6th QPM Report on MGA, XMM, G4

1
6th QPM Report on MGA, XMM, G4

• Fan Lei
• 8 November 1999
• Defence Evaluation Research Agency, Farnborough

2
XMM SImulations

• The G4MutipleScattering Process
• Investigation on distribution of the protons
  scattering off gold at small angle incidents
• high dependent on stmin and demax at low energies
  (100s keV)
• less so at MeV regions
• optimal values
• stmin 10 nm
• demax 0.01 - 0.05
• stmax no significant effect
• No significant impact using new
  G4SteppingManager.cc and G4MutipleScattering.cc

3

100 keV Protons onto Au layer at 1 degree
Stmin 0.01 um --- demax 0.05 --- demax 0.01
stmin 0.1 um --- demax 0.05 --- demax 0.01
Protons/Bin
Stmin 0.005 um --- demax 0.05 --- demax 0.01
Stmin 0.001 um --- demax 0.05 --- demax 0.01
Scattering Angle (degree)
4
100 keV Protons onto Au layer at 1 degree
Stmin 0.01 um --- demax 0.05 --- demax 0.01
Stmin 0.1 um --- demax 0.05 --- demax 0.01
Protons/Bin
Stmin 0.001 um --- demax 0.05 --- demax 0.01
Stmin 0.005 um --- demax 0.05 --- demax 0.01
Scattered Energy / Incident Energy
5
Comparison with Experimental data

• 1300keV Proton onto gold at 1.58 degree incident
  angle
• 1 degree square at (5.7o, 0o) and (3.4o, 0o)
• Exp Trim G4(1) G4(2) G4(3) G4(4)
• 5.7 13.6 30 7.94 6.63 6.4 7.8
• 3.4 27.3 40 23.9 24.4 25.3 25.9
• G4(1) stmin 0.001 demax 0.05
• G4(2) 0.001 0.01
• G4(3) 0.01 0.01
• G4(4) 0.01 0.05

6
GEANT4 Installation

• ESTEC
• A Linux (Redhat 5.2) hard disk has been delivered
  and installed.
• Version 4.01 (ref 02, stl/rw) available on Linux
  and SUN Solaris.
• DERA
• Version 4.01 (stl/rw) available on Linux and Sun
  Solaris
• Problem with pserver behind the DERA firewall.
• CVS checkout/update has to be done at CERN or UoS
• UoS
• Version 4.01 (STL) on Linux Redhat 6.0
• Also available on Sun Solaris

7
Material Generation Association Tool (MGA)

• Java Application based on GGE.
• Beta version completed.
• Supporting documents
• User Requirements Document
• Software Specification Document
• Software Users Manual
• Software Verification and Validation Document
• Will be delivered after the QPM.

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MGA (cont.)

• Example (mgatest01) CMStracker.step
• MGA scan 33 volumes
• Arbitrary material and visualisation association
  using entries in the MGA material database and
  colour database
• CMStracker.step and CMStracker.mga used as inputs
  to mgatest01
• Remaining problems and issues
• G4 cannot visualise the step geometry in the
  current version.
• Current G4 step reader cannot handle the latest
  AP203 files.
• Latest step file from ESTEC (SREM INTEGRAL)
  revealed a potential problem
• A step volume can be a combination of many
  unidentified volumes, of different materials
• G4 step reader and MGA will treat it as a single
  volume
• Step file has to be the assembly CAD drawing with
  each components identifiable.