Hit Finding

• 'Module' name : libscifi(k2ksrc/scifi/libscifi)
• 'Library' name : libscifi
• Output Common block: sfdata.ch(fh/h)

Figure 1: Definition of SciFi hit.

Current definition of scifi hit is given in Fig. 1: A cluster of hit-fibers (Fiber Cluster) is difined as one hit.

Hit finding goes through following analysis stages:

$$\begin{eqnarray*} CCDPixel \rightarrow PixelCluster \rightarrow HitFiber \rightarrow FiberCluster \end{eqnarray*}$$

which are connected by analysis routines:

• IIT Pixel Clustering
• Hit Fiber Finding
• Fiber Clustering

Also each analysis stage has self-looped filtering routines. Analysis flow is given in Fig. 2.

Figure 2: Fit Finding (LibSciFi) analysis flow chart

All SciFi analyses, including tracking, is perfomed by a call of a subroutine in libscifi/sfanal.c:

      call sfanal

In KUIP-interfaced utility (FGDISP/FG$^{++}$) this can be involed by command SFA.

The analysis can be controlled by setting variables in a common libscifi/sfanal.ch:

      common/fgsfaf/fgdosfanl
     &             ,fgiifiltermode,fgcsortmode,fgiicfiltermode
     &             ,fgfhitmode,fgfhfiltermode
     &             ,fgfcmode,fgfcfiltermode
     &             ,fgtrackermode

Explanation of each mode is available in SFSET command description. Those values can be initialized to default varue by:

      call fgsfanlinit