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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