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P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
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Beam-based feedback for LC
• ILC luminosity goal 10**34 / cm**2 / s
3000 or 6000 bunches, spacing 150 - 300ns
DIGITAL FB approach
• CLIC luminosity goal 10**35 / cm**2 / s
c. 100 bunches, spacing c. < 1ns
ANALOGUE FB approach
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P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
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e-
e+
IP beam-based feedback for LC
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P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
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Kicker BPM 1
Digital feedback
Analogue BPM processor
Driveamplifier
BPM 2
BPM 3
e-
FONT4 ILC prototype at KEK/ATF
3 bunches, 140-154ns spacing
1.3 GeV
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P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
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Kicker BPM 1
Digital feedback
Analogue BPM processor
Driveamplifier
BPM 2
BPM 3
e-
FONT4 ILC prototype at KEK/ATF
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P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
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Example (1) of May 2008 Results
low gain medium gain
high gain
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P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
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Example (3) of May 2008 Results
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Slack = 22 ns
Latency
= 154 - slack
= 132 ns
+ 8ns (1/Q)
Bunch 1
Kicker pulse
Bunch 2154ns
Latency Slack
Latency measurement