[Gate-users] Quadrupoles and dipoles in GATE

[Grevillot Loic]

Hello,

Just additional info.
Usually to simulate beam line transport, people use some analytical transport codes (turtle, or else) describing beam optics in quadrupoles, dipoles, etc. based on matrices.
Monte Carlo is useful to simulate the end of the beam line and beam interactions in patients. Beam modeling usually starts (for active scanning delivery) either from nozzle exit or from nozzle entrance, but there is no strong need to simulate scanning magnets, which are usually set-up much before the nozzle entrance (even if it is possible in Geant4 to simulate the scanning system).

Sincerely,

Loïc




From: gate-users-bounces at lists.opengatecollaboration.org [mailto:gate-users-bounces at lists.opengatecollaboration.org] On Behalf Of David Sarrut
Sent: Mittwoch, 11. März 2015 08:53
To: Erik Almhagen
Cc: gate-users
Subject: Re: [Gate-users] Quadrupoles and dipoles in GATE

Hello Erik,

I never used magnetic field in Gate, but it seems that some macros exist to define a global field (/gate/geometry/setMagField).

If it does not fit your need, you will need to create specific classes in Gate that Geant4 concepts (http://geant4.web.cern.ch/geant4/G4UsersDocuments/UsersGuides/ForApplicationDeveloper/html/Detector/electroMagneticField.html). It should not be too difficult. Just think to start from the last version of the Gate source code in the git repository, and start by creating a new branch.

(To my knowledge, no current plan to implement magnetic field attached to a specific volume in Gate)

Sincerely,
David

On Fri, Mar 6, 2015 at 1:56 PM, Erik Almhagen <ealmhagen at gmail.com<mailto:ealmhagen at gmail.com>> wrote:
Hello

I am a new GATE user, predominantly interested in its radiotherapy applications. My longer term goals are to simulate dose distributions using CT-images, especially with an eye to paediatric patients. Before all that I want to implement a beamline/nozzle. In the 7.0 User's guide, it says:

"A magnetic field can be defined. It will be attached and thus active in the whole world volume. It is currently not possible to confine the field to another volume."

Since I want to model quadrupoles and dipoles, I do not want to have a homogeneous, world-wide magnetic field, but rather a number of fields confined to certain volumes.  Am I perhaps looking in the wrong place, or is that not possible to model at the moment in GATE?

If it is not possible at the moment, is there anyone with plans to implement it?

With regards
/Erik Almhagen

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