clic drive beam injector bunching system sh. sanaye h. 1,2, s. doebert 2, s. h. shaker 1,2...
TRANSCRIPT
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CLIC Drive Beam Injector Bunching System
Sh. Sanaye H.1,2, S. Doebert2, S. H. Shaker1,2
1. Institute For Research in Fundamental Science (IPM), Tehran, Iran
2. CERN, Geneva, Switzerland
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Contents
1. Introduction
2. Sub-harmonic bunching system
3. Travelling wave tapered buncher
4. Comparison with previous model
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1. Introduction 1
1. Introduction1.1 CLIC Drive Beam time structure
Main pulse consists of 24 bunch trains of 244ns length.
Each of bunch trains consist of 2922 bunches with a time separation corresponds to 12 GHz.
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1. Introduction 2
1.2 Phase coding
Only every second bucket is occupied.
About 5% of particles captured in wrong buckets, called satellite bunches.
∆Ф0=180 o
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1. Introduction 3
1.3 Drive Beam Complex I = 24×4.2A=100.8Af = 24×0.5GHz=12GHz
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2. Sub-harmonic bunching system 2.1 General layout of bunching system
2. Sub-harmonic bunching system 4
2.2 Thin lens approximation
To maximize the population of the particles in the acceptance of the buncher.
To minimize the population of satellite bunches.
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2. Sub-harmonic bunching system 5
2.3 Velocity modulation bunching
Phase Space Phase Spectrum
Before SHBJust after SHBAt point P PARMELA
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2. Sub-harmonic bunching system 6
2.4 Optimization of the thin lens system
In drift section: In SHB(thin lens):
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2.4 Optimization of the thin lens system
2. Sub-harmonic bunching system 7
Phase Space Phase Spectrum
Before SHB1After SHB1Before SHB2After SHB2Before SHB3After SHB3At point P120o
93.1%
Satellite population = 4.4%
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2.5 The space charge effect The effect of the space charge forces is investigated in various configuration of the system.
2. Sub-harmonic bunching system 8
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2.5 The space charge effect
2. Sub-harmonic bunching system 9
Ignoring the space charge With the space charge
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2.5 The space charge effectThe phase space at the entrance of buncher
2. Sub-harmonic bunching system 10
120o
93.1%
Satellite population = 4.4%
120o
92.6%
Satellite population = 4.7%
Ignoring the space charge With the space charge
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2. Sub-harmonic bunching system 11
2.6 Travelling wave SHBs
Thin lens SHB Travelling Wave SHB
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2. Sub-harmonic bunching system 12
2.6 Travelling wave SHBs
Thin lens SHB Travelling Wave SHB
120o
92.6%
Satellite population = 4.7%
120o
93.3%
Satellite population = 4.2%
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3.Travelling wave tapered buncher 13
3.Travelling wave tapered buncher3.1 Longitudinal dynamics in TW buncher
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3.Travelling wave tapered buncher 14
3.Travelling wave tapered buncher3.2 Optimization result
±11.5o
90.3%
Satellite population = 3.8%
±1M
eV
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4.Comparison with previous model 15
4.Comparison with previous model
Work in progress
Previous model Current model
Satellite population = 4.9% Satellite population = 3.8%
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Tanks for your attention