Introduction to the NHMFL Pulsed Field Facility at LANL

Information on the physical set-up of pulsed field measurements

Read about lock-in amplifiers and their role in your measurements

Information about noise and ways to eliminate it from your measurements

How to collect and evaluate your measurement data

Information on optical spectroscopy

Information about time-resolved optics

Information on de Haas van Alphen Effect measurements

Information on Shubinkov de Haas Effect measurements

Information on Absolute Resistivity measurements

Information on Heat Capacity measurements

Information on RF Penetration Depth measurements

Sample Contact Resistance


CONTACT RESISTANCE:

One factor governing noise is the sample contact resistance. Acceptable values range near 500 m. Samples with resistance greater than about 100 kcannot be measured well in the 50 or 60 Tesla pulsed magnets.

For pulsed field experiments, interference, rather than true thermodynamic noise, is the biggest concern. Interference consists of many types of noise sources. Natural sources include cosmic background radiation and radiation from the sun. Man-made sources consist of TV, radio, cellular telephones, store alarms, and most importantly, the pulsed magnet and the computer and instrument rack.