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Real-Time Tune Measurements on the CERN Antiproton Decelerator
A novel system for real-time tune measurement during deceleration of a low-intensity particle beam is presented. The CERN Antiproton Decelerator decelerates low intensity (2x107) antiproton beams from 3.5 GeV/c to 100 MeV/c. Because of the eddy-currents in the magnets, a tune-measurement during a pa...
Autores principales: | , , , , |
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Lenguaje: | eng |
Publicado: |
2001
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Materias: | |
Acceso en línea: | http://cds.cern.ch/record/562002 |
_version_ | 1780899105205125120 |
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author | Angoletta, Maria Elena Ludwig, M Madsen, N Marqversen, O Pedersen, F |
author_facet | Angoletta, Maria Elena Ludwig, M Madsen, N Marqversen, O Pedersen, F |
author_sort | Angoletta, Maria Elena |
collection | CERN |
description | A novel system for real-time tune measurement during deceleration of a low-intensity particle beam is presented. The CERN Antiproton Decelerator decelerates low intensity (2x107) antiproton beams from 3.5 GeV/c to 100 MeV/c. Because of the eddy-currents in the magnets, a tune-measurement during a pause in the deceleration would not be representative. One must thus be able to measure the tune in real time during the deceleration. The low intensity of the antiproton beam prevents the use of standard Schottky techniques, and swept Beam Transfer Function (BTF) measurements are too slow. A system was therefore developed which uses an M-shaped power spectrum, exciting the beam in a band around the expected frequency of a betatron side-band. Excitation at the betatron frequency, where beam response is highest, is thus minimized and measurements of BTF, and therefore the tune, can be made with much reduced emittance blow-up |
id | cern-562002 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2001 |
record_format | invenio |
spelling | cern-5620022022-08-17T13:35:24Zhttp://cds.cern.ch/record/562002engAngoletta, Maria ElenaLudwig, MMadsen, NMarqversen, OPedersen, FReal-Time Tune Measurements on the CERN Antiproton DeceleratorAccelerators and Storage RingsA novel system for real-time tune measurement during deceleration of a low-intensity particle beam is presented. The CERN Antiproton Decelerator decelerates low intensity (2x107) antiproton beams from 3.5 GeV/c to 100 MeV/c. Because of the eddy-currents in the magnets, a tune-measurement during a pause in the deceleration would not be representative. One must thus be able to measure the tune in real time during the deceleration. The low intensity of the antiproton beam prevents the use of standard Schottky techniques, and swept Beam Transfer Function (BTF) measurements are too slow. A system was therefore developed which uses an M-shaped power spectrum, exciting the beam in a band around the expected frequency of a betatron side-band. Excitation at the betatron frequency, where beam response is highest, is thus minimized and measurements of BTF, and therefore the tune, can be made with much reduced emittance blow-upCERN-PS-2001-075-BDoai:cds.cern.ch:5620022001-06-20 |
spellingShingle | Accelerators and Storage Rings Angoletta, Maria Elena Ludwig, M Madsen, N Marqversen, O Pedersen, F Real-Time Tune Measurements on the CERN Antiproton Decelerator |
title | Real-Time Tune Measurements on the CERN Antiproton Decelerator |
title_full | Real-Time Tune Measurements on the CERN Antiproton Decelerator |
title_fullStr | Real-Time Tune Measurements on the CERN Antiproton Decelerator |
title_full_unstemmed | Real-Time Tune Measurements on the CERN Antiproton Decelerator |
title_short | Real-Time Tune Measurements on the CERN Antiproton Decelerator |
title_sort | real-time tune measurements on the cern antiproton decelerator |
topic | Accelerators and Storage Rings |
url | http://cds.cern.ch/record/562002 |
work_keys_str_mv | AT angolettamariaelena realtimetunemeasurementsonthecernantiprotondecelerator AT ludwigm realtimetunemeasurementsonthecernantiprotondecelerator AT madsenn realtimetunemeasurementsonthecernantiprotondecelerator AT marqverseno realtimetunemeasurementsonthecernantiprotondecelerator AT pedersenf realtimetunemeasurementsonthecernantiprotondecelerator |