A study of beam position diagnostics using beam-excited dipole modes in third harmonic superconducting accelerating cavities at a free-electron laser
We investigate the feasibility of beam position diagnostics using higher order mode (HOM) signals excited by an electron beam in the third harmonic 3.9 GHz superconducting accelerating cavities at FLASH. After careful theoretical and experimental assessment of the HOM spectrum, three modal choices h...
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| Veröffentlicht in: | Review of scientific instruments 2012-08, Vol.83 (8), p.085117-085117 |
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| container_end_page | 085117 |
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| container_issue | 8 |
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| container_title | Review of scientific instruments |
| container_volume | 83 |
| creator | Zhang, Pei Baboi, Nicoleta Jones, Roger M Shinton, Ian R R Flisgen, Thomas Glock, Hans-Walter |
| description | We investigate the feasibility of beam position diagnostics using higher order mode (HOM) signals excited by an electron beam in the third harmonic 3.9 GHz superconducting accelerating cavities at FLASH. After careful theoretical and experimental assessment of the HOM spectrum, three modal choices have been narrowed down to fulfill different diagnostics requirements. These are localized dipole beam-pipe modes, trapped cavity modes from the fifth dipole band, and propagating modes from the first two dipole bands. These modes are treated with various data analysis techniques: modal identification, direct linear regression (DLR), and singular value decomposition (SVD). Promising options for beam diagnostics are found from all three modal choices. This constitutes the first prediction, subsequently confirmed by experiments, of trapped HOMs in third harmonic cavities, and also the first direct comparison of DLR and SVD in the analysis of HOM-based beam diagnostics. |
| doi_str_mv | 10.1063/1.4748517 |
| format | Article |
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After careful theoretical and experimental assessment of the HOM spectrum, three modal choices have been narrowed down to fulfill different diagnostics requirements. These are localized dipole beam-pipe modes, trapped cavity modes from the fifth dipole band, and propagating modes from the first two dipole bands. These modes are treated with various data analysis techniques: modal identification, direct linear regression (DLR), and singular value decomposition (SVD). Promising options for beam diagnostics are found from all three modal choices. This constitutes the first prediction, subsequently confirmed by experiments, of trapped HOMs in third harmonic cavities, and also the first direct comparison of DLR and SVD in the analysis of HOM-based beam diagnostics.</description><identifier>ISSN: 0034-6748</identifier><identifier>EISSN: 1089-7623</identifier><identifier>DOI: 10.1063/1.4748517</identifier><identifier>PMID: 22938342</identifier><language>eng</language><publisher>United States</publisher><subject>ACCELERATORS ; Assessments ; BEAM POSITION ; Beams (radiation) ; CAVITIES ; DATA ANALYSIS ; DECOMPOSITION ; Diagnostic systems ; DIPOLES ; ELECTRON BEAMS ; FREE ELECTRON LASERS ; Harmonics ; Holes ; INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY ; Modal choice ; REGRESSION ANALYSIS ; SPECTRA ; SUPERCONDUCTING DEVICES ; Superconductivity ; TRAPPING</subject><ispartof>Review of scientific instruments, 2012-08, Vol.83 (8), p.085117-085117</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c417t-c8b2fac42a29a326124357c1f4bf940d5ecf759ae7886beaca15cfafcc25f66f3</citedby><cites>FETCH-LOGICAL-c417t-c8b2fac42a29a326124357c1f4bf940d5ecf759ae7886beaca15cfafcc25f66f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/22938342$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/22093709$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Zhang, Pei</creatorcontrib><creatorcontrib>Baboi, Nicoleta</creatorcontrib><creatorcontrib>Jones, Roger M</creatorcontrib><creatorcontrib>Shinton, Ian R R</creatorcontrib><creatorcontrib>Flisgen, Thomas</creatorcontrib><creatorcontrib>Glock, Hans-Walter</creatorcontrib><title>A study of beam position diagnostics using beam-excited dipole modes in third harmonic superconducting accelerating cavities at a free-electron laser</title><title>Review of scientific instruments</title><addtitle>Rev Sci Instrum</addtitle><description>We investigate the feasibility of beam position diagnostics using higher order mode (HOM) signals excited by an electron beam in the third harmonic 3.9 GHz superconducting accelerating cavities at FLASH. After careful theoretical and experimental assessment of the HOM spectrum, three modal choices have been narrowed down to fulfill different diagnostics requirements. These are localized dipole beam-pipe modes, trapped cavity modes from the fifth dipole band, and propagating modes from the first two dipole bands. These modes are treated with various data analysis techniques: modal identification, direct linear regression (DLR), and singular value decomposition (SVD). Promising options for beam diagnostics are found from all three modal choices. This constitutes the first prediction, subsequently confirmed by experiments, of trapped HOMs in third harmonic cavities, and also the first direct comparison of DLR and SVD in the analysis of HOM-based beam diagnostics.</description><subject>ACCELERATORS</subject><subject>Assessments</subject><subject>BEAM POSITION</subject><subject>Beams (radiation)</subject><subject>CAVITIES</subject><subject>DATA ANALYSIS</subject><subject>DECOMPOSITION</subject><subject>Diagnostic systems</subject><subject>DIPOLES</subject><subject>ELECTRON BEAMS</subject><subject>FREE ELECTRON LASERS</subject><subject>Harmonics</subject><subject>Holes</subject><subject>INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY</subject><subject>Modal choice</subject><subject>REGRESSION ANALYSIS</subject><subject>SPECTRA</subject><subject>SUPERCONDUCTING DEVICES</subject><subject>Superconductivity</subject><subject>TRAPPING</subject><issn>0034-6748</issn><issn>1089-7623</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqFkc9u1DAQxi0EotuFAy-ALHEphxT_S5wcq4pSpEq9wDmanYy7RkkcbAfRB-n74u0uXLFkWdb3m5nv0zD2TopLKRr9SV4aa9pa2hdsI0XbVbZR-iXbCKFN1RTpjJ2n9EOUU0v5mp0p1elWG7VhT1c85XV45MHxHcHEl5B89mHmg4eHOaTsMfE1-fnhWa_oN_pMQ5GXMBKfwkCJ-5nnvY8D30OcwuyRp3WhiGEeVsyHWkCkkSI8fxB-lRmlDjIH7iJRVUTMsYwdIVF8w145GBO9Pb1b9v3m87fr2-ru_svX66u7Co20ucJ2pxygUaA60KqRyujaonRm5zojhprQ2boDsm3bFPcIskYHDlHVrmmc3rIPx76HnH06JMN9cT0XM71SotO23C27OFJLDD9XSrmffCpxRpgprKmXxUxrVdvp_6NCFy-6kW1BPx5RjCGlSK5fop8gPhaoP6y1l_1prYV9f2q77iYa_pF_96j_AInvn00</recordid><startdate>20120801</startdate><enddate>20120801</enddate><creator>Zhang, Pei</creator><creator>Baboi, Nicoleta</creator><creator>Jones, Roger M</creator><creator>Shinton, Ian R R</creator><creator>Flisgen, Thomas</creator><creator>Glock, Hans-Walter</creator><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>7SP</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20120801</creationdate><title>A study of beam position diagnostics using beam-excited dipole modes in third harmonic superconducting accelerating cavities at a free-electron laser</title><author>Zhang, Pei ; Baboi, Nicoleta ; Jones, Roger M ; Shinton, Ian R R ; Flisgen, Thomas ; Glock, Hans-Walter</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c417t-c8b2fac42a29a326124357c1f4bf940d5ecf759ae7886beaca15cfafcc25f66f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>ACCELERATORS</topic><topic>Assessments</topic><topic>BEAM POSITION</topic><topic>Beams (radiation)</topic><topic>CAVITIES</topic><topic>DATA ANALYSIS</topic><topic>DECOMPOSITION</topic><topic>Diagnostic systems</topic><topic>DIPOLES</topic><topic>ELECTRON BEAMS</topic><topic>FREE ELECTRON LASERS</topic><topic>Harmonics</topic><topic>Holes</topic><topic>INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY</topic><topic>Modal choice</topic><topic>REGRESSION ANALYSIS</topic><topic>SPECTRA</topic><topic>SUPERCONDUCTING DEVICES</topic><topic>Superconductivity</topic><topic>TRAPPING</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhang, Pei</creatorcontrib><creatorcontrib>Baboi, Nicoleta</creatorcontrib><creatorcontrib>Jones, Roger M</creatorcontrib><creatorcontrib>Shinton, Ian R R</creatorcontrib><creatorcontrib>Flisgen, Thomas</creatorcontrib><creatorcontrib>Glock, Hans-Walter</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>Review of scientific instruments</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhang, Pei</au><au>Baboi, Nicoleta</au><au>Jones, Roger M</au><au>Shinton, Ian R R</au><au>Flisgen, Thomas</au><au>Glock, Hans-Walter</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A study of beam position diagnostics using beam-excited dipole modes in third harmonic superconducting accelerating cavities at a free-electron laser</atitle><jtitle>Review of scientific instruments</jtitle><addtitle>Rev Sci Instrum</addtitle><date>2012-08-01</date><risdate>2012</risdate><volume>83</volume><issue>8</issue><spage>085117</spage><epage>085117</epage><pages>085117-085117</pages><issn>0034-6748</issn><eissn>1089-7623</eissn><abstract>We investigate the feasibility of beam position diagnostics using higher order mode (HOM) signals excited by an electron beam in the third harmonic 3.9 GHz superconducting accelerating cavities at FLASH. After careful theoretical and experimental assessment of the HOM spectrum, three modal choices have been narrowed down to fulfill different diagnostics requirements. These are localized dipole beam-pipe modes, trapped cavity modes from the fifth dipole band, and propagating modes from the first two dipole bands. These modes are treated with various data analysis techniques: modal identification, direct linear regression (DLR), and singular value decomposition (SVD). Promising options for beam diagnostics are found from all three modal choices. This constitutes the first prediction, subsequently confirmed by experiments, of trapped HOMs in third harmonic cavities, and also the first direct comparison of DLR and SVD in the analysis of HOM-based beam diagnostics.</abstract><cop>United States</cop><pmid>22938342</pmid><doi>10.1063/1.4748517</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Review of scientific instruments, 2012-08, Vol.83 (8), p.085117-085117 |
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| language | eng |
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| source | AIP Journals Complete; AIP Digital Archive; Alma/SFX Local Collection |
| subjects | ACCELERATORS Assessments BEAM POSITION Beams (radiation) CAVITIES DATA ANALYSIS DECOMPOSITION Diagnostic systems DIPOLES ELECTRON BEAMS FREE ELECTRON LASERS Harmonics Holes INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY Modal choice REGRESSION ANALYSIS SPECTRA SUPERCONDUCTING DEVICES Superconductivity TRAPPING |
| title | A study of beam position diagnostics using beam-excited dipole modes in third harmonic superconducting accelerating cavities at a free-electron laser |
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