Open microwave cavity for use in a Purcell enhancement cooling scheme.
A microwave cavity is described which can be used to cool lepton plasmas for potential use in synthesis of antihydrogen. The cooling scheme is an incarnation of the Purcell effect: when plasmas are coupled to a microwave cavity, the plasma cooling rate is resonantly enhanced through increased spontaneous emission of cyclotron radiation. The cavity forms a three electrode section of a Penning-Malmberg trap and has a bulged cylindrical geometry with open ends aligned with the magnetic trapping axis. This allows plasmas to be injected and removed from the cavity without the need for moving parts while maintaining high quality factors for resonant modes. The cavity includes unique surface preparations for adjusting the cavity quality factor and achieving anti-static shielding using thin layers of nichrome and colloidal graphite, respectively. Geometric design considerations for a cavity with strong cooling power and low equilibrium plasma temperatures are discussed. Cavities of this weak-bulge design will be applicable to many situations where an open geometry is required.
Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
N
N
Evetts
Department of Chemistry, AMPEL, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
I
I
Martens
Department of Chemistry, AMPEL, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
D
D
Bizzotto
Institut de Physique Nucléaire, CNRS/IN2P3, Université Paris-Sud, UMR 8608, 91406 Orsay, France.
D
D
Longuevergne
Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
W N
WN
Hardy