Correction of beam-beam effects in luminosity measurement in the forward region at CLIC

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Procedures for correcting the beam-beam effects in luminosity measurement at CLIC at 3 TeV CM energy are described and tested using Monte Carlo simulations: - Correction of the angular counting loss due to the combined Beamstrahlung and initial-state radiation (ISR) effects, based on the reconstruct...

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Autores principales: Lukic, Strahinja, Božović-Jelisavčić, I., Pandurović, M., Smiljanić, I.
Lenguaje:eng
Publicado: 2013
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.1088/1748-0221/8/05/P05008
http://cds.cern.ch/record/1504226
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author Lukic, Strahinja
Božović-Jelisavčić, I.
Pandurović, M.
Smiljanić, I.
author_facet Lukic, Strahinja
Božović-Jelisavčić, I.
Pandurović, M.
Smiljanić, I.
author_sort Lukic, Strahinja
collection CERN
description Procedures for correcting the beam-beam effects in luminosity measurement at CLIC at 3 TeV CM energy are described and tested using Monte Carlo simulations: - Correction of the angular counting loss due to the combined Beamstrahlung and initial-state radiation (ISR) effects, based on the reconstructed velocity of the collision frame of the Bhabha scattering. - Deconvolution of the luminosity spectrum distortion due to the ISR emission. - Correction of the counting bias due to the finite calorimeter energy resolution. All procedures were tested by simulation. Bhabha events were generated using BHLUMI, and used in Guinea-PIG to simulate the outgoing momenta of Bhabha particles in the bunch collisions at CLIC. Residual uncertainties after correction are listed in a table in the conclusions. The beam-beam related systematic counting uncertainty in the luminosity peak can be reduced to the order of permille.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2013
record_format invenio
spelling cern-15042262021-05-03T20:13:08Zdoi:10.1088/1748-0221/8/05/P05008http://cds.cern.ch/record/1504226engLukic, StrahinjaBožović-Jelisavčić, I.Pandurović, M.Smiljanić, I.Correction of beam-beam effects in luminosity measurement in the forward region at CLICAccelerators and Storage RingsProcedures for correcting the beam-beam effects in luminosity measurement at CLIC at 3 TeV CM energy are described and tested using Monte Carlo simulations: - Correction of the angular counting loss due to the combined Beamstrahlung and initial-state radiation (ISR) effects, based on the reconstructed velocity of the collision frame of the Bhabha scattering. - Deconvolution of the luminosity spectrum distortion due to the ISR emission. - Correction of the counting bias due to the finite calorimeter energy resolution. All procedures were tested by simulation. Bhabha events were generated using BHLUMI, and used in Guinea-PIG to simulate the outgoing momenta of Bhabha particles in the bunch collisions at CLIC. Residual uncertainties after correction are listed in a table in the conclusions. The beam-beam related systematic counting uncertainty in the luminosity peak can be reduced to the order of permille.Procedures for correcting the beam-beam effects in luminosity measurements at CLIC at 3 TeV center-of-mass energy are described and tested using Monte Carlo simulations. The angular counting loss due to the combined Beamstrahlung and initial-state radiation effects is corrected based on the reconstructed velocity of the collision frame of the Bhabha scattering. The distortion of the luminosity spectrum due to the initial-state radiation is corrected by deconvolution. At the end, the counting bias due to the finite calorimeter energy resolution is numerically corrected. To test the procedures, BHLUMI Bhabha event generator, and Guinea-Pig beam-beam simulation were used to generate the outgoing momenta of Bhabha particles in the bunch collisions at CLIC. The systematic effects of the beam-beam interaction on the luminosity measurement are corrected with precision of 1.4 permille in the upper 5% of the energy, and 2.7 permille in the range between 80 and 90% of the nominal center-of-mass energy.Procedures for correcting the beam-beam effects in luminosity measurements at CLIC at 3 TeV center-of-mass energy are described and tested using Monte Carlo simulations. The angular counting loss due to the combined Beamstrahlung and initial-state radiation effects is corrected based on the reconstructed velocity of the collision frame of the Bhabha scattering. The distortion of the luminosity spectrum due to the initial-state radiation is corrected by deconvolution. At the end, the counting bias due to the finite calorimeter energy resolution is numerically corrected. To test the procedures, BHLUMI Bhabha event generator, and Guinea-Pig beam-beam simulation were used to generate the outgoing momenta of Bhabha particles in the bunch collisions at CLIC. The systematic effects of the beam-beam interaction on the luminosity measurement are corrected with precision of 1.4 permille in the upper 5% of the energy, and 2.7 permille in the range between 80 and 90% of the nominal center-of-mass energy.LCD-NOTE-2012-008arXiv:1301.1449oai:cds.cern.ch:15042262013-01-09
spellingShingle Accelerators and Storage Rings
Lukic, Strahinja
Božović-Jelisavčić, I.
Pandurović, M.
Smiljanić, I.
Correction of beam-beam effects in luminosity measurement in the forward region at CLIC
title Correction of beam-beam effects in luminosity measurement in the forward region at CLIC
title_full Correction of beam-beam effects in luminosity measurement in the forward region at CLIC
title_fullStr Correction of beam-beam effects in luminosity measurement in the forward region at CLIC
title_full_unstemmed Correction of beam-beam effects in luminosity measurement in the forward region at CLIC
title_short Correction of beam-beam effects in luminosity measurement in the forward region at CLIC
title_sort correction of beam-beam effects in luminosity measurement in the forward region at clic
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1088/1748-0221/8/05/P05008
http://cds.cern.ch/record/1504226
work_keys_str_mv AT lukicstrahinja correctionofbeambeameffectsinluminositymeasurementintheforwardregionatclic
AT bozovicjelisavcici correctionofbeambeameffectsinluminositymeasurementintheforwardregionatclic
AT pandurovicm correctionofbeambeameffectsinluminositymeasurementintheforwardregionatclic
AT smiljanici correctionofbeambeameffectsinluminositymeasurementintheforwardregionatclic

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