電気学会論文誌A(基礎・材料・共通部門誌)
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
142 巻, 5 号
選択された号の論文の14件中1~14を表示しています
特集:量子コンピュータ周辺回路としての低温デジタル回路
巻頭言
特集解説論文
特集論文
  • Hongxiang Shen, Naoki Takeuchi, Yuki Yamanashi, Nobuyuki Yoshikawa
    2022 年 142 巻 5 号 p. 197-201
    発行日: 2022/05/01
    公開日: 2022/05/01
    ジャーナル 認証あり

    We are developing a microwave pulse generator, whose pulse width and amplitude can be arbitrarily controlled, to manipulate superconducting quantum computing systems. The proposed microwave pulse generator is made using superconducting circuits. It can be placed at a 4.2 K or lower temperature stages to control a large-scale quantum computing system effectively. One of the key components of the microwave pulse generator is the timing controller, which generates trigger pulses for the microwave switch to start and stop the microwave irradiation. The target frequency of the microwave is 5 GHz, and the timing controller has to generate trigger pulses with a time resolution of several nanoseconds. We designed a 4-bit timing controller using an adiabatic quantum flux parametron (AQFP) circuit, which is extremely energy-efficient superconducting logic. The designed timing controller derives two trigger pulses, start and stop, to the microwave switch at the timing designated by digital data. We implemented the AQFP timing controller using the AIST HSTP process and demonstrated its operation at 1 GHz. Its power dissipation was estimated as about 1.25×10-9 W at 1 GHz.

論文
  • 内田 篤, 佐々木 徹, 菊池 崇志, 高橋 一匡
    2022 年 142 巻 5 号 p. 202-207
    発行日: 2022/05/01
    公開日: 2022/05/01
    ジャーナル 認証あり

    The application of silicone water repellents to hydrophobic coatings by atmospheric pressure plasma (APP) generated by dielectric barrier discharge (DBD) was investigated. We compared the effects of silicone water repellent on hydrophobic coatings, the input energy density estimated from the voltage-current waveform, and the excitation temperature from the argon line of the measured optical emission spectrum. Hexamethyldisiloxane (HMDSO), KF-96 or KF-99, mixed with argon gas, was supplied as a silicone water repellent to the DBD reactor. The results showed that the irradiated samples became hydrophobic in all cases. Comparing the contact angles of these samples, the contact angle using KF-96 plasma became highly hydrophobic faster than the other conditions. The input power densities to the plasma were about 20 mW/cm2 for KF-96 and KF-99, and 80-110 mW/cm2 for HMDSO. The excitation temperature of argon was 0.9 eV for KF-99, 1 eV for KF-96, and 1.3-2 eV for HMDSO. It reveals that KF-96 is a better silicone water repellent on hydrophobic and input power density than HMDSO.

  • 竹之内 将, 善田 優希, 小迫 雅裕, 匹田 政幸, 藤本 信貴, 林坂 徳之, 加藤 俊彦, 菊池 英行
    2022 年 142 巻 5 号 p. 208-214
    発行日: 2022/05/01
    公開日: 2022/05/01
    ジャーナル 認証あり

    This paper presents partial discharge characteristics and film thickness wear till dielectric breakdown under bipolar repetitive impulse voltage application to twisted pair enamel wire added with nano-size boehmite to polyimide (PI) resin by comparing with a sample without the addition. The frequency acceleration equivalence of the life time and PD characteristics till breakdown is also examined. As a result, it was found that at frequencies 10 kHz to 30 kHz, a frequency acceleration equivalence held in terms of the total amount of PD charge at an applied voltage Va = 1.5 kV, while it did not at Va = 3.0 kV due to severer heat generated by PD. In addition, it was found that the coating thickness erosion of boehmite PI was less likely to be caused than that of neat PI under the same experimental conditions. Consequently, it is indicated that the total PD charge amount is closely related with the coating erosion speed.

  • 前田 孝夫, 山野 芳昭
    2022 年 142 巻 5 号 p. 215-220
    発行日: 2022/05/01
    公開日: 2022/05/01
    ジャーナル 認証あり

    The method to obtain the surface resistivity of insulating materials is standardized by IEC62631-3-2, where four types of line-electrode systems are presented. We have verified the effectiveness of the line-electrode using insulating materials with and without antistatic agent. It is clarified that two types of guard electrodes, edge guard and 2-part back guard, are useful to obtain the resistivity with reliability.

  • 和田 英男, 扶川 泰斗, 豊田 和晃, 小池 一歩, 河原 正美
    2022 年 142 巻 5 号 p. 221-228
    発行日: 2022/05/01
    公開日: 2022/05/01
    ジャーナル 認証あり

    Nb or Ta doped vanadium dioxide (VO2) thin films were grown on r-plane sapphire substrates by a metal-organic decomposition (MOD) method. Their crystallinities of the VO2 thin films were evaluated by XRD, AFM and XPS. It was clarified that polycrystalline fine particles having a moth-eye structure were grown and Nb or Ta ions were gradually replaced by V sites in all the samples. Moreover, it was found that the phase transition temperature measured by a spectrometer indicated 61-39°C for Nb doped samples and 57-47°C for Ta doped samples by doping from 1 to 3 mol%. The change in transmittance before and after the phase transition temperature tended to widen the transition temperature range as the doping concentration increases due to the gradual phase transition change. It was considered that the dopant of Nb or Ta ions added to replace V sites had an effective role on changing the phase transition phenomenon of VO2. Furthermore, FDTD simulation for nanoscale porous moth-eye structure VO2 thin films was carried out to compare with the data measured by a spectrometer, and it was in good agreement.

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