{"_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": ["14"]}, "author_link": ["0", "0", "0"], "item_1_biblio_info_21": {"attribute_name": "書誌情報（ソート用）", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2009-09-30", "bibliographicIssueDateType": "Issued"}, "bibliographic_titles": [{}]}]}, "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_1": {"attribute_name": "ID", "attribute_value_mlt": [{"subitem_description": "2009515", "subitem_description_type": "Other"}]}, "item_1_description_12": {"attribute_name": "要旨", "attribute_value_mlt": [{"subitem_description": "　　　One of the most prominent applications of superconductivity is high field\u003cbr /\u003emagnet. Mechanical disturbance such as abrupt conductor motion is one of the main\u003cbr /\u003eorigin of premature quench (transition from superconducting state to the normal\u003cbr /\u003eresistive state) in high current density superconducting coils. The wire motion occurs\u003cbr /\u003ewhen electromagnetic force to conductor exceeds constrain force including frictional\u003cbr /\u003eforce on the surface of conductor. Behavior of superconducting wire motion depends\u003cbr /\u003eon the electromagnetic force acting on it, frictional property of the insulating material\u003cbr /\u003eand thrust force applied to the superconducting wire.\u003cbr /\u003e　　　The experiments for superconducting wire motion in magnetic field was\u003cbr /\u003ecarried out using small coil wound on stainless steel (SUS) bobbin using Polyimide\u003cbr /\u003efilm as an insulating material and high strength polyethylene fiber (Dyneema: DF)\u003cbr /\u003ereinforced plastic (DFRP) bobbin [1]. The Dyneema fiber has negative thermal\u003cbr /\u003eexpansion [2] and low coefficient of friction [3]. It was found that voltage spikes\u003cbr /\u003egenerated due to sudden wire motion in case of DFRP bobbin are a few and small in\u003cbr /\u003eamplitude. The speculations are; the negative thermal expansion of the DFRP bobbin\u003cbr /\u003erestrains the wire motion and low coefficient of friction between superconducting\u003cbr /\u003ewire and DFRP bobbin reduces sudden motion.\u003cbr /\u003e　　　In order to study the effect of frictional coefficient of insulating material on\u003cbr /\u003esuperconducting wire motion under the influence of electromagnetic force, a special\u003cbr /\u003eexperimental setup was designed and fabricated. The main distinctiveness of the\u003cbr /\u003eexperimental setup is that the tension of the superconducting wire can be changed\u003cbr /\u003eduring the experiments. The experimental set up consists of a cryostat,\u003cbr /\u003esuperconducting solenoid magnet, sample holder, tensional unit to apply tension to\u003cbr /\u003ethe superconducting wire, power supplies and pen recorder or a 16-bit data recorder\u003cbr /\u003eto measure the voltage tap signal. The sample holder consists of two parts, a semi-\u003cbr /\u003ecircular head and a body part. Experiments were conducted at 4.2 K by varying the\u003cbr /\u003eexperimental conditions such as the tension to the superconducting wire,\u003cbr /\u003esuperconducting wire current ramp rate and different insulating materials at the\u003cbr /\u003einterface of the superconducting wire and semi-circular head. \u003cbr /\u003e\u003cbr /\u003e　　　Voltage taps to measure the signal generated due to the superconducting wire\u003cbr /\u003emotion are connected at the end of the semi-circular head. To reduce the voltage tap\u003cbr /\u003eloop area, a groove was incorporated in the semi-circular head and the voltage tap\u003cbr /\u003ewire was passed through it. The voltage tap signal is measured by a pen recorder or a\u003cbr /\u003e16-bit data recorder with a sampling rate of 1 MS/s. Sudden wire motion was\u003cbr /\u003eindicated by observing the voltage spikes. \u003cbr /\u003e　　　In order to examine the effect of the current ramp rate on the superconducting\u003cbr /\u003ewire motion, ramp rate was changed from 0.4 A/s to 1.69 A/s. The superconducting\u003cbr /\u003ewire tension was varied from 7.1 N to 35.8 N to study the effect of tension on the\u003cbr /\u003esuperconducting wire motion. During all experiments, a constant magnetic field of 6\u003cbr /\u003eT was applied by superconducting solenoid magnet. \u003cbr /\u003e　　　In the thesis work, different types of insulating material were used to study\u003cbr /\u003esuperconducting wire motion under electromagnetic force. They are Polyimide film,\u003cbr /\u003ecloth / sheet material fabricated using Dyneema fiber, Zylon fiber and Teflon. The\u003cbr /\u003eDyneema / Zylon fiber has negative thermal expansion and a low coefficient of\u003cbr /\u003efriction.\u003cbr /\u003e　　　We have verified the effectiveness of this system. We could measure the\u003cbr /\u003epattern of voltage spikes. The time duration of voltage spikes are of the same order\u003cbr /\u003efor all the samples. The peak voltage tap signal amplitude, velocity of wire motion,\u003cbr /\u003edistance moved by wire and energy dissipated due to wire motion in case of\u003cbr /\u003ePolyimide film is more than 2 order of magnitude larger than Dyneema based\u003cbr /\u003einsulating materials and Zylon cloth. Hence use of Dyneema / Zylon based materials\u003cbr /\u003eas an interface material between layers of superconducting wire may reduce the\u003cbr /\u003efrictional heat generated due to wire motion and could make superconducting magnet\u003cbr /\u003eperformance 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_16": {"attribute_name": "複写", "attribute_value_mlt": [{"subitem_select_item": "印刷物から複写可"}]}, "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", "download_preview_message": "", "file_order": 0, "filename": "甲1280_要旨.pdf", "filesize": [{"value": "174.3 kB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_11", "mimetype": "application/pdf", "size": 174300.0, "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", "download_preview_message": "", "file_order": 1, "filename": "甲1280_本文.pdf", "filesize": [{"value": "4.0 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_11", "mimetype": "application/pdf", "size": 4000000.0, "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"], "permalink_uri": "https://ir.soken.ac.jp/records/1495", "pubdate": {"attribute_name": "公開日", "attribute_value": "2010-06-09"}, "publish_date": "2010-06-09", "publish_status": "0", "recid": "1495", "relation": {}, "relation_version_is_last": true, "title": ["Experimental study of superconducting wire motion on the base insulating material in magnetic field"], "weko_shared_id": -1}