BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Divertor for steady-state GDT DTSTART;VALUE=DATE-TIME:20191118T084500Z DTEND;VALUE=DATE-TIME:20191118T090500Z DTSTAMP;VALUE=DATE-TIME:20260610T161321Z UID:indico-contribution-99-719@indico.inp.nsk.su DESCRIPTION:Speakers: Igor Kotelnikov (Budker INP)\nAn analysis is made of possibility of using a device topologically equivalent to a nonparaxial M HD stabilizer as a divertor for the projected ALIANCE source of fusion neu trons on the gas-dynamic trap\, which should operate in a continuous mode. A side effect of adding a divertor to a linear trap is the expected impro vement in plasma MHD stability\, which was previously observed at TARA [Ph ys. Fluids 31 (1988) 2009] and HIEI [Fus. Tech. 39 (2001) 350] facilities. To assess the effect of MHD stabilization by a divertor\, the article ind icates a method for finding stability rings\, and also calculates the degr ee of expansion of the plasma flux in the divertor. The analysis showed th at a good divertor\, which provides a high degree of expansion\, cannot be a good MHD stabilizer\, which provides a large margin of stability. The d ivertor configurations made up of two and three coils are studied\, their advantages and disadvantages are described. The final part of the article presents the calculations of the magnetic field in an end cell with a supe rconducting divertor designed for the GDMT gas-dynamic multi-core trap pro ject [Fus. Sci. Tech. 63 (2013) 46].\n\nhttps://indico.inp.nsk.su/event/19 /contributions/719/ LOCATION:Budker INP Conference Hall URL:https://indico.inp.nsk.su/event/19/contributions/719/ END:VEVENT BEGIN:VEVENT SUMMARY:Axial plasma confinement in open magnetic trap - experiments on GD T DTSTART;VALUE=DATE-TIME:20191118T074500Z DTEND;VALUE=DATE-TIME:20191118T080500Z DTSTAMP;VALUE=DATE-TIME:20260610T161321Z UID:indico-contribution-99-722@indico.inp.nsk.su DESCRIPTION:Speakers: Elena Soldatkina (BINP)\nThe presented work is part of the fundamental research on the implementation of a controlled thermonu clear reaction in open-type magnetic traps. The interest in such systems i s defined by the development of powerful neutron sources\, which are neces sary\, in particular\, to control hybrid fusion-fission reactors\, and\, w ith further development\, the creation of purely fusion reactors for energ y production. The main parameter from the applications point of view is th e energy efficiency of the system\, which rapidly increases with increasin g of electron temperature. One of the factors limiting the electron temper ature is the high thermal conductivity of the plasma along the magnetic fi eld lines\, which is determined by a number of complex kinetic processes i n the expanders — regions of the expanding magnetic flux behind the magn etic plugs. The main goal of the work is to study this loss channel in det ail and determine conditions under which these losses could be suppressed to levels acceptable for thermonuclear applications of mirror magnetic tra ps. All the experiments were performed on GDT [1] device in Budker Institu te of Nuclear Physics.\nIn previous work [2] experimental results describi ng the electric potential in the Debye layer near the surface of the plasm a absorber and the average electron energy along the longitudinal coordina te were presented. The present work is devoted to measuring of energy carr ied out from the trap by one ion-electron pair along the length of the exp ander using a set of probes namely pyroelectric bolometer and ion flux pro be. This dependence on the residual gas density in the expander tank has a lso been investigated. These data will make it possible to complete the th eoretical model currently being developed [3]\, which describes the kineti cs of processes in the expander of mirror trap.\n\n1. A. Ivanov and V. Pri khodko\, Plasma Phys. Controlled Fusion 55\, 063001 (2013).\n2. E. Soldatk ina\, et al. Physics of Plasmas 24\, 022505 (2017).\n3. D. Skovorodin\, Ph ysics of Plasmas 26\, 012503 (2019).\n\nhttps://indico.inp.nsk.su/event/19 /contributions/722/ LOCATION:Budker INP Conference Hall URL:https://indico.inp.nsk.su/event/19/contributions/722/ END:VEVENT BEGIN:VEVENT SUMMARY:Axial confinement of electrons in mirror trap with expander divert or DTSTART;VALUE=DATE-TIME:20191118T072500Z DTEND;VALUE=DATE-TIME:20191118T074500Z DTSTAMP;VALUE=DATE-TIME:20260610T161321Z UID:indico-contribution-99-725@indico.inp.nsk.su DESCRIPTION:Speakers: Dmitriy Skovorodin (BINP)\nAxial confinement of elec trons in mirror trap was studied. The formation of electrostatic potential in expander divertors was examined. The numerical simulations was used to verify the theoretical estimations. The influence of secondary emission o f cold electrons from end plate on plasma confinement was studied.\n\nhttp s://indico.inp.nsk.su/event/19/contributions/725/ LOCATION:Budker INP Conference Hall URL:https://indico.inp.nsk.su/event/19/contributions/725/ END:VEVENT BEGIN:VEVENT SUMMARY:Electron-cyclotron and electron-beam plasma startup DTSTART;VALUE=DATE-TIME:20191118T080500Z DTEND;VALUE=DATE-TIME:20191118T082500Z DTSTAMP;VALUE=DATE-TIME:20260610T161321Z UID:indico-contribution-99-728@indico.inp.nsk.su DESCRIPTION:Speakers: Peter Bagryansky (Budker Institute of Nuclear Physic s)\nThe report provides a review of research results aimed at developing a method for generating preliminary plasma in open type magnetic traps usin g ECR gas breakdown. This method has proven positively itself in a number of experiments with plasma heating by neutral beam and auxiliary ECR heati ng at the GDT device. In addition\, the results of recent studies on the d evelopment of a method for generation a preliminary plasma using an electr on beam injected through a magnetic mirror into a trap pre-filled with gas are presented. This method also showed high efficiency\, while demonstrat ing ease of implementation and high reliability. The developed methods are compared with each other and with the traditional method for injecting pr eliminary plasma through a magnetic plug using an arc-type gas discharge s ource. The main conclusion of the work is that both recently developed met hods can be effectively used in installations of the next generations base d on ostrong textpen-type magnetic traps with a linear configuration.\n\nh ttps://indico.inp.nsk.su/event/19/contributions/728/ LOCATION:Budker INP Conference Hall URL:https://indico.inp.nsk.su/event/19/contributions/728/ END:VEVENT BEGIN:VEVENT SUMMARY:Diagnostic instrumentation for the next generation of GDT devices DTSTART;VALUE=DATE-TIME:20191118T082500Z DTEND;VALUE=DATE-TIME:20191118T084500Z DTSTAMP;VALUE=DATE-TIME:20260610T161321Z UID:indico-contribution-99-734@indico.inp.nsk.su DESCRIPTION:Speakers: Andrej Lizunov (Budker Institute of nuclear physics) \nDevices of the GDT type belonging to the next generation are being propo sed for a vast range of scientific and technological applications\, includ ing fusion neutron sources\, hybrid fission-fusion power plants and others . The next step GDT-like system is deemed as a large-scale installation su staining plasmas with a significant fusion power generation in a stationar y or long-pulse regime. The paper describes several new diagnostics and ph ysical data acquisition and processing systems developed in the Budker Ins titute for forthcoming fusion plasma experiments.\n\nThe combined diagnost ic based on the motional Stark effect and laser induced fluorescence (MSE- LIF) inherits advantages of the spectral and polarimetric MSE versions to measure the magnetic field value and direction. The presented project of t he MSE-LIF diagnostic at GDT is close to the final assembling and commissi oning.\n\nThe recently upgraded diagnostic of laser Thomson scattering at GDT has six spatial points for measurements of the electron temperature an d density. The scattered light is analyzed by filter spectrometers of the innovative design using time-stretch digitizers. The planned second phase of the diagnostic enhancement is installation of the multi-pulse Nd:YAG la ser for a sub-millisecond time resolution in every plasma shot.\n\nThe pap er discusses the development of series of data acquisition and analysis el ectronic devices for physical experiments. The instruments range from the compact isolated ADC with the optical fiber data link to the complete data collection and processing system for the vertical neutron camera (VNC) fo r the ITER project and similar large-scale machines with high radiation co nditions.\n\nhttps://indico.inp.nsk.su/event/19/contributions/734/ LOCATION:Budker INP Conference Hall URL:https://indico.inp.nsk.su/event/19/contributions/734/ END:VEVENT END:VCALENDAR