Hi Andrea,
What you have is correct, with of course the addition of pedestal subtraction.
This is the convention used by the DAQ for the trigger (and it would make
sense to use the same convention for the gains in the conditions db):
E(MeV) = GAIN * FADC
And the result of the cosmic gain calibration is then:
GAIN = 15 MeV / MEASURED_COSMIC_FADC_PULSE_INTEGRAL
-Nathan
On Dec 12, 2014, at 3:24 AM, Andrea Celentano <[log in to unmask]> wrote:
> Hi,
> when you refer to "energy calibration in <MeV * ADC >", do you mean something like:
>
> - The average cosmic deposition in a crystal is 15 MeV
> - Cosmic signals were measured by the FADC in a xxx samples window width, raw mode. Each of the xxx samples is reported in FADC units (12 bits on 1 V)
> - The integration is performed offline, by summing these xxx samples, so that each signal results in an integral, still in FADC units ("integrated")
> - The distribution of FADC integrals was fitted by a Landau distribution.
> - The MIP peak was evaluated to be at yyy FADC integrated units.
>
> The conversion factor is then:
>
> Signal(MeV) = Signal(FADC integrated units) * 15 MeV / yyy
>
> Does this make sense?
>
> Andrea
>
>
> Il 12/12/2014 02:38 AM, McCormick, Jeremy I. ha scritto:
>> Hi,
>>
>> re: conditions
>>
>> Nathan and I are in the process of loading conditions into the db for the ECAL. We were working on this today...
>>
>> We have a known good channel map.
>>
>> Calibrations (pedestal + noise) and gains should be in there soon if not already for a multi-run range covering the Engineering Run.
>>
>> Nathan indicated that the energy calculation is <MeV * ADC> so we need a Driver that makes the CalHit objects according to that formula. He is going to load gains into the conditions db for that calculation.
>>
>> —Jeremy
>>
>> On Dec 11, 2014, at 5:30 PM, Graham, Mathew Thomas <[log in to unmask]> wrote:
>>
>>> Thanks for the update. Looks like there are some other issues too re: kyle’s latest email.
>>>
>>> On Dec 11, 2014, at 8:29 PM, Sho Uemura <[log in to unmask]> wrote:
>>>
>>>> Andrea wrote the EVIO-LCIO conversion and the raw hit-CalorimeterHit conversion code for mode 7. It works, though it hasn't yet been tested on real (not LED) data or with good pedestals.
>>>>
>>>> But it's not written using LCIO objects, so it needs to be rewritten - otherwise people will run into problems with analysis down the road, and it will be impossible to make mode 7 work in MC. I'm doing a rewrite to fix that. Should be quick, might do it today, will definitely do it tomorrow.
>>>>
>>>> In short, the classes exist for the monitoring app and one-step EvioToLcio jobs (doing EVIO-LCIO conversion and hit recon in one step, not relying on raw hits being written to LCIO) to use this data. I don't know whether there are good conditions yet, and that might be the blocker.
>>>>
>>>> On Fri, 12 Dec 2014, Graham, Mathew Thomas wrote:
>>>>
>>>>> So, do we have the data classes to read this out yet? What?s the plan?
>>>>>
>>>>> Begin forwarded message:
>>>>>
>>>>> From: Nathan Baltzell <[log in to unmask]<mailto:[log in to unmask]>>
>>>>> Subject: data with beam
>>>>> Date: December 11, 2014 at 5:31:33 PM EST
>>>>> To: HPS-SOFTWARE <[log in to unmask]<mailto:[log in to unmask]>>
>>>>>
>>>>> Hi Everyone,
>>>>>
>>>>> Run 3183 has some first data with beam (no target) if anyone wants
>>>>> to take a look. It's on tape and on disk at:
>>>>>
>>>>> /volatile/hallb/hps/data/notgt
>>>>>
>>>>> See log entry:
>>>>> https://logbooks.jlab.org/entry/3312822
>>>>>
>>>>> -Nathan
>>>>>
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>>>>>
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