{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,12]],"date-time":"2025-12-12T13:45:27Z","timestamp":1765547127415,"version":"3.41.2"},"reference-count":21,"publisher":"AIP Publishing","issue":"6","funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2017YFE0301106"],"award-info":[{"award-number":["2017YFE0301106"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["U21A20440","51821005"],"award-info":[{"award-number":["U21A20440","51821005"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2023,6,1]]},"abstract":"<jats:p>Plasma Position Reflectometry (PPR) is planned to provide plasma position and shape information for plasma operation in future fusion reactors. Its primary function is to calibrate the drift of the magnetic signals due to the integral nature of magnetic measurement. Here, we attempt to measure plasma position using ordinary mode (O-mode) and extraordinary mode (X-mode) reflectometry systems on two tokamaks. A new physical model based on the phase shift is proposed to deduce the relative movement of the cut-off layer without density inversion. We demonstrate the plasma position measurements by absolute measurement from density profile inversion and relative measurement from phase shift. The combination of X-mode and O-mode reflectometers can minimize the limitations of single polarization reflectometry and further increase the accuracy of plasma position measurement. These results could provide an important technical basis for the further development of a real-time control system based on PPR.<\/jats:p>","DOI":"10.1063\/5.0140390","type":"journal-article","created":{"date-parts":[[2023,6,24]],"date-time":"2023-06-24T09:47:51Z","timestamp":1687600071000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":6,"title":["Plasma position measurements by O-mode and X-mode reflectometry systems in tokamak plasmas"],"prefix":"10.1063","volume":"94","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4373-033X","authenticated-orcid":false,"given":"Y. Q.","family":"Shen","sequence":"first","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0043-7117","authenticated-orcid":false,"given":"Z. C.","family":"Yang","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4867-0631","authenticated-orcid":false,"given":"W. L.","family":"Zhong","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6884-8273","authenticated-orcid":false,"given":"M.","family":"Jiang","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7640-9844","authenticated-orcid":false,"given":"Z. B.","family":"Shi","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9329-2457","authenticated-orcid":false,"given":"J.","family":"Santos","sequence":"additional","affiliation":[{"name":"Associa\u00e7\u00e3o EURATOM\/IST, Instituto de Plasmas e Fus\u00e3o Nuclear\u2014Laborat\u00f3rio Associado, Instituto Superior T\u00e9cnico 2 , 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2071-7741","authenticated-orcid":false,"given":"P. W.","family":"Shi","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"}]},{"given":"R. H.","family":"Tong","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"}]},{"given":"G. Q.","family":"Xue","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"},{"name":"Key Laboratory of Materials Modification by Beams of the Ministry of Education, School of Physics, Dalian University of Technology 3 , Dalian 116024, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6945-6327","authenticated-orcid":false,"given":"Y.","family":"Zhou","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"},{"name":"Department of Engineering Physics, Tsinghua University 4 , Beijing 100084, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6645-3641","authenticated-orcid":false,"given":"J.","family":"Wen","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8690-4275","authenticated-orcid":false,"given":"X.","family":"Yu","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4782-1696","authenticated-orcid":false,"given":"W. C.","family":"Deng","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6480-7004","authenticated-orcid":false,"given":"S.","family":"Wang","sequence":"additional","affiliation":[{"name":"Southwestern Institute of Physics 1 , P.O. Box 432, Chengdu 610041, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9141-7869","authenticated-orcid":false,"given":"Z. J.","family":"Yang","sequence":"additional","affiliation":[{"name":"International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology 5 , Wuhan 430074, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8934-0364","authenticated-orcid":false,"given":"Z. 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