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Preliminary Results from Validation Measurements of the Longitudinal Power Deposition Model for the LHC Injection Kicker Magnet
During Run 1 of the LHC, one of the injection kicker magnets (MKIs) exhibited an excessively high ferrite temperature, caused by coupling of the high intensity beam to the real impedance of the magnet. Beam-screen upgrades, implemented during Long Shutdown 1 (LS1), have been very effective in reduci...
Autores principales: | , , |
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Lenguaje: | eng |
Publicado: |
2018
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.18429/JACoW-IPAC2018-WEPMK005 http://cds.cern.ch/record/2672231 |
_version_ | 1780962531589750784 |
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author | Vlachodimitropoulos, Vasileios Barnes, Michael Chmielinska, Agnieszka |
author_facet | Vlachodimitropoulos, Vasileios Barnes, Michael Chmielinska, Agnieszka |
author_sort | Vlachodimitropoulos, Vasileios |
collection | CERN |
description | During Run 1 of the LHC, one of the injection kicker magnets (MKIs) exhibited an excessively high ferrite temperature, caused by coupling of the high intensity beam to the real impedance of the magnet. Beam-screen upgrades, implemented during Long Shutdown 1 (LS1), have been very effective in reducing beam coupling impedance and since then the MKIs have not limited LHC's availability. However, temperature measurements during operation have shown that one end of the MKI's ferrite yoke is consistently hotter than the other. Detailed simulation models and data post-processing algorithms have been developed to understand and mitigate the observed behaviour. In the present paper, the model used to obtain the power loss distribution along the magnet is presented. The model is subsequently applied to two MKI design configurations under study: (i) the one currently in operation and (ii) an upgraded magnet that was installed in the LHC tunnel during the Year End Technical Stop (YETS) 2017/18. In order to validate the expected behaviour a novel measurement technique was developed, applied in both configurations and compared to predictions. The results obtained are reported and conclusions regarding the effectiveness of the design are drawn. |
id | oai-inspirehep.net-1690197 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2018 |
record_format | invenio |
spelling | oai-inspirehep.net-16901972019-09-30T06:29:59Zdoi:10.18429/JACoW-IPAC2018-WEPMK005http://cds.cern.ch/record/2672231engVlachodimitropoulos, VasileiosBarnes, MichaelChmielinska, AgnieszkaPreliminary Results from Validation Measurements of the Longitudinal Power Deposition Model for the LHC Injection Kicker MagnetAccelerators and Storage RingsDuring Run 1 of the LHC, one of the injection kicker magnets (MKIs) exhibited an excessively high ferrite temperature, caused by coupling of the high intensity beam to the real impedance of the magnet. Beam-screen upgrades, implemented during Long Shutdown 1 (LS1), have been very effective in reducing beam coupling impedance and since then the MKIs have not limited LHC's availability. However, temperature measurements during operation have shown that one end of the MKI's ferrite yoke is consistently hotter than the other. Detailed simulation models and data post-processing algorithms have been developed to understand and mitigate the observed behaviour. In the present paper, the model used to obtain the power loss distribution along the magnet is presented. The model is subsequently applied to two MKI design configurations under study: (i) the one currently in operation and (ii) an upgraded magnet that was installed in the LHC tunnel during the Year End Technical Stop (YETS) 2017/18. In order to validate the expected behaviour a novel measurement technique was developed, applied in both configurations and compared to predictions. The results obtained are reported and conclusions regarding the effectiveness of the design are drawn.oai:inspirehep.net:16901972018 |
spellingShingle | Accelerators and Storage Rings Vlachodimitropoulos, Vasileios Barnes, Michael Chmielinska, Agnieszka Preliminary Results from Validation Measurements of the Longitudinal Power Deposition Model for the LHC Injection Kicker Magnet |
title | Preliminary Results from Validation Measurements of the Longitudinal Power Deposition Model for the LHC Injection Kicker Magnet |
title_full | Preliminary Results from Validation Measurements of the Longitudinal Power Deposition Model for the LHC Injection Kicker Magnet |
title_fullStr | Preliminary Results from Validation Measurements of the Longitudinal Power Deposition Model for the LHC Injection Kicker Magnet |
title_full_unstemmed | Preliminary Results from Validation Measurements of the Longitudinal Power Deposition Model for the LHC Injection Kicker Magnet |
title_short | Preliminary Results from Validation Measurements of the Longitudinal Power Deposition Model for the LHC Injection Kicker Magnet |
title_sort | preliminary results from validation measurements of the longitudinal power deposition model for the lhc injection kicker magnet |
topic | Accelerators and Storage Rings |
url | https://dx.doi.org/10.18429/JACoW-IPAC2018-WEPMK005 http://cds.cern.ch/record/2672231 |
work_keys_str_mv | AT vlachodimitropoulosvasileios preliminaryresultsfromvalidationmeasurementsofthelongitudinalpowerdepositionmodelforthelhcinjectionkickermagnet AT barnesmichael preliminaryresultsfromvalidationmeasurementsofthelongitudinalpowerdepositionmodelforthelhcinjectionkickermagnet AT chmielinskaagnieszka preliminaryresultsfromvalidationmeasurementsofthelongitudinalpowerdepositionmodelforthelhcinjectionkickermagnet |