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AGATA S002 and S003 Coincidence Scans. Matthew Dimmock ([email protected]). Overview. Issues with MGS Experimental versus MGS S002 versus S003 Ongoing work. Some issues with MGS. AGATA symmetric geometry. Passivation reduces surface currents. 2mm Isolant. No Isolant. - PowerPoint PPT Presentation
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Matthew Dimmock ([email protected])Matthew Dimmock ([email protected])
AGATAS002 and S003
Coincidence Scans
Overview
• Issues with MGS
• Experimental versus MGS
• S002 versus S003
• Ongoing work
• AGATA symmetric geometry
2mm Isolant No Isolant
• Passivation reduces surface currents
Some issues with MGS
Some issues with MGS• Potential mapping
2mm Isolant No Isolant
• Back region where all charges are collected
due to deformed potential surface
Some issues with MGS
• Electron drift velocity
2mm Isolant No Isolant
• Regions of unsaturated velocity
Some issues with MGS
• Electron drift – not a problem with
calculations but consequence of model
2mm Isolant No Isolant
r = 20mm = 290o
z = 85mm
r = 20mm = 290o
z = 65mm
Some issues with MGS
• “Charge sharing”
Experimental centre contact pulses
Test experimental alignment
Experimental segment 15 (C3) & 33 (F3) pulses
x
y
B3
A3
F3
E3
C1
D3
• Line 1
• T1 aligned
• Good agreement
MGS and experimental centre contact pulses
Experimental versus MGS
MGS and experimental segment 15 (C3) & 33 (F3) pulses
x
y
B3
A3
F3
E3
C1
D3
• Line 1 – real charge
pulses
Experimental versus MGSx
y
B3
A3
F3
E3
C1
D3
• Line 1 – Upper / Lower
ICs
Experimental and MGS segment C4 and F4 image charges
Experimental and MGS segment C2 and F2 image charges
Experimental versus MGSx
y
B3
A3
F3
E3
C1
D3
19mm Experimental and MGS segment F4 image charges
19mm Experimental and MGS segment F2 image charges
Exp, z = 34mm
MGS, z = 34mm
MGS, z = 34mm
Exp, z = 34mm
• Vary MGS to fit experimental
data
MGS and Experimental core pulses
Experimental versus MGSx
y
B3
A3
F3
E3
C1
D3
• Line 2, 7.5o clockwise
B/C
• T1 aligned
• Good agreementMGS and Experimental segment F3 (33) pulses
Experimental versus MGSx
y
B3
A3
F3
E3
C1
D3
Segment E3 (Left) Image Charge Pulse
Segment A3 (Right) Image Charge Pulses
• Line 1 – Upper / Lower
ICs
Experimental versus MGS
• Sum of squares difference for experimental
and MGS data
Experimental versus MGS
• Is sum of squares difference a result of poor
time alignment
S002 Versus S003• Quantify detector twist
Conclusions
• MGS R5.02 is has been used to generate
latest data
• Two MGS data sets will be generated. The
S003 set will factor in twist.
• Basis sets have been partially generated to
produce 3D chi squared difference to see
where MGS fails
• Bart and Benedikt code will be used to find
best parameters.