INJECTION BEAM LINE OPTIMIZATION at COSY March 6, 2019 Benat - - PowerPoint PPT Presentation

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INJECTION BEAM LINE OPTIMIZATION at COSY March 6, 2019 Benat Alberdi (on behalf of JEDI collaboration) IKP-2, FZ-Juelich 0 / 27 Outline COSY facility overview Beam source JULIC Cyclotron Injection Beam Line Injection Optimization IBL

SLIDE 1

INJECTION BEAM LINE OPTIMIZATION at COSY

March 6, 2019 Benat Alberdi (on behalf of JEDI collaboration) IKP-2, FZ-Juelich

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SLIDE 2

Outline

COSY facility overview

Beam source JULIC Cyclotron Injection Beam Line Injection

Optimization

IBL optimization Tracking Emittance measurement

Next steps

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SLIDE 3

Facility overview

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SLIDE 4

Facility overview

SLIDE 5

Facility overview

p = 0.3 − 3.7 GeV/c L = 184 m

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SLIDE 6

Facility overview

p = 0.3 − 3.7 GeV/c L = 184 m

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Beam source

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SLIDE 8

Beam source

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SLIDE 9

Beam source

2.0-4.5 KeV/A beams. Polarization up to 80%.

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SLIDE 10

JUelich Light Ion Cyclotron (JULIC)

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JUelich Light Ion Cyclotron (JULIC)

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JUelich Light Ion Cyclotron (JULIC)

Originally built for light ions up to Ar, nowadays only H− and D−. 700 tons of iron. f = 20 − 30MHz. < B >max= 1.35T

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SLIDE 13

JUelich Light Ion Cyclotron (JULIC)

Originally built for light ions up to Ar, nowadays only H− and D−. 700 tons of iron. f = 20 − 30MHz. < B >max= 1.35T

Extraction

45 MeV H− or 76 MeV D− beams. 20ms cycles.

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SLIDE 14

Injection Beam Line (IBL)

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SLIDE 15

Injection Beam Line (IBL)

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Injection Beam Line (IBL)

Provides the connection between JULIC cyclotron and COSY. It is 94m long. 30mm of vertical offset. Composed by 42 quadrupole magnets, 12 dipole magnets and 14 steerer magnets. Diagnostic tools included along the IBL: 8 profile grids and 3 phase probes. Injection dipole at the end.

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SLIDE 17

Injection Dipole

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SLIDE 18

Injection Dipole

Injection in COSY is performed by stripping injection into a "distorted

rbit".

Injection dipole is responsible to align the beam coming from the cyclotron with the beam cycling in COSY.

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SLIDE 19

Injection Dipole

Injection in COSY is performed by stripping injection into a "distorted

rbit".

Injection dipole is responsible to align the beam coming from the cyclotron with the beam cycling in COSY.

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SLIDE 20

Injection

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SLIDE 21

Optimization

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SLIDE 22

Optimization

Overview

The goal is to make the injection of particles into COSY as efficient as

possible. Steps:

Develop a model for the IBL. Match design specifications. Control injection point params. Match IBL emittance with COSY acceptance.

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SLIDE 23

Optimization

Overview

The goal is to make the injection of particles into COSY as efficient as

possible. Steps:

Develop a model for the IBL. Match design specifications. Control injection point params. Match IBL emittance with COSY acceptance.

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SLIDE 24

Injection optimization

IBL

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Injection optimization

IBL

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Injection optimization

IBL

Not all the quadrupoles are independent → 12 free parameters.

Constraints

Optimized according to INTERATOM design: Sections 2,4,6: FODO structures. Sections 1, 3+4+5 and 7 achromats. Section 8 controls injection.

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SLIDE 27

Injection optimization

IBL and tracking

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SLIDE 28

Injection optimization

IBL and tracking

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SLIDE 29

Injection optimization

IBL and tracking

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SLIDE 30

Injection optimization

IBL and tracking

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SLIDE 31

Injection optimization

Tracking at COSY

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SLIDE 32

Injection optimization

Tracking at COSY

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SLIDE 33

Injection optimization

Tracking at COSY

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SLIDE 34

Combined tracking

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SLIDE 35

Injection optimization

Emittance measurement

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SLIDE 36

Injection optimization

Emittance measurement

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SLIDE 37

Injection optimization

Emittance measurement

M = 1 D 1

·
cos(

√ KL)

1 √ K sin(

√ KL) − √ K sin( √ KL) cos( √ KL)

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SLIDE 38

Injection optimization

Emittance measurement

M = 1 D 1

·
cos(

√ KL)

1 √ K sin(

√ KL) − √ K sin( √ KL) cos( √ KL)

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SLIDE 39

Injection optimization

Emittance measurement

M = 1 D 1

·
cos(

√ K′L)

1 √ K′ sin(

√ K′L) − √ K′ sin( √ K′L) cos( √ K′L)

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SLIDE 40

Injection optimization

Emittance measurement

Plot of beam size squared vs quadrupole strength for Q17, Y axis.

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SLIDE 41

Outlook

The planned upcoming steps for optimizing the injection are: Analyze the injection dipole. Find steerer magnets which allow for independent X and X’ variation of the injected beam in the stripping foil. Combine IBL and COSY in a simulation for a full tracking, including the

rbit bump at injection.

Match phase space at IBL exit with COSY acceptance. Improve the emittance measurement at IBL. Look for other methods.

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SLIDE 42

Thank you!

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SLIDE 43

References

R. Gebel, R. Brings, O. Felden, R. Maier, S. Mey, D. Prasuhn (2013)

20 years of JULIC operation as COSY’s injector cyclotron Proceedings of Cyclotrons 2013, Vancouver, BC, Canada.

C. Weidemann (2016)

COSY injection and tuning Workshop on Beam Dynamics and Control studies at COSY.

A. T. Green, Y. M. Shin (2015)

Implementation of quadrupole-scan emittance measurement at Fermilab’s Advanced Supercomputing Test Accelerator (ASTA) 6th International Particle Accelerator Conference.

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Spare slides

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Spare slides

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Spare slides

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Spare slides

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