A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg,...
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Transcript of A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg,...
![Page 1: A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006.](https://reader036.fdocuments.in/reader036/viewer/2022070305/551410b5550346dd488b5065/html5/thumbnails/1.jpg)
A special large aperture BPM at FLASH
Nicoleta Baboi
for Kirsten Hacker
BPM Workshop, Lüneburg, Nov. 30, 2006BPM Workshop, Lüneburg, Nov. 30, 2006
![Page 2: A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006.](https://reader036.fdocuments.in/reader036/viewer/2022070305/551410b5550346dd488b5065/html5/thumbnails/2.jpg)
FLASH
• 0.5-1nC / bunch
• 1 MHz … 100 kHz, up to 800 s
• up to 700 GeV (later 1 GeV)RF gun
FEL experimental
area
bypass
4 MeV 150 MeV 450 MeV 1000 MeV
undulatorscollimator
bunch compressorLaser
bunch compressor
accelerator modules
250 m
![Page 3: A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006.](https://reader036.fdocuments.in/reader036/viewer/2022070305/551410b5550346dd488b5065/html5/thumbnails/3.jpg)
Magnetic chicanes
bunch compression
x = R16*E/E
![Page 4: A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006.](https://reader036.fdocuments.in/reader036/viewer/2022070305/551410b5550346dd488b5065/html5/thumbnails/4.jpg)
Energy stability
• Energy jitter position jitter in dispersive sections (e.g. magnetic
chicanes) arrival-time jitter after chicane
• Requirement– timing jitter < 30 fs energy jitter < 10-4 (35 m
position jitter in BC)
• Use BPM to measure position jitter– resolution: 5 m (single bunch)– challenge: large horizontal aperture in BC2
unconventional design needed
![Page 5: A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006.](https://reader036.fdocuments.in/reader036/viewer/2022070305/551410b5550346dd488b5065/html5/thumbnails/5.jpg)
BPM for the Bunch Compressor
beam
stripline vacuumstripline vacuumStripline Vacuum
Beam
beam
tapering
SMA outputRF
pulses
beam
tapering
SMA output
Beam
Tapering
SMA output RF
Pulses
cannot reach 5 m res. with analogue electronics use optical method
![Page 6: A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006.](https://reader036.fdocuments.in/reader036/viewer/2022070305/551410b5550346dd488b5065/html5/thumbnails/6.jpg)
BPM installed in BC2
Compact!
Thanks to:
Jan HauschildtDirk NoelleSilke VilcinsHolger SchlarbNils MildnerChristopher GerthAnd many more…
![Page 7: A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006.](https://reader036.fdocuments.in/reader036/viewer/2022070305/551410b5550346dd488b5065/html5/thumbnails/7.jpg)
T1-T2=T3
D=T3*c
dE/E=D/R16T1
T2
T3
EBPM
~300mm
![Page 8: A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006.](https://reader036.fdocuments.in/reader036/viewer/2022070305/551410b5550346dd488b5065/html5/thumbnails/8.jpg)
0 0.5 1 1.5 2
-30
-20
-10
0
10
20
30
simulation and oscilliscope readout
time (ns)
Vo
lts
scopesimu
0 0.2 0.4 0.6 0.8 1
-200
-100
0
100
200
simulation and oscilliscope readout
time (ns)
Vo
lts
40 GHz
8 GHz
beam
stripline pickup
resolution < 3um
![Page 9: A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006.](https://reader036.fdocuments.in/reader036/viewer/2022070305/551410b5550346dd488b5065/html5/thumbnails/9.jpg)
-15 -10 -5 0 5 10 15-6
-4
-2
0
2
4
6Beam position ( = 18.0 deg)
delta [%]
po
sitio
n (
cm)
R16T166R3666
-0.4 -0.2 0 0.2 0.4 0.6 0.8-40
-30
-20
-10
0
10
20
30
40
time (ns)
Vo
lts
chicane BPM scope traces for 12-16 MV/m gradient
~ 150 um resolution => 5*10-4 resolution
Scope in tunnel
![Page 10: A special large aperture BPM at FLASH Nicoleta Baboi for Kirsten Hacker BPM Workshop, Lüneburg, Nov. 30, 2006.](https://reader036.fdocuments.in/reader036/viewer/2022070305/551410b5550346dd488b5065/html5/thumbnails/10.jpg)
-20 -15 -10 -5 0
0.9
1
1.1
1.2
1.3
1.4
1.5BPM slope
phase (deg)
slo
pe
at z
ero
cro
ssin
g (
V/p
s)
-25 -20 -15 -10 -5 00
0.5
1
1.5
2
2.5
3Beam position ( = 18.0 deg)
phase (deg)
po
sitio
n (
cm)
Scope in tunnel
Dphase = (-Etot+Egun+Eacc1*cos(pi*phase/180)) Etot
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12 13 14 15 1655
60
65
70
75
80BPM amplitude
gradient (MV/m)
am
plit
ud
e (
V)
12 13 14 15 160.9
1
1.1
1.2
1.3
1.4
1.5
1.6BPM slope
gradient (MV/m)
slo
pe
at z
ero
cro
ssin
g (
V/p
s)
-15 -10 -5 0 5 10 15-6
-4
-2
0
2
4
6Beam position ( = 18.0 deg)
delta [%]
po
sitio
n (
cm)
R16T166R3666
-0.4 -0.2 0 0.2 0.4 0.6 0.8-40
-30
-20
-10
0
10
20
30
40
time (ns)
Vo
lts
chicane BPM scope traces for 12-16 MV/m gradient
~ 150 um resolution => 5*10-4 resolution
Scope in tunnel