Niobium properties: Some examples

To assist the researcher interested in modeling superconducting niobium using Fondue, I wrote a code NbGenerator to help generate some of the needed information. NbGenerator has built-in functions for thermal conductivity, BCS surface resistance, and Kapitza conductivity. The information in NbGenerator comes from the source code of THEAT. THEAT's values come from the code HEAT.

I take no credit nor will assume any blame for the validity of the niobium properties generated. These properties were researched by others and I am merely rewriting the code (hopefully without typos) in C to make it easier to get to the information that these models provide.

Some documentation for NbGenerator might be forthcoming as a web page if I have time. Comments in the source code should provide all the required information. I have preserved all the relevant comments from the original FORTRAN code.

I invite others to improve this code or write a replacement and provide it for others to use.

NbGenerator Sources

The sources for NbGenerator are available here for downloading (UNIX Makefile included). Two compression types are presented here.

• Tarred and gzipped (6 k).

Below is a link to the FORTRAN source from THEAT that I used to construct NbGenerator. If you have any doubts about the validity of the information in NbGenerator, please check in the FORTRAN code to see if I made a typo or other error in my translation. (Then please inform me of the error.)

• th4_niobium.f (14 k).

CodeWarrior Projects

For those of you who might find it useful, below are provided some Metrowerks CodeWarrior projects to compile the sources above. These are to be downloaded in addition to the sources above. The projects are set up to provide a minimal Macintosh port and were created with CodeWarrior IDE Version 1.7.

• NbGenerator.m.sit.hqx (6 k)

Macintosh PowerPC Executables

The Macintosh OS executable for PowerPC built with the project above can be downloaded here.

• NbGenerator.sit.hqx(47 k)

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Niobium Heat Capacity

Unlike the properties modeled by NbGenerator, the heat capacity doesn't vary much between samples. Click here to get a file (2 k) containing the niobium heat capacity over a broad range. This data was compiled from the literature.

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Tom Hays, Graduate Research Assistant SRF Group, Laboratory of Nuclear Studies Cornell University

trh@lns598.lns.cornell.edu or th18@cornell.edu

Last modified on: Tuesday, July 1, 1997.