Hi Taylan, standard reconstruction does not handle field off data, because
the fit will be singulare in p. forcing field 0 causes searching in P
without proper termination.
instead, Ben had made a linear fitter. if I remember correctly, use nsed
-l #### to activate his fitter(-l for linear). I am not certain of the
status of the project, especially now that he is gone for CEBAF.
I don't remember the linear fitter to be integrated into lrn however. So
no 0-field cruncher for the moment.
Anyhow, Ben should know best about fitting for 0-field.
Chi
On Wed, 5 May 2004, Taylan Akdogan wrote:
> Hi,
>
> I've been looking into some field-off runs. To be more specific,
> running nsed with run 4585. I noticed that the tracks are
> constructed with curvatures, like the runs with field-on.
>
> Doesn't it get the information from epics or a DB?
> Is there an option to force the field to be zero?
>
> Thanks,
> Taylan
>
> --
> ---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
> Taylan Akdogan Massachusetts Institute of Technology
> akdogan@mit.edu Department of Physics
> Phn:+1-617-258-0801 Laboratory for Nuclear Science
> Fax:+1-617-258-5440 Room 26-402b
> ---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
>
>
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