{"created":"2023-06-20T13:21:19.691948+00:00","id":1495,"links":{},"metadata":{"_buckets":{"deposit":"c0c04099-1cb3-4f43-aa02-b132d403bd90"},"_deposit":{"created_by":21,"id":"1495","owners":[21],"pid":{"revision_id":0,"type":"depid","value":"1495"},"status":"published"},"_oai":{"id":"oai:ir.soken.ac.jp:00001495","sets":["2:428:14"]},"author_link":["0","0","0"],"item_1_creator_2":{"attribute_name":"著者名","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"RUWALI, Kailash"}],"nameIdentifiers":[{"nameIdentifier":"0","nameIdentifierScheme":"WEKO"}]}]},"item_1_creator_3":{"attribute_name":"フリガナ","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"ルワリ, カイラシ"}],"nameIdentifiers":[{"nameIdentifier":"0","nameIdentifierScheme":"WEKO"}]}]},"item_1_date_granted_11":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2009-09-30"}]},"item_1_degree_grantor_5":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"総合研究大学院大学"}]}]},"item_1_degree_name_6":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（理学）"}]},"item_1_description_12":{"attribute_name":"要旨","attribute_value_mlt":[{"subitem_description":"　　　One of the most prominent applications of superconductivity is high field<br />magnet. Mechanical disturbance such as abrupt conductor motion is one of the main<br />origin of premature quench (transition from superconducting state to the normal<br />resistive state) in high current density superconducting coils. The wire motion occurs<br />when electromagnetic force to conductor exceeds constrain force including frictional<br />force on the surface of conductor. Behavior of superconducting wire motion depends<br />on the electromagnetic force acting on it, frictional property of the insulating material<br />and thrust force applied to the superconducting wire.<br />　　　The experiments for superconducting wire motion in magnetic field was<br />carried out using small coil wound on stainless steel (SUS) bobbin using Polyimide<br />film as an insulating material and high strength polyethylene fiber (Dyneema: DF)<br />reinforced plastic (DFRP) bobbin [1]. The Dyneema fiber has negative thermal<br />expansion [2] and low coefficient of friction [3]. It was found that voltage spikes<br />generated due to sudden wire motion in case of DFRP bobbin are a few and small in<br />amplitude. The speculations are; the negative thermal expansion of the DFRP bobbin<br />restrains the wire motion and low coefficient of friction between superconducting<br />wire and DFRP bobbin reduces sudden motion.<br />　　　In order to study the effect of frictional coefficient of insulating material on<br />superconducting wire motion under the influence of electromagnetic force, a special<br />experimental setup was designed and fabricated. The main distinctiveness of the<br />experimental setup is that the tension of the superconducting wire can be changed<br />during the experiments. The experimental set up consists of a cryostat,<br />superconducting solenoid magnet, sample holder, tensional unit to apply tension to<br />the superconducting wire, power supplies and pen recorder or a 16-bit data recorder<br />to measure the voltage tap signal. The sample holder consists of two parts, a semi-<br />circular head and a body part. Experiments were conducted at 4.2 K by varying the<br />experimental conditions such as the tension to the superconducting wire,<br />superconducting wire current ramp rate and different insulating materials at the<br />interface of the superconducting wire and semi-circular head. <br /><br />　　　Voltage taps to measure the signal generated due to the superconducting wire<br />motion are connected at the end of the semi-circular head. To reduce the voltage tap<br />loop area, a groove was incorporated in the semi-circular head and the voltage tap<br />wire was passed through it. The voltage tap signal is measured by a pen recorder or a<br />16-bit data recorder with a sampling rate of 1 MS/s. Sudden wire motion was<br />indicated by observing the voltage spikes. <br />　　　In order to examine the effect of the current ramp rate on the superconducting<br />wire motion, ramp rate was changed from 0.4 A/s to 1.69 A/s. The superconducting<br />wire tension was varied from 7.1 N to 35.8 N to study the effect of tension on the<br />superconducting wire motion. During all experiments, a constant magnetic field of 6<br />T was applied by superconducting solenoid magnet. <br />　　　In the thesis work, different types of insulating material were used to study<br />superconducting wire motion under electromagnetic force. They are Polyimide film,<br />cloth / sheet material fabricated using Dyneema fiber, Zylon fiber and Teflon. The<br />Dyneema / Zylon fiber has negative thermal expansion and a low coefficient of<br />friction.<br />　　　We have verified the effectiveness of this system. We could measure the<br />pattern of voltage spikes. The time duration of voltage spikes are of the same order<br />for all the samples. The peak voltage tap signal amplitude, velocity of wire motion,<br />distance moved by wire and energy dissipated due to wire motion in case of<br />Polyimide film is more than 2 order of magnitude larger than Dyneema based<br />insulating materials and Zylon cloth. Hence use of Dyneema / Zylon based materials<br />as an interface material between layers of superconducting wire may reduce the<br />frictional heat generated due to wire motion and could make superconducting magnet<br />performance more reliable.","subitem_description_type":"Other"}]},"item_1_description_18":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_1_description_7":{"attribute_name":"学位記番号","attribute_value_mlt":[{"subitem_description":"総研大甲第1280号","subitem_description_type":"Other"}]},"item_1_select_14":{"attribute_name":"所蔵","attribute_value_mlt":[{"subitem_select_item":"有"}]},"item_1_select_8":{"attribute_name":"研究科","attribute_value_mlt":[{"subitem_select_item":"高エネルギー加速器科学研究科"}]},"item_1_select_9":{"attribute_name":"専攻","attribute_value_mlt":[{"subitem_select_item":"12 加速器科学専攻"}]},"item_1_text_10":{"attribute_name":"学位授与年度","attribute_value_mlt":[{"subitem_text_value":"2009"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"RUWALI, Kailash","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"0","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-02-17"}],"displaytype":"simple","filename":"甲1280_要旨.pdf","filesize":[{"value":"174.3 kB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"要旨・審査要旨","url":"https://ir.soken.ac.jp/record/1495/files/甲1280_要旨.pdf"},"version_id":"2ef2a269-0501-40a5-a075-b549b3baa704"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-02-17"}],"displaytype":"simple","filename":"甲1280_本文.pdf","filesize":[{"value":"4.0 MB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"本文","url":"https://ir.soken.ac.jp/record/1495/files/甲1280_本文.pdf"},"version_id":"5abf1cc1-332c-486d-ba57-132c5cf2ee89"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"thesis","resourceuri":"http://purl.org/coar/resource_type/c_46ec"}]},"item_title":"Experimental study of superconducting wire motion on the base insulating material in magnetic field","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Experimental study of superconducting wire motion on the base insulating material in magnetic field"},{"subitem_title":"Experimental study of superconducting wire motion on the base insulating material in magnetic field","subitem_title_language":"en"}]},"item_type_id":"1","owner":"21","path":["14"],"pubdate":{"attribute_name":"公開日","attribute_value":"2010-06-09"},"publish_date":"2010-06-09","publish_status":"0","recid":"1495","relation_version_is_last":true,"title":["Experimental study of superconducting wire motion on the base insulating material in magnetic field"],"weko_creator_id":"21","weko_shared_id":-1},"updated":"2023-06-20T15:59:11.210823+00:00"}