This paper addresses the optimization of RF power absorption into a Laser- Induced plasma, naturally consisting of some highly conductive plasma torus and a surrounding cloud of less conductive...Show moreThis paper addresses the optimization of RF power absorption into a Laser- Induced plasma, naturally consisting of some highly conductive plasma torus and a surrounding cloud of less conductive plasma. By reproducing experimentally determined values in simulations, a characterization of the two plasma-components is made. Using CCD-images, the dimensions of the plasma-components are determined, and an Ansatz is made for the electron density distribution and decay of the conductive component. Using 2.45 GHz power reflection- and 57 GHz voltage transmission measurement data, the dielectric properties of both plasma-components are determined by parametric sweeps in COMSOLTM. Finally, the most accurate characterization of the LI-plasma is implemented in simulations on magnetic induction heating within a TE-102 rectangular and a TE-011 cylindrical cavity, and the resulting power absorption ratios are compared to that of capacitive heating in a TE-101 rectangular cavity.Show less
The working temperature is a limiting factor for improving the sensitivity of Magnetic Resonance Force Microscopy towards imaging of a single nuclear spin. In this report we take a step in lowering...Show moreThe working temperature is a limiting factor for improving the sensitivity of Magnetic Resonance Force Microscopy towards imaging of a single nuclear spin. In this report we take a step in lowering the working temperature by reducing the energy loss of the radio frequent source, using a superconducting NbTiN microwire. A cryogenic calorimeter with 100 nW resolution at 4 Kelvin is developed to investigate the power dissipation of the detection chip, giving new insights on the current design. The use of a NbTiN microwire enables to keep the mixing chamber of a dilution refrigerator at 10mK. The presence of flux vortices penetrating the NbTiN material seems to play an active role in the energy losses. Improvements are proposed on the design of the detection chip to reduce the power dissipation further for future experiments.Show less
