2 UPGR15+FGT as of May 2008

 UPGR15 geometry was modified to match best guess of FGT geometry as of May 2008.

The active FGT area is : Z1=70,..., Z6=120cm, DZ=10 cm, Rin=11.5cm, Rout=37.5 cm 
There is 1cm of additional dead material at Rin & Rout

 

Fig 1. Zvertex=0 cm, green= eta [1.06,2.0]. , red=eta[2.5,4.0]

 

 

Fig 2. Zvertex=+30 cm, green= eta [1.06,2.0]. , red=eta[2.5,4.0]

 

 

Fig 3. Zvertex=-30 cm, green= eta [1.06,2.0]. , red=eta[2.5,4.0]

 

Fig 4. Zoom in on 1 FGT disk.  Detected particle enters from the left, 'active' gas volume has depth of 3mm (between magenta ad blue lines),  FGT strips collect charge on the 1st green line.
 (units in cm)
Zstart = 70.0 ! starting position along Z axis
Z = { 0.0, 10.0, 20.0, 30.0, 40.0, 50.0} ! Z positions for GEM front face
FThk = { 0.05, 0.05, 0.05, 0.05 } ! foil thicknesses inside GEM
SThk = { 0.3, 0.2, 0.2, 0.2 } ! support/spacing thicknesses
SR = 1.0 ! radial size for support

USED material:

 * use aluminized mylar mixture instead of kapton
      Component C5  A=12    Z=6  W=5
      Component H4  A=1     Z=1  W=4
      Component O2  A=16    Z=8  W=2
      Component Al  A=27    Z=13 W=0.2302
      Mixture  ALKAP  Dens=1.432
 
*     G10 is about 60% SiO2 and 40% epoxy
      Component Si  A=28.08  Z=14   W=0.6*1*28./60.
      Component O   A=16     Z=8    W=0.6*2*16./60.
      Component C   A=12     Z=6    W=0.4*8*12./174.
      Component H   A=1      Z=1    W=0.4*14*1./174.
      Component O   A=16     Z=8    W=0.4*4*16./174.
      Mixture   G10    Dens=1.7
 
Block FGDO is the mother volume of the individual GEM disks
      Component Ar A=39.95   Z=18.   W=0.9
      Component C  A=12.01   Z=6.    W=0.1*1*12.01/44.01
      Component O  A=16.     Z=8.    W=0.1*2*16./44.01
      Mixture   Ar_mix  Dens=0.0018015
 
Block FGFO describes the GEM foils
      Material ALKAP
Block FGIS describes the inner support or spacer
      Material G10

Fig 4b FGT disk front view in Geant

 

Fig 5. 1st FGT disk by Jim K. as of April, 2008

 

Fig 6. 3 FGT disks by Jim K. as of April, 2008  

Fig 7 Realistic geometry from Jim K. as of May, 2008

Fig 8 Disk material budget, from Doug, as of May, 2008

Fig 9 APV location , from Doug, as of May, 2008