Vignesh Sitaraman
b936da724a
modified: ELoss/Eloss.py made changes to generate a ELoss lookup table instead of Range and dE/dx new file: ELoss/alpha_lookup_20MeV.dat new file: ELoss/alpha_lookup_6.0MeV.dat new file: ELoss/proton_lookup_20MeV.dat new file: ELoss/proton_lookup_6.0MeV.dat
62 lines
2.0 KiB
Python
62 lines
2.0 KiB
Python
import pycatima as catima
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import numpy as np
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# --- 1. Constants ---
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P_TORR = 250
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TEMP_K = 293.15
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R = 8.3144
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MEV2U = 1.0 / 931.494
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# Gas Density Calculations
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p_pa = P_TORR * 133.322
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molar_density = p_pa / (R * TEMP_K)
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m_he, m_c, m_o = 4.0026, 12.0000, 15.9949
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m_mix_avg = (0.96 * m_he) + (0.04 * (m_c + 2*m_o))
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rho_g_cm3 = (molar_density * m_mix_avg) / 1e6
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print(f"Gas density at {P_TORR} Torr: {rho_g_cm3:.6e} g/cm^3")
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# --- 2. Material & Step Setup ---
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material_def = [(m_he, 2, 0.96), (m_c, 6, 0.04), (m_o, 8, 0.08)]
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gas_mix = catima.Material(material_def)
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gas_mix.density(rho_g_cm3)
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# Thickness step settings
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step_mg_cm2 = 0.001 # 1 ug/cm2 steps as per your example
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step_g_cm2 = step_mg_cm2 / 1000.0
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max_steps = 100000 # Adjust based on how far you want to track
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def generate_lookup(z, mass_u, e_start_mev, label):
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filename = f"{label}_lookup_{e_start_mev}MeV.dat"
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projectile = catima.Projectile(mass_u, z)
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current_e_total = e_start_mev
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current_thickness_g_cm2 = 0.0
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output = []
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header = f"Energy(MeV) \tmg/cm2 \tcm\nStarting Energy: {e_start_mev} MeV"
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for i in range(max_steps):
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# 1. Record current state
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dist_cm = current_thickness_g_cm2 / rho_g_cm3
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output.append([current_e_total, current_thickness_g_cm2 * 1000.0, dist_cm])
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# 2. Calculate energy loss for the NEXT step
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e_u = current_e_total / mass_u
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if e_u < 0.01: # Stop at ATIMA limit
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break
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projectile.T(e_u)
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# dedx returns MeV / (g/cm2)
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loss_mev = catima.dedx(projectile, gas_mix) * step_g_cm2
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# 3. Update values
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current_e_total -= loss_mev
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current_thickness_g_cm2 += step_g_cm2
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np.savetxt(filename, output, fmt='%.6f', delimiter='\t', header=header)
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print(f"Lookup table created: {filename}")
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# --- 3. Run ---
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# Format: generate_lookup(Z, mass_u, E_start_MeV, label)
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generate_lookup(1, 1.0078, 20, "proton")
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generate_lookup(2, 4.0026, 20, "alpha") |