{"created":"2021-03-01T06:44:02.759901+00:00","id":8609,"links":{},"metadata":{"_buckets":{"deposit":"01a9fdaf-49b2-4691-a43a-071b11da4f28"},"_deposit":{"id":"8609","owners":[],"pid":{"revision_id":0,"type":"depid","value":"8609"},"status":"published"},"_oai":{"id":"oai:tsukuba.repo.nii.ac.jp:00008609","sets":["3:233:253"]},"author_link":["35429"],"item_12_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1995","bibliographicIssueDateType":"Issued"}}]},"item_12_date_granted_46":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"1995-03-23"}]},"item_12_degree_grantor_44":{"attribute_name":"学位授与大学","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"筑波大学"},{"subitem_degreegrantor_language":"en","subitem_degreegrantor_name":"University of Tsukuba"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"12102","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_12_degree_name_43":{"attribute_name":"取得学位","attribute_value_mlt":[{"subitem_degreename":"博士（物理学）"},{"subitem_degreename":"Doctor of Philosophy in Physics"}]},"item_12_description_14":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_12_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"This thesis describes investigations of the ion temperature,neutral particle density,and ion energy confinement in ICRF-heated plasmas in the central cell of the GAMMA10 tandem mirror on the basis of measurements of charge exchange neutral particles emitted from the plasma. A charge exchange neutral particle analyzer(CX-NPA) has been used for measuring the ion temperature in the central cell.Calibration experiments for the CX-NPA were carried out to confirm the characteristics of the analyzer,usiug a hydrogen ion source. In low density plasmas such as the GAMMA10 plasmas,it has been proved that the density profile of neutral hydrogen atoms estimated from the Hα emission is not consistent with that calculated by a neutral particle transport code (DEGAS).For solving this problem on the DEGAS code,the original DEGAS code was modified so as to take into account the dissociative-excitation processes of neutral hydrogen molecules.Furthermore,the conventional method for the estimation of the density of neutral hydrogen atoms from the Hα　emission is modified so as to take into consideration the direct Hα emission through the above processes.The density profile of neutral hydrogen atoms estimated from the Hα line intensity using this method agreed well with the calculated result by the modified DEGAS code.It was proved that the radial profile of neutral particles can be determined by the modified DEGAS code in low density plasmas. For the interpretation of the experimental results of the energy spectrum and the count-rate profile of the charge exchange neutral particles measured with the CX-NPA,the following three effects were newly included in the conventional method for obtaining the ion temperature radial profile;(1) the anisotropy of pitch angle distribution of ions,(2) charge exchange reaction with neutral hydrogen molecules,(3) ion finite Larmor radius.The experimental results were explained well using this improved method.This method may be applicable to the analysis of temperature of alpha particles with large Lamor radius in a fusion plasma. In the typical hot-ion mode plasmas,the radial profile of ion temperature was obtained by applying the above improved method.Using the radial profile of ion temperature and the other plasma parameters,the ion energy loss caused by the classical processes(electron drag,and charge exchange reactions) was calculated with taking into account of the effects of the ion finite Larmor radius and the anisotropy of the ion pith angle distribution.This calculation was applied to the ion energy loss in the non-steady state plasma.A simulation code was developed for investigating the time evolution of the ion energy balance including the above classical processes.This simulation results were compared with the results in the experiments where the ICRF power was decreased stepwise with various ICRF powers.On applying the ECRH for the heating of electrons,the significant increase of the diamagentism was observed in these experiments.The cause of the increase of the diamagnetism is discussed in this thesis by using the simulation code. The ICRF power dependence of the time evolution of the diamagnetism during the ICRF power decrease was examined.In the cases where the ICRF power were 90kW and 133kW,the time behaviors of the diamagnetism agreed well with the simulation results.This indicates that the ion energy loss is mainly explained by the classical processes.In the case where the ICRF power was 160kW,the diamagnetism saturated at about 7.0x10-5 Wb after the rapid increase of the diamagnetism during the ECRH.This indicates that the ion energy loss mechanism due to some non-classical processes,like an instability,may be taking place,and they should be taken into consideration in the analysis.For explaning the above discrepancy,the ion energy loss mechanism due to the ion thermal conduction was included in the simulation code.It is found that the time evolution of the diamagnetism can be explanied by the following two mechanisms:(1)a temporal change of the ICRF heating power;(2)the ion energy loss induced by the thermal conduction which increases with the diamagnetism.Further investigations,however,are required in order to clarify the responsible mechanism of the diamagnetism saturation. From the analysis of the ion temperature,it was shown that plasmas with the high ion temperature(-10keV) at the plasma center were achieved in high magnetic field strength experiments.The reason for the achievement of the high ion temperature is discussed from the viewpoint of the ion energy loss by the classical processes.The saturation of the diamagnetism was also observed in various magnetic field strength experiments when the ICRF power was increased.The ICRF power was increased stepwise when the diamagnetism saturated.From the analysis of ion temperature radial profile,no significant increase of the ion temperature in the plasma center,and the appreciable broadening of the ion temperature profile were observed during the higher ICRF power phase.While,no broadening of the ion temperature profile was observed under the low diamagnetism condition.The following two mechanisms can be considered as the cause of the broadening during the ICRF power increase at the diamagnetism saturation:(1) the change of the radial profile of the ICRF heating power,(2)the occurrence of the ion thermal conduction and convection. The diamagnetism degradation was observed in both the additional gas puffing experiments and the stepwise application of higher ICRF power experiment.The ion temperature analysis clarified that the appreciable decrease of the ion temperature near the plasma center occurred with the degradation of the diamagnetism.The degradation with the additional gas puffing will be discussed from the standpoint of the ion energy loss due to the charge exchange reactions,using the modified DEGAS code with including the axial variation of the neutral particle density.From the results of the systematic investigation on the diamagnetism degradation,the relationship between the maximum diamagnetism(ion temperature)and the plasma density profile in the central cell is also discussed.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_12_description_45":{"attribute_name":"学位授与年度","attribute_value_mlt":[{"subitem_description":"1994","subitem_description_type":"Other"}]},"item_12_dissertation_number_47":{"attribute_name":"報告番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第1358号"}]},"item_12_relation_37":{"attribute_name":"関係URI","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_language":"ja","subitem_relation_name_text":"本文はOPACにあり"}],"subitem_relation_type":"hasFormat","subitem_relation_type_id":{"subitem_relation_type_id_text":"https://www.tulips.tsukuba.ac.jp/opac/volume/650169","subitem_relation_type_select":"URI"}}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Shoji, Mamoru","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"35429","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2013-12-18"}],"displaytype":"detail","filename":"A1358.pdf","filesize":[{"value":"172.0 kB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"objectType":"abstract","url":"https://tsukuba.repo.nii.ac.jp/record/8609/files/A1358.pdf"},"version_id":"a550d74a-5928-4656-bef0-297ca151d30f"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"ガンマ10セントラル部におけるICRF加熱プラズマのイオンのエネルギー閉じ込め","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"ガンマ10セントラル部におけるICRF加熱プラズマのイオンのエネルギー閉じ込め","subitem_title_language":"ja"},{"subitem_title":"Ion energy containment of ICRF-heated plasmas in the GAMMA10 central cell","subitem_title_language":"en"}]},"item_type_id":"12","owner":"1","path":["253"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2007-07-25"},"publish_date":"2007-07-25","publish_status":"0","recid":"8609","relation_version_is_last":true,"title":["ガンマ10セントラル部におけるICRF加熱プラズマのイオンのエネルギー閉じ込め"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-04-28T06:27:02.130824+00:00"}