Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Angoletta, Maria Elena, Ludwig, M, Madsen, N, Marqversen, O, Pedersen, F
Lenguaje:eng
Publicado: 2001
Materias:
Acceso en línea:http://cds.cern.ch/record/562002
_version_ 1780899105205125120
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