Journal Article

DESY-2013-00598

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Statistical Methods for Transverse Beam Position Diagnostics with Higher Order Modes in Third Harmonic 3.9GHz Superconducting Accelerating Cavities at FLASH

Zhang, P. (Corresponding author)Extern* ; Baboi, N.-I.DESY* ; Jones, R. M.

2014
North-Holland Publ. Co. Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.nima.2012.11.057

Abstract: Beam-excited higher order modes (HOM) can be used to provide beam diagnostics. Here we focus on 3.9 GHz superconducting accelerating cavities. In particular we study dipole mode excitation and its application to beam position determinations. In order to extract beam position information, linear regression can be used. Due to a large number of sampling points in the waveforms, statistical methods are used to effectively reduce the dimension of the system, such as singular value decomposition (SVD) and k-means clustering. These are compared with the direct linear regression (DLR) on the entire waveforms. A cross-validation technique is used to study the sample independent precisions of the position predictions given by these three methods. A RMS prediction error in the beam position of approximately 50 micron can be achieved by DLR and SVD, while k-means clustering suggests 70 micron.

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Contributing Institute(s):

1. Strahlstrom- und Strahllagemesssysteme (MDI 4)

Research Program(s):

1. Facility (machine) FLASH (POF2-FLASH-20130405) (POF2-FLASH-20130405)
2. EUCARD - European Coordination for Accelerator Research and Development (227579) (227579)

Experiment(s):

1. Facility (machine) FLASH

Appears in the scientific report 2014

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Database coverage:
; ; Current Contents - Life Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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