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  1. 020 学位論文
  2. 高エネルギー加速器科学研究科
  3. 12 加速器科学専攻

Experimental study of superconducting wire motion on the base insulating material in magnetic field

https://ir.soken.ac.jp/records/1495
https://ir.soken.ac.jp/records/1495
bd2d9a34-a7d5-4403-a186-5e1ee1fafd2e
名前 / ファイル ライセンス アクション
甲1280_要旨.pdf 要旨・審査要旨 (174.3 kB)
甲1280_本文.pdf 本文 (4.0 MB)
Item type 学位論文 / Thesis or Dissertation(1)
公開日 2010-06-09
タイトル
タイトル Experimental study of superconducting wire motion on the base insulating material in magnetic field
タイトル
タイトル Experimental study of superconducting wire motion on the base insulating material in magnetic field
言語 en
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_46ec
資源タイプ thesis
著者名 RUWALI, Kailash

× RUWALI, Kailash

RUWALI, Kailash

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フリガナ ルワリ, カイラシ

× ルワリ, カイラシ

ルワリ, カイラシ

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著者 RUWALI, Kailash

× RUWALI, Kailash

en RUWALI, Kailash

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学位授与機関
学位授与機関名 総合研究大学院大学
学位名
学位名 博士(理学)
学位記番号
内容記述タイプ Other
内容記述 総研大甲第1280号
研究科
値 高エネルギー加速器科学研究科
専攻
値 12 加速器科学専攻
学位授与年月日
学位授与年月日 2009-09-30
学位授与年度
値 2009
要旨
内容記述タイプ Other
内容記述 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.
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