Cargando…

Effect of a resonant excitation on the evolution of the beam emittance and halo population

Collimation with hollow electron beams or lenses (HEL) is currently one of the most promising concepts for active halo control in HL-LHC. In previous studies it has been shown that the halo can be efficiently removed with a hollow electron lens. Equally important as an efficient removal of the halo,...

Descripción completa

Detalles Bibliográficos
Autores principales: Fitterer, Miriam, Stancari, Giulio, Valishev, Alexander, Bruce, Roderik, Redaelli, Stefano, Salvachua Ferrando, Belen Maria, Valuch, Daniel, Valentino, Gianluca, Wagner, Joschka
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:http://cds.cern.ch/record/2305121
_version_ 1780957496584699904
author Fitterer, Miriam
Stancari, Giulio
Valishev, Alexander
Bruce, Roderik
Redaelli, Stefano
Salvachua Ferrando, Belen Maria
Valuch, Daniel
Valentino, Gianluca
Wagner, Joschka
author_facet Fitterer, Miriam
Stancari, Giulio
Valishev, Alexander
Bruce, Roderik
Redaelli, Stefano
Salvachua Ferrando, Belen Maria
Valuch, Daniel
Valentino, Gianluca
Wagner, Joschka
author_sort Fitterer, Miriam
collection CERN
description Collimation with hollow electron beams or lenses (HEL) is currently one of the most promising concepts for active halo control in HL-LHC. In previous studies it has been shown that the halo can be efficiently removed with a hollow electron lens. Equally important as an efficient removal of the halo, is to demonstrate that the core stays unperturbed. In the case of an ideal hollow electron lens without bends, the field at the location of the beam core vanishes and the core thus remains unperturbed. In reality, the field at the beam core does not vanish entirely due to imperfections in the electron beam profile and the electron lens bends necessary to guide the electron in and out of the proton aperture. In particular, in the case of a pulsed operation of the electron lens the non-vanishing residual field induces noise on the proton beam. To identify the most sensitive pulsing patterns for the resonant mode and derive tolerances on the profile imperfections, a first MD (MD1415) was carried out on 24.08.2016 [1] and a second MD on 17.09.2017. In this note we present the results of the second MD (MD2167), which focused on confirming a part of the results of the first MD and testing in addition a resonant excitation for which no effect on the beam core is expected and the effect of random uniform noise in addition.
id cern-2305121
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
record_format invenio
spelling cern-23051212019-09-30T06:29:59Zhttp://cds.cern.ch/record/2305121engFitterer, MiriamStancari, GiulioValishev, AlexanderBruce, RoderikRedaelli, StefanoSalvachua Ferrando, Belen MariaValuch, DanielValentino, GianlucaWagner, JoschkaEffect of a resonant excitation on the evolution of the beam emittance and halo populationAccelerators and Storage RingsCollimation with hollow electron beams or lenses (HEL) is currently one of the most promising concepts for active halo control in HL-LHC. In previous studies it has been shown that the halo can be efficiently removed with a hollow electron lens. Equally important as an efficient removal of the halo, is to demonstrate that the core stays unperturbed. In the case of an ideal hollow electron lens without bends, the field at the location of the beam core vanishes and the core thus remains unperturbed. In reality, the field at the beam core does not vanish entirely due to imperfections in the electron beam profile and the electron lens bends necessary to guide the electron in and out of the proton aperture. In particular, in the case of a pulsed operation of the electron lens the non-vanishing residual field induces noise on the proton beam. To identify the most sensitive pulsing patterns for the resonant mode and derive tolerances on the profile imperfections, a first MD (MD1415) was carried out on 24.08.2016 [1] and a second MD on 17.09.2017. In this note we present the results of the second MD (MD2167), which focused on confirming a part of the results of the first MD and testing in addition a resonant excitation for which no effect on the beam core is expected and the effect of random uniform noise in addition.CERN-ACC-NOTE-2018-0007oai:cds.cern.ch:23051212018-02-20
spellingShingle Accelerators and Storage Rings
Fitterer, Miriam
Stancari, Giulio
Valishev, Alexander
Bruce, Roderik
Redaelli, Stefano
Salvachua Ferrando, Belen Maria
Valuch, Daniel
Valentino, Gianluca
Wagner, Joschka
Effect of a resonant excitation on the evolution of the beam emittance and halo population
title Effect of a resonant excitation on the evolution of the beam emittance and halo population
title_full Effect of a resonant excitation on the evolution of the beam emittance and halo population
title_fullStr Effect of a resonant excitation on the evolution of the beam emittance and halo population
title_full_unstemmed Effect of a resonant excitation on the evolution of the beam emittance and halo population
title_short Effect of a resonant excitation on the evolution of the beam emittance and halo population
title_sort effect of a resonant excitation on the evolution of the beam emittance and halo population
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/2305121
work_keys_str_mv AT fitterermiriam effectofaresonantexcitationontheevolutionofthebeamemittanceandhalopopulation
AT stancarigiulio effectofaresonantexcitationontheevolutionofthebeamemittanceandhalopopulation
AT valishevalexander effectofaresonantexcitationontheevolutionofthebeamemittanceandhalopopulation
AT bruceroderik effectofaresonantexcitationontheevolutionofthebeamemittanceandhalopopulation
AT redaellistefano effectofaresonantexcitationontheevolutionofthebeamemittanceandhalopopulation
AT salvachuaferrandobelenmaria effectofaresonantexcitationontheevolutionofthebeamemittanceandhalopopulation
AT valuchdaniel effectofaresonantexcitationontheevolutionofthebeamemittanceandhalopopulation
AT valentinogianluca effectofaresonantexcitationontheevolutionofthebeamemittanceandhalopopulation
AT wagnerjoschka effectofaresonantexcitationontheevolutionofthebeamemittanceandhalopopulation