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Suppression of Amplitude dependent closest tune approach and first tests of the ADT as an AC-dipole (MD 1412)
The amplitude detuning has been observed to decrease significantly as the horizontal and vertical tunes are approaching each other. The measured tune split (Qₓ −Qᵧ) versus amplitude was several times bigger than what can be explained with linear coupling during the non-linear MD in 2012 [1]. This effe...
| Autores principales: | , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2016
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| Materias: | |
| Acceso en línea: | http://cds.cern.ch/record/2220704 |
| _version_ | 1780952202008854528 |
|---|---|
| author | Persson, Tobias Hakan Bjorn Gasior, Marek Maclean, Ewen Hamish Olexa, Jakub Tomas Garcia, Rogelio Valuch, Daniel Wierichs, David Alexander Carlier, Felix Simon |
| author_facet | Persson, Tobias Hakan Bjorn Gasior, Marek Maclean, Ewen Hamish Olexa, Jakub Tomas Garcia, Rogelio Valuch, Daniel Wierichs, David Alexander Carlier, Felix Simon |
| author_sort | Persson, Tobias Hakan Bjorn |
| collection | CERN |
| description | The amplitude detuning has been observed to decrease significantly as the horizontal and vertical tunes are approaching each other. The measured tune split (Qₓ −Qᵧ) versus amplitude was several times bigger than what can be explained with linear coupling during the non-linear MD in 2012 [1]. This effect is potentially harmful since it might cause a loss of Landau damping, hence giving rise to instabilities. In this MD we validated the findings in the MD from 2012 and demonstrated the possibility to mitigate this effect through having opposite polarity of the focusing and defocusing octupoles (MOD and MOF). The amplitude dependent dependent closest tune approach was also measured with the AC-dipole and gave unexpected results. A first test of using the ADT as an AC-dipole was also performed. |
| id | cern-2220704 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2016 |
| record_format | invenio |
| spelling | cern-22207042019-09-30T06:29:59Zhttp://cds.cern.ch/record/2220704engPersson, Tobias Hakan BjornGasior, MarekMaclean, Ewen HamishOlexa, JakubTomas Garcia, RogelioValuch, DanielWierichs, David AlexanderCarlier, Felix SimonSuppression of Amplitude dependent closest tune approach and first tests of the ADT as an AC-dipole (MD 1412)Accelerators and Storage RingsThe amplitude detuning has been observed to decrease significantly as the horizontal and vertical tunes are approaching each other. The measured tune split (Qₓ −Qᵧ) versus amplitude was several times bigger than what can be explained with linear coupling during the non-linear MD in 2012 [1]. This effect is potentially harmful since it might cause a loss of Landau damping, hence giving rise to instabilities. In this MD we validated the findings in the MD from 2012 and demonstrated the possibility to mitigate this effect through having opposite polarity of the focusing and defocusing octupoles (MOD and MOF). The amplitude dependent dependent closest tune approach was also measured with the AC-dipole and gave unexpected results. A first test of using the ADT as an AC-dipole was also performed.CERN-ACC-NOTE-2016-0057oai:cds.cern.ch:22207042016-09-27 |
| spellingShingle | Accelerators and Storage Rings Persson, Tobias Hakan Bjorn Gasior, Marek Maclean, Ewen Hamish Olexa, Jakub Tomas Garcia, Rogelio Valuch, Daniel Wierichs, David Alexander Carlier, Felix Simon Suppression of Amplitude dependent closest tune approach and first tests of the ADT as an AC-dipole (MD 1412) |
| title | Suppression of Amplitude dependent closest tune approach and first tests of the ADT as an AC-dipole (MD 1412) |
| title_full | Suppression of Amplitude dependent closest tune approach and first tests of the ADT as an AC-dipole (MD 1412) |
| title_fullStr | Suppression of Amplitude dependent closest tune approach and first tests of the ADT as an AC-dipole (MD 1412) |
| title_full_unstemmed | Suppression of Amplitude dependent closest tune approach and first tests of the ADT as an AC-dipole (MD 1412) |
| title_short | Suppression of Amplitude dependent closest tune approach and first tests of the ADT as an AC-dipole (MD 1412) |
| title_sort | suppression of amplitude dependent closest tune approach and first tests of the adt as an ac-dipole (md 1412) |
| topic | Accelerators and Storage Rings |
| url | http://cds.cern.ch/record/2220704 |
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