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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:9
UID:UW-Physics-Event-8495
DTSTART:20231108T180000Z
DTEND:20231108T191500Z
DTSTAMP:20260414T044251Z
LAST-MODIFIED:20231104T162414Z
LOCATION:1610 Engineering Hall
SUMMARY:The stellarator Wendelstein 7-X: Towards long pulse\, high per
 formance operation\, Special Plasma Seminar\, Olaf Grulke\, Lead Plasm
 a Operation Wendelstein 7-X
DESCRIPTION:<br>
\n<i>O. Grulke<sup>1\,2</sup> and the Wendelstein 7-X
  Team<sup>1</sup><br>
\n1. Max-Planck Institute for Plasma Physics\, G
 reifswald\, Germany<br>
\n2. Technical University of Denmark\, Kongens
  Lyngby\, Denmark<br></i>
\n <br>
\n“The stellarator Wendelstein 7-X
 : Towards long pulse\, high performance operation”
\n<br>
\n<br>
\nA
  major goal of the superconducting stellarator Wendelstein 7-X is the 
 exploitation of the reactor potential of the HELIAS concept. Its modul
 ar magnetic field configuration is optimized to provide improved neocl
 assical and fast ion confinement\, enhanced MHD stability\, and the fe
 asibility of a divertor concept. During the last maintenance phase\, W
 endelstein 7-X has undergone major modifications with the realization 
 of a fully water-cooled graphite divertor and plasma facing components
 \, which represent the technical completion for long-pulse operation w
 ith the goal to increase the energy turnaround to 18GJ over the next o
 peration campaigns. The newly installed high heat flux divertor is cap
 able to withstand steady-state heat flux densities of up to 10 MW/m2. 
 In total\, 600 in vessel cooling circuits were installed and successfu
 lly commissioned. The heating power of the neutral beam injection syst
 em was doubled with the commissioning of two additional injectors\, pr
 oviding in total up to ~8MW of heating power. A new pellet injector sy
 stem was installed to allow for steady-state core fueling. Additionall
 y\, a lot of new or strongly enhanced diagnostics system were installe
 d. With these enhancements\, plasma operation restarted in September 2
 022 for a period of 6 months. Key objectives for the campaign were the
  demonstration of long-pulse operation with an energy turnaround excee
 ding 1GJ and studies of enhanced plasma confinement and its relation t
 o neoclassical and turbulent transport phenomena. Long pulseoperation 
 was achieved with discharge lengths of 8min with attached divertor and
  over 100s in full divertor detachment. Using NBI injection and the as
 sociated central peaking of the plasma density profiles\, core turbule
 nce could be widely suppressed and the transport of energy and particl
 es reduced to neoclassical levels. This presentation gives an overview
  of the conduction and key achievements of the last operation campaign
 .<br>
\n 
URL:https://www.physics.wisc.edu/events/?id=8495
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