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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. IP beam-based feedback for LC. e+. e-.
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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 P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
IP beam-based feedback for LC e+ e- P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
FONT4 ILC prototype at KEK/ATF Kicker BPM 1 BPM 2 BPM 3 e- 1.3 GeV Drive amplifier Analogue BPM processor 3 bunches, 140-154ns spacing Digital feedback P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
FONT4 ILC prototype at KEK/ATF Kicker BPM 1 BPM 2 BPM 3 e- Drive amplifier Analogue BPM processor Digital feedback P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
Example (1) of May 2008 Results low gain medium gain high gain P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
Example (3) of May 2008 Results P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
Bunch 1 Bunch 2 154ns Latency Slack Kicker pulse Slack = 22 ns Latency measurement Latency = 154 - slack = 132 ns + 8ns (1/Q)