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