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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-8954
DTSTART:20241014T170500Z
DTEND:20241014T180000Z
DTSTAMP:20260413T184844Z
LAST-MODIFIED:20241014T130932Z
LOCATION:1610 Engineering Hall
SUMMARY:Improved NBI and diagnostics on the Lithium Tokamak Experiment
 -β\, Plasma Physics (Physics/ECE/NE 922) Seminar\, Bill Capecchi\, Un
 iversity of Wisconsin-Madison
DESCRIPTION:Neutral beam injection (NBI) can fulfill a crucial role in
  sustaining\, fueling\, and heating low recycling plasmas in the Lithi
 um Tokamak Experiment-β (LTX-β). Initial results and modeling showed
  limited heating and low coupling of the beam due to a strong dependen
 ce on variations in beam and plasma parameters throughout a discharge\
 , and were only successful at a modest beam energy of 13 keV\, well be
 low the maximum beam energy of 20 keV. Modeling of these discharges su
 ggested heating above that observed\, indicating the need for improved
  determination of the injected beam power and profile shape. A 2D tung
 sten wire calorimeter has been designed and installed at the outlet of
  the neutral beam neutralizer which will give shot specific beam profi
 le data and allow improved constraints on future beam modeling. A neut
 ral particle analyzer (NPA) from UW-Madison is being installed to prov
 ide direct measurement of the confined fast ion population energy dist
 ribution. LTX-β is completing a vented maintenance phase during which
  the neutral beam was realigned to a more optimal injection geometry. 
 Previous modeling has predicted peak beam coupling occurs at a tangenc
 y radius around 35 cm\; the actual shift from 19 to 33 cm (limited by 
 scrape-off on the injection port) is predicted to improve beam couplin
 g by 30% at a beam energy of 13 keV. Improvements to coupling increase
  with beam energy\; at the max beam energy of 20 keV the coupled fract
 ion is expected to double. The status and plans for the upcoming run c
 ampaign will be discussed.
URL:https://www.physics.wisc.edu/events/?id=8954
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