Changeset 5789 for trunk/MagicSoft

Timestamp:

01/10/05 19:26:23 (20 years ago)

Author:

gaug

Message:

*** empty log message ***

File:

• trunk/MagicSoft/TDAS-Extractor/Performance.tex (modified) (3 diffs)

trunk/MagicSoft/TDAS-Extractor/Performance.tex

@@ -275 +275 @@
 there is a considerable difference for all shown non-standard pulses. Especially the pulses from green 
 and blue LEDs 
-show a clear dependency on the extraction window of the number of photo-electrons. Only the largest 
-extraction windows seem to catch the entire range of (jittering) secondary pulses and get also the ratio 
-of outer vs. inner pixels right.
+show a clear dependency  of the number of photo-electrons on the extraction window. Only the largest 
+extraction windows seem to catch the entire range of (jittering) secondary pulses and get the ratio 
+of outer vs. inner pixels right. However, they (obviously) over-estimate the number of photo-electrons 
+in the primary pulse.
 \par
 The strongest discrepancy is observed in the low-gain extraction (fig.~\ref{fig:phe:23ledsblue}) where all 
-fixed window extractors 
+fixed window extractors essentially fail to reconstruct the correct numbers. This has to do with the fact
+that the tail of the high-gain pulse is usually very close to the low-gain one and thus, the extraction range
+has to be determined with great precision, what the fixed window extractors fail to do due because of the 
+1~FADC slice event-to-event jitter.
 
 
@@ -332 +336 @@
 \end{figure}
 
-One can see that all extractor using a large window belong to the class of extractors being affected 
+One can see that all extractors using a large window belong to the class of extractors being affected 
 by the secondary pulses. The only exception to this rule is the digital filter which - despite of its 
 6 slices extraction window - seems to filter out all the secondary pulses. 
@@ -342 +346 @@
 numbers of photo-electrons. This is due to the fact that the decision to fix the extraction window is 
 made sometimes by an inner pixel and sometimes by an outer one since the camera is flat-fielded and the 
-pixel carrying the largest non-saturated peak-search window is more or found by a random signal 
+pixel carrying the largest non-saturated peak-search window is more or less found by a random signal 
 fluctuation. However, inner and outer pixels have a systematic offset of about 0.5 to 1 FADC slices. 
 Thus, the extraction fluctuates artificially for one given channel which results in a systematically