TY - GEN
T1 - The charge transport characteristics of polyimide under electron beam and dc voltage
AU - Li, Guochang
AU - Li, Shengtao
AU - Min, Daomin
AU - Pan, Shaoming
AU - Zhao, Changhao
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015/10/8
Y1 - 2015/10/8
N2 - Deposited charges in dielectric material under electron-beam radiation have an important influence on dc vacuum surface flashover. This paper investigates the charge transport characteristics of polyimide under electron-beam radiation and dc voltage. Based on the actual size of electrodes and polyimide, a physical model of electron-beam radiation is proposed. Considered the processes of charge deposition and transport and accumulation in polyimide radiated by low-energy electrons (electron energy: 5-30 keV, electron-beam density: 10-10 ∼10-7A/m2), the distributions of space charge, potential and electric field can be obtained, and the total electric field at cathode triple junction under the combined action of electron radiation and dc voltage are analyzed. The calculation results indicate that when the electron-beam density is less relatively (<10-9 A/m2), the weakening effect of built-in electric field on applied electric field is unobvious. With the increase of electronbeam density, the built-in electric field is gradually increased, resulting in the decrease of total electric field at the cathode triple junction. The total electric field is 8×105 V/m under the electronbeam density of 10-7 A/m2. It will reduce the initial electron emission at the cathode triple junction, and may enhance surface flashover voltage of dielectric material. Further experiment study will be carried out.
AB - Deposited charges in dielectric material under electron-beam radiation have an important influence on dc vacuum surface flashover. This paper investigates the charge transport characteristics of polyimide under electron-beam radiation and dc voltage. Based on the actual size of electrodes and polyimide, a physical model of electron-beam radiation is proposed. Considered the processes of charge deposition and transport and accumulation in polyimide radiated by low-energy electrons (electron energy: 5-30 keV, electron-beam density: 10-10 ∼10-7A/m2), the distributions of space charge, potential and electric field can be obtained, and the total electric field at cathode triple junction under the combined action of electron radiation and dc voltage are analyzed. The calculation results indicate that when the electron-beam density is less relatively (<10-9 A/m2), the weakening effect of built-in electric field on applied electric field is unobvious. With the increase of electronbeam density, the built-in electric field is gradually increased, resulting in the decrease of total electric field at the cathode triple junction. The total electric field is 8×105 V/m under the electronbeam density of 10-7 A/m2. It will reduce the initial electron emission at the cathode triple junction, and may enhance surface flashover voltage of dielectric material. Further experiment study will be carried out.
KW - charge transport characteristic
KW - dc voltage
KW - electron-beam radiation
KW - polyimide
UR - https://www.scopus.com/pages/publications/84962552169
U2 - 10.1109/ICPADM.2015.7295223
DO - 10.1109/ICPADM.2015.7295223
M3 - 会议稿件
AN - SCOPUS:84962552169
T3 - Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials
SP - 120
EP - 123
BT - ICPADM 2015 - 2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015
Y2 - 19 July 2015 through 22 July 2015
ER -