Impedance Reduction in the CERN SPS as seen from Longitudinal Beam Measurements

The longitudinal single bunch (microwave) instability of the proton beam in the CERN SPS, observed for the first time in 1977, became an important issue with the high intensity and high quality beams required for transfer to LHC. The main sources of impedance causing this instability were found in 1...

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Detalles Bibliográficos
Autores principales: Bohl, T, Linnecar, Trevor Paul R, Shaposhnikova, Elena
Lenguaje:eng
Publicado: 2002
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/560924
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author Bohl, T
Linnecar, Trevor Paul R
Shaposhnikova, Elena
author_facet Bohl, T
Linnecar, Trevor Paul R
Shaposhnikova, Elena
author_sort Bohl, T
collection CERN
description The longitudinal single bunch (microwave) instability of the proton beam in the CERN SPS, observed for the first time in 1977, became an important issue with the high intensity and high quality beams required for transfer to LHC. The main sources of impedance causing this instability were found in 1996 from measurements of the spectrum of unstable single bunches. During the 2000/2001 shutdown the major part of an impedance reduction programme was completed. Comparative beam measurements from before and after this programme are presented. While results obtained with short captured bunches allow us to see the overall bunch stability improvement, measurements with long bunches and RF off allow this impedance change to be distinguished at particular frequencies.
id cern-560924
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2002
record_format invenio
spelling cern-5609242023-05-05T13:08:16Zhttp://cds.cern.ch/record/560924engBohl, TLinnecar, Trevor Paul RShaposhnikova, ElenaImpedance Reduction in the CERN SPS as seen from Longitudinal Beam MeasurementsAccelerators and Storage RingsThe longitudinal single bunch (microwave) instability of the proton beam in the CERN SPS, observed for the first time in 1977, became an important issue with the high intensity and high quality beams required for transfer to LHC. The main sources of impedance causing this instability were found in 1996 from measurements of the spectrum of unstable single bunches. During the 2000/2001 shutdown the major part of an impedance reduction programme was completed. Comparative beam measurements from before and after this programme are presented. While results obtained with short captured bunches allow us to see the overall bunch stability improvement, measurements with long bunches and RF off allow this impedance change to be distinguished at particular frequencies.CERN-SL-2002-023-HRFoai:cds.cern.ch:5609242002-05-31
spellingShingle Accelerators and Storage Rings
Bohl, T
Linnecar, Trevor Paul R
Shaposhnikova, Elena
Impedance Reduction in the CERN SPS as seen from Longitudinal Beam Measurements
title Impedance Reduction in the CERN SPS as seen from Longitudinal Beam Measurements
title_full Impedance Reduction in the CERN SPS as seen from Longitudinal Beam Measurements
title_fullStr Impedance Reduction in the CERN SPS as seen from Longitudinal Beam Measurements
title_full_unstemmed Impedance Reduction in the CERN SPS as seen from Longitudinal Beam Measurements
title_short Impedance Reduction in the CERN SPS as seen from Longitudinal Beam Measurements
title_sort impedance reduction in the cern sps as seen from longitudinal beam measurements
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/560924
work_keys_str_mv AT bohlt impedancereductioninthecernspsasseenfromlongitudinalbeammeasurements
AT linnecartrevorpaulr impedancereductioninthecernspsasseenfromlongitudinalbeammeasurements
AT shaposhnikovaelena impedancereductioninthecernspsasseenfromlongitudinalbeammeasurements

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