BARREL CALORIMETERS

Below is a description of a barrel electromagnetic calorimeter, at radius 208 cm, extending to +-239 cm. The energy resolution is given by $\sqrt { 0.26^2 / E^2 + 0.046^2 }$. The resolutions on the shower-axis is 1 degree for the angles, 1.15 cm in R$\phi$ and 0.11 cm in z. The over-all efficiency is 90 %, and the threshold is 0.4 GeV. It is made of lead (A=98), is 20.0 radiation lengths deep, and have a total nuclear interaction length of 0.66. It is sensitive to minimum ionising particles. They give an average signal equivalent to 1 GeV, with a spread of 0.5 GeV. Their threshold is at 5 GeV,and the efficiency is 70 %. This represents a high-granularity calorimeter, with a gaseous active medium.

TYPE: BARREL_CALORIMETRY
      LAYER:HPC
            GEOMETRY:  R=208.0, ZMIN=7.0, ZMAX=230.0,
                         PHI1=8.0, PHI2=22.0, PHI3=23.0
            MATERIAL:    X0=20.0 , A= 98, INTLEN=0.66
            MEASUREMENT: TYPE=1,ROOT_E_COEFF=0.26, CONST_TERM=0.046,
                          EFFI=0.90,THRES=0.4,SIG_TH=1.0,SIG_PHI=1.0,
                          SIG_RPHI=1.15, SIG_Z=0.11
                          MIP_AVE_SIGN=1.0, MIP_SIGN_WIDTH=0.5,
                          MIP_THRES=5.0, MIP_EFF=0.7

Here is a barrel hadronic calorimeter at radius 310 cm, extending to +- 380 cm. The energy resolution is 120%/$\sqrt {E}$ (the constant term is 0), the angular resolution on the shower-axis is 3 degrees in $\theta$; in phi it is 3.75 degrees. The resolution on the shower start-point is 7.22 cm in both R$\phi$ and z. The efficiency is 95 %, and the threshold is 0.4 GeV. It is made of iron (A=26), is 5.45 nuclear interaction lengths deep, and have a total of 52.0 radiation lengths. There is also 5 cm of material in front of the calorimeter. It is also iron, yielding 2.9 radiation lengths, and 0.3 interaction lengths. This represents a course-grain ("Tower") hadronic calorimeter.

TYPE: BARREL_CALORIMETRY
      LAYER: HAB-FMAT
            GEOMETRY:  R=310.0, ZMIN=0.0, ZMAX=380.0
            MATERIAL:    X0=2.9 , A= 26, INTLEN=0.30
            MEASUREMENT: TYPE=0
      LAYER: HAB
            GEOMETRY:  R=315.0, ZMIN=0.0, ZMAX=380.0
            MATERIAL:    X0=52.0 , A= 26, INTLEN=5.45
            MEASUREMENT: TYPE=2,ROOT_E_COEFF=1.20,
                          EFFI=0.95,THRES=0.4,SIG_TH=3.0,SIG_PHI=3.75,
                          SIG_RPHI=7.22 , SIG_Z=7.22

Here is another barrel hadronic calorimeter with the same geometry, energy resolution, material, efficiency and threshold. It also has the same material in front as the example above. It is modular in $\phi$ and z (SHOWER_POS_MEAS=1), with 12 modules in $\phi$ and 10 in z.

This represents a course-grain ("Tower") hadronic calorimeter.

TYPE: BARREL_CALORIMETRY
      LAYER: HAB-FMAT
            GEOMETRY:  R=310.0, ZMIN=0.0, ZMAX=380.0
            MATERIAL:    X0=2.9 , A= 26, INTLEN=0.30
            MEASUREMENT: TYPE=0
      LAYER: HAB
            GEOMETRY:  R=315.0, ZMIN=0.0, ZMAX=380.0
            MATERIAL:    X0=52.0 , A= 26, INTLEN=5.45
            MEASUREMENT: TYPE=2,ROOT_E_COEFF=1.20,
                          EFFI=0.95,THRES=0.4
                          SHOWER_POS_MEAS=1,
                          NCELL1=12, NCELL2=10