Analytical N beam position monitor method
Measurement and correction of focusing errors is of great importance for performance and machine protection of circular accelerators. Furthermore LHC needs to provide equal luminosities to the experiments ATLAS and CMS. High demands are also set on the speed of the optics commissioning, as the fores...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2017-11-01
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| Series: | Physical Review Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.20.111002 |
| _version_ | 1828432743168475136 |
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| author | A. Wegscheider A. Langner R. Tomás A. Franchi |
| author_facet | A. Wegscheider A. Langner R. Tomás A. Franchi |
| author_sort | A. Wegscheider |
| collection | DOAJ |
| description | Measurement and correction of focusing errors is of great importance for performance and machine protection of circular accelerators. Furthermore LHC needs to provide equal luminosities to the experiments ATLAS and CMS. High demands are also set on the speed of the optics commissioning, as the foreseen operation with β^{*}-leveling on luminosity will require many operational optics. A fast measurement of the β-function around a storage ring is usually done by using the measured phase advance between three consecutive beam position monitors (BPMs). A recent extension of this established technique, called the N-BPM method, was successfully applied for optics measurements at CERN, ALBA, and ESRF. We present here an improved algorithm that uses analytical calculations for both random and systematic errors and takes into account the presence of quadrupole, sextupole, and BPM misalignments, in addition to quadrupolar field errors. This new scheme, called the analytical N-BPM method, is much faster, further improves the measurement accuracy, and is applicable to very pushed beam optics where the existing numerical N-BPM method tends to fail. |
| first_indexed | 2024-12-10T18:24:18Z |
| format | Article |
| id | doaj.art-f0a99105a546480ca9a0f4a6fc081558 |
| institution | Directory Open Access Journal |
| issn | 2469-9888 |
| language | English |
| last_indexed | 2024-12-10T18:24:18Z |
| publishDate | 2017-11-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Accelerators and Beams |
| spelling | doaj.art-f0a99105a546480ca9a0f4a6fc0815582022-12-22T01:38:07ZengAmerican Physical SocietyPhysical Review Accelerators and Beams2469-98882017-11-01201111100210.1103/PhysRevAccelBeams.20.111002Analytical N beam position monitor methodA. WegscheiderA. LangnerR. TomásA. FranchiMeasurement and correction of focusing errors is of great importance for performance and machine protection of circular accelerators. Furthermore LHC needs to provide equal luminosities to the experiments ATLAS and CMS. High demands are also set on the speed of the optics commissioning, as the foreseen operation with β^{*}-leveling on luminosity will require many operational optics. A fast measurement of the β-function around a storage ring is usually done by using the measured phase advance between three consecutive beam position monitors (BPMs). A recent extension of this established technique, called the N-BPM method, was successfully applied for optics measurements at CERN, ALBA, and ESRF. We present here an improved algorithm that uses analytical calculations for both random and systematic errors and takes into account the presence of quadrupole, sextupole, and BPM misalignments, in addition to quadrupolar field errors. This new scheme, called the analytical N-BPM method, is much faster, further improves the measurement accuracy, and is applicable to very pushed beam optics where the existing numerical N-BPM method tends to fail.http://doi.org/10.1103/PhysRevAccelBeams.20.111002 |
| spellingShingle | A. Wegscheider A. Langner R. Tomás A. Franchi Analytical N beam position monitor method Physical Review Accelerators and Beams |
| title | Analytical N beam position monitor method |
| title_full | Analytical N beam position monitor method |
| title_fullStr | Analytical N beam position monitor method |
| title_full_unstemmed | Analytical N beam position monitor method |
| title_short | Analytical N beam position monitor method |
| title_sort | analytical n beam position monitor method |
| url | http://doi.org/10.1103/PhysRevAccelBeams.20.111002 |
| work_keys_str_mv | AT awegscheider analyticalnbeampositionmonitormethod AT alangner analyticalnbeampositionmonitormethod AT rtomas analyticalnbeampositionmonitormethod AT afranchi analyticalnbeampositionmonitormethod |