EAR2 simulation update

Collaboration board meeting06.10.2011

Christina Weiss & Vasilis Vlachoudis

FLUKA Simulation for EAR2 2

Outlook

1. Introduction2. Results

Neutron Fluence Resolution Charged Particle Fluence & γ Background Collimation Implemented Beam Dump Neutron Fluence for Irradiation (@ 1.5 m)

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FLUKA Simulation for EAR2 3

INTRODUCTION

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FLUKA Simulation for EAR2 4

Latest simulations• Geometry in the simulations match the

design of the CE plansEAR2 @ 18.4 m

• Implemented Collimator:1. 2m Fe: conical shape 2. 1m PE borated: straight with 8 cm diameter

• Simulations have been performed for a setup:1. Without additional moderator at the bottom of the neutron tube (97e+6 primaries)

2. With Moderator at the bottom of the tube (52e+6 primaries) : Polyethylene (dmin = 1 cm)

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FLUKA Simulation for EAR2 5

RESULTSNeutron Fluence

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FLUKA Simulation for EAR2 6

Neutron Fluence

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In total the neutron fluence is reduced by about 32 % when using an additional moderator for EAR2

FLUKA Simulation for EAR2 7

Neutron Fluence Comparison to EAR1

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Energy Interval

EAR1 EAR2Without Moderator

Gain

[ n / cm2 / pulse ]

Error[%]

[ n / cm2 / pulse ]

Error[%]

0.1 – 10 eV 5.11e4 0.3 8.01e5 2.6 15.7

0.01 – 1 keV 4.07e4 0.3 1.09e6 1.8 26.8

1 – 100 keV 5.03e4 0.2 1.39e6 1.7 27.6

0.1 – 10 MeV 1.77e5 0.1 2.95e6 1.1 16.7

10 – 100 MeV 2.64e4 0.3 4.03e5 2.7 15.2

> 100 MeV 4.71e4 0.3 8.76e4 5.9 1.9

Total Energy Range

4.68e5 0.08 7.82e6 0.9 16.7

Reference for EAR1 : FLUKA Simulations with fission collimator (d = 8 cm)

FLUKA Simulation for EAR2 8

RESULTSResolution

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FLUKA Simulation for EAR2 9

Time – Energy Relation

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FLUKA Simulation for EAR2 10

Time – Energy Relation

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FLUKA Simulation for EAR2 11

Resolution in comparison with EAR1

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Neutron Energy EAR1 EAR2No Moderator

EAR2With Moderator

FWHM [cm] FWHM [cm] FWHM [cm]

1 eV 3 4 2

1 keV 5.1 8 7

1 MeV 34.1 38 36

Neutron Fluence is reduced by about 32 % if a Moderator in this form is used

Neutron Energy EAR1: 187.5 m EAR2: 18.9 mNo Moderator

EAR2: 18.9 mWith Moderator

ΔE / E ΔE / E ΔE / E

1 eV 3.0e-4 4.3e-3 2.2e-3

1 keV 5.4e-4 8.5e-3 7.5e-3

1 MeV 3.6e-3 4.1e-2 3.9e-2

FLUKA Simulation for EAR2 12

RESULTSCharged Particle Fluence

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FLUKA Simulation for EAR2 13

Charged Particle Fluence

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FLUKA Simulation for EAR2 14

Magnet

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pmax = 1.205 [GeV/c] protons

B = 0.2 [Tm]

Collimator

h = 4.60 [m]

Possible Position for a magnet: Assumed magnet length: l = 1 [m]

FLUKA Simulation for EAR2 15

Photon Fluence

EAR2 EAR1

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FLUKA Simulation for EAR2 16

Arrival Time

EAR2 EAR1

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FLUKA Simulation for EAR2 17

RESULTSCollimation

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FLUKA Simulation for EAR2 18

Neutron Beam Profile

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Collimator:1. 2m Fe: conical shape 2. 1m PE borated: straight with 8 cm diameter

FLUKA Simulation for EAR2 19

RESULTSBeam Dump – Backscattered Neutrons

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FLUKA Simulation for EAR2 20

Beam DumpBackscattered Neutrons

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• 1.5 m of Fe surrounded by• 40 cm of borated PE• 1 mm of Cd at the entrance

FLUKA Simulation for EAR2 21

RESULTSNeutron Fluence at 1.5 m from the target center – Material Irradiation

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FLUKA Simulation for EAR2 22

Neutron Tube has 32 cm diameter at 1.5 m from the target center

Neutron Fluence for Irradiation

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Total: 2.5e10 n / cm^2 / 7e12 ppp

FLUKA Simulation for EAR2 23

Thank you for your attention!

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Energy Interval EAR1 EAR2Without Moderator

Gain

[ n / cm2 / pulse ]

Error[%]

[ n / cm2 / pulse ]

Error[%]

0.1 – 10 eV 5.11e4 0.3 8.01e5 2.6 15.7

0.01 – 1 keV 4.07e4 0.3 1.09e6 1.8 26.8

1 – 100 keV 5.03e4 0.2 1.39e6 1.7 27.6

0.1 – 10 MeV 1.77e5 0.1 2.95e6 1.1 16.7

10 – 100 MeV 2.64e4 0.3 4.03e5 2.7 15.2

> 100 MeV 4.71e4 0.3 8.76e4 5.9 1.9

Total Energy Range

4.68e5 0.08 7.82e6 0.9 16.7

Reference for EAR1 : FLUKA Simulations with fission collimator (d = 8 cm)

Neutron Fluence Comparison