| 1 | ========================================================================
|
|---|
| 2 |
|
|---|
| 3 | cosmicray_charging advanced example
|
|---|
| 4 |
|
|---|
| 5 | Henrique Araujo & Peter Wass
|
|---|
| 6 | Imperial College London
|
|---|
| 7 |
|
|---|
| 8 | April 2004
|
|---|
| 9 |
|
|---|
| 10 | ========================================================================
|
|---|
| 11 |
|
|---|
| 12 | This Geant4 example was derived from an application aimed at
|
|---|
| 13 | simulating the electrostatic charging of isolated test masses in the
|
|---|
| 14 | LISA mission by galactic cosmic ray protons and helium nuclei. This
|
|---|
| 15 | work was supported by the European Space Agency through the SEPTIMESS
|
|---|
| 16 | project under Contract No. 16339/02/NL/FM.
|
|---|
| 17 |
|
|---|
| 18 | LISA, the Laser Interferometer Space Antenna for the detection of
|
|---|
| 19 | gravitational waves, is a joint ESA/NASA mission composed of three
|
|---|
| 20 | identical spacecraft orbiting the Sun in a triangular formation, each
|
|---|
| 21 | containing two cubic test masses in pure geodesic (drag free) motion.
|
|---|
| 22 | The interferometric measurements between different spacecraft
|
|---|
| 23 | are affected by the accrual of charge in the test masses caused by the
|
|---|
| 24 | interaction of energetic cosmic rays.
|
|---|
| 25 |
|
|---|
| 26 | With this example we intend to demonstrate an application of Geant4 to
|
|---|
| 27 | space environment simulations, using an extensive set of physics
|
|---|
| 28 | models spanning from TeV energies down to a few hundred eV. This code
|
|---|
| 29 | retains most (but not all) of the complex spacecraft and sensor
|
|---|
| 30 | geometry implemented for the original purpose. In particular, some
|
|---|
| 31 | complex elements of the inertial sensor surrounding the test masses
|
|---|
| 32 | have not been included. Differential energy spectra for protons, He-4
|
|---|
| 33 | and He-3 nuclei at solar minimum conditions are the only input macros
|
|---|
| 34 | provided. The remaining application classes have been kept unchanged.
|
|---|
| 35 |
|
|---|
| 36 | A Software Users' Manual suitable for Geant4 users of all levels is
|
|---|
| 37 | distributed with this application (/docs). The technical description
|
|---|
| 38 | of the original software package, including further software
|
|---|
| 39 | documentation, physics analysis and a similar effort for the precursor
|
|---|
| 40 | ESA mission LISA Pathfinder are available from the SEPTIMESS project
|
|---|
| 41 | website at http://reat.space.qinetiq.com/septimess/ or from
|
|---|
| 42 | http://astro.ic.ac.uk/~haraujo/SEPTIMESS/ .
|
|---|
| 43 |
|
|---|
| 44 | Any queries regarding this example or the original work can be
|
|---|
| 45 | directed to h.araujo@imperial.ac.uk.
|
|---|
