Chapter 7 - Destructive and Non Destructive Testing of Material - Copy
NON-DESTRUCTIVE SINGLE PASS MONITOR OF LONGITUDINAL CHARGE DISTRIBUTION
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Transcript of NON-DESTRUCTIVE SINGLE PASS MONITOR OF LONGITUDINAL CHARGE DISTRIBUTION
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NON-DESTRUCTIVE SINGLE PASS MONITOR OF
LONGITUDINAL CHARGE DISTRIBUTION
P.V.Logatchov, P.A.Bak, E.A.Gousev, A.A.Starostenko, N.S.Dikansky,
M.V.Korabelnikov, S.V.Shiyankov, BINP, Novosibirsk, Russia
Contact e-mail: [email protected]
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Z
Y
X
0
Linear
scattering
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22 )(
)()(2)(
zx
dzznzxrx e
z
22 )(
)(2)(
zx
dzznrx e
y
dzznNe )(
dllqI
cx
B
A
<<1.
for
1. >>1,
2. max y
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Single pass beam monitor is sutable tool for:
1. Longitudinal charge distribution2. Beam trains transverse distribution3. Wake-fields observation after the bunch
The longitudinal distribution of charge density in an bunch:
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-10 ..- 60 kV, 5mks
Faraday cup
0..- 800 V, 30 ns
+6.2 kV, 60 ns1.2 GeV bunch
Testing beamCathode MCP Luminophore
CCD
Synchronization system
Videograbber
Electron gunmodulator
MCPmodulator
Luminophoremodulator
LensCorrector
Electron gun
Scheme of LCDM
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The bunch parameters range for better then 10% time resolution of this method:
• bunch peak current: 10 A - 250 A
• bunch length: 20 ps - 2000 ps
• gamma factor: > 30
• offset parameres: < 1/6 of bunch length
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Single bunch regime
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Single bunch regime: offset parameter goes downSingle bunch regime: offset parameter goes down
11
33
22
44
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Collision with the single bunch
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Single bunch regime: offset parameter goes down
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Multi bunch regime: offset parameter goes down1-4: offset parameter > 05 : offset parameter 06-8: offset parameter < 0
88765
4321
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Pictures with wakes
Collision with single bunchTwo bunches
Wakes start to appear
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330 ps
Wake fields 10 ns after bunch
Wake fields150 ns after bunch
The bunch with starting wakes
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330 psDifferent vert. probe beam position
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• Observation of the wake fields corresponded to the frequency of 8714 MHz
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