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import numpy as np
from chroma.geometry import Solid, Geometry
import chroma.solids as solids
from chroma.optics import vacuum, water, water_wcsim, black_surface
from chroma.transform import rotate, make_rotation_matrix
from itertools import product
import chroma.make as make
def build_lbne(radius, height, nstrings, pmts_per_string, endcap_spacing, detector_material=water_wcsim, physical_model=True):
if physical_model:
pmt = solids.build_12inch_pmt_with_lc(outer_material=detector_material)
else:
pmt = solids.build_12inch_pmt_shell(outer_material=detector_material)
lbne = Geometry(detector_material)
# outer cylinder
cylinder_mesh = make.segmented_cylinder(radius, height+height/(pmts_per_string-1), nsteps=16*nstrings, nsegments=1200)
cylinder_mesh.vertices = rotate(cylinder_mesh.vertices, np.pi/2, (-1,0,0))
lbne.add_solid(Solid(cylinder_mesh, detector_material, vacuum, black_surface, 0xff0000ff))
lbne.pmtids = []
# construct the barrel
for i in range(pmts_per_string):
for j in range(nstrings):
rotation = make_rotation_matrix(j*2*np.pi/nstrings, (0,0,1))
displacement = rotate((0,-radius,-height/2+i*height/(pmts_per_string-1)), j*2*np.pi/nstrings, (0,0,1))
lbne.pmtids.append(lbne.add_solid(pmt, rotation, displacement))
# construct the top endcap
for x, y in np.array(tuple(product(\
np.arange(-radius+0.075, radius, endcap_spacing),
np.arange(-radius+0.075, radius, endcap_spacing)))):
if np.sqrt(x**2 + y**2) < radius - endcap_spacing/2:
rotation = make_rotation_matrix(+np.pi/2, (1,0,0))
displacement = (x,y,+height/2+height/(pmts_per_string-1)/2)
lbne.pmtids.append(lbne.add_solid(pmt, rotation, displacement))
# construct the bottom endcap
for x, y in np.array(tuple(product(\
np.arange(-radius+0.075, radius, endcap_spacing),
np.arange(-radius+0.075, radius, endcap_spacing)))):
if np.sqrt(x**2 + y**2) < radius - endcap_spacing/2:
rotation = make_rotation_matrix(-np.pi/2, (1,0,0))
displacement = (x,y,-height/2-height/(pmts_per_string-1)/2)
lbne.pmtids.append(lbne.add_solid(pmt, rotation, displacement))
return lbne
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