The coils were wired for outbending electrons during all of the field
measurements. We did reverse the current and make some measurements on
the beam left sector, which confirmed that the magnitude of the field is
independent of current direction.
Karen
Douglas Hasell wrote:
>
> Hi,
>
> Aaron just pointed out to me (and I checked it and confirm) that
> the polarity of the magnetic field in the data file bgrid.blast which Abi
> Goodhue produced is for out-bending electrons (ie opposite to the way we
> normally run). So if we use this data file anywhere to analysis you must
> remember to take the negative of the components or vector.
>
> The magnetic field points down in the left sector and up in the
> right sector for in-bending electrons which is our normal operating mode.
>
> Cheers,
> Douglas
>
> 26-415 M.I.T. Tel: +1 617 258 7199
> 77 Massachusetts Avenue Fax: +1 617 258 5440
> Cambridge, MA 02139, USA E-mail: hasell@mit.edu
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