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HI Brandon, depending on why you are asking the answer may be: 1) If you are just using the calorimeter hits you should not have to know. You should just get a CalorimeterCell object from the event (using LCDEvent.getCalorimeterCell()) and use that to convert the cell id into position, angle etc. http://www-sldnt.slac.stanford.edu/nld/lib/lcd/api/hep/lcd/geometry/CalorimeterCell.html 2) If you want to know because you need to generate your own cell id's then the best documentation is as Norm suggests reading the comments and source code of: hep.lcd.geometry.CalorimeterCellNewTag.java Tony > -----Original Message----- > From: Graf, Norman > Sent: Thursday, July 01, 2004 3:51 PM > To: Drummond, Brandon William; lcd-sim > Subject: RE: cell ids > > Hello Brandon, > It's not very well documented, but this just came up > recently in discussions, so I'll copy what Guilherme Lima > posted recently. > Norman > > > I found hep.lcd.geometry.CalorimeterCellNewTag.java, > which answers some of my previous questions, as I write down > below. There are still remaining questions: > > > The questions are: are there convention behind system > numbers? If so, > > where is this documented? > > > > How many bits are used for sysNo? I vaguely remind having > seen some > > java code using 2-bits for system, plus one bit for > barrel/endcap flag > > and another bit for north/south flag, but I can't find this code > > anymore. > > 3 bits for sysNo > 1 bit for barrel/endcap flag > 7 bits for ilayer > 10 bits for itheta > 11 bits for iphi >