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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-8879
DTSTART:20240909T170500Z
DTEND:20240909T180000Z
DTSTAMP:20260413T184624Z
LAST-MODIFIED:20240903T144359Z
LOCATION:1610 Engineering Hall
SUMMARY:First plasma experiments in WHAM\, Plasma Physics (Physics/ECE
 /NE 922) Seminar\, Dmitry Yakovlev\, University of Wisconsin-Madison
DESCRIPTION:In this talk\, I will provide a brief introduction to the 
 Wisconsin Axisymmetric HTS Mirror (WHAM)\, a groundbreaking magnetic c
 onfinement experiment recently constructed and launched at UW-Madison.
  This experiment features record-breaking 17 Tesla superconducting mir
 ror magnets and a variety of plasma heating systems\, achieving a tota
 l heating power density of up to 50 MW/m³. This unique combination of
  parameters enables a wide range of mirror confinement studies that we
 re not possible previously.<br>
\n<br>
\nI will discuss the unique eng
 ineering solutions implemented in the machine’s design\, along with 
 insights gained from its assembly and initial operation. Drawing from 
 my experience with large mirror experiments\, I will highlight critica
 l research topics that could advance us toward practical fusion applic
 ations.<br>
\n<br>
\nDuring the first experimental campaigns\, WHAM ac
 hieved a successful ECR breakdown\, consistently producing plasma at p
 ower levels as low as 10 kW of 110 GHz microwave radiation\, and with 
 densities exceeding 1019 m-3. Several observed effects\, such as densi
 ty saturation and dependency on prefill pressure\, align well with pub
 lished data\, while others – much higher diamagnetic flux (0.4 mWb)\
 , hot electrons with confinement time of ~ 1 s and indications of inte
 nse MHD activity during ECH are reported for the first time. Initial e
 xperiments with 22 keV deuterium neutral beam injection demonstrated b
 eam attenuation of > 50%\, although the fast ion confinement time is c
 urrently limited by high charge-exchange losses.<br>
\n<br>
\nI will c
 over these findings and outline near-term experimental plans aimed at 
 advancing the experiment’s scientific goals.
URL:https://www.physics.wisc.edu/events/?id=8879
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