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Francisco Cabaleiro LEEPCI – Laval University (Canada)
CERN – European Organization for Nuclear Research
Francisco Cabaleiro LEEPCI Laval University (Canada) CERN European - - PowerPoint PPT Presentation
Francisco Cabaleiro LEEPCI Laval University (Canada) CERN European - - PowerPoint PPT Presentation
Francisco Cabaleiro LEEPCI Laval University (Canada) CERN European Organization for Nuclear Research Outline Introduction Objectives R&D Status Methodology Topology Selection Power & Droop
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Outline
- Introduction
- Objectives
- R&D Status
- Methodology
- Topology Selection
- Power & Droop Compensators
- Monolithic Pulse Transformer
- Schedule
2/3/2014 3 CLIC Workshop 2014
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4
Introduction
Nominal pulse voltage Vkn 150 - 180 KV Nominal pulse current Ikn 160 - 195 A Rise & Fall Times trise, tfall 3 ms Settling time tset 5 ms Pulse Length tflat 140 ms Repetition Rate REPR 50 Hz Voltage overshoot Vovs 1 % Flat-top stability FTS 0.85 % Pulse to pulse repeatability PPR 10 ppm Pulse efficiency ŋpulse 95 % PFS electrical efficiency ŋpfs 98 % Modulator global efficiency ŋmod_global 90 %
4
trise FTS Vovs tset t at tfall Vkn
Time [s] Voltage [V]
ideal pulse real pulse
- Pulse Requirements
CLIC Workshop 2014
~1300 modulators of 29MW Total peak power: ~40 GW Average power consumption: ~300 MW
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Objectives
- Optimal Design of a Klystron Modulator for CLIC-DB,
based on a monolithic transformer based topology, capable of:
- Respecting the challenging pulse and efficiency specifications.
- Operating at constant power consumption
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Capacitor charger
V
kly
HV pulse transformer Main S witch (Msw)
Bouncer
klystron modulator
C1
klystron
CLIC Workshop 2014
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R&D Status
- Influence of several modulator parameters
- n active bouncer requirements
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10 30 50 70 90 110 130 150 170 190 210 230 250 200 400 600 800 1000 1200 1400 1600
Bouncer Bandwidth (kHz) Output Voltage Fluctuation (V)
225 mF 250 mF 275 mF 300 mF 325 mF 350 mF 375 mF 400 mF 425 mF 450 mF 475 mF 500 mF 525 mF
Examples:
- HV charger bandwidth
- Transformer droop
- Main capacitor bank size
CLIC Workshop 2014
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R&D Status
- Influence of several modulator parameters
- n active bouncer requirements
- Need for an integrated system approach
- Constrained nonlinear optimization
2/3/2014 7
Active Bouncer requirements Main capacitor bank size Voltage droop in the transformer Capacitor charger bandwidth
CLIC Workshop 2014
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R&D Status
- Methodology
2/3/2014 8 Power Electronics System Design tool Topology Candidate Thermal Analysis Cost & Volume Bandwidth & Ripple Reliability Modularity Redundancy Control Methods Models Experimental Validation with Reduced-Scale Prototypes Integration of Design Tool into an Integrated Opt imal Design E nviromment Considering all Klystron Modulator sub-components Evaluation of other candidate topologies Topology Choice Full Power Prototype: Design & Experimental Validation CLIC Workshop 2014
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R&D Status
- Topology Selection
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a) b)
CLIC Workshop 2014
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R&D Status
- Power & Droop Compensators:
- 300 kW prototype (1kV, 300A).
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Validation & Correction of Mathematical Models and Control Strategies
CLIC Workshop 2014
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R&D Status
- Monolithic Pulse Transformer
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0.3 m 0.8 m
State Variables Vector
Output Voltage Pulse simulation
Dimensioning Model using 2D FEA 2D FEA Identification Equivalent Circuit Thermal Modelling Mechanical Modelling Klystron Rated Operation Point Objective & Contraints Functions Evaluation Non Linear Constrained Optimization Procedure Analytical Dimensioning Model Correction by 3D FEA 3D FEA
CLIC Workshop 2014
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R&D Status
- Monolithic Pulse Transformer
- HV Tests: Determination of expert coefficients
2/3/2014 12
MIDEL & Silicon Oil tests PEEK test Insulation system test
CLIC Workshop 2014
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Schedule
- 2014:
- Beginning of full scale construction: December 2014
- Full Power Testing & Validation: 2015
2/3/2014 13 CLIC Workshop 2014
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