Fluka simulations for secondary ion beams

Chrysostomos ValderanisIlias Efthymiopoulos

C. Valderanis, I.Efthymiopoulos 2

Two parallel approaches in building the simulation

• Full geometry– Includes all active and passive elements of the

beam line– Tracking is handled by Fluka transport– To be used in the future

• Toy monte carlo– Includes target and degrader– Magnetic rigidity selection in an algorithm– To be used for rate predictions

NA61 Collaboration Meeting 11/10/10

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C. Valderanis, I.Efthymiopoulos 4

T2 target and first bends (H – plane)

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The double spectrometer (V – plane)

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Last bends and quads upstream to NA61

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Summary – I : Full geometry

• Dipoles, quadruples, collimators – In working condition

• Missing elements– Target and degrader– Beam instrumentation– Beam pipe

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Toy monte carlo : Geometry

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Target DegraderPb ions

Rigidity selection

Measurments

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Toy monte carlo : Datasets

• [beam] x [target] x [degrader]• [30GeV A] x [4cm C, 40cm Be, 4cm Pb]• [13Gev A] x [4cm C] x [2cm C]

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Light ion fragments. Which one?

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• Radionuclides3≤Z ≤7, 6≤A ≤15,T1/2≥10-6s

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30GeV A Pb ions at T2 target (2*106) T2 target 4cm C

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30GeV A Pb ions at T2 target (2*106) T2 target 4cm C

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30GeV A Pb ions at T2 target(2*106) T2 target 4cm C

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Bρ=3.33P/Z

All ions

(5,11)

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Ion fragment purity at T2 target

Target, Rigidity window) #all-ions #wanted ions ratio #wanted ions per primary (x10-6 )

(5,11) (-1,5%,1,5%) 324770 500 0.15% 250

(5,11) (-1.0%,1.0%) 216590 331 0.15% 165

(5,11) (-1.5%,1.0%) 275430 428 0.16% 214

• Results for 2 × 106 Pb ions on target– 500x for maximum expected beam intensity from SPS (1× 109)

• T2 target = 4cm C

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30GeV A Pb ions at T2 target(2*106)T2 target 4cm C

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All ions

(5,11)

(6,11)

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30GeV A Pb ions at T2 target(2*106) T2 target 40cm Be

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30GeV A Pb ions at T2 target(2*106)T2 target 40cm Be

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All ions

(5,11)

(6,11)

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Ion fragment purity at T2 target for 30GeV A Pb ions

Target/selected ion #all-ions #-wanted ions ratio #wanted ions per primary (x10-6 )

40cm Be(5,11) 133846 2948 2.2% 1474(6,11) 69322 2316 3.3% 1158

4cm C(5,11) 324770 500 0.15% 250(6,11) 69047 405 0.58% 202

4cm Pb(5,11) 202476 175 0.08% 87(6,11) 29350 133 0.45% 66

• Results for 2 × 106 Pb ions on targetFactor : 500 for maximum expected beam intensity from SPS (1×

109)

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13GeV A Pb ions at T2 target(2*106)T2 target 4cm C

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13GeV A Pb ions at T2 target(2*106)T2 target 4cm C ,selection (6,11)

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13GeV A Pb ions at T2 target(2*106)T2 target 4cm C ,selection (6,11)

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13GeV A Pb ions at T2 target(2*106)T2 target 4cm C ,selection (6,11),2cm degrader

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13GeV A Pb ions at T2 target(2*106)T2 target 4cm C ,selection (6,11),2cm degrader

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