rate limitation of SQUID devices and presented a strong susceptibility to external perturbations. Here, we present a CCC system developed for the AD machine, which was optimised in terms of its current resolution, system stability, ability to cope with short bunched beams, and immunity to mechanical vibrations. This paper presents the monitor design and the first results from measurements with a low energy antiproton beam obtained in the AD in 2015. These are the first CCC beam current measurements ever performed in a synchrotron machine with both coasting and short bunched beams. It is shown that the system is able to stably measure the AD beam throughout the entire cycle, with a current resolution of 30 {nA}.
id oai-inspirehep.net-1609600
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
record_format invenio
spelling oai-inspirehep.net-16096002019-09-30T06:29:59Zdoi:10.1088/0953-2048/30/1/015001http://cds.cern.ch/record/2276764engFernandes, MGeithner, RGolm, JNeubert, RSchwickert, MStöhlker, TTan, JWelsch, C PNon-perturbative measurement of low-intensity charged particle beamsAccelerators and Storage RingsNon-perturbative measurements of low-intensity charged particle beams are particularly challenging to beam diagnostics due to the low amplitude of the induced electromagnetic fields. In the low-energy antiproton decelerator (AD) and the future extra low energy antiproton rings at CERN, an absolute measurement of the beam intensity is essential to monitor the operation efficiency. Superconducting quantum interference device (SQUID) based cryogenic current comparators (CCC) have been used for measuring slow charged beams in the nA range, showing a very good current resolution. But these were unable to measure fast bunched beams, due to the slew-rate limitation of SQUID devices and presented a strong susceptibility to external perturbations. Here, we present a CCC system developed for the AD machine, which was optimised in terms of its current resolution, system stability, ability to cope with short bunched beams, and immunity to mechanical vibrations. This paper presents the monitor design and the first results from measurements with a low energy antiproton beam obtained in the AD in 2015. These are the first CCC beam current measurements ever performed in a synchrotron machine with both coasting and short bunched beams. It is shown that the system is able to stably measure the AD beam throughout the entire cycle, with a current resolution of 30 {nA}.oai:inspirehep.net:16096002017
spellingShingle Accelerators and Storage Rings
Fernandes, M
Geithner, R
Golm, J
Neubert, R
Schwickert, M
Stöhlker, T
Tan, J
Welsch, C P
Non-perturbative measurement of low-intensity charged particle beams
title Non-perturbative measurement of low-intensity charged particle beams
title_full Non-perturbative measurement of low-intensity charged particle beams
title_fullStr Non-perturbative measurement of low-intensity charged particle beams
title_full_unstemmed Non-perturbative measurement of low-intensity charged particle beams
title_short Non-perturbative measurement of low-intensity charged particle beams
title_sort non-perturbative measurement of low-intensity charged particle beams
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1088/0953-2048/30/1/015001
http://cds.cern.ch/record/2276764
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AT neubertr nonperturbativemeasurementoflowintensitychargedparticlebeams
AT schwickertm nonperturbativemeasurementoflowintensitychargedparticlebeams
AT stohlkert nonperturbativemeasurementoflowintensitychargedparticlebeams
AT tanj nonperturbativemeasurementoflowintensitychargedparticlebeams
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