PowerPoint Presentation
Rotating Wall/ Centrifugal Separation
John Bollinger, NIST-Boulder
constant
Outline
Penning-Malmberg trap radial confinement due to
angular momentum
Methods for adding (or removing) angular momentum
Energy input (heating) of rotating wall
Experimental rotating wall examples:
UCSD Mg+ and e- experiments
Danielson/Surko strong drive regime
NIST no slip
Other examples (if time)
Centrifugal separation
Condition for separation (1981 ONeil manuscript)
Examples from experiments at NIST
Other experimental examples (electron/anti-proton)
Please ask questions !!
Penning-Malmberg trap radial confinement due to angular momentum
axial confinement
conservation of energy
radial confinement
conservation of angular momentum
ONeil, Dubin, UCSD
Axial asymmetries produce increases in
Radial expansion (or spin-down) due to asymmetries
From T.B. Mitchell et al., in Trapped Charged Particles and Fundamental Physics (1999), p. 309.
For laser-cooled plasmas in NIST Penning trap (Rp
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