Artificial Material Design for High Power...
Transcript of Artificial Material Design for High Power...
Artificial Material Design for High Power
ApplicationsMs Aimée Hopper
Prof. Rebecca Seviour
International Institute for Accelerator Applications
University of Huddersfield
Material [email protected]
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What is an Artificial [email protected]
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E=0 E E
𝐷 = 𝜖0𝐸 + 𝑃 = 𝜖𝐸
𝐵 = 𝜇0𝐻 +𝑀 = 𝜇𝐻Constitutive
Relations
Electrons
Block of Material
Nucleus
Artificial Media
• Effective Permittivity • Effective Permeability
TWT – High Power [email protected]
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ElectronBeam
RF in
RF Out
h
p
Δh
Phase ConstantY. S. Tan and R. Seviour, EPL (Europhysics Letters),
Volume 87, Issue 3 (2009)http://arxiv.org/abs/1003.5401
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𝛼 =1 − 𝑆11
2 + 𝑆212
2𝑆21
𝑛 =1
𝑘𝑑𝑐𝑜𝑠−1(𝛼)
𝑧 = −1 + 𝑠11
2 − 𝑠212
1 − 𝑠112 − 𝑠21
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𝜀 = 𝑛/𝑧
𝜇 = 𝑛𝑧Sm
ith, D
. R
., e
t al., P
hys.R
ev. B
65.1
9 (
2002)
Experimental Results
𝜇
𝜖
High Power Design – Infinite System
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• Simulations in HFSS
• Bloch-Floquetboundary conditions
• Infinite sheet of unit cells
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Interaction at 9.9GHz|𝑆𝑖𝑗|
S11
S21
𝜇
𝜖
Frequency Dependence of 𝑆11, 𝑆21, 𝜖 and 𝜇
Frequency Dependence of Dispersion and Loss
Loaded Waveguide
• Waveguide Ports
• PEC boundaries
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Magnitude of 𝑆𝑖𝑗 comparing the infinite
system (dotted) to the loaded waveguide
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Larger Loaded Waveguide𝑆 𝑖𝑗
Frequency Dependence of
𝑆𝑖𝑗 , 𝜖 and 𝜇Dispersion and Loss
Frequency [GHz]
S11
S21
𝜖
𝜇
Future Work…
• Particle In Cell Simulations • MAGIC
• Fabricate Structure• Non Trivial
• Cold testing at Low Power
• Hot testing with electron beam
• Hot testing with High Power RF
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Conclusions
• Existing designs of artificial materials can have issues handling high power.• This only gets worse as number of unit cells in the
system increases.
• Engineered a unit cell which enables an interaction with a low power electron beam.
• Engineered a unit cell which exhibits low loss.
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Thanks
Spare Slide 1:More Unit Cells [email protected]
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Spare Slide 2: [email protected]
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