Re: Fields and currents

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Hi Ramiro,

After a busy week I've looked at the fields again, and I think the
parametrization in BRAT is not right on the data.

> The value of By at high field deviates from a linear function of the
> current because of saturation and hopefully that is well described by
> the parametrisation  in BRAT.

The plots (www.nbi.dk/~ekman/fieldVsCurrent.gif) shows that the measured
By and the parametrization in BRAT (solid lines) differs sligthly at the
high fields. It's clear that a 2nd degree pol cannot reproduce the
saturation effect that the Hall probes show, so the question is if we want
to put the numbers in the DB (I can see that Kris started this project
some time ago) or maybe we could just use a 3rd degree pol in BRAT?

If there are no objections I would like to change the parametrization,
and then we can always put the numbers in the DB later. I just want to be
sure that the By values I got are the right ones. Could you please send
me tables with the latest and greatest measurements?

Cheers,

Claus

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