Update on Analysis and Simulations of Beam Tilt ......2007/05/07 · 23/04/2007 Beam Dynamics...
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23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth Update on Analysis and Simulations of Beam Tilt Measurements in BC2 - Part 1 - Christopher Gerth, Kirsten Hacker, Eduard Prat
Transcript of Update on Analysis and Simulations of Beam Tilt ......2007/05/07 · 23/04/2007 Beam Dynamics...
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
Update on Analysis and Simulations of Beam Tilt Measurements in BC2
- Part 1 -
Christopher Gerth, Kirsten Hacker, Eduard Prat
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
Outline
1. Introduction / Experimental Setup
2. On-crest operation
3. Bunch tilt measurements
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
1) SR Camera Measurements
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5-0.3
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z [m]
x [m
]Reference orbit for bend angle -20 deg.
BPMOTR
SR camera
Horizontal position of the electron beam is related to the beam energy x = R16 * ∆E/E (x = 10 mm ≅ ∆E/E = 3%)
At location of SR camera bunch appears as if ‘streaked horizontally’
-5 -4 -3 -2 -1 0 1 2 3 4 5-5
0
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10
z [mm]
x [m
m]
10 m
m
9o off-crest
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
1) New SR Port and Camera
Alignment Laser18o bend angle
Movement of mirror and camera needs to be automated
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
1) Layout New SR port
16o – 20.5o
mirror
Fast MCP Detector (single bunch resolution)
ICCD Camera (single bunch)
Alignment laser mirror
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
2) On-crest
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x [Pixel]
Bin
Con
tent
[arb
. uni
ts]
Horizontal Profile
Simulation:Off-crest phase: 2deg
Image of old test camera:Pronounced C shape!
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
3) Tilt Measurement: Data Evaluation
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8 deg off-crest in ACC1Positive bump
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No bump
Negative bump5
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23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
3) Tilt Measurement: Data Evaluation
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Step 1) Find region of interest
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Step 2) Find region of interest
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Step 3) Find slice centre
Step 4) Linear Fit of slice centers gives tilt
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
3) Tilt Measurement: Data Evaluation
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Bump: 2.5
Bump: 0.0
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Bump in 9ACC1 [mm]
Bum
p de
pend
ent t
ilt a
t D3B
C2
[deg
]
SR Camera BC2: Bunch tilt measurement 24-Jan-2007
Fitdata points
Bump: -2.5
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
3) Tilt Measurement: Data Evaluation
Raw data
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Bump in 9ACC1 [mm]
Bum
p de
pend
ent t
ilt a
t D3B
C2
[deg
]
SR Camera BC2: Bunch tilt measurement 24-Jan-2007
Fitdata points
Simulation by Kirsten Hacker
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
3) Tilt Measurement: Data Evaluation
-4 -3 -2 -1 0 1 2 3 4-2
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Bump in 9ACC1 [mm]
Bum
p de
pend
ent t
ilt a
t D3B
C2
[deg
]
SR Camera BC2: Bunch tilt measurement; # of slices: 19, Fit range: 5 - 15
systematic errorstatistical errorlinear fitsimulation
Raw data!
Measurement of20/02/2007 included
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
3) Measurement: Camera Tilt
Trim coil H2BC2 used to steer the beam horizontally
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Horizontal Beam Position [mm]
Ver
tical
Bea
m P
ositi
on [m
m]
2007-03-13T070419-H2BC2TEST, SR Camera BC2: tilt 8.2 mrad
Linear fitdata points
Tilt of 8.2 mrad between Trim Coil and Camera!
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
4) Tilt Measurement: Comparison with Simulation
-4 -3 -2 -1 0 1 2 3 4-2
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-1
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Bump in 9ACC1 [mm]
Bum
p de
pend
ent t
ilt a
t D3B
C2
[deg
]
SR Camera BC2: Bunch tilt measurement; # of slices: 19, Fit range: 5 - 15
systematic errorstatistical errorlinear fitsimulation
1) Camera tilt corrected2) Shifted to simulation Result at 0 mm bump
23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
4) Tilt Measurement: Comparison with Simulation
B um p: 2.2 m m
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B um p: -2 .2 m m
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B um p: -2 m m
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B um p: 2 m m
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23/04/2007 Beam Dynamics Seminar: Update on Bunch Tilt Measurements Christopher Gerth
4) Tilt Measurement: Comparison with Simulation
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Tilt Intensity Profile
Simulation
Measurement
