Volume 77, Issue 8, August 2006
Index of content:
- ELECTRONICS; ELECTROMAGNETIC TECHNOLOGY; MICROWAVES
77(2006); http://dx.doi.org/10.1063/1.2336188View Description Hide Description
A relatively simple high voltage discharge system has been designed for capacitor pulse discharge with peak current around with a time to peak in the microsecond range. The circuit is novel in that all low voltage electronics are powered from the high voltage supply, and the system operates as a relaxation oscillator. The system can be used to study the degradation of the capacitors as a result of pulse discharge.
A photonic band-gap resonator to facilitate GHz-frequency conductivity experiments in pulsed magnetic fields77(2006); http://dx.doi.org/10.1063/1.2336761View Description Hide Description
We describe instrumentation designed to perform millimeter-wave conductivity measurements in pulsed high magnetic fields at low temperatures. The main component of this system is an entirely nonmetallic microwaveresonator. The resonator utilizes periodic dielectric arrays (photonic band-gap structures) to confine the radiation, such that the resonant modes have a high factor, and the system possesses sufficient sensitivity to measure small samples within the duration of a magnet pulse. As well as measuring the sample conductivity to probe orbital physics in metallic systems, this technique can detect the sample permittivity and permeability allowing measurement of spin physics in insulating systems. We demonstrate the system performance in pulsed magnetic fields with both electron paramagnetic resonance experiments and conductivity measurements of correlated electron systems.