PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019)最新文献

{"title":"New thermo-plasma technology for selective 14C isotope extraction from irradiated reactor graphite","authors":"A. Petrovskaya, S. Surov, A. Kladkov, A. Tsyganov","doi":"10.1063/1.5135493","DOIUrl":"https://doi.org/10.1063/1.5135493","url":null,"abstract":"We propose new thermo-plasma technology for the selective extraction of the radioactive isotope 14C in the deactivation treatment of the irradiated reactor graphite surface. The proposed technology has several advantages compared with other decontamination methods as it provides effective extraction of highly radioactive nano-micro-size layer from the surfaces of the graphite bulk via cathode plasma inert ion sputtering and compact collecting of the radionuclides via diffusion to anode. Thus it avoids formation of the liquid secondary radioactive waste (“dry” technology), the method is relatively simple to implement and can be technically and economically effective. For the decontamination of the graphite surface and concentrate of 14C exploration under the heating and plasma sputtering, the design of the plasma spraying cell is described. One of the problem to be traversed in this way is the presence of a number of other radioactive isotopes which must be separated from 14C enriched final product. It may be reached by thermal separation of different atoms presenting in the irradiated graphite in accordance with their individual rates for condensation from inert gas to anode substrate. For this purpose plasma sputtering cell includes elongated ceramic heat insulator elements at the heated inert gas pumping out tube to provide a number of zones with different temperature for separate spatial condensation, as well as a vacuum thermal insulation of the anode (collector) for the maximum temperature zone. Model of energy release in this plasma discharge was considered, heat flux via and temperature of the cathode (sputtered surface) and the anode were estimated to ensure pure carbon condensation on the anode excluding other radionuclide impurities.We propose new thermo-plasma technology for the selective extraction of the radioactive isotope 14C in the deactivation treatment of the irradiated reactor graphite surface. The proposed technology has several advantages compared with other decontamination methods as it provides effective extraction of highly radioactive nano-micro-size layer from the surfaces of the graphite bulk via cathode plasma inert ion sputtering and compact collecting of the radionuclides via diffusion to anode. Thus it avoids formation of the liquid secondary radioactive waste (“dry” technology), the method is relatively simple to implement and can be technically and economically effective. For the decontamination of the graphite surface and concentrate of 14C exploration under the heating and plasma sputtering, the design of the plasma spraying cell is described. One of the problem to be traversed in this way is the presence of a number of other radioactive isotopes which must be separated from 14C enriched final product. It may...","PeriodicalId":176911,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127502133","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}

{"title":"Selective SiN/SiO2 etching by SF6/H2/Ar/He plasma","authors":"P. Pankratiev, Yuri Barsukov, A. Vinogradov, V. Volynets, A. Kobelev, A. Smirnov","doi":"10.1063/1.5135490","DOIUrl":"https://doi.org/10.1063/1.5135490","url":null,"abstract":"This paper presents the experimental data about SiN and SiO2 etching by SF6/H2/Ar/He plasma discharge. It has been shown that SiN etch rate increases if add small amount of He (less than 5 sccm) into the discharge. The SiO2 etch rate does not depend on He content in the plasma discharge and is almost the constant. The possible role of helium appears in reactions with H2 species. Namely, He or metastable He* increases rate of H-atoms production. It is known from the previous publications that H-atoms enhance SiN etching. Thus, helium can help to selectively etch silicon nitride over silicon oxide.This paper presents the experimental data about SiN and SiO2 etching by SF6/H2/Ar/He plasma discharge. It has been shown that SiN etch rate increases if add small amount of He (less than 5 sccm) into the discharge. The SiO2 etch rate does not depend on He content in the plasma discharge and is almost the constant. The possible role of helium appears in reactions with H2 species. Namely, He or metastable He* increases rate of H-atoms production. It is known from the previous publications that H-atoms enhance SiN etching. Thus, helium can help to selectively etch silicon nitride over silicon oxide.","PeriodicalId":176911,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019)","volume":"21 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120851515","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}

{"title":"The ELM triggering by sawtooth oscillations","authors":"V. Solokha, G. Kurskiev, M. Patrov, A. Yashin","doi":"10.1063/1.5135498","DOIUrl":"https://doi.org/10.1063/1.5135498","url":null,"abstract":"In the H-mode discharges with the neutral beam heating (NBI) in the Globus-M tokamak the sawtooth oscillations are triggering the edge localised modes (ELM) onset. The triggered ELMs have the magnetic oscillation precursor less than 0.2 ms before the onset with the typical island rotation frequency. The paper discussing the peeling-ballooning (P-B) destabilisation caused by the current density profile broadening due to partial reconnection.","PeriodicalId":176911,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123975582","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}

{"title":"Neutral beam stopping and shine-through calculations for fusion neutron source DEMO-FNS","authors":"E. Dlougach, B. Kuteev","doi":"10.1063/1.5135477","DOIUrl":"https://doi.org/10.1063/1.5135477","url":null,"abstract":"BTR code, which is generally used for NBI beamlines design and optimizations, is applied to calculate beam stopping and shine-through power in a fusion neutron source DEMO-FNS tokamak (R = 3.2m, a = 1m, k = 2, B = 5T, ED = 500keV, PNBI ≈ 30MW). Beam-plasma model applies the available cross-section fits and reproduces the detailed beam spatial and angular distributions (BTR standard beam) for different operation scenarios and calculates atomic power decay 3D-profiles, beam footprints and ions source distributions. The model is used to study the effect of injected beam geometry on the beam capture and shine-through power deposition.BTR code, which is generally used for NBI beamlines design and optimizations, is applied to calculate beam stopping and shine-through power in a fusion neutron source DEMO-FNS tokamak (R = 3.2m, a = 1m, k = 2, B = 5T, ED = 500keV, PNBI ≈ 30MW). Beam-plasma model applies the available cross-section fits and reproduces the detailed beam spatial and angular distributions (BTR standard beam) for different operation scenarios and calculates atomic power decay 3D-profiles, beam footprints and ions source distributions. The model is used to study the effect of injected beam geometry on the beam capture and shine-through power deposition.","PeriodicalId":176911,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019)","volume":"13 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120843550","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}

{"title":"Preface: Proceedings of the International Conference on Advances and Applications in Plasma Physics (AAPP 2019)","authors":"TendlerMichael, RozhanskyVladimir, GoncharovPavel, KravchukAnna","doi":"10.1063/1.5135473","DOIUrl":"https://doi.org/10.1063/1.5135473","url":null,"abstract":"","PeriodicalId":176911,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115677463","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}

{"title":"Energy release in Be, C and W due to irradiation with D and T atoms","authors":"D. Meluzova, P. Babenko, M. Mironov, V. S. Mikhailov, A. Shergin, A. Zinoviev","doi":"10.1063/1.5135491","DOIUrl":"https://doi.org/10.1063/1.5135491","url":null,"abstract":"The distribution of the energy release over the depth of the material was calculated for hydrogen isotopes bombarding beryllium, carbon and tungsten surfaces. It was shown that for energies less than 50 keV the maximum energy release occurs near the surface. The distribution of the energy release over depth was calculated for the energy spectra of neutral particles typical for the ITER tokamak-reactor. Obtained data makes it possible to estimate the heating of the near-surface layers when the walls are bombarded by atoms leaving the plasma. The accumulation of tritium in the surface layers is predicted.The distribution of the energy release over the depth of the material was calculated for hydrogen isotopes bombarding beryllium, carbon and tungsten surfaces. It was shown that for energies less than 50 keV the maximum energy release occurs near the surface. The distribution of the energy release over depth was calculated for the energy spectra of neutral particles typical for the ITER tokamak-reactor. Obtained data makes it possible to estimate the heating of the near-surface layers when the walls are bombarded by atoms leaving the plasma. The accumulation of tritium in the surface layers is predicted.","PeriodicalId":176911,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134255904","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}

{"title":"Formation of nanographite flakes on SiO2 substrate by plasma deposition of carbon and subsequent annealing","authors":"E. P. Neustroev, V. Popov, A. R. Prokopiev, Z. Davydova, S. O. Semenov","doi":"10.1063/1.5135492","DOIUrl":"https://doi.org/10.1063/1.5135492","url":null,"abstract":"The effect of plasma treatment in methane and the subsequent heat treatment of silicon dioxide substrates is studied. At the first stage, carbon film was deposited in an inductively coupled plasma on the surface of a SiO2 substrate. The Raman spectra of the deposited film contained a broad photoluminescence band in the range from 1000 to 3500 cm−1, corresponding to amorphous carbon. The deposited films contained hydrogen and oxygen. In the second stage of the process, the obtained films were heat treated at 650 °C in an argon atmosphere during at a 30 min. As a result, a film several nanometers thick remains on the surface of the substrate. Raman spectra show the peaks characteristic of nanocrystalline graphite. Measurements of the carrier mobility in a film using the Hall effect method showed a value of ∼250 cm2V−1s−1. It was established from the temperature dependences of resistances that the mechanism of electrical conductivity corresponds to the model of a Efros–Shklovskii variable range hopping mechanism. The sizes of graphite nanocrystals determined from the temperature dependences of resistances are approximately equal to 3 nm.The effect of plasma treatment in methane and the subsequent heat treatment of silicon dioxide substrates is studied. At the first stage, carbon film was deposited in an inductively coupled plasma on the surface of a SiO2 substrate. The Raman spectra of the deposited film contained a broad photoluminescence band in the range from 1000 to 3500 cm−1, corresponding to amorphous carbon. The deposited films contained hydrogen and oxygen. In the second stage of the process, the obtained films were heat treated at 650 °C in an argon atmosphere during at a 30 min. As a result, a film several nanometers thick remains on the surface of the substrate. Raman spectra show the peaks characteristic of nanocrystalline graphite. Measurements of the carrier mobility in a film using the Hall effect method showed a value of ∼250 cm2V−1s−1. It was established from the temperature dependences of resistances that the mechanism of electrical conductivity corresponds to the model of a Efros–Shklovskii variable range hopping mecha...","PeriodicalId":176911,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019)","volume":"355 Pt 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133926680","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}

{"title":"Lightning-shaped current impact on composite material surface fracture","authors":"Yuri E. Adamyan, Y. Bocharov, I. S. Kolodkin, A. Kolychev, S. Krivosheev, S. Magazinov","doi":"10.1063/1.5135487","DOIUrl":"https://doi.org/10.1063/1.5135487","url":null,"abstract":"","PeriodicalId":176911,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131803555","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}

{"title":"Measurements of relative erosion rate of ceramic insulators in Hall thruster with external layer using low-temperature plasma spectral analysis","authors":"D. Kravchenko, Dariya Kriviruchko, A. Shashkov, I. Khmelevskoi","doi":"10.1063/1.5135486","DOIUrl":"https://doi.org/10.1063/1.5135486","url":null,"abstract":"","PeriodicalId":176911,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129043555","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}

{"title":"Electroplasmic processing of coal flotation waste into organo-mineral sorbents for wastewater treatment","authors":"A. Kondratenko, S. Buyantuev, S. Shishulkin, I. Starinsky","doi":"10.1063/1.5135484","DOIUrl":"https://doi.org/10.1063/1.5135484","url":null,"abstract":"","PeriodicalId":176911,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019)","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134285855","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}