1. Visualization of CORSIKA EAS (Development of EAS in the atmosphere)
Akitoshi Oshima
Center for Computational Astronomy(CfCA)
National Astronomical Observatory of Japan
CORSIKA school 2010 OOTY,India

3. Contents Motivation CORSIKA How to visualize CORSIKA data
Animation of CORSIKA EAS
Accelerator for visualization

4. Why visualization? Larger impact
Understanding the phenomena intuitively
Dynamics of the phenomena
Unknown characteristics?
New aspect?

5. Extensive air shower experiment
First interaction
Florescence
Cherenkov telescope
Air shower array

6. Extensive air shower experiment
First interaction
Fluorescence
Cherenkov telescope
Air shower array
CORSIKA covers all kinds of ground based experiments

7. CORSIKA visualization tool
PLOTSH, PLOTSH2
data
DAT track_em (electro magnetic component)
DAT track_hd (hadron component)
DAT track_mu (muon component)
Visualize air shower data
map2png
COAST (we learned in this school)
Handle data with ROOT
Air shower animation

8. How to visualize CORSIKA data
We use PLOTSH
Output data
DAT track_em (electro magnetic component)
DAT track_hd (hadron component)
DAT track_mu (muon component)
Disadvantage
File size is huge
1 shower per RUN

9. How to visualize CORSIKA data
The PLOTSH files contain all tracking steps for each particle with start and
end point to produce demonstration plots of the development of showers.
Calculate position and momenta of each particle
Snapshot taken at every 100nsec.
Initial position
(X1,Y1,Z1,T1)
At given time : T
(X2,Y2,Z2,T2)

10. Snapshots Every 100nsec First interaction Clock starts T1 T2 T3 T4
primary T1
Every 100nsec T2
First interaction
Clock starts T3 T4

11. How to visualize CORSIKA data
Pov-Ray
The Persistence of Vision Raytracer, or POV-Ray, is a ray tracing program available for a variety of computer platforms. It was originally based on DKBTrace, written by David Kirk Buck and Aaron A. Collins. There are also influences from the earlier Polyray raytracer contributed by its author Alexander Enzmann. POV-Ray is freeware with the source code available.

12. Pov-Ray
Official modifications to the POV-Ray source tree are done and/or approved by the POV-Team. Most patch submission and/or bug reporting is done in the POV-Ray newsgroups on the news.povray.org news server (with a Web interface also available). Since POV-Ray's source is available there are unofficial forks and patched versions of POV-Ray available from third parties; however, these are not officially supported by the POV-Team.

13. Shower particles in the movie
Particle colour
photon
proton
electron
positron
muon+
muon-
nutron
Other hadrons
and nuclei

14. photon
Primary : Gamma
Energy : 5TeV

15. muon
nutron
Primary : Proton
Energy : 5TeV

16. proton
Primary : Iron
Energy : 5TeV

17. Animation of CORSIKA EAS
Camera position
Camera 0
primary T1
Camera 4 T2 T3
Camera 1 T4
Camera 2
Camera 3

18. Animation of CORSIKA EAS
Camera 0
Camera 0
Fixed at the first interaction point
Camera 1
Moves down virtically
Camera 2
Fixed at ground and look at the
shower
Camera 3
Fixed at the place where the
shower will land
Camera 4
Moves along with the shower
Camera 1
Camera 2
Camera 3
Gamma
5TeV
Camera 4
Camera 0
Camera 1
Camera 2
Camera 3
Proton
5TeV
Camera 4
Camera 0
Camera 1
Camera 2
Camera 3
Iron
5TeV
Camera 4

19. Accelerator of visualization
Rendering all secondery particles in a snap-
shot takes long time. Therefore computing
cluster can be one of the effective solution
which can run many jobs simultaneously by
distributing jobs to the clustered nodes.
Login node
Job management by PBS
File server with large storage
Distributed rendering
Compute node
CPU : Intel Quad Core Q GHz
Memory : 8GB, 4GB is used for Ram Disk
Cored : 4 x 16nodes = total 64cores
Rendering cluster

20. Visualization flow Login node Storage Snapshot data Network switch
4GB
4GB
4GB
4GB
Ram Disk

21. Visualization flow Login node Submit jobs JOB1 - JOB16 Storage
Snapshot data
Network switch
node1
node2
node15
node16
4GB
4GB
4GB
4GB
Ram Disk

22. Visualization flow Login node Storage Snapshot data Network switch
Job assign
By PBS
Storage
Snapshot data
Network switch
Job1
Job2
Job15
Job16
node1
node2
node15
node16
4GB
4GB
4GB
4GB
Ram Disk

23. Visualization flow Login node Storage Snapshot data Network switch
Job1
Job2
Job15
Job16
node1
node2
node15
node16
4GB
4GB
4GB
4GB
Ram Disk

24. Visualization flow Login node Storage Snapshot data Network switch
Job1
Job2
Job15
Job16
Temporary
file
node1
node2
node15
node16
1.3Gbps
4GB
4GB
4GB
4GB
Ram Disk

25. Visualization flow Login node Storage Snapshot data Network switch
Job1
Job2
Job15
Job16
node1
node2
node15
node16
4GB
4GB
4GB
4GB
Ram Disk

26. Visualization flow Login node Convert to movie Storage Network switch
4GB
4GB
4GB
4GB
Ram Disk

27. Detail of the first animation
Primary : gamma
Energy : 5.5TeV
First interaction point : ~20km
First interaction point
Max number of particles : ~350k
Snapshot : ~900
Time to complete rendering : ~19Hrs
Software : povray
Shower development image
Go to movie ->

28. Summary
Dynamical development of the extensive air shower using CORSIKA data was created
Visualization and animation of the simulation data could show us a new interesting aspects of the phenomena
To accelerate visualization, Computer cluster is very helpful

29. Thank you very much