TYPE: BARREL_TRACKING LAYER: VD-CLOSER GEOMETRY: R=6.3, ZMIN=0.0 , ZMAX=10.65 MATERIAL: X0=.005,A=14 MEASUREMENT: CODE=1, SIG_RPHI=0.001, SIG_Z=0.0
The next example is the same detector, with its support structure and read-out electronics added. This structure is a ring at each end from 10.65 to 14.65 cm (and -10.65 to -14.65 cm), with a thickness of 10% of a radiation length. It does not measure anything. Both these two elements have the name VD-CLOSER :
TYPE: BARREL_TRACKING LAYER: VD-CLOSER GEOMETRY: R=6.21, ZMIN=10.65, ZMAX=14.65 MATERIAL: X0=.100, A= 14 MEASUREMENT: CODE=0 LAYER: GEOMETRY: R=6.3, ZMIN=0.0 , ZMAX=10.65 MATERIAL: X0=.005,A=14 MEASUREMENT: CODE=1, SIG_RPHI=0.001
This is once again the same detector, but now also measuring z, with a perpendicular precision of 10 micron. The angular exponent is 2.6 :
TYPE: BARREL_TRACKING LAYER: VD-CLOSER GEOMETRY: R=6.21, ZMIN=10.65, ZMAX=14.65 MATERIAL: X0=.100, A= 14 MEASUREMENT: CODE=0 LAYER: GEOMETRY: R=6.3, ZMIN=0.0 , ZMAX=10.65 MATERIAL: X0=.005, A= 14 MEASUREMENT: CODE=1, SIG_RPHI=0.001, SIG_Z=0.001, ANG_EXP=2.6
Here below is the same micro-vertex detector, but with some detail added. Instead of being a single continuous cylinder, it is two closely separated cylinders of plaquettes. The closer of the two measures R and z between 28 and 45 degrees, nothing between 45 and 58 degrees. The next layer is complementary : it measures between 13 and 30 degrees, nothing between 30 and 43. This pattern is repeated for each 30 degree sector of the full turn. In both layers, the non-measuring sector is empty. (Note that there is in fact a measuring sector that starts at -2 degrees and extends to 15 degrees. This is not entered as the first measuring sector, because it starts at 358 degrees, since angles should be measured in positive direction.) Hence, this describes a layer of a silicon microvertex detector made out of two cylinders of slightly over-lapping plaquettes: two 2 degrees over-lapping portions per 30 degrees.
TYPE: BARREL_TRACKING LAYER: VD-CLOSER GEOMETRY: R=6.21, ZMIN=10.65, ZMAX=14.65 MATERIAL: X0=.100, A= 14 MEASUREMENT: CODE=0 LAYER: GEOMETRY: R=6.3, ZMIN=0.0 , ZMAX=10.65 MATERIAL: X0=.005, A= 14 MEASUREMENT: CODE=1, SIG_RPHI=0.001, SIG_Z=0.001, ANG_EXP=2.6,PHI1=28., PHI2=45., PHI3=58., EMPTY_TYPE=0 LAYER: GEOMETRY: R=6.3, ZMIN=0.0 , ZMAX=10.65 MATERIAL: X0=.005, A= 14 MEASUREMENT: CODE=1, SIG_RPHI=0.001, SIG_Z=0.001, ANG_EXP=2.6,PHI1=13., PHI2=30., PHI3=43., EMPTY_TYPE=0
This is a detector measuring angles and position, R with a precision of 60 micron and phi with a precision of 2 mRad :
TYPE: BARREL_TRACKING LAYER : ID-JET GEOMETRY: R=17.0 , ZMIN=0.0, ZMAX=40.0 MEASUREMENT: CODE=2, SIG_RPHI=0.006, SIG_PHI=0.002
This is a detector measuring R,z and :
TYPE: BARREL_TRACKING LAYER : ID-TRIGGER GEOMETRY: R=27.0 , ZMIN=0.0, ZMAX=60.0 MEASUREMENT: CODE=2, SIG_RPHI=0.100, SIG_Z=0.1, SIG_PHI=0.007
This is a possible description of a TPC, with 3 pad rows in radius, separated by 4.6 cm, and an inner wall of thickness 0.025 X :
TYPE: BARREL_TRACKING LAYER : TPC-IWALL GEOMETRY: R=30.75 , ZMIN=0.0, ZMAX=134.0 MATERIAL: X0=0.025, A= 13 MEASUREMENT: CODE=0 LAYER : TPC GEOMETRY: R=39.8, ZMIN=0.0 , ZMAX=134. MATERIAL: X0=.0 MEASUREMENT: CODE=1, SIG_RPHI=0.030, SIG_Z=0.1 LAYER : GEOMETRY: R=44.5, ZMIN=0.0 , ZMAX=134. MATERIAL: X0=.0 MEASUREMENT: CODE=1, SIG_RPHI=0.030, SIG_Z=0.1 LAYER : GEOMETRY: R=49.1, ZMIN=0.0 , ZMAX=134. MATERIAL: X0=.0 MEASUREMENT: CODE=1, SIG_RPHI=0.030, SIG_Z=0.1
A more compact way to describe the same dettector, using the REPEAT construct, would be
TYPE: BARREL_TRACKING LAYER : TPC-IWALL GEOMETRY: R=30.75 , ZMIN=0.0, ZMAX=134.0 MATERIAL: X0=0.025, A= 13 MEASUREMENT: CODE=0 LAYER : TPC REPEAT : TIMES=3 , DELTA_R = 5.0 GEOMETRY: R=39.8, ZMIN=0.0 , ZMAX=134. MATERIAL: X0=.0 MEASUREMENT: CODE=1, SIG_RPHI=0.030, SIG_Z=0.1 ENDREPEAT: