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Electron Source Simulations for the ILC
Manu LakshmananCornell University
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ILC Electron Source
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Our Simulations• Electron Gun
• Solenoidal Field to focus beam
• First Subharmonic Buncher (SHB-I)
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Photocathode Electron Gun
AI 105
3VKI
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Beam without solenoidal field
nst 160
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Solenoidal field used to focus beam
)(mz
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BunchingT/4
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Simulations of parametersGun bias voltage
140-200kV Initial time pulse length
500ps-1ns
SHB field strength
z
leE
cmL
z
erf
2
332
Focal length w/o space charge
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Bunching as a function of field strength, zE
SHB-I
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SHB-I field strength, needed to compress bunch to 577 ps
Electron Gun Bias Voltage,
140 160 180 200
500 7.58 6.92 8.03 11.12
630 7.46 8.19 8.36 12.06
760 7.66 6.48 7.59 7.81
890 7.20 9.28 7.03 8.69
1020 5.64 6.04 6.83 8.17Initi
al t
ime
pu
lse
len
gth
, mMVEz
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Conclusions and future work
• Modest gun bias voltage (~140 kV) is sufficient.
• The possibility of using one SHB instead of two should be investigated.
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Acknowledgements
• Dr. Axel Brachmann
• SULI Program
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