Vignesh Sitaraman
aa960fd711
modified: eloss_calculations/alpha_lookup_50MeV_250torr_3pc.dat modified: eloss_calculations/alpha_lookup_50MeV_250torr_4pc.dat modified: eloss_calculations/alpha_lookup_50MeV_350torr_3pc.dat modified: eloss_calculations/alpha_lookup_50MeV_350torr_4pc.dat modified: eloss_calculations/aluminum_lookup_80MeV_250torr_3pc.dat modified: eloss_calculations/aluminum_lookup_80MeV_250torr_4pc.dat modified: eloss_calculations/aluminum_lookup_80MeV_350torr_3pc.dat modified: eloss_calculations/aluminum_lookup_80MeV_350torr_4pc.dat modified: eloss_calculations/deutron_lookup_30MeV_250torr_3pc.dat modified: eloss_calculations/deutron_lookup_30MeV_250torr_4pc.dat modified: eloss_calculations/deutron_lookup_30MeV_350torr_3pc.dat modified: eloss_calculations/deutron_lookup_30MeV_350torr_4pc.dat modified: eloss_calculations/fluorine_lookup_70MeV_250torr_3pc.dat modified: eloss_calculations/fluorine_lookup_70MeV_250torr_4pc.dat modified: eloss_calculations/fluorine_lookup_70MeV_350torr_3pc.dat modified: eloss_calculations/fluorine_lookup_70MeV_350torr_4pc.dat modified: eloss_calculations/oxygen_lookup_70MeV_250torr_3pc.dat modified: eloss_calculations/oxygen_lookup_70MeV_250torr_4pc.dat modified: eloss_calculations/oxygen_lookup_70MeV_350torr_3pc.dat modified: eloss_calculations/oxygen_lookup_70MeV_350torr_4pc.dat modified: eloss_calculations/proton_lookup_30MeV_250torr_3pc.dat modified: eloss_calculations/proton_lookup_30MeV_250torr_4pc.dat modified: eloss_calculations/proton_lookup_30MeV_350torr_3pc.dat modified: eloss_calculations/proton_lookup_30MeV_350torr_4pc.dat
96 lines
3.6 KiB
Python
96 lines
3.6 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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P_CO2 = 4
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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 = ((1 - P_CO2 / 100) * m_he) + (P_CO2 / 100 * (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, (1 - P_CO2 / 100)), (m_c, 6, P_CO2 / 100), (m_o, 8, 2*P_CO2 / 100)]
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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 -- kept fine for
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# numerical accuracy of the dedx integration itself.
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step_g_cm2 = step_mg_cm2 / 1000.0
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max_steps = 1000000000 # Adjust based on how far you want to track
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coarse_step_cm = 0.2 # row spacing over most of the track
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fine_step_cm = 0.03 # row spacing near the Bragg peak
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fine_zone_frac = 0.085 # fraction of the *total* range treated as "near the peak"
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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_{P_TORR}torr_{P_CO2}pc.dat"
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header = f"Energy(MeV) \tmg/cm2 \tcm\nStarting Energy: {e_start_mev} MeV"
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# Pass 1: integrate at full precision just to find the total range (needed
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# to know where the "last fine_zone_frac" of the track begins).
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projectile = catima.Projectile(mass_u, z)
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e_u = e_start_mev / mass_u
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total_thickness_g_cm2 = 0.0
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while e_u >= 0.0001:
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projectile.T(e_u)
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loss_mev = catima.dedx(projectile, gas_mix) * step_g_cm2
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e_u = (e_u * mass_u - loss_mev) / mass_u
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total_thickness_g_cm2 += step_g_cm2
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total_range_cm = total_thickness_g_cm2 / rho_g_cm3
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fine_zone_start_cm = total_range_cm * (1.0 - fine_zone_frac)
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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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next_checkpoint_cm = 0.0
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output = []
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last_dist_cm = None
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def append_row(e_total, thickness_g_cm2, dist_cm):
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if last_dist_cm is not None and dist_cm <= last_dist_cm:
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return False
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output.append([e_total, thickness_g_cm2 * 1000.0, dist_cm])
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return True
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for i in range(max_steps):
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dist_cm = current_thickness_g_cm2 / rho_g_cm3
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if dist_cm >= next_checkpoint_cm:
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if append_row(current_e_total, current_thickness_g_cm2, dist_cm):
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last_dist_cm = dist_cm
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step_cm = fine_step_cm if dist_cm >= fine_zone_start_cm else coarse_step_cm
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next_checkpoint_cm = dist_cm + step_cm
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e_u = current_e_total / mass_u
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if e_u < 0.0001: # Stop at ATIMA limit
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append_row(current_e_total, current_thickness_g_cm2, dist_cm)
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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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current_e_total = max(0.0, 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} ({len(output)} rows, "
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f"range {total_range_cm:.2f} cm, fine zone below {fine_zone_start_cm:.2f} cm)")
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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, 30, "proton")
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generate_lookup(1, 2.01355, 30, "deutron")
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generate_lookup(2, 4.0026, 50, "alpha")
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generate_lookup(13,26.9815, 80, "aluminum")
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generate_lookup(9,17.0021, 70, "fluorine")
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generate_lookup(8,15.9949, 70, "oxygen") |