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Harold G. Kirk Brookhaven National Laboratory Target Considerations for Nufact and Superbeams ISS Meeting RAL April 26, 2006
26

Target Considerations for Nufact and Superbeams

Jan 02, 2016

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Target Considerations for Nufact and Superbeams. ISS Meeting RAL April 26, 2006. Main Study Parameter. Design for: 4 MW. Driving Target Issues. Meson Production Proton Beam Pulse Length Proton Beam Structure. Stephen Brook’s Analysis. Pions. - PowerPoint PPT Presentation
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Page 1: Target Considerations for  Nufact and Superbeams

Harold G. KirkBrookhaven National Laboratory

Target Considerations for Nufact and Superbeams

ISS Meeting

RAL April 26, 2006

Page 2: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Main Study Parameter

Design for:

4 MW

Page 3: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Driving Target Issues

Meson Production Proton Beam Pulse Length Proton Beam Structure

Page 4: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Stephen Brook’s Analysis

Pions counted at rod surface

B-field ignored within rod (negligible effect)

Proton beam assumed parallel Circular parabolic distribution, rod radius

20cm

1cmSolid Tantalum

Protons

Pions

Page 5: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Yield of ± and K± in MARS

2.2

Ge

V

3G

eV

4G

eV

20

Ge

V

30

Ge

V

40

Ge

V5

0G

eV

75

Ge

V

10

0G

eV

12

0G

eV

15

Ge

V

10

Ge

V

8G

eV

6G

eV

5G

eV

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

1 10 100 1000

Proton Energy (GeV)

Pio

ns

or

Ka

on

s p

er

Pro

ton

.Ge

V (

tota

l e

mit

ted

)

pi+/(p.GeV)

pi-/(p.GeV)

pi+/(p.GeV)pi-/(p.GeV)

K+/(p.GeV)

K-/(p.GeV)

•No surprises in SPL region•Statistical errors small•1 kaon 1.06 muons

Finer sampling

Page 6: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

The Study 2 Capture Concept

Maximize Pion/Muon Production Soft-pion Production High Z materials High Magnetic Field Solenoid

Page 7: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

The Study2 Target System

Consider Liquid Hg

Count all the pions and muons that cross the transverse plane at z=50m.

For this analysis we select all pions and muons with KE< 0.35 GeV.

Page 8: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Optimize Soft-pion Production using Hg

Page 9: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Meson KE < 350 MeV at 50m

Mesons/Proton Mesons/Proton normalized to beam power

Page 10: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Process mesons through Cooling

Consider mesons within acceptance ofε┴ = 30π mm and εL = 150π mmafter cooling

350 MeV

Use meson count with KE < 350 MeVas a figure of merit.

Page 11: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Post-cooling 30π Acceptance

Page 12: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Carbon Target Parameters Search

Page 13: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Carbon Target Optimization

Set R=1.25cm; tilt angle = 50 mrad; Length=60cm; Z=-40cm

Page 14: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Proton KE Scan with Carbon

Count mesons within acceptance of

ε┴ = 30π mm and

εL = 150π mm

after cooling

Page 15: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Summary of Results

Compare Meson production for Hg at 24 GeV and 10 GeV

Compare Meson production for C at 24 GeV and 5 GeV

Compare Meson production for Hg at 10 GeV and C at 5 GeV

GeV

GeV

N

N

24

10

GeV

GeV

N

N

24

101.07 1.10

GeV

GeV

N

N

24

5

GeV

GeV

N

N

24

51.90 1.77

GeVC

GeVHg

N

N

5

10

GeVC

GeVHg

N

N

5

101.18 1.22

Page 16: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Conclusion

Optimum Input Proton Beam Energy for Study2a configuration with Hg: 8 to 20 GeVSuperbeam proton beams energies:Mini-boone 8GeVBNL AGS 28 GeVJpark 30 to 50 GeVNumi 60 to 120 GeVCNGS 400 GeV

Page 17: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Driving Target Issues

Meson Production Proton Beam Pulse Length Proton Beam Structure

Page 18: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Proton Beam Pulse Length

Study 2a J. Gallardo, H. Kirk

Page 19: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Conclusion

Optimum Proton Beam Pulse Length for Study2a configuration: 1nsSuperbeam proton beams energies:BNL AGS 28 GeV 10nsNumi 4 μsCNGS 2 x 5 μs

Page 20: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Driving Target Issues

Meson Production Proton Beam Pulse Length Proton Beam Structure

Page 21: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Protons per pulse required for 4 MW

10 Hz 25 Hz 50 Hz

10 GeV 250 × 1012 100 × 1012 50 × 1012

20 GeV 125 × 1012 50 × 1012 25 × 1012

]Hz[feN]eV[E)w(Prep

arc

Proton Beam Intensity

Page 22: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Shock Stress Analysis N. Simos

Page 23: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

SUMMARY of Performance

1 MW/50 Hz

12.0 e+12 ppp

YES

4 MW/50 Hz

48.0 e+12 ppp

NO

1 MW/200 Hz

3.0 e+12 ppp

YES

4 MW/200 Hz

12.0 e+12 ppp

MAYBE

Solid Targets

Page 24: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

5 X 50 Proton Beam Structure

Johnstone, Meot, Rees 10 GeV Proton Beam 50 Hz n = 5 sub-structure => 10 x 1012 protons (10TP) per micro-bunch Accelerate 3 to 10 GeV with harmonic 36 structure and frequency of 13.079-13.417 MHz Adiabatically compress to 2ns Further compress to 1ns with f=80.5 MHz and f=201.25MHz

Page 25: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Pulse Delivery to Target

ΔT = 13 μs => 52 μs bunch structure

Liquid Target

ΔT = 65 μs => 260 μs bunch structure

Solid Target

Page 26: Target Considerations for  Nufact and Superbeams

Harold G. Kirk

Muon Bunch Pattern in Decay Rings

.

148(133)

solid/liquid

80 μ+

80 μ+

80 μ+

80 μ+

80 μ+

127(!30)

127(130)

127(130)

127(130)

2 of 5 interleaved 80 μˉ

bunch trains of 2nd ring

80 full and 127 (or 130) empty RF buckets

> 100ns intervals