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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-7898
DTSTART:20220926T170000Z
DTEND:20220926T230000Z
DTSTAMP:20260414T073951Z
LAST-MODIFIED:20220922T191827Z
LOCATION:1610 Engineering Hall
SUMMARY:The plasma edge and beyond: application of plasma edge diagnos
 tics at W7-X\, Plasma Physics (Physics/ECE/NE 922) Seminar\, Philip Dr
 ews\, Heinrich-Heine-Universitä Düsseldorf
DESCRIPTION:The Langmuir probe diagnostic has been present since the d
 iscovery of the plasma state of matter. 
\nThey are still used in cont
 emporary experiments like EAST\, JET or W7-X\, both fixed on plasma fa
 cing components and mounted on manipulators for profile measurements. 
 
\nThe diagnostic can observe the electron temperature and density\, a
 s well as flow velocities and information about the turbulence in the 
 plasma.  
\nThe main advantages of the Langmuir probe are the simple s
 etup\, analysis\, as well as high spatial and temporal resolution. Whi
 le the utility of the diagnostic is obvious\, limitations and pitfalls
  of Langmuir and other probe measurements should be highlighted.
\n 
\
 nThe presentation will focus on results obtained from diagnostics prob
 es utilized in conjunction with the Multipurpose Manipulator (MPM) sys
 tem at W7-X.
\nFurthermore\, the practical aspects of advanced diagnos
 tic concepts like the retarding field analyzer for ion temperature mea
 surements are discussed.
\n 
\nA new probe head for HSX was developed 
 for the measurement of plasma edge parameters\, like the electron dens
 ity and temperature\, the ion temperature and turbulence. The experien
 ces from both W7-X and HSX were used to design a probe that should be 
 minimally invasive during the measurement and provide good coverage of
  the aforementioned plasma parameters.
\nFinally\, the integration of 
 Probe measurements at W7-X into the wider picture of other diagnostic 
 measurements and the use of modelling will be presented.
\n 
\n
\n
URL:https://www.physics.wisc.edu/events/?id=7898
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