[Gate-users] need help: magnetic field makes no difference: problem solved

[pkhateri]

Hello there,

Just to update you about the problem. In Gate, the order of commands -in 
the macro files- matters. What I did was to put the command which 
defines magnetic field a bit further up. The the problem was solved. 
Attached you can see the graphs.

Bests,

Parisa

On 28.08.2019 15:45, pkhateri wrote:
> Hi Jakub,
> 
> Sure! No problem.
> 
> That's true. Photons do not interact but positrons do. The effect
> should be observed on the positron range. Studies show that the
> magnetic filed can limit the range of positron movement in the
> direction perpendicular to the magnetic field. Therefore, we should
> see the scatter graph a bit squeezed along x and y axis in this
> example.
> 
> About my simulation, It was a sphere source located inside an acrylic
> cube (10mm each side). The source is defined as follows:
> /gate/source/addSource                      point_source_O15_NEMA
> /gate/source/point_source_O15_NEMA/setActivity       100000 becquerel
> /gate/source/point_source_O15_NEMA/gps/type Volume
> /gate/source/point_source_O15_NEMA/gps/shape         Sphere
> /gate/source/point_source_O15_NEMA/gps/radius        0.5 mm
> /gate/source/point_source_O15_NEMA/gps/particle      e+
> /gate/source/point_source_O15_NEMA/gps/energytype    Oxygen15
> /gate/source/point_source_O15_NEMA/useDefaultHalfLife
> /gate/source/point_source_O15_NEMA/gps/centre        0 0 0 mm
> /gate/source/point_source_O15_NEMA/gps/angtype       iso
> /gate/source/point_source_O15_NEMA/setForcedUnstableFlag true
> /gate/source/point_source_O15_NEMA/visualize 2000 blue 5
> /gate/source/list
> 
> 
> Please let me know if anything else should be clarified.
> 
> Bests,
> 
> Parisa
> On 28.08.2019 15:21, jbaran wrote:
>> Hi Parisa,
>> 
>> could you please be more specified regarding your simulations? I am so
>> sorry if it is obvious to you and probably I missed something but
>> photons wouldn't interact with the magnetic field as they don't have
>> charge as i.e. electrons or positrons.
>> 
>> All the best,
>> Jakub
>> 
>> 
>> On 2019-08-28 15:11, pkhateri wrote:
>>> Dear Gate users,
>>> 
>>> To check the effect of the magnetic field on my simulation result, I
>>> added this command to my macro file:
>>> /gate/geometry/setMagField 0.0 0.0 7.0 tesla
>>> 
>>> But I don't see any difference between the results with and without
>>> the 7 tesla magnetic field. As an example, attached you can see a
>>> scatter plot of the annihilation points for a point source (O-15)
>>> located inside a 10^3mm^3 acrylic cube. The plots are identical.
>>> 
>>> Any idea what could be wrong with my simulation setting? I really 
>>> appreciate it.
>>> 
>>> 
>>> With kind regards,
>>> 
>>> Parisa
>>> 
>>> 
>>> _______________________________________________
>>> Gate-users mailing list
>>> Gate-users at lists.opengatecollaboration.org
>>> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
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