iFluka : a C interface between Fairroot and Fluka

1
iFluka a C interface between Fairroot and
Fluka

• Motivations
• Design
• The CBM case
• Geometry implementation
• Settings for radiation studies
• Global diagnosis
• Conclusion and Outlook

2
Motivations

• Non intrusive interface
• Fluka used in analogue or biased mode
• C programming using Fairroot Class Library
• Generators ( Urqmd, etc ... )
• Field maps definition
• Standardized IO using Fairroot file structure
• Parameters containers

3
Design
FairRoot
4
iFluka Features

• Fluka version 2006.3b
• C FairRoot interface to native Fluka
• Enable usage of FairRoot class library directly
• precise field maps info (CbmFieldMap)
• external generators ( CbmUrqmdGenerator etc ..)
• etc ...
• FairRoot IO supported
• All Root IO
• Stack info (CbmMCTrack)
• Detector scoring info stored using CbmMCPoint
• General Fluka mesh normalization routine
• directly linked with Fluka executable
• Fluences -gt Dose
• Fluence -gt 1 MeV n-eq
• etc ..

5
Radiation study settings

• Geometry
• CBM cave ( based on technical drawings modifs )
• Magnet (1 ) target MUCH ( compact design )
  taken from CbmRoot
• Primary sources
• DPMJET-III (delta rays beam / beam dump )
• UrQmd (Au-Au central collisions )
• Secondaries (transport)
• Delta rays 50 KeV, hadrons 100 KeV
• Low-energy neutrons library activated
• Magnetic field map from CbmRoot
• 1 Mev n-equivalent fluence normalization

6
New Geometry of the CBM Cave
7
Scoring planes
MDVSTS Scoring planes
Much scoring planes
8
CBM Detectors (2)
9
CBM Cave Geometry
ZY view
XZ view
10
NIEL (1)

• Displacement damage on Si lattice proportional to
  non ionizing energy transfer (NIEL) ( n, p,
  p/-,e).
• To characterize the damage efficiency of a
  particle at E
• Use of the normalized damage function
  D(E)/D(1Mev)
• Tables taken from A.Vasilescu and G. Lindstroem
• ( http//sesam.desy.de/menbers/gunnar/Si-func
  .htm)
• Normalization of hadron fluence F
• F (1 MeV n-eq) ? (D(E)/D(1 MeV)) F(E)
  dE
• with D(1 MeV) 95 MeV mb.
• F (1 MeV n-eq) equivalent 1 MeV-n fluence
• producing the same
  bulk damage

11
NIEL (2)
12
Cave charged particles fluence
DPM
UrQmd
13
Cave neutrons fluence
DPM
UrQmd
14
The electronics cave
15
Much Energy density
16
Much Charged particles fluence
17
Much neutrons particles fluence
18
Conclusion

• iFluka ready to be used for radiation level
• studies
• On going work
• More detailed Geometry
• run time conversion to ROOT format for all
• Fluka estimators
• Normalization routine in C
• Comparison with TFluka (Validation)
• ( Collaboration with ALICE )

19
CBM radiation environment

• Detectors
• MVD STS
• MUCH
• Estimators
• Energy density ( GeV/cm3/primary )
• Fluence ( 1 Mev n equivalent n-equiv/cm2/primary
  )

20
CBM detectors radiation level
21
Geometry
22
Scoring planes
MDVSTS Scoring planes
Much scoring planes
23
MVDs energy density
24
STS Energy density (1)
Sts 2
Sts 1
Sts 3
Sts 4
25
Sts energy density
STS 6
STS 5
STS 8
STS 7
26
MUCH energy density
MUCH2
MUCH 1
MUCH 4
MUCH 3
27
MUCH energy density
MUCH 5
MUCH 6
28
MVDs Charged particles fluence
MVD 1
MVD 2
29
STS charged particles fluence
STS 2
STS 1
STS 4
STS 3
30
Sts charged particles fluence
STS 6
STS 5
STS 8
STS 7
31
MUCH charged particles fluence
MUCH 1
MUCH 2
MUCH 4
MUCH 3
32
Much charged particles fluence
MUCH 6
MUCH 5
33
MVDs neutrons fluence
MVD 2
MVD 1
34
Sts neutrons fluence
STS 2
STS 1
STS 4
STS 3
35
Sts neutrons fluence
STS 6
STS 5
STS 7
STS 8
36
MUCH neutrons fluence
MUCH 1
MUCH 2
MUCH 3
MUCH 4
37
MUCH neutrons fluence
MUCH 6
MUCH 5
38
Conclusion

• iFluka used to estimate fluences for MVD , STS
  and MUCH
• Need to overlay results from UrQmd with DPM (beam
  dump)
• Need more input from detector groups
• Compare with real data ( TRD ... ) and other MC ?