sPHENIX HCal discussion

[Eric Mannel <mannel AT bnl.gov>]

Martin-

I will provide the tower to digitizer mapping, for both the EMCal and HCal.

Eric

On 1/7/22 4:01 PM, Martin Purschke via sPHENIX-HCal-l wrote:
> Hi Stefan,
>
> you need to be prepared to map to this from the PacketId and in-packet 
> offset as I described in yesterday's CollMeeting talk (and that you 
> are familiar with from PEHNIX). You have 128 channels (two digitizers 
> worth) per packet unless the plan has changed.
>
> As you saw, Saif has already made some mappings etc from the 
> digitizers for the calibrations, and the packet is the same as for the 
> EmCal (that has 192channels, 3 digis worth).
>
> Best,
>     Martin
>
> On 1/7/22 15:39, Stefan Bathe via sPHENIX-HCal-l wrote:
> > Hi Eric, Chris, All,
> >
> > Thanks for the feedback.
> > OK, looks like we should go with a tower ID based on the digitizer 
> > channels (blocks of 0-63 channels overarching four blocks of 16 
> > channels (sector thirds of four different sectors), which we map into 
> > an integer ID that increments in both eta and phi.  The (eta, phi) ID 
> > can then easily be translated into actual eta and phi. How the tower 
> > ID blocks are ordered will eventually be determined by how the 
> > Meritec cables will be plugged in, which isn’t decided yet, it sounds 
> > like.
> >
> > Regards,
> > Stefan
> > -
> > --------------------------------------------------------------------------------- 
> >
> > Stefan Bathe
> > Professor of Physics
> > Baruch College, CUNY
> > and RIKEN Visiting Scientist
> >
> > Baruch:                                     BNL:
> > 17 Lexington Ave                      Bldg. 510
> > office 940                                  office 2-229
> > phone 646-660-6272                phone 631-344-8490
> > ---------------------------------------------------------------------------------- 
> >
> >
> >
> >
> > > On Jan 5, 2022, at 08:39, pinkenburg via sPHENIX-HCal-l 
> > > <sphenix-hcal-l AT lists.bnl.gov> wrote:
> > >
> > > Hi Stefan,
> > >
> > > I looked at the presentations and they are a bit opaque to me but I 
> > > think I get the general idea. I would make the software a secondary 
> > > thought - there will always be some mapping to translate a channel 
> > > to row/column, even if it is some one to one. In terms of how to set 
> > > up the channel numbers I would concentrate more on 
> > > monitoring/debugging needs when using raw data. If e.g. you run some 
> > > packet ddump and the channel number tells you directly where some 
> > > given tower is located rather than going through some geometry 
> > > translation, there is value in that - or if it is easier to make a 
> > > connection between slow control and a given tower.
> > >
> > > Not sure if this helps - whatever makes running the hcal easier and 
> > > more bullet proof should be done. Software can always be recompiled 
> > > if you got something wrong even after you are done taking data.
> > >
> > > Chris
> > >
> > >
> > > On 1/4/2022 9:10 PM, Stefan Bathe via sPHENIX-HCal-l wrote:
> > > > Dear All, (specifically Xiaochun, Eric, Chris)
> > > >
> > > > Xiaochun asked in today’s HCal Meeting about the HCal channel 
> > > > mapping for his Geant simulation.  As far as I can tell, this was 
> > > > last discussed in the 8/27/19 HCal Meeting:
> > > >
> > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__indico.bnl.gov_event_6688_&d=DwIGaQ&c=dTXc8cCP8suVpClwB1HRHQACHN4UFMgL7MtSjCbKyts&r=VpzLtnjcGB03vfJuG_p478bcDf7zDOFn2OeUM-jusdY&m=HOtxraNOUgIc4-76m05ZxyZtpgYw4n-p8fGrdxsrtWg&s=9RxZH7QPTVmIlD3px64gHbUwypaf0HdiI0LEJhwZ8aQ&e= 
> > > >
> > > > where both Eric and I gave presentations on our ideas of how to map 
> > > > hardware channels to digitizer channels.  I think we basically 
> > > > agreed.  In the end, though, I think, it might be up to the 
> > > > software group (Chris?) to decide which numbers to assign to the 
> > > > channels.  I guess the two options would be to either adopt the 
> > > > digitizer channel numbering (no additional map needed, but 
> > > > geometrically more complex) or to have numbers simply increment in 
> > > > z and phi (geometrically simple, but additional map needed).
> > > > The other open question is where to start counting. Naturally one 
> > > > would like to start counting at phi = 0 (and at the South end, so 
> > > > along the z axis).  But the sector at phi = 0 (and at phi = 180 
> > > > degrees) have their outer radius combs vertical.  Therefore phi = 0 
> > > > is in the center of a sector, not at the edge.  This would 
> > > > introduce an offset with respect to the digitizer channel number, 
> > > > which is ugly.  The answer to this question might also depend on 
> > > > which sectors get plugged into which digitizer boards/crates, which 
> > > > Eric and Steve would know.  (I’m saying this because it might make 
> > > > sense to start counting at channel 0 of a digitizer board.)
> > > >
> > > > Regards,
> > > > Stefan
> > > >   -
> > > > --------------------------------------------------------------------------------- 
> > > >
> > > > Stefan Bathe
> > > > Professor of Physics
> > > > Baruch College, CUNY
> > > > and RIKEN Visiting Scientist
> > > >
> > > > Baruch:                                     BNL:
> > > > 17 Lexington Ave                      Bldg. 510
> > > > office 940                                  office 2-229
> > > > phone 646-660-6272                phone 631-344-8490
> > > > ---------------------------------------------------------------------------------- 
> > > >
> > > >
> > > >
> > > >
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> > >
> > > --
> > > *************************************************************
> > >
> > > Christopher H. Pinkenburg    ;    pinkenburg AT bnl.gov
> > >                 ; 
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--
Eric J. Mannel, Ph.D.
Research Engineer
Dept of Physics/PHENIX
Brookhaven National Laboratory
631/344-7626 (Office)
914/659-3235 (cell)