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  • OPAL
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  • #78

Closed
Open
Created Mar 27, 2017 by adelmann@adelmann🎗Owner

Particle Matter interaction and Large Angle scattering

A 249 MeV proton beam is hitting a degrader

REAL WEDGE_HLEN=0.0197293; REAL START = 0.02;

DEGPHYS_Wedge : SURFACEPHYSICS, TYPE="DEGRADER", MATERIAL="GraphiteR6710";

Wedge1: DEGRADER, L=WEDGE_HLEN, OUTFN="sWedge1.h5", SURFACEPHYSICS=DEGPHYS_Wedge, ELEMEDGE=START;

The claim is that the following transverse real space

image

and transverse momenta space

image

is not correct.

Switching off the large angle scattering (http://amas.web.psi.ch/docs/opal/opal_user_guide.pdf 18.2.2) the "halo" is disappearing, as shown by the red dots in the following picture:

image

Switch off == omment out: https://gitlab.psi.ch/OPAL/src/blob/master/src/Classic/Solvers/CollimatorPhysics.cpp#L777 and https://gitlab.psi.ch/OPAL/src/blob/master/src/Classic/Solvers/CollimatorPhysics.cpp#L746

Now we can enable/disable Rutherford scattering

DEGPHYS_Wedge : SURFACEPHYSICS, TYPE="DEGRADER", MATERIAL="GraphiteR6710", ENABLERUTHERFORD=TRUE; Default is ENABLED

Be aware of the fact this inout file runs only with OPAL-1.6 (git checkout OPAL-1.6) sDegrader_70.in

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