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

Data Collection and Analysis


 

DATA COLLECTION:

During your experiment, the digitizer records the voltage changes at a fixed rate of time (converting it from analog to digital). These multichannel digitizers are capable of recording the signals from not only the experiment, but also the amplifiers, direct voltage, etc. The waveform of dB/dt is recorded by the digitizer and then integrated by DAQ software to obtain a "Time Profile." The resulting profile is a waveform showing the magnetic field at each moment in time. The profile can now be used to help interpret any data received from your sample in accordance with your experimental specifications.

In order to record the magnetic field at the sample position when the magnet is pulsed, a solenoid, dB/dt, is placed near the sample on the end of the probe. When the magnet is pulsed, there is a specific coil callibration constant for each probe that will help calculate the data. When the magnet is pulsed, the magnetic flux induces voltage in the dB/dt coil which is proportional to rate of change in magnetic flux.

ANALYSIS:

The data from your measurement will be obtained by labview software called PulseMagnet DAQ. PulseMagnet DAQ allows the user to manipulate the conditions under which the measurements will be taken, view the measurements and ultimately save the results in the appropriate format.

More detailed instructions for using PulseMagnet DAQ can be found in a user manual which is provided in each cell. A copy of this manual can also be accessed as a PDF file.