| PDG ESTIMATES OF MATERIAL INTERACTIONS | by Carl Gagliardi | |||||||||
| Temperature (K) = | 300 | Radiation | ||||||||
| Total | Length | Total | ||||||||
| Thickness/unit (mg/cm^2) | Min ionizing/unit (MeV) | Min ionizing contrib (MeV) | X_0 (gm/cm^2) | Thick/X_0 per unit | Thick/X_0 | |||||
| ENTER: | ||||||||||
| Number of mylar foils = | 3 | 0.825 | 1.52E-03 | 4.57E-03 | 39.95 | 2.065E-05 | 6.196E-05 | |||
| cm of DME = | 0.8 | 1.870 | 3.87E-03 | 3.10E-03 | 38.89 | 4.808E-05 | 3.846E-05 | |||
| cm of He N2 = | 5 | 0.192 | 3.68E-04 | 1.84E-03 | 74.63 | 2.571E-06 | 1.285E-05 | |||
| cm of CF4 iso-C4H10 = | 0 | 3.333 | 5.88E-03 | 0.00E+00 | 35.22 | 9.465E-05 | 0.000E+00 | |||
| Mylar target foil (assume 125 um) | 0 | 17.375 | 3.21E-02 | 0.00E+00 | 39.95 | 4.349E-04 | 0.000E+00 | |||
| Graphite on target (assume 45 um, rho=2) | 0 | 9.000 | 1.57E-02 | 0.00E+00 | 42.70 | 2.108E-04 | 0.000E+00 | |||
| Total: | 9.51E-03 | 1.13E-04 | ||||||||
| Assumed typical |cos(th)| = | 0.75 | PDG Estimates: | ||||||||
| theta^rms_plane coef = | 0.1 | Enter |cos(th)| = | 0.950 | |||||||
| (theta^rms_plane)^2 coef = | 0.01 | Energy loss (MeV) = | 1.00E-02 | + | E * | 1.19E-04 | <--valid for e+ or e- only! | |||
| RMS theta in plane = | 9.75E-02 | / | (p*beta) | |||||||
| Enter p*beta = | 30.00 | |||||||||
| He N2 calcs: | ||||||||||
| Energy loss = | 1.36E-02 | MeV | <--valid for e+ or e- only! | |||||||
| He fraction = | 0.97 | RMS theta in plane = | 3.25E-03 | radians | ||||||
| Effective molecular weight = | 4.72 | |||||||||
| Weight fraction He = | 0.822 | 94.32 | ||||||||
| Weight fraction N2 = | 0.178 | 37.99 | ||||||||
| 1 / He N2 X_0 = | 0.01 | |||||||||
| He N2 X_0 = | 74.63 | |||||||||
| CF4 iso-C4H10 calcs: | ||||||||||
| CF4 fraction = | 0.8 | |||||||||
| Effective molecular weight = | 82 | |||||||||
| Weight fraction C in CF4 = | 0.117 | 42.70 | ||||||||
| Weight fraction F in CF4 = | 0.741 | 32.93 | ||||||||
| Weight fraction iso-C4H10 = | 0.141 | 45.07 | ||||||||
| 1 / CF4 iso-C4H10 X_0 = | 0.03 | |||||||||
| CF4 iso-C4H10 X_0 = | 35.22 |