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DC Field | Value | Language |
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dc.contributor.author | Lamont, Mike | |
dc.contributor.author | Strzeclzyk, Marek | |
dc.contributor.author | Todesco, Ezio | |
dc.contributor.author | Sammut, Nicholas | |
dc.contributor.author | Aquilina, N. | |
dc.date.accessioned | 2018-02-05T13:18:21Z | |
dc.date.available | 2018-02-05T13:18:21Z | |
dc.date.issued | 2012 | |
dc.identifier.citation | Lamont, M., Strzeclzyk, M., Todesco, E., Sammut, N., & Aquilina, N. (2012).Chromaticity decay due to superconducting dipoles on the injection plateau of the Large Hadron Collider. Physical Review Special Topics - Accelerators and Beams, 15(3), 032401-1-8. | en_GB |
dc.identifier.uri | https://www.um.edu.mt/library/oar//handle/123456789/26411 | |
dc.description.abstract | It is well known that in a superconducting accelerator a significant chromaticity drift can be induced by the decay of the sextupolar component of the main dipoles. In this paper we give a brief overview of what was expected for the Large Hadron Collider (LHC) on the grounds of magnetic measurements of individual dipoles carried out during the production. According to this analysis, the decay time constants were of the order of 200 s: since the injection in the LHC starts at least 30 minutes after the magnets are at constant current, the dynamic correction of this effect was not considered to be necessary. The first beam measurements of chromaticity showed significant decay even after a few hours. For this reason, a dynamic correction of decay on the injection plateau was implemented based on beam measurements. This means that during the injection plateau the sextupole correctors are powered with a varying current to cancel out the decay of the dipoles. This strategy has been implemented successfully. A similar phenomenon has been observed for the dependence of the decay amplitude on the powering history of the dipoles: according to magnetic measurements, also in this case time constants are of the order of 200 s and therefore no difference is expected between a one hour or a ten hours flattop. On the other hand, the beam measurements show a significant change of decay for these two conditions. For the moment there is no clue of the origin of these discrepancies. We give a complete overview of the two effects, and the modifications that have been done to the field model parameters to be able to obtain a final chromaticity correction within a few units. | en_GB |
dc.language.iso | en | en_GB |
dc.publisher | American Physical Society | en_GB |
dc.rights | info:eu-repo/semantics/openAccess | en_GB |
dc.subject | Large Hadron Collider (France and Switzerland) | en_GB |
dc.subject | Magnetic dipoles | en_GB |
dc.subject | Magnetic fields | en_GB |
dc.title | Chromaticity decay due to superconducting dipoles on the injection plateau of the Large Hadron Collider | en_GB |
dc.type | article | en_GB |
dc.rights.holder | The copyright of this work belongs to the author(s)/publisher. The rights of this work are as defined by the appropriate Copyright Legislation or as modified by any successive legislation. Users may access this work and can make use of the information contained in accordance with the Copyright Legislation provided that the author must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the prior permission of the copyright holder. | en_GB |
dc.description.reviewed | peer-reviewed | en_GB |
dc.identifier.doi | 10.1103/PhysRevSTAB.15.032401 | |
dc.publication.title | Physical Review Special Topics - Accelerators and Beams | en_GB |
Appears in Collections: | Scholarly Works - FacICTMN |
Files in This Item:
File | Description | Size | Format | |
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Chromaticity_decay_due_to_superconducting_dipoles_.pdf | 1.4 MB | Adobe PDF | View/Open |
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