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Forum: Fields: Magnetic and Otherwise
Re: Question Field profile in GEANT4 (Valentin Kozlov)
Date: 18 Jun, 2002
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

On Tue, 18 Jun 2002, Valentin Kozlov wrote:

> *** Discussion title: Fields: Magnetic and Otherwise
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/emfields/3"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Hello everybody,
> 
> I know that in GEANT it is possible to put the real field profile
> (measured points) but how to do it? Does somebody have a nice example?
> The way which I see for a moment is to use GetFieldValue() function and
> to make the interpolation between the points. For that I am going to
> look on Example N04.
> 
> The second question. I can describe a uniform magntic field for whole
> set-up. In my ideal case I have a combination of two uniform magnetic
> fields: one 9T and one 0.1T. The first is in one cylindre and second in
> other one, connected to the first one.
> 
> ________
> |      |
> |      |
> |      |
> |      | 0.1T
> |      |
> |      |
> |      |
> --    --
>   |  |
>   |  |    9T
>   |  |
>   ----
> 
> So, can I define magnetic field for certain volumes and can GEANT
> calculate the field between these volumes itself?
> 
> Best regards, Valentin
> 
Hi,

In most cases user have to define field using the interface. So, it is
his/her responsability to return field values which are consistent with
Maxwell's lows. Note, that fuild can be assigned to a logical volume, and
trasportation without field is significantly faster.

VI

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