Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/calibration/documentation/epic_cal_meetings/200605/MBrusa.pdf Дата изменения: Wed May 14 13:09:56 2014 Дата индексирования: Wed Apr 13 13:13:40 2016 Кодировка: Поисковые слова: каллисто

The problem with double event patterns
(M. Brusa, K. Dennerl ­ MPE)

EPIC CAL/OPS meeting - MPE


Classification of doubles
SA S 2 Right SAS 3 Forward SA S 4 Left SAS 1 Backward

readout direction

split backward (SAS: ,,1") split left (SAS: ,,4") split right (SAS: ,,2")

Forward/Backward doubles: superposition of "true" doubles and "false" doubles (re-emission during read-out) cause shifts in energy calibration

split forward (SAS: ,,3")




SAS 2/4:
(Left/Right doubles)

resemble singles in illumination SAS 1/3: (Forward doubles) different illumination
/Backward



the amount of forward and backward doubles vary across the detector




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)



Q0

Q1



Q3

Q2

XSPEC: fit of the MnK line (5.896 keV) and Al line (1.486 keV) tested against: - different matrices or models used - singles vs. doubles - backward vs. forward - MnK vs. Al


Examples of spectra

(MnK , Rev. #572, Q1)
readout direction

Singles (black) Dbackward (red) Dforward (green)


Singles, Q1 Single gaussian fit to MnK
REV #84

Mn line (5.896 keV)


Singles, Q1

REV #125

Mn line (5.896 keV)


Singles, Q1

REV #249

Mn line (5.896 keV)


Singles, Q1

REV #429

Mn line (5.896 keV)


Singles, Q1

REV #981

Mn line (5.896 keV)


Singles: idigles: nt fMATt MATRIseES used S n ff re di ferenRICES u Cd



Best fit energy line does not depend on the actual matrix used

REV #84


Singles: different MODELS used



Best fit energy line does not depend on the model used

REV #84


Singles vs. Double (1 ­ backward)

REV #84
Singles (blue) Dbackwards (red) readout direction

Systematic trend Position of SAS"1" inconsistent with values for the singles


Singles vs. Double (1 ­ backward)

REV #125
Singles (blue) Dbackwards (red) readout direction

Systematic trend Position of SAS"1" inconsistent with values for the singles


Singles vs. Double (1 ­ backward)

REV #572
Singles (blue) Dbackwards (red) readout direction


Singles vs. Double (1 ­ backward)

REV #857
Singles (blue) Dbackwards (red) readout direction


Singles vs. Double (1 ­ backward) - "detector representation" REV #84
Singles (blue) Dbackward (red)

"Curved shape" wrt singles


Singles vs. Double (1 ­ backward)

REV #125

Systematic in all observations


Singles vs. Double (1 ­ backward)

REV #249

Systematic in all observations


Singles vs. Double (1 ­ backward)

REV #309

Systematic in all observations


Singles vs. Double (1 ­ backward)

REV #429

Systematic in all observations


Singles vs. Double (1 ­ backward)

REV #572

Systematic in all observations


Singles vs. Double (1 ­ backward)

REV #605

Systematic in all observations


Singles vs. Double (1 ­ backward)

REV #709

Systematic in all observations


Singles vs. Double (1 ­ backward)

REV #857

Systematic in all observations


Singles vs. Double (1 ­ backward)

REV #981

Systematic in all observations


Singles vs. Double (1 ­ backward)

REV #1105

Systematic in all observations


Singles vs. Double (backward) vs. Double (left)
Singles (blue) Dbackward (red) Singles (blue) Dleft (red)

REV #125


Singles vs. Double (backward) vs. Double (forward)

Singles (blue) Dbackward (red)

Singles (blue) Dforward (red)

REV #125

No clear trend seen!


Al line Singles vs. Double (1 - backward)
Singles (blue) Dbackward (red)

REV #125


Mn vs. Al lines (singles vs Double 1- backward)
REV #125

MnK line

Al line Smaller amplitude ..but similar shape!


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