P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/081 Beam-based feedback for LC ILC luminosity goal...
-
date post
22-Dec-2015 -
Category
Documents
-
view
214 -
download
0
Transcript of P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/081 Beam-based feedback for LC ILC luminosity goal...
P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
1
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
2
e-
e+
IP beam-based feedback for LC
P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
3
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
P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
4
Kicker BPM 1
Digital feedback
Analogue BPM processor
Driveamplifier
BPM 2
BPM 3
e-
FONT4 ILC prototype at KEK/ATF
P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
5
Example (1) of May 2008 Results
low gain medium gain
high gain
P.N. Burrows BDS/MDI, LCWS08 Chicago, 17/11/08
6
Example (3) of May 2008 Results
Slack = 22 ns
Latency
= 154 - slack
= 132 ns
+ 8ns (1/Q)
Bunch 1
Kicker pulse
Bunch 2154ns
Latency Slack
Latency measurement