Pub Date : 2004-09-27DOI: 10.1109/DEIV.2004.1418628
A. Anders
Cathode spot operation is initiated by a thermal rnnway process of an electron emission site, leading to explosive destruction of the site. Arcs are based on cyclic processes, and perpetual ignition of spots is critical. By considering the probability of ignition as depending on surface condition and field enhancement, many properties of arc spots such as spot type, plasma composition, voltage fluctnations, etc. can be consistently described. The actual surface field and ignition probability is mainly determined by local field enhancement whose nature is very different for "contaminated" and "dean" surfaces. The azimuthal symmetry of ignition probability is broken when a transverse niagnetic field is applied.
{"title":"Cathodic are spots: Ignition probability as a a fundamental concept to describe spot types, phases, and motion","authors":"A. Anders","doi":"10.1109/DEIV.2004.1418628","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418628","url":null,"abstract":"Cathode spot operation is initiated by a thermal rnnway process of an electron emission site, leading to explosive destruction of the site. Arcs are based on cyclic processes, and perpetual ignition of spots is critical. By considering the probability of ignition as depending on surface condition and field enhancement, many properties of arc spots such as spot type, plasma composition, voltage fluctnations, etc. can be consistently described. The actual surface field and ignition probability is mainly determined by local field enhancement whose nature is very different for \"contaminated\" and \"dean\" surfaces. The azimuthal symmetry of ignition probability is broken when a transverse niagnetic field is applied.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134447923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/DEIV.2004.1418651
A. Andreev
The movement of electrons in the neighborhood of a cathode spat cell is considered. The cell current is a pulse with a rising-up part and a descending part of about 5.10-9s time duration each. This current generates the magnetic field around the cell. During these rising-up and descending current stages, electric fields with an amplitude up to 3.5.107 V/cm are induced in the neighborhood of the cell. Thus, around the cell, near the cathode surface, the crossed fields E x B are building up which amplitudes become lower with the increase of a distance from the cell center, approximately as 1IR. Under the action of electric fields the currents become to flow along the whole perimeter of a cell current channel. These currents are in some aspect similar to halo-currents arising in the plasma of tokamak during a pulsed ohmic current. When the cell current grows, the ¿halo¿ currents are directed oppositely to the cell current, i.e. electrons are moving to the cathode and ions are accelerated to the anode. When the cell current decreases, the induced electric field causes an antoelectronic emission from the cathode surface. The emitted electrons move along cycloids in the direction to the cell center making the gas desorption and building up the near-surface plasma (aureole) around the cell. Within the framework of this model it is possible to explain qualitatively many observed experimental facts: appearance of a weak glow around the cathode spot, division of cathode spots, the spot motion in the tangential magnetic field, etc.
本文考虑了阴极口槽附近电子的运动。细胞电流是一个脉冲，其上升部分和下降部分各约为5.10-9秒的持续时间。这种电流在电池周围产生磁场。在这些上升和下降的电流阶段，在电池附近产生振幅高达3.5.107 V/cm的电场。因此，在电池周围，靠近阴极表面，交叉场E x B正在形成，其振幅随着离电池中心距离的增加而降低，大约为1IR。在电场的作用下，电流开始沿着细胞电流通道的整个周长流动。这些电流在某些方面类似于托卡马克等离子体在脉冲欧姆电流中产生的晕流。当电池电流增长时，“晕”电流的方向与电池电流相反，即电子向阴极移动，离子加速向阳极移动。当电池电流减小时，感应电场引起阴极表面的反电子发射。发射的电子沿着摆线向细胞中心方向移动，使气体解吸，并在细胞周围形成近表面等离子体(光圈)。在这个模型的框架内，可以定性地解释许多观察到的实验事实:阴极光斑周围微弱辉光的出现、阴极光斑的划分、光斑在切向磁场中的运动等。
{"title":"Once again about a cathode spot of the vacuum arc","authors":"A. Andreev","doi":"10.1109/DEIV.2004.1418651","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418651","url":null,"abstract":"The movement of electrons in the neighborhood of a cathode spat cell is considered. The cell current is a pulse with a rising-up part and a descending part of about 5.10-9s time duration each. This current generates the magnetic field around the cell. During these rising-up and descending current stages, electric fields with an amplitude up to 3.5.107 V/cm are induced in the neighborhood of the cell. Thus, around the cell, near the cathode surface, the crossed fields E x B are building up which amplitudes become lower with the increase of a distance from the cell center, approximately as 1IR. Under the action of electric fields the currents become to flow along the whole perimeter of a cell current channel. These currents are in some aspect similar to halo-currents arising in the plasma of tokamak during a pulsed ohmic current. When the cell current grows, the ¿halo¿ currents are directed oppositely to the cell current, i.e. electrons are moving to the cathode and ions are accelerated to the anode. When the cell current decreases, the induced electric field causes an antoelectronic emission from the cathode surface. The emitted electrons move along cycloids in the direction to the cell center making the gas desorption and building up the near-surface plasma (aureole) around the cell. Within the framework of this model it is possible to explain qualitatively many observed experimental facts: appearance of a weak glow around the cathode spot, division of cathode spots, the spot motion in the tangential magnetic field, etc.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122537381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/DEIV.2004.1418660
K. K. Zabello, Y. Barinov, A. A. Logatchev, S. Shkol’nik
The study dealt with the cathode spot (CS) motion and the burning voltage of a low-current vacuum arc with electrodes of composition CuCr30, subjected to a magnetic field. The arcs with current 25 ≪ I ≪ 35 A burned in longitudinal (normal to the cathode surface) and transversal (tangential) fields as well as in those with the induction vector inclined by angle 5° ≪ ϕ ≪ 65° to the cathode surface. Use was made of electrodes with diameter 30 mm and gap 4 mm. The field components, longitudinal Bn, and transversal Br, varied independently in the range from 0 to 0.12T each. The superposition of the transversal magnetic field on the arc has been found to considerably increase both the constant component and noise level of the voltage. If such arc is superposed also with the longitudinal field, both the constant component and noise level decrease and at Bn ˜ Br, the voltage across the arc is weakly dependent of Br. The velocity of the retrograde (anti-Ampere) CS motion grows approximately in proportion to the growth of the transversal field induction. The proportionality factor is ˜200 m/(s.T). The increase in the longitudinal field induction causes a reduction in the magnitude of the velocity vector and its rotation with respect to the anti-Ampere direction through angle θ, its value being proportional to field inclination angle ϕ. The results obtained were compared with the data in references.
{"title":"Cathode spot motion and burning voltage of low current vacuum arc with electrodes of copper-chromium composition in magnetic field","authors":"K. K. Zabello, Y. Barinov, A. A. Logatchev, S. Shkol’nik","doi":"10.1109/DEIV.2004.1418660","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418660","url":null,"abstract":"The study dealt with the cathode spot (CS) motion and the burning voltage of a low-current vacuum arc with electrodes of composition CuCr30, subjected to a magnetic field. The arcs with current 25 ≪ I ≪ 35 A burned in longitudinal (normal to the cathode surface) and transversal (tangential) fields as well as in those with the induction vector inclined by angle 5° ≪ ϕ ≪ 65° to the cathode surface. Use was made of electrodes with diameter 30 mm and gap 4 mm. The field components, longitudinal Bn, and transversal Br, varied independently in the range from 0 to 0.12T each. The superposition of the transversal magnetic field on the arc has been found to considerably increase both the constant component and noise level of the voltage. If such arc is superposed also with the longitudinal field, both the constant component and noise level decrease and at Bn ˜ Br, the voltage across the arc is weakly dependent of Br. The velocity of the retrograde (anti-Ampere) CS motion grows approximately in proportion to the growth of the transversal field induction. The proportionality factor is ˜200 m/(s.T). The increase in the longitudinal field induction causes a reduction in the magnitude of the velocity vector and its rotation with respect to the anti-Ampere direction through angle θ, its value being proportional to field inclination angle ϕ. The results obtained were compared with the data in references.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128165289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/DEIV.2004.1418614
Ma Mingyan, Jinghe Zhong, Fan Yong, Zhenhao Jin
In this article, nano-doped polyimide/Silica (PI/SiO2) film was successfully prepared by the hydrolysis and condensation of methyl-triethoxysilane (MTEOS) that served as the precursor of the inorganic moiety and produced the nano-particle of silica in-situ in the polyamic acid (PAA) solution through sol-gel process. The chemical structure of the film was characterized by FTIR. The water absorbability and the dielectric properties including dielectric constant E and dielectric loss tg of the films were investigated with SiO2 content. And E and tg θ of the films were, further, compared heforeafter the films were immersed in deionized water for 24 hours respectively. On the other hand, a certain kind of coupling agent was added in order to improve the compatibility. It turned out that the properties of the nano-doped materials were not only relative to the inorganic component content of the system, but also to the morphology of the phases and the character of interface. The water absorbability of the films decreased with SiO2 content. And E and tg θof the films after immersed in water increased than those of the films before the immersion.
{"title":"Effects of inorganic component content on water absorbability and dielectric properties of the doped polyimide film","authors":"Ma Mingyan, Jinghe Zhong, Fan Yong, Zhenhao Jin","doi":"10.1109/DEIV.2004.1418614","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418614","url":null,"abstract":"In this article, nano-doped polyimide/Silica (PI/SiO2) film was successfully prepared by the hydrolysis and condensation of methyl-triethoxysilane (MTEOS) that served as the precursor of the inorganic moiety and produced the nano-particle of silica in-situ in the polyamic acid (PAA) solution through sol-gel process. The chemical structure of the film was characterized by FTIR. The water absorbability and the dielectric properties including dielectric constant E and dielectric loss tg of the films were investigated with SiO2 content. And E and tg θ of the films were, further, compared heforeafter the films were immersed in deionized water for 24 hours respectively. On the other hand, a certain kind of coupling agent was added in order to improve the compatibility. It turned out that the properties of the nano-doped materials were not only relative to the inorganic component content of the system, but also to the morphology of the phases and the character of interface. The water absorbability of the films decreased with SiO2 content. And E and tg θof the films after immersed in water increased than those of the films before the immersion.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114992250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/DEIV.2004.1418601
H. C. Miller
The history of the first 40 years of the International Symposia on Discharges and Electrical Insulation in Vacuum (ISDEIV) is discussed by a participant in the First symposium, held in Cambridge, USA in 1964. Some details of individual symposia will be given, as well as comments on changes in the symposia.
{"title":"History of the ISDEIV","authors":"H. C. Miller","doi":"10.1109/DEIV.2004.1418601","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418601","url":null,"abstract":"The history of the first 40 years of the International Symposia on Discharges and Electrical Insulation in Vacuum (ISDEIV) is discussed by a participant in the First symposium, held in Cambridge, USA in 1964. Some details of individual symposia will be given, as well as comments on changes in the symposia.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132083488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/DEIV.2004.1418606
Y. Yamano, S. Kobayashi, V. Saito
Outgassing from an electrode is regarded as one of factors leading electrical breakdowns in vacuum. It was already reported that oxidation treatment 200°C for titanium is effective to reduce outgassing because of its thin and fine oxide layer created on the surface. Breakdown characteristics of titanium electrodes with different oxidation conditions (without oxidation. with oxidation at 200°C and 450°C) were investigated and compared, in order to clarify the dependence of the oxidation treatment on the breakdown characteristics. In addition, chemical composition on the electrode surface was analyzed by X-ray Photoelectron Spectroscopy (XPS) before and after 500 repetitive breakdowns. Experiments clarified that breakdown field at the first voltage application is highest and conditioning effect is significant for the electrodes at 200°C oxidation.
{"title":"Vacuum electrical breakdown characteristics and surface chemical compositions of titanium electrodes with oxidation conditions","authors":"Y. Yamano, S. Kobayashi, V. Saito","doi":"10.1109/DEIV.2004.1418606","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418606","url":null,"abstract":"Outgassing from an electrode is regarded as one of factors leading electrical breakdowns in vacuum. It was already reported that oxidation treatment 200°C for titanium is effective to reduce outgassing because of its thin and fine oxide layer created on the surface. Breakdown characteristics of titanium electrodes with different oxidation conditions (without oxidation. with oxidation at 200°C and 450°C) were investigated and compared, in order to clarify the dependence of the oxidation treatment on the breakdown characteristics. In addition, chemical composition on the electrode surface was analyzed by X-ray Photoelectron Spectroscopy (XPS) before and after 500 repetitive breakdowns. Experiments clarified that breakdown field at the first voltage application is highest and conditioning effect is significant for the electrodes at 200°C oxidation.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"96 16","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113944033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/DEIV.2004.1418609
S. Barengolts, N. Kazarinov, G. Mesyats, E. Perelshtein, V.F. Shevisov
This paper presents the results of a numerical simulation of the process of formation of a nonstationary well in the gap between the front of the cathode flare and the anode taking into account the floating potential at the boundary of the expanding plasma. It has been shown that in a vacuum diode a potential well can form whose lifetime lies on the nanosecond scale. Based on the results obtained, an explanation is given to the effect of collective acceleration of ions in a vacuum spark discharge.
{"title":"Triode model of a deep potential well in a vacuum diode","authors":"S. Barengolts, N. Kazarinov, G. Mesyats, E. Perelshtein, V.F. Shevisov","doi":"10.1109/DEIV.2004.1418609","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418609","url":null,"abstract":"This paper presents the results of a numerical simulation of the process of formation of a nonstationary well in the gap between the front of the cathode flare and the anode taking into account the floating potential at the boundary of the expanding plasma. It has been shown that in a vacuum diode a potential well can form whose lifetime lies on the nanosecond scale. Based on the results obtained, an explanation is given to the effect of collective acceleration of ions in a vacuum spark discharge.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132370838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/DEIV.2004.1418596
V. N. Shrednik, O. L. Golubev, M. V. Loginov
In the work the results of studying of field evaporation of some metals, alloys and compounds are analyzed for use of these results for creation of the point sources of electrons and ions. The processes of field evaporation at temperatures are higher room have complicated character owing to complicated character of change of the form of the emitter during evaporation and change of the composition of a surface of the emitter. Field evaporation at various temperatures allows to create the emitters of various ions, both atomic, and molecular or even cluster. Varying modes of evaporation, it is possible to obtain currents of the charged particles, of various composition and localization on a surfaces of an emitter.
{"title":"Field evaporation of metals, alloys and compounds as a base for creation of point ion sources for nanotechnology","authors":"V. N. Shrednik, O. L. Golubev, M. V. Loginov","doi":"10.1109/DEIV.2004.1418596","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418596","url":null,"abstract":"In the work the results of studying of field evaporation of some metals, alloys and compounds are analyzed for use of these results for creation of the point sources of electrons and ions. The processes of field evaporation at temperatures are higher room have complicated character owing to complicated character of change of the form of the emitter during evaporation and change of the composition of a surface of the emitter. Field evaporation at various temperatures allows to create the emitters of various ions, both atomic, and molecular or even cluster. Varying modes of evaporation, it is possible to obtain currents of the charged particles, of various composition and localization on a surfaces of an emitter.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128584266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/DEIV.2004.1418646
K. Arai, S. Takahashi, O. Morimiya, Y. Niwa, M. Honma
The steady state characteristics of a magnetically stabilized high current vacuum arc were analyzed, taking into account the electron density dependent electrical conductivity anisotropy due to a magnetic field. A marked difference in plasma characteristics between the case of isotropic conductivity and the case of anisotropy conductivity arises in the pressure balance of the arc column and in the axial current distribution. The electron density dependent anisotropy factor of Braginskii¿s theoretical formula and tentative mathematical formulas are discussed. The measured are pressure agreed well with the analytical value obtained from the tentative mathematical formula. A more critical analysis should be applied to the validity of Braginskii¿s formula.
{"title":"Effect of electrical conductivity anisotropy on the properties of a high-current vacuum arc","authors":"K. Arai, S. Takahashi, O. Morimiya, Y. Niwa, M. Honma","doi":"10.1109/DEIV.2004.1418646","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418646","url":null,"abstract":"The steady state characteristics of a magnetically stabilized high current vacuum arc were analyzed, taking into account the electron density dependent electrical conductivity anisotropy due to a magnetic field. A marked difference in plasma characteristics between the case of isotropic conductivity and the case of anisotropy conductivity arises in the pressure balance of the arc column and in the axial current distribution. The electron density dependent anisotropy factor of Braginskii¿s theoretical formula and tentative mathematical formulas are discussed. The measured are pressure agreed well with the analytical value obtained from the tentative mathematical formula. A more critical analysis should be applied to the validity of Braginskii¿s formula.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122323576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-09-27DOI: 10.1109/DEIV.2004.1418655
K. Tsuruta, M. Nakajima, M. Kitaura, T. Yanagidaira
Effect of magnetic fields on the instability of low current DC vacuum arcs, less than 10A, were examined experimentally. An axial magnetic field less than 100mT composed of a pair of disc magnets, an axial magnetic field by a solenoid coil in a range of 70 to 300mT, and an axial magnetic filed with a radial component by a disc magnet less than 40mT were used. It appeared that the arcs become unstable and the arc voltages rise by applying axial fields. As a result the lifetimes of the arcs rather decreased with increasing magnetic fields.
{"title":"Effect of magnetic field on sustainment of low-current DC vacuum arcs","authors":"K. Tsuruta, M. Nakajima, M. Kitaura, T. Yanagidaira","doi":"10.1109/DEIV.2004.1418655","DOIUrl":"https://doi.org/10.1109/DEIV.2004.1418655","url":null,"abstract":"Effect of magnetic fields on the instability of low current DC vacuum arcs, less than 10A, were examined experimentally. An axial magnetic field less than 100mT composed of a pair of disc magnets, an axial magnetic field by a solenoid coil in a range of 70 to 300mT, and an axial magnetic filed with a radial component by a disc magnet less than 40mT were used. It appeared that the arcs become unstable and the arc voltages rise by applying axial fields. As a result the lifetimes of the arcs rather decreased with increasing magnetic fields.","PeriodicalId":137370,"journal":{"name":"XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV.","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115173592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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