Dust-induced beam losses in the cryogenic arcs of the CERN Large Hadron Collider
The interaction of dust particles with the LHC proton beams accounts for a major fraction of irregular beam loss events observed in LHC physics operation. The events cease after a few beam revolutions because of the expulsion of dust particles from the beam once they become ionized in the transverse...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-04-01
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| Series: | Physical Review Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.25.041001 |
| _version_ | 1811303604651294720 |
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| author | A. Lechner P. Bélanger I. Efthymiopoulos L. Grob B. Lindstrom R. Schmidt D. Wollmann |
| author_facet | A. Lechner P. Bélanger I. Efthymiopoulos L. Grob B. Lindstrom R. Schmidt D. Wollmann |
| author_sort | A. Lechner |
| collection | DOAJ |
| description | The interaction of dust particles with the LHC proton beams accounts for a major fraction of irregular beam loss events observed in LHC physics operation. The events cease after a few beam revolutions because of the expulsion of dust particles from the beam once they become ionized in the transverse beam tails. Despite the transient nature of these events, the resulting beam losses can trigger beam aborts or provoke quenches of superconducting magnets. In this paper, we study the characteristics of beam-dust particle interactions in the cryogenic arcs by reconstructing key observables like nuclear collision rates, loss durations and integral losses per event. The study is based on events recorded during 6.5 TeV operation with stored beam intensities of up to ∼3×10^{14} protons per beam. We show that inelastic collision rates can reach almost 10^{12} collisions per second, resulting in a loss of up to ∼1.6×10^{8} protons per event. We demonstrate that the experimental distributions and their dependence on beam parameters can be described quantitatively by a previously developed simulation model if dust particles are assumed to be attracted by the beam. The latter finding is consistent with recent time profile studies and yields further evidence that dust particles carry a negative charge when entering the beam. We also develop different hypotheses regarding the absence of higher-loss events in the measurements, although such events are theoretically not excluded by the simulation model. The results provide grounds for predicting dust-induced beam losses in the presence of higher-intensity beams in future runs of the High-Luminosity LHC. |
| first_indexed | 2024-04-13T07:50:57Z |
| format | Article |
| id | doaj.art-203abc4b957b45468e238b90f76dc8c4 |
| institution | Directory Open Access Journal |
| issn | 2469-9888 |
| language | English |
| last_indexed | 2024-04-13T07:50:57Z |
| publishDate | 2022-04-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Accelerators and Beams |
| spelling | doaj.art-203abc4b957b45468e238b90f76dc8c42022-12-22T02:55:32ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882022-04-0125404100110.1103/PhysRevAccelBeams.25.041001Dust-induced beam losses in the cryogenic arcs of the CERN Large Hadron ColliderA. LechnerP. BélangerI. EfthymiopoulosL. GrobB. LindstromR. SchmidtD. WollmannThe interaction of dust particles with the LHC proton beams accounts for a major fraction of irregular beam loss events observed in LHC physics operation. The events cease after a few beam revolutions because of the expulsion of dust particles from the beam once they become ionized in the transverse beam tails. Despite the transient nature of these events, the resulting beam losses can trigger beam aborts or provoke quenches of superconducting magnets. In this paper, we study the characteristics of beam-dust particle interactions in the cryogenic arcs by reconstructing key observables like nuclear collision rates, loss durations and integral losses per event. The study is based on events recorded during 6.5 TeV operation with stored beam intensities of up to ∼3×10^{14} protons per beam. We show that inelastic collision rates can reach almost 10^{12} collisions per second, resulting in a loss of up to ∼1.6×10^{8} protons per event. We demonstrate that the experimental distributions and their dependence on beam parameters can be described quantitatively by a previously developed simulation model if dust particles are assumed to be attracted by the beam. The latter finding is consistent with recent time profile studies and yields further evidence that dust particles carry a negative charge when entering the beam. We also develop different hypotheses regarding the absence of higher-loss events in the measurements, although such events are theoretically not excluded by the simulation model. The results provide grounds for predicting dust-induced beam losses in the presence of higher-intensity beams in future runs of the High-Luminosity LHC.http://doi.org/10.1103/PhysRevAccelBeams.25.041001 |
| spellingShingle | A. Lechner P. Bélanger I. Efthymiopoulos L. Grob B. Lindstrom R. Schmidt D. Wollmann Dust-induced beam losses in the cryogenic arcs of the CERN Large Hadron Collider Physical Review Accelerators and Beams |
| title | Dust-induced beam losses in the cryogenic arcs of the CERN Large Hadron Collider |
| title_full | Dust-induced beam losses in the cryogenic arcs of the CERN Large Hadron Collider |
| title_fullStr | Dust-induced beam losses in the cryogenic arcs of the CERN Large Hadron Collider |
| title_full_unstemmed | Dust-induced beam losses in the cryogenic arcs of the CERN Large Hadron Collider |
| title_short | Dust-induced beam losses in the cryogenic arcs of the CERN Large Hadron Collider |
| title_sort | dust induced beam losses in the cryogenic arcs of the cern large hadron collider |
| url | http://doi.org/10.1103/PhysRevAccelBeams.25.041001 |
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