Frequency dependence of trapped flux sensitivity in SRF cavities
In this letter, we present the frequency dependence of the vortex surface resistance of bulk niobium accelerating cavities as a function of different state-of-the-art surface treatments. Higher flux surface resistance per amount of trapped magnetic field—sensitivity—is observed for higher frequencie...
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| Veröffentlicht in: | Applied physics letters 2018-02, Vol.112 (7) |
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| creator | Checchin, M. Martinello, M. Grassellino, A. Aderhold, S. Chandrasekaran, S. K. Melnychuk, O. S. Posen, S. Romanenko, A. Sergatskov, D. A. |
| description | In this letter, we present the frequency dependence of the vortex surface resistance of bulk niobium accelerating cavities as a function of different state-of-the-art surface treatments. Higher flux surface resistance per amount of trapped magnetic field—sensitivity—is observed for higher frequencies, in agreement with our theoretical model. Higher sensitivity is observed for N-doped cavities, which possess an intermediate value of the electron mean-free-path, compared to 120 °C and EP/BCP cavities. Experimental results from our study showed that the sensitivity has a non-monotonic trend as a function of the mean-free-path, including frequencies other than 1.3 GHz, and that the vortex response to the rf field can be tuned from the pinning regime to flux-flow regime by manipulating the frequency and/or the mean-free-path of the resonator, as reported in our previous studies. The frequency dependence of the trapped flux sensitivity to the amplitude of the accelerating gradient is also highlighted. |
| doi_str_mv | 10.1063/1.5016525 |
| format | Article |
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K. ; Melnychuk, O. S. ; Posen, S. ; Romanenko, A. ; Sergatskov, D. A.</creator><creatorcontrib>Checchin, M. ; Martinello, M. ; Grassellino, A. ; Aderhold, S. ; Chandrasekaran, S. K. ; Melnychuk, O. S. ; Posen, S. ; Romanenko, A. ; Sergatskov, D. A. ; Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)</creatorcontrib><description>In this letter, we present the frequency dependence of the vortex surface resistance of bulk niobium accelerating cavities as a function of different state-of-the-art surface treatments. Higher flux surface resistance per amount of trapped magnetic field—sensitivity—is observed for higher frequencies, in agreement with our theoretical model. Higher sensitivity is observed for N-doped cavities, which possess an intermediate value of the electron mean-free-path, compared to 120 °C and EP/BCP cavities. Experimental results from our study showed that the sensitivity has a non-monotonic trend as a function of the mean-free-path, including frequencies other than 1.3 GHz, and that the vortex response to the rf field can be tuned from the pinning regime to flux-flow regime by manipulating the frequency and/or the mean-free-path of the resonator, as reported in our previous studies. The frequency dependence of the trapped flux sensitivity to the amplitude of the accelerating gradient is also highlighted.</description><identifier>ISSN: 0003-6951</identifier><identifier>EISSN: 1077-3118</identifier><identifier>DOI: 10.1063/1.5016525</identifier><identifier>CODEN: APPLAB</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Applied physics ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; Computational fluid dynamics ; Dependence ; Flux ; Flux pinning ; Holes ; Niobium ; PARTICLE ACCELERATORS ; Sensitivity ; Surface resistance</subject><ispartof>Applied physics letters, 2018-02, Vol.112 (7)</ispartof><rights>Author(s)</rights><rights>2018 Author(s). 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Experimental results from our study showed that the sensitivity has a non-monotonic trend as a function of the mean-free-path, including frequencies other than 1.3 GHz, and that the vortex response to the rf field can be tuned from the pinning regime to flux-flow regime by manipulating the frequency and/or the mean-free-path of the resonator, as reported in our previous studies. The frequency dependence of the trapped flux sensitivity to the amplitude of the accelerating gradient is also highlighted.</description><subject>Applied physics</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>Computational fluid dynamics</subject><subject>Dependence</subject><subject>Flux</subject><subject>Flux pinning</subject><subject>Holes</subject><subject>Niobium</subject><subject>PARTICLE ACCELERATORS</subject><subject>Sensitivity</subject><subject>Surface resistance</subject><issn>0003-6951</issn><issn>1077-3118</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqd0E1LAzEQBuAgCtbqwX8Q9KSwNdlsdtObUqwKBcGPc8gmE0zRZE3SYv-9KS1495Jk4GFm8iJ0TsmEkpbd0AkntOU1P0AjSrquYpSKQzQihLCqnXJ6jE5SWpaS14yN0O08wvcKvN5gAwN4U56Ag8U5qmEAg-3n6gcn8Mllt3Z5g53Hry9zrFWpHKRTdGTVZ4Kz_T1G7_P7t9ljtXh-eJrdLSrNxDRXQoES5Wg441pMm7rrjWZtTWvRK2WMFbzpdWOV5lx1CiiANopbxYCa3ig2Rhe7viFlJ5N2GfSHDt6DzpI2jLQtKehyh4YYyq9Slsuwir7sJWtKuSiB8K262ikdQ0oRrByi-1JxIymR2xQllfsUi73e2e1ElV3w_8PrEP-gHIxlv_WxgI0</recordid><startdate>20180212</startdate><enddate>20180212</enddate><creator>Checchin, M.</creator><creator>Martinello, M.</creator><creator>Grassellino, A.</creator><creator>Aderhold, S.</creator><creator>Chandrasekaran, S. K.</creator><creator>Melnychuk, O. S.</creator><creator>Posen, S.</creator><creator>Romanenko, A.</creator><creator>Sergatskov, D. A.</creator><general>American Institute of Physics</general><general>American Institute of Physics (AIP)</general><scope>AJDQP</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OIOZB</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0001-8468-3328</orcidid><orcidid>https://orcid.org/0000-0002-2089-8685</orcidid><orcidid>https://orcid.org/0000-0003-1979-8721</orcidid><orcidid>https://orcid.org/0000000220898685</orcidid><orcidid>https://orcid.org/0000000319798721</orcidid><orcidid>https://orcid.org/0000000184683328</orcidid></search><sort><creationdate>20180212</creationdate><title>Frequency dependence of trapped flux sensitivity in SRF cavities</title><author>Checchin, M. ; Martinello, M. ; Grassellino, A. ; Aderhold, S. ; Chandrasekaran, S. K. ; Melnychuk, O. 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A.</au><aucorp>Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Frequency dependence of trapped flux sensitivity in SRF cavities</atitle><jtitle>Applied physics letters</jtitle><date>2018-02-12</date><risdate>2018</risdate><volume>112</volume><issue>7</issue><issn>0003-6951</issn><eissn>1077-3118</eissn><coden>APPLAB</coden><abstract>In this letter, we present the frequency dependence of the vortex surface resistance of bulk niobium accelerating cavities as a function of different state-of-the-art surface treatments. Higher flux surface resistance per amount of trapped magnetic field—sensitivity—is observed for higher frequencies, in agreement with our theoretical model. Higher sensitivity is observed for N-doped cavities, which possess an intermediate value of the electron mean-free-path, compared to 120 °C and EP/BCP cavities. Experimental results from our study showed that the sensitivity has a non-monotonic trend as a function of the mean-free-path, including frequencies other than 1.3 GHz, and that the vortex response to the rf field can be tuned from the pinning regime to flux-flow regime by manipulating the frequency and/or the mean-free-path of the resonator, as reported in our previous studies. The frequency dependence of the trapped flux sensitivity to the amplitude of the accelerating gradient is also highlighted.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.5016525</doi><tpages>4</tpages><orcidid>https://orcid.org/0000-0001-8468-3328</orcidid><orcidid>https://orcid.org/0000-0002-2089-8685</orcidid><orcidid>https://orcid.org/0000-0003-1979-8721</orcidid><orcidid>https://orcid.org/0000000220898685</orcidid><orcidid>https://orcid.org/0000000319798721</orcidid><orcidid>https://orcid.org/0000000184683328</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Applied physics CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS Computational fluid dynamics Dependence Flux Flux pinning Holes Niobium PARTICLE ACCELERATORS Sensitivity Surface resistance |
| title | Frequency dependence of trapped flux sensitivity in SRF cavities |
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