[Gate-users] X-ray source emission direction

[Howard]

Hello GATE users,

I am using GATE v8.2 and have a question about setting the X-ray emission
direction. I have the following script for setting the X-ray source
(monochromatic):

/gate/source/addSource xraygun gps
/gate/source/verbose 0
/gate/source/xraygun/gps/verbose 0
# Particle type
/gate/source/xraygun/gps/particle gamma

# Source geometry
/gate/source/xraygun/gps/type Plane
/gate/source/xraygun/gps/shape Rectangle
/gate/source/xraygun/gps/halfx 0.025 mm
/gate/source/xraygun/gps/halfy 0.025 mm

# Source position
/gate/source/xraygun/gps/centre 0. 0. -80. mm

# Emission direction
/gate/source/xraygun/gps/mintheta  0. deg
/gate/source/xraygun/gps/maxtheta 15.0 deg
/gate/source/xraygun/gps/angtype iso

# Energy distribution
/gate/source/xraygun/gps/energytype Mono
/gate/source/xraygun/gps/monoenergy 20.0 keV
/gate/source/list

The script above sets the X-ray source with the beam directed toward +z
direction. Everything is fine, but now I now want to set the source center
on the y axis by doing:

gate/source/xraygun/gps/centre 0. 80. 0. mm

and I still would like to have the theta angle to be 10 degree but toward
the -y direction.  How can I achieve that?

Many thanks.

Howard
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