Detector Sets and Detector elements

In CMSIM we have adopted the standard definition of detector elements which groups into detector sets. The detector set definitions for the given list of detector elements depends only on convenience of their handling -- activating and deactivating by the proposed above mechanism via the FFREAD control card ``SETS''. Thus here we define detector sets corresponding to the subsystem hierarchy in section 1.5. The detector supersets, for example for the whole muon system, is defined by alliance of sets on base of detector types (IDTYPE). The following structure of the detector types (see sequence CMSDID) is used:  

*
* CMS Detector IDentifiers
*
* cmsdid.inc
*
* ***  CMS Detector IDentifiers:
*
*      idtype = XYZUV
*               X  --  subsystem identifier:
*                      1 - track system, 2 - calorimeters, 3 - muon system
*                Y  -  detector type (technology)
*                      1/2/3   - Pixels/ Silicon / MSGC for tracker
*                      1/2/3   - E.M. calorimeter/Hadron/Forward for
*                                calorimeters
*                      1/2/1/2 - DTBX/RPC/CSC/PPC for muon barrel and endcap
*                 Z -  1/2/3   - for barrel/endcap/tail
*                  UV          - superlayer/sublayer number, user dependent,
*                                e.g., double/single side.
*
*Superset        set             subset          detector element
*TRAK = 10000 -> PXLX = 11000 -> PBXL = 11100
*                             -> PFXL = 11200
*                SVTX = 12000 -> TSBX = 12100 -> SWSn = 12110
*                                             -> SWDn = 12120
*                                             -> SWGn = 12130
*                             -> TSFX = 12200 -> SCSn = 12210
*                                             -> SCDn = 12220
*                                             -> SCGN = 12230
*                MSGC = 13000 -> TGBX = 13100 -> GWSn = 13110
*                                             -> GWDn = 13120
*                                             -> GWGn = 13130
*                             -> TGFX = 13200 -> GCSn = 13210
*                                             -> GCDn = 13220
*                                             -> GCGn = 13230
*
*CALO = 20000 -> ECAL = 21000 -> ECBX = 21100
*                             -> ECFX = 21200
*                             -> ESBX = 25100
*                             -> ESFX = 25200
*             -> HCAL = 22000 -> HCBX = 22100
*                             -> HCFX = 22200
*                             -> HTBX = 22300
*             -> VCAL = 23000             PPC
*             -> VCAL = 24000             QFiber
*MUON = 30000 -> MB   = 30100 -> MDBX = 31100  (DTBX)
*                             -> MRBX = 32100  (RPC)
*             -> MF   = 30200 -> MCFX = 31200  (CSC)
*                             -> MRFX = 32200  (RPC)
*
* *** define CMS detector element identifiers
*
      INTEGER        IDSCH                          ! Graphics
      INTEGER        IDTRAK, IDSVTX, IDSVTB, IDSVTF,
     &               IDMSGC, IDMSGB, IDMSGF, IDTKTY
      INTEGER        IDPXLX, IDPXLB, IDPXLF         ! pixel detector
      INTEGER        IDSVBS, IDSVBD, IDSVBG,        ! barrel Silicon/ MGSC
     &               IDMGBS, IDMGBD, IDMGBG         ! Single/Double sided
      INTEGER        IDSVFS, IDSVFD, IDSVFG,        ! endcap Silicon/ MGSC
     &               IDMGFS, IDMGFD, IDMGFG         ! Single/Double sided
*
* *** GRAPHICS
*
      PARAMETER      (IDSCH  = 40 000)
*
* *** TRAK
*
      PARAMETER      (IDTRAK = 10 000)
      PARAMETER      (IDTKTY = IDTRAK/10000)
*                     Pixel,           Barrel,          Endcap
      PARAMETER      (IDPXLX = 11 000, IDPXLB = 11 100, IDPXLF = 11 200)
*                     Silicon,         Barrel,          Endcap
      PARAMETER      (IDSVTX = 12 000, IDSVTB = 12 100, IDSVTF = 12 200)
*        Barrel       Single sided,    Double sided,    Stereo side
      PARAMETER      (IDSVBS = 12 110, IDSVBD = 12 120, IDSVBG = 12 130)
*        Endcap       Single sided,    Double sided,    Stereo side
      PARAMETER      (IDSVFS = 12 210, IDSVFD = 12 220, IDSVFG = 12 230)
*                     MSGC,            Barrel,          Endcap
      PARAMETER      (IDMSGC = 13 000, IDMSGB = 13 100, IDMSGF = 13 200)
*        Barrel       Single sided,    Double sided,    Stereo side
      PARAMETER      (IDMGBS = 13 110, IDMGBD = 13 120, IDMGBG = 13 130)
*        Endcap       Single sided,    Double sided,    Stereo side
      PARAMETER      (IDMGFS = 13 210, IDMGFD = 13 220, IDMGFG = 13 230)
*
* *** CALO
*
      INTEGER IDCALO, IDECAL, IDHCAL, IDVCAL, IDEBAR, IDHBAR, IDECAP,
     &                IDHCAP, IDTAIL, IDVPPC, IDVCQF, IDSB, IDSF
      PARAMETER      (IDCALO = 20 000)
      PARAMETER      (IDECAL = 21 000, IDHCAL = 22 000, IDVCAL = 23 000)
      PARAMETER      (IDEBAR = 21 100, IDECAP = 21 200)
*                        Tail catcher is part of barrel
      PARAMETER      (IDHBAR = 22 100, IDHCAP = 22 200, IDTAIL = 22 300)
      PARAMETER      (IDVPPC = 23 200, IDVCQF = 24 200)
      PARAMETER      (IDSB   = 25 100, IDSF   = 25 200)
*
* *** MUON
*
      INTEGER        IDMUON, IDMBAR,  IDMCAP, IDMUTY
      INTEGER        IDDTBX, IDRPCB,  IDCSCX, IDRPCF
      PARAMETER     (IDMUON = 30 000, IDMBAR = 30 100, IDMCAP = 30 200)
      PARAMETER                      (IDDTBX = 31 100, IDCSCX = 31 200)
      PARAMETER                      (IDRPCB = 32 100, IDRPCF = 32 200)
      PARAMETER     (IDMUTY = IDMUON/10000)

The four letter convention (xxxx) used above is adopted in CMSIM as a mnemonic for the detector element type identifier IDTYPE = IDxxxx and the above numbers a set via PARAMETER statement in the sequence CMSDID. Of couse it is supposed that any access to those detector element type identifiers will be done only via IDxxxx but not via numbers.

GEANT provides:

• a mechanism (routine GSDETV) of unique identification of the different detector elements of the same type;
• in HITS package this identifier is stored in the hit-bank together with identifier of track which produces this hit and hit itself;
• There is a mechanism (GFPATH/GLVOLU) by using this detector element identifier to obtain the detector element parameters, for example, position of the detector element in the global coordinate system.

These features of GEANT are very heavily used for the tracker and muon system hit handling.