CFT Run Quality Criteria
                            Marj Corcoran
                             23 June 04


  In the CFT group there are actually three subdetectors, the CFT, the
CPS, and the FPS. We supply a separate grade for each subdetector, but
the overall CFT grade for the run is the same as the CFT-subdetector. The
reasoning for this is that, of the three subdetectors, the CFT is the most
crucial, since it is central to the tracking. Anyone interested in the
CPS quality must check the separate key word "cps". As of this date, the FPS
code is not working, so the "fps" flag is currently always UNKNOWN. 

  CFT quality.

  The CFT has 8 axial layers and 8 stereo layers. Each layer receives a
grade of GOOD, REASONABLE, or BAD as follows, based on the rate of hot and dead 
fibers. The definition of hot and dead fibers is described below. If the number
of dead and hot fibers is less than 2%, the layer is GOOD. If the number of dead
or hot fibers is between 2% and 10%, the layer is REASONABLE. If the number of 
dead or hot fibers is greater than 10%, the layer is BAD. 

   The entire detector is GOOD if no more than two layers are rated 
something other than GOOD. If the detector is not GOOD, it is REASONABLE if
no more than two layers are BAD. 

  The  CFT is very seldom rated BAD, and when it is it corresponds 
a hardware failure such as a power supply failure. After the fall 2003 
shutdown, the detector came up with many more dead fibers than before, so
most runs after the fall 2003 shutdown are REASONABLE.  Most runs before the
fall 2003 shutdown are GOOD. 

   CPS quality.
 
    The CPS has two sections (north and south), with each section having
three layers (axial, u, and v). The north and south sections are lumped
together in making run quality decision. Again, each layer is given a grade:
less than 2% dead and less than 5% hot=GOOD, between 2% and 10% dead or between 5%
and 10% hot = REASONABLE, and more than 10% dead or hot=BAD. For the CPS, since all
three layers are used, if any layer is labeled REASONABLE, the entire detector is
REASONABLE, and if any layer is BAD, the entire detector is BAD. 

  FPS quality.

   The FPS part of the code is not working at this time, so until this
problem is fixed, the fps flag will be UNKNOWN for all runs. 

  CFT Run Quality Data Base.

   The CFT data base entry has an overall grade, which is the same as the 
CFT grade. There is a flag (cps) which grades the CPS, and also a flag (fps) 
for the FPS (which is always UNKNOWN at this time). Additional information
loaded into the data base includes the percent hot or dead fibers in each 
layer, and the percent hot or dead discriminator channels. The discriminator 
channels DO NOT enter into the CFT quality grade, since they are more of a 
CTT trigger issue than an CFT/tracking issue. Also note that all the data base
parameters are case sensitive. 

   Determination of Hot and Dead Fibers

    For the CFT, hot and dead fibers are determined by comparison to the average
occupancy of a given layer, for the run being analyzed. The variation about the
mean (ie, the sigmas) have been previously determined from a standard set of
runs. The average occupancy for each layer, and the occupancies for each fiber is
calculated. If a fiber's occupancy is higher than the mean by 7 sigmas, that
fiber is labeled "hot". if the fiber's occupancy is smaller then the mean by 5
sigmas, that fiber is labeled "dead". 

    For the CPS, since there is substantial variation in occupancy within a
layer, the mean occupancy is determined in groups of 64 rather than for a full
layer. The cut off for hot fibers is 1.8 sigma above the mean, and for dead
fibers is 1.5 sigma below the mean.