Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave Production
Prof. Rebecca Seviour
Royal Holloway
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
𝒗𝒃𝒆𝒂𝒎 ≲ 𝒗𝒈Energy Transfer from Wave to Beam
𝒗𝒃𝒆𝒂𝒎 ≳ 𝒗𝒈Energy Transfer from Beam to Wave
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Phase constant
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Effective Media
Metamaterial - Pendry/Smith 1990- Veselago 1968
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Effective Media
Kock 1940’s
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Aleksey Tolstoy (1914)
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
<< λ
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
μ
ε
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Wave propagation
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
RFin RFout
Electron Beam
20
dm c γ e vdt
� E
20 1 0
dm c γ e vdt
� E
22 1
1 dγ γ2 dγ
' '
in
20
21
in
out
PeIcmΔγ
dγd
21
PΔP
�
1st order perturbation >> Spontaneous emission
2nd order perturbation >> Stimulated emission
Madey’s Theory
Lorentz's Force
Tan & Seviour, Europhys.Lett.87:34005,2009
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Phase constantTan & Seviour, Europhys.Lett.87:34005,2009
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
20
dm c γ e vdt
� E
20 1 0
dm c γ e vdt
� E
22 1
1 dγ γ2 dγ
' '
in
20
21
in
out
PeIcmΔγ
dγd
21
PΔP
�
1st order perturbation >> Spontaneous emission
2nd order perturbation >> Stimulated emission
Madey’s Theory
Lorentz's Force
Frequency [GHz]
X determined by wave/beam velocity,
X > 0 𝑣𝑏𝑒𝑎𝑚 < 𝑣𝑔
Tan & Seviour, Europhys.Lett.87:34005,2009
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
E field 9.6 GHz π - Mode
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
50 KeV upgrade to our existing electron system
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Yiming Xu and Rebecca Seviour 2012 New J. Phys. 14 013014 doi:10.1088/1367-2630/14/1/013014
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Yiming Xu and Rebecca Seviour 2012 New J. Phys. 14 013014 doi:10.1088/1367-2630/14/1/013014
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Yiming Xu and Rebecca Seviour 2012 New J. Phys. 14 013014 doi:10.1088/1367-2630/14/1/013014
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
1 pC, 10 ps short electron bunches,initial energy 16MeV, repetition frequency 3.429GHz
E B
Peak E field 46.8MV/m Peak B field 120.2 kA/m
acceleration gradient of 32MV/m
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
Novel Materials for Particle Acceleration and EM Wave ProductionR. Seviour
