BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Continuously operated high performance vacuum-pumping systems for Gas-Dynamic Trap DTSTART;VALUE=DATE-TIME:20191119T031000Z DTEND;VALUE=DATE-TIME:20191119T033000Z DTSTAMP;VALUE=DATE-TIME:20260513T213321Z UID:indico-contribution-101-714@indico.inp.nsk.su DESCRIPTION:Speakers: Alexander Krasnov (BINP)\nEstimation shows that powe rful Gas-Dynamic Trap operated for generating neutrons at continuous rate 1E18 1/s will release high particle flux (∼3E22 1/s of D/T mixture) out of confinement region. The vacuum vessel of the Gas-Dynamic Trap consists of central cylindrical confinement volume and two plasma expansion vessels . In order to sustain the adequate vacuum conditions in the expansion vess els (\n\nhttps://indico.inp.nsk.su/event/19/contributions/714/ LOCATION:Budker INP Conference Hall URL:https://indico.inp.nsk.su/event/19/contributions/714/ END:VEVENT BEGIN:VEVENT SUMMARY:Minimum B mirror trap with guiding center motion on magnetic surfa ce DTSTART;VALUE=DATE-TIME:20191119T020000Z DTEND;VALUE=DATE-TIME:20191119T024500Z DTSTAMP;VALUE=DATE-TIME:20260513T213321Z UID:indico-contribution-101-718@indico.inp.nsk.su DESCRIPTION:Speakers: Olov Ågren (Uppsala University)\nA properly shaped quadrupolar mirror magnetic field\, in combination with a controllable wea k radial electric field\, is predicted to force each guiding center to mov e close to its mean magnetic surface. A neoclassical increase of radial tr ansport would then be practically eliminated. The radial electric field ma y be controlled by biased end plates placed at the end tank outside the co nfinement region where the magnetic field lines intersect. A radial invari ant\, the radial Clebsch coordinate of the gyro center\, can be used to de rive Vlasov equilibria with a finite plasma beta. The minimum B property o f the trap is a strong indicator of MHD stability. For a magnetic field en ded by two expanders\, magnetic field shaping is made aiming at minimum dr ift and ellipticity. The corresponding magnetic field can be reproduced by superconducting coils up to a mirror ratio of 4 or somewhat higher. Mirro r ratios exceeding 10 may be reachable with finite beta effects included. Analytical expressions in closed form are derived. The study addresses pot entials for the concept as a fusion neutron source.\n\nhttps://indico.inp. nsk.su/event/19/contributions/718/ LOCATION:Budker INP Conference Hall URL:https://indico.inp.nsk.su/event/19/contributions/718/ END:VEVENT BEGIN:VEVENT SUMMARY:Features of GDMT design relevant to the development of ALIANCE DTSTART;VALUE=DATE-TIME:20191119T033000Z DTEND;VALUE=DATE-TIME:20191119T035000Z DTSTAMP;VALUE=DATE-TIME:20260513T213321Z UID:indico-contribution-101-720@indico.inp.nsk.su DESCRIPTION:Speakers: Dmitry Yakovlev (BINP)\nGas-dynamic multi-mirror tra p (GDMT) is an ongoing project in development at Budker Institute of Nucle ar Physics\, which aims to demonstrate a leap in performance for linear ax isymmetric magnetic plasma confinement systems and lay the groundwork for a full-scale development of fusion neutron sources (NS) based on gas-dynam ic plasma confinement. As a multipurpose facility\, GDMT is being designed to experimentally evaluate a number of concepts\, which promise a dramati c improvement in plasma confinement in linear systems.\nSuperconducting ma gnet system of GDMT consists of a confinement region with magnetic field s trength up to 3 T which is terminated by either single high-field (up to 1 8 T) magnetic mirrors or advanced multi-mirror modules\, which provide nec essary plasma flux suppression. Owing to its modular design\, the system l ength can change from 6 m for studies of high-β plasma regimes to several tens of meters to accommodate for NS studies with maximized confinement z one length and most advanced multi-mirror modules. The design goal is to b uild a modular superconducting magnet system\, which enables an easy recon figuration of the confinement zone and attachment of mirror sections\, whi le being mechanically robust and cryogenically efficient. \nThe report out lines the scientific program of GDMT and reviews the experimental possibil ities it provides to study a set of problems that are most critical to acc elerated development of practical volumetric fusion neutron sources.\n\nht tps://indico.inp.nsk.su/event/19/contributions/720/ LOCATION:Budker INP Conference Hall URL:https://indico.inp.nsk.su/event/19/contributions/720/ END:VEVENT BEGIN:VEVENT SUMMARY:Problems to be addressed in the development of steady state NBIs DTSTART;VALUE=DATE-TIME:20191119T024500Z DTEND;VALUE=DATE-TIME:20191119T031000Z DTSTAMP;VALUE=DATE-TIME:20260513T213321Z UID:indico-contribution-101-724@indico.inp.nsk.su DESCRIPTION:Speakers: Vladimir Davydenko (Budker Institue of Nuclear Physi cs)\nTo build-up and sustain a population of high energy ions of hydrogen isotopes in the GDT-based neutron sources\, injection of a steady-state po werful focused neutral beams with energies up to 100 keV is required. Prob lems arising at update of the high power NBIs developed at the Budker Inst itute with a duration of up to 2 s to the stationary operation mode are di scussed in the report.\nAll the injector elements that operate under high heat loads or/and intense fluxes of energetic particles should be protecte d against those and water cooled to provide reasonable time between replac ements and services. Here\, the key problem is development of ion-optical systems with spherically formed electrodes operated in DC mode\, which are most sensitive to these severe conditions. The RF plasma boxes of the io n sources require some redesign and optimization of Faraday screens to rel iably protect the ceramic parts of plasma box exposed to plasma loads. Ot her elements of the injectors such as neutralizer\, cryo-pumps\, bending m agnets\, beam dumps should be also modified for operation in steady-state regime. For these injector elements the required modifications are quite s traightforward. To increase the energy efficiency of the injectors\, appli cation of steady-state energy recuperator of the residual ions\, which are deflected by the bending magnet\, is very promising.\n\nhttps://indico.in p.nsk.su/event/19/contributions/724/ LOCATION:Budker INP Conference Hall URL:https://indico.inp.nsk.su/event/19/contributions/724/ END:VEVENT BEGIN:VEVENT SUMMARY:Numerical simulation of GDT-based neutron source in DCLC-stable re gimes by DOL code DTSTART;VALUE=DATE-TIME:20191119T035000Z DTEND;VALUE=DATE-TIME:20191119T041000Z DTSTAMP;VALUE=DATE-TIME:20260513T213321Z UID:indico-contribution-101-732@indico.inp.nsk.su DESCRIPTION:Speakers: Vadim Prikhodko (Budker Institute of Nuclear Physics )\nThe paper devoted to simulation of neutron source based on gas-dynamic trap concept. DOL code was used as a main tool for numerical calculations. Stability against Drift-Cyclotron Loss-Cone (DCLC) and Double Hump (DH) m odes is estimated according to [I.A.Kotelnikov\, I.S.Chernoshtanov\, V.V.P rikhodko. Electrostatic instabilities in a mirror trap revisited. Physics of Plasmas v. 24\, p. 122512 (2017)].\n\nhttps://indico.inp.nsk.su/event/1 9/contributions/732/ LOCATION:Budker INP Conference Hall URL:https://indico.inp.nsk.su/event/19/contributions/732/ END:VEVENT END:VCALENDAR