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I'm really sorry, but something came up and I can't partecipate the meeting. Please write me for clarifications on the questions I asked or any related matter. L. Il 02/10/14 15:33, Luca Colaneri ha scritto: > Hello everybody, > I have a few things to ask you related to the calibration with FEE. > It's a lot of stuff, I don't expect an answer right away, maybe we > could discuss some of these topics during today's meeting. > I'd like to give an update next Wednesday, so there's time to answer. > > > 1)At which point of the simulation can I found "uncalibrated" data? I > mean, for example, after the readout simulation I can plot the > histogram of the seedhit energy, can I have the same histogram but > with the 4096 dst channels values? I need those because.. > > 2)When we'll have real data, I will have to fit those histograms and > associate the fitted values to the calibration points I'll have set. > At which point of the reconstruction will this be done? > > 3)Up to now, I've been getting the information from the simulated data > out (in a very inelegant way, I must confess) and analyzed and fitted > it with root. When we will have to calibrate the real data, will it > have to be all within hps-java? I've got no idea of how to perform > fits within the java framework.... > > now about the calibration points > > 4)I've been simulating the data using these drivers: > > <driver name="CalibrationDriver" > type="org.hps.conditions.deprecated.CalibrationDriver"> > <driver name="EcalReadout" > type="org.hps.readout.ecal.FADCEcalReadoutDriver"> > <driver name="EcalConverter" > type="org.hps.recon.ecal.EcalRawConverterDriver"> > <driver name="EcalClusterer" type="org.hps.recon.ecal.GTPEcalClusterer"> > > clusters are needed just to select the FEE, the information I use is > the SeedHit energy. Is this procedure ok to set the calibration > points? i.e. is the energy simulated in this way the closest possible > to the real signal? > > 5)which data should I use to set the points? > I've been doing my studies on this set here: > /mss/hallb/hps/production/slic/beam-tri/2pt2/egsv3-triv2-g4v1_s2d6-readout20140522_[1-2500].slcio > (i.e. the slic output available on tape at JLAb), but if I get it > right, this has been done using v6 geometry. To confront v6, v7 and > v8, I've reconstructed 50 stdhep files ( about 0.1 second of beam) > using the three geometries to confront them. Unfortunately the > statistics is very low, so I can confront only some crystals, but in > those with enough population the differences between the three > geometries is low. For example, having around 5000 entries in the > histrograms, the differece between v7 and v3 is around 1% and between > V7 and V8 is around 0.5%. 1% difference meand a difference of about 15 > MeV in energy, which is pretty low, and I think we can live with that. > What do you think? > > > > 6)Once I have the point, where should I put them? > > > and now on positrons > > 7)I've discussed with John the possibility to calibrate the shadowed > crystals using positrons in a FEE-fashioned way: taking the seed hit > spectrum of the positrons and dividing it by their momenta given by > the SVT, will give a distribution very similar to the one of FEE. In > the picture you can see it for crystal nr 4 (ix=-20, iy=5). > > To generate these histograms I've used the reconstrucetd events > available on tape, specifically the "trigger tridents with pileup". > > I think a calibration with positrons is possible, but is way more > complicated since we need information from both the Ecal and the SVT, > so it has to be performed after the reconstruction. > do we want to do it? is it really doable? How precise can it be (I'm > asking the SVT guys, since it depends mostly on the momentum > resolution)? Which MCdata should we use to set the points? > > > > This is pretty much it. > thanks to everybody, any intel will be highly appreciated! > > L. > > > ------------------------------------------------------------------------ > > Use REPLY-ALL to reply to list > > To unsubscribe from the HPS-SOFTWARE list, click the following link: > https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1 > -- Luca Colaneri Dipartimento di Fisica Universita' degli Studi di Roma Tor Vergata Via della Ricerca Scientifica s.n.c. 00133 Roma +39 06 72594560 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1