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Update of the single photoelectron response file #1238
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Update of the single photoelectron response file #1238
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…in/data/spe_LST1_2022-04-27_AP2.0e-4.dat. See the details in cta-observatory/lst-sim-config#40
thanks @Mitsunari-Takahashi ! |
Is this the single pe pulse shape? Or the single pe integration spectrum? ctapipe_io_lst only uses the single pe pulse shape (to fill it into the The file used currently is
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It's the LST1-PMT output charge spectrum integrated over an extraction time window. I missed the format of the new dat file different from the old one. So please reject this pull request. Sorry, I will correct the file. Before that, could anyone confirm whether the NSB tuning needs the AP-folded spectrum? |
NSB tuning at the waveform level (which is the preferred method) needs both the pulse template (shape) and the amplitude fluctuations. About the APs, I always find it quite confusing to mix them with the spectrum of amplitude fluctuations. It is ok for the NSB, because it is anyway arriving at random times. But for the p.e.'s from C-photons we should never use such a spectrum of amplitude fluctuations including APs, right? The APs produced by p.e.'s from C-photons should not be part of the same event, but produce a delayed signal. So my understanding is that for the specific case of simulating NSB is it fine (even convenient) to include the APs, but not for the simulation of the signal (which of course it is not done in lstchain!). But I am not 100% sure. |
I see, so we should separate these problems. For In addition, to implement the NSB tuning at the waveform level, I understand we need the pulse shape template. I'd like to remark that the AP pulse is shorter than the photon pulse, but probably the difference is negligible. For the Cherenkov photon signal simulation, I agree that the AP should not be folded. Is this a matter of |
Correct
I'd say so... APs are after all just a small part of the noise.
I just checked that it is handled properly in the simulation (I had no doubts). From the sim_telarray documentation: |
The single photoelectron spectrum data
lstchain/data/SinglePhE_ResponseInPhE_expo2Gaus.dat
has an artificial bump in the spectrum due to the analysis method, and we made a new onelstchain/data/spe_LST1_2022-04-27_AP2.0e-4.dat
to remove it. In addition, the new spectrum is folded with the afterpulsing while the old one is not.Please find the details at cta-observatory/lst-sim-config#40.