the problem with double event patterns (m. brusa, k. dennerl – mpe) epic cal/ops meeting - mpe
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![Page 1: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/1.jpg)
The problem with double
event patterns
(M. Brusa, K. Dennerl – MPE)
EPIC CAL/OPS meeting - MPE
![Page 2: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/2.jpg)
Classification of doubles
read
out
dir
ect
ion
split right(SAS: „2“)
split left(SAS: „4“)
split forward(SAS: „3“)
split backward(SAS: „1“)
SAS 2Right
SAS 3Forward
SAS 4Left
SAS 1Backward
Forward/Backward doubles:superposition of “true” doublesand “false” doubles (re-emissionduring read-out) cause shifts in energy calibration
![Page 3: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/3.jpg)
SAS 2/4: (Left/Right doubles)
resemble singles in illumination
SAS 1/3: (Forward/Backward doubles) different illumination
the amount of forward and backward doubles vary across the detector
![Page 4: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/4.jpg)
11 CALCLOSED observations
(PN + FF + expo > 20 ks) spanning ~1000 revolutions from #84 to #1105
Spectra extracted in 120 different positions
(30x4 quadrants) for - SINGLES (PATTERN=0) - DOUBLES (PATTERN=1-
4)
XSPEC: fit of the MnKα line (5.896
keV) and Al line (1.486 keV) tested against:
- different matrices or models used - singles vs. doubles - backward vs. forward - MnKα vs. Al
Q0 Q1
Q3 Q2
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Examples of spectra (MnKα, Rev. #572, Q1)
Singles (black)
D-backward (red)
D-forward (green)
readout
dir
ect
ion
![Page 6: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/6.jpg)
Singles, Q1Single gaussian fit to MnKα
REV #84
Mn line (5.896 keV)
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Singles, Q1
REV #125
Mn line (5.896 keV)
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Singles, Q1
REV #249
Mn line (5.896 keV)
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Singles, Q1
REV #429
Mn line (5.896 keV)
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Singles, Q1
REV #981
Mn line (5.896 keV)
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Singles: different MATRICES used
Best fit energy line does not depend on the actual matrix used
Singles: different MATRICES used
REV #84
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Singles: different MODELS used
Best fit energy line does not depend on the model used
REV #84
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Singles vs. Double (1 – backward)
REV #84
Systematic trendPosition of SAS”1”inconsistent with values for the singles
Singles (blue)
D-backwards (red)
readout
dir
ect
ion
![Page 14: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/14.jpg)
Singles vs. Double (1 – backward)
REV #125
Systematic trendPosition of SAS”1”inconsistent with values for the singles
Singles (blue)
D-backwards (red)
readout
dir
ect
ion
![Page 15: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/15.jpg)
Singles vs. Double (1 – backward)
REV #572
Singles (blue)
D-backwards (red)
readout
dir
ect
ion
![Page 16: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/16.jpg)
Singles vs. Double (1 – backward)
REV #857
Singles (blue)
D-backwards (red)
readout
dir
ect
ion
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Singles vs. Double (1 – backward)- “detector representation” -
REV #84
“Curved shape”wrt singles
Singles (blue)
D-backward (red)
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Singles vs. Double (1 – backward)
REV #125
Systematic in allobservations
![Page 19: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/19.jpg)
Singles vs. Double (1 – backward)
REV #249
Systematic in allobservations
![Page 20: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/20.jpg)
Singles vs. Double (1 – backward)
REV #309
Systematic in allobservations
![Page 21: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/21.jpg)
Singles vs. Double (1 – backward)
REV #429
Systematic in allobservations
![Page 22: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/22.jpg)
Singles vs. Double (1 – backward)
REV #572
Systematic in allobservations
![Page 23: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/23.jpg)
Singles vs. Double (1 – backward)
REV #605
Systematic in allobservations
![Page 24: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/24.jpg)
Singles vs. Double (1 – backward)
REV #709
Systematic in allobservations
![Page 25: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/25.jpg)
Singles vs. Double (1 – backward)
REV #857
Systematic in allobservations
![Page 26: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/26.jpg)
Singles vs. Double (1 – backward)
REV #981
Systematic in allobservations
![Page 27: The problem with double event patterns (M. Brusa, K. Dennerl – MPE) EPIC CAL/OPS meeting - MPE](https://reader036.vdocuments.mx/reader036/viewer/2022062516/56649d415503460f94a1b54c/html5/thumbnails/27.jpg)
Singles vs. Double (1 – backward)
REV #1105
Systematic in allobservations
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Singles vs. Double (backward) vs. Double (left)
REV #125
Singles (blue)
D-backward (red)
Singles (blue)
D-left (red)
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Singles vs. Double (backward) vs. Double (forward)
REV #125 No clear trend seen!
Singles (blue)
D-backward (red)
Singles (blue)
D-forward (red)
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Al lineSingles vs. Double (1 - backward)
REV #125
Singles (blue)
D-backward (red)
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Mn vs. Al lines (singles vs Double 1- backward)
REV #125
Smaller amplitude ..but similar shape!
MnKα lineAl line
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Conclusions/Future developments
Singles: - Mn & Al line energy quite stable (in single observation) - Matrices/models adopted does not affect energy
determination
Doubles: - most of problems caused by BACKWARD (systematic
trend wrt to singles) - LEFT/RIGHT: similar to singles - FORWARD: no systematic trend…
Amplitude in Al line smaller than in Mn line - Energy AND spatial corrections needed