SC Study
IceCube/EHE Search
/9-string analysis
FADC Baseline Study
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Introduction and ATWD Baseline study
Short summary of this is here,
I have 4 options to be studied for FADC.
- A) zero
- B) Iteration
- C) Average of first 3 bins
- D) Average of first or last 3 bins whichever gives smaller value
This page studies what's the best combination.
And later I repead this study with reduced bin in the next section in Reduced read-out bin number study
FADC - string inclusive
Obtained baselines from different options for different strings.
From the top, the closest to SC string (the same string) and the
lower, the away from the string, thus the expected pulses or NPEs are
decreased.
Note that all in log scale since FADC baseline is relatively stable.
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Obtained baseline distributions with 4 options for 100% SC
runs from string-40 (the same string as SC)
From Left A) zero, B) iteration, C) first 3bin average D) first or last
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string-39
From Left A) zero, B) iteration, C) first 3bin average D) first or last
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string-29
From Left A) zero, B) iteration, C) first 3bin average D) first or last
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string-21
From Left A) zero, B) iteration, C) first 3bin average D) first or last
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estimated NPE from each baseline option
String inclusive.
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String-40
From Left, baseline option A), B), C) and D)
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String-39
From Left, baseline option A), B), C) and D)
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String-29
From Left, baseline option A), B), C) and D)
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String-21
From Left, baseline option A), B), C) and D)
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DOM-wise
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String-40
From Left, baseline option A), B), C) and D)
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String-39
From Left, baseline option A), B), C) and D)
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String-29
From Left, baseline option A), B), C) and D)
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String-21
From Left, baseline option A), B), C) and D)
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For FADC, situation is relatively simple,
- Baseline shift for FADC is small thus option A) the zero baseline is good approximation within 1mV
- There are *huge* undershoots for large pulses, thus niether option B) iteration nor option D) the average of last bin can not be used
- Option C) the average of the first 3 bins are recommended option from DAQ people (at the last collab meeting)
- However as we see in previous page, there were a few DOMLaunch which started after a pulse peak is passed and there are no pre-pulse region.
For FADC,
- Use option D) average of the first 3 bins.
- If the value is not within pluse/minus 0.5 mV, then take option A) zero-baseline to avoid strangely triggered pulses.
- Note that for FADC because of large undershoots, we count value only *above* baseline to get integrated charge while for ATWD, we use both positive and negative entry with an assumption, if we have correct baseline and we don't have any pulse in it, we get zero integrated charge.
Now I apply I3BinNumberReducer onto the i3file I used.
The typical waveforms looks like,
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Large NPE DOMs
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GDOMs
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Baseline and NPE comparison --- FADC
In the following, green and blue are full readout sample and red and pink are reduced readout sample.
Green and red are zero baseline, blue and pink are First 3 bin sample.
These baseline options are zero baseline is always zero and average of first 3 bins must be independent of number of bins.
Thus this is just a test and see how npe change by bin number reduction.
In the closer string, the smaller the npe reduction which is consistent with our expectation.
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FADC String-40 Baseline distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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FADC String-40 NPE distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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FADC String-39 Baseline distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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FADC String-39 NPE distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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FADC String-29 Baseline distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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FADC String-29 NPE distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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FADC String-21 Baseline distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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FADC String-21 NPE distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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Baseline and NPE comparison --- ATWD
Now for the ATWD.
In the following, green and blue are full readout sample and red and pink are reduced readout sample.
Green and red are zero baseline, blue and pink are either lower first or last 3 bin average.
The largest difference is now on String-40, the closest (same) string.
NPE reduction due to reduced redout in this case is about a factor of 2...
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ATWD String-40 Baseline distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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ATWD String-40 NPE distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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ATWD String-39 Baseline distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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ATWD String-39 NPE distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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ATWD String-29 Baseline distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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ATWD String-29 NPE distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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ATWD String-21 Baseline distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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ATWD String-21 NPE distribution
From Left, baseline option A) with full bin, A) with reduced bin, C) with full bin and C) with reduced bin
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Back to Introduction and ATWD...
Atwd Baseline study
send your comments to: aya at hepburn.s.chiba-u.ac.jp