Modeling Production, Interactions and Transport

FermilabNovember 14, 2005

FermilabILC-CAL

Nikolai Mokhov, Fermilab

n/n

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov2

OUTLINE

•General Purpose Event Generators and Transport Codes

•Neutron Production and Interactions•Transport at High and Low Energies

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov3

GENERAL-PURPOSE CODES (2005)

Criteria for this express-analysis:

1.General-purpose widely-used code.2.Event generators with consistent soft and

hard multiparticle production in hA , ( AA ), A and A at MeV to many TeV.

3.Full particle transport from a fraction of eV to many TeV in complex target/ accelerator/ detector/ shielding systems.

4.Codes are actively developed, supported and discussed at conferences last decade.

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov4

HADRONIC CODES

•FLUKA – INFN: DPMJET, PEANUT•GEANT4 – CERN: INC, QMD•MARS15 – FNAL: CEM, LAQGSM, DPMJET,

Inclusive, MCNP•MCNPX – LANL: Tables, CEM, no EMS, no

magnetic field, work towards high energies in progress

•PHITS – JAERI: QMD•SHIELD – INP Troitsk: INC, QGSM, no EMS, no

magnetic field, simple geometry

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov5

SOME COMMENTS

• Current ‘2005 FLUKA and MARS15 are in a very good agreement with data and with each other in all applications• Other codes also perform well for neutronics• Antineutron yields and interactions are reasonably well understood and described by codes. E.g., DPMJET yields for 100-GeV proton on iron: 5.9 protons, 7.4 neutrons, 0.075 pbars, and 0.0735 nbars

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov6

NEUTRON YIELD: GEANT4, 256-MeV p+Fe

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov7

NEUTRON YIELD: GEANT4, 597-MeV p+Fe

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov8

MARS15 EXCLUSIVE EVENT GENERATORS

The improved Cascade-Exciton Model code, CEM03.01, combined with the Fermi break-up model, the coalescence model, and an improved version of the Generalized Evaporation-fission Model (GEM2) is used as a default for hadron-nucleus interactions below 5 GeV. The Los Alamos Quark-Gluon String Model code, LAQGSM03, was implemented into MARS15 for particle and heavy-ion projectiles at 10 MeV/A to 800 GeV/A. This provides a power of full theoretically consistent modeling of exclusive and inclusive distributions of secondary particles, spallation, fission, and fragmentation products. Further development of this package is underway.

For quite some time, MARS has used the Dual-Parton Model code, DPMJET3,for the very first vertex in a cascade tree. This is used in our numerous studies for the LHC 7x7 TeV collider and its detectors, and at very high energies up to 100 TeV.

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov9

NEUTRONS IN CEM03/MARS15

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov10

NEUTRONS IN CEM03/MARS15

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov11

LAQGSM/MARS15: 0.56 and 8 GeV/A REACTIONS

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov12

MARS INCLUSIVE EVENT GENERATOR (1)

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov13

MARS INCLUSIVE EVENT GENERATOR (2)

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov14

INCLUSIVE NUCLEON PRODUCTION IN MARS15

MARS15 vs data

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MARS15: NEUTRON ELASTIC SCATTERING

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov16

MARS15 NEUTRON AND NBAR X-SECTIONS

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov17

NEUTRON SPECTRA FOR 2-GEV ELECTRON BEAM

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov18

NEUTRON YIELD FROM LEAD CYLINDER

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MARS, FLUKA and other codes for in thick targets and shielding at 0.8, 10 and 50 GeV

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov20

Introducing JQMD in PHITS : H. Iwase et.al. J. Nucl. Sci.Technol. 39 (2002) 1142

Results of PHITS

JQMD-2

Neutron Spectra from Thick Target

JQMD code in PHITS JQMD code in PHITS

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov21

100 101 102 103 104 10510-15

10-14

10-13

10-12

10-11

10-10

10-9

10-8

10-7

10-6

10-5

Neutron Energy (MeV)

Neut

ron

flux

(cm

-2 p

roto

n-1 p

er l

eth

arg

y)

Ep=12GeV Cu:1mmt

4°

45°

90°

120°

MCNPX

PHITS

calculated by N. Matsuda

DDX of Secondary Particles DDX of Secondary Particles

p(12GeV) + Cu -> neutron

neutron

Matsuda (1)

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov22

calculated by H. Ohnishi. in Dr. thesisDepth Dose Distribution in Cu 10cm radiusDepth Dose Distribution in Cu 10cm radius

Ohnishi (2)

ILC-CAL, Fermilab, November 14, 2005 n/nbar modeling - N.V. Mokhov23

calculated by H. Ohnishi. in Dr. thesisDepth Dose Distribution in Cu 10cm radiusDepth Dose Distribution in Cu 10cm radius

Ohnishi (3)