Open AccessTrapped electron cloud bolometer relying on frequency shift.
Author(s) -
Hans Dehmelt
Publication year - 1994
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.91.14.6308
Subject(s) - electron , microwave , physics , penning trap , bolometer , atomic physics , oscillation (cell signaling) , noise (video) , electron cooling , anharmonicity , magnetic field , electron temperature , optics , condensed matter physics , chemistry , detector , biochemistry , quantum mechanics , artificial intelligence , computer science , image (mathematics)
An improved electron cloud bolometer is analyzed. In this device the cloud temperature is read out not via thermal noise induced by the electrons in a coupled LC circuit but via shift in their axial oscillation frequency in the Penning trap confining them. This shift occurs because as the electron cloud expands with increasing temperature, the average restoring force in the slightly anharmonic trap does change perceptibly. The scheme will be useful in exploring the microwave mode structure of the trap cavity and in locating magnetic field values for which the cavity-induced shift in the measured electron g factor disappears.