Parsing ImpactT.in¶

Here are some examples of the low level routines to parse the main input file.

Note that the Impact class does this automatically

In [1]:

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from impact.parsers import (
    parse_header,
    ix_lattice,
    parse_type,
    ele_type,
    parse_quadrupole,
    parse_solrf,
    parse_wakefield,
    parse_lattice,
)
from impact.parsers import (
    parse_header,
    ix_lattice,
    parse_type,
    ele_type,
    parse_quadrupole,
    parse_solrf,
    parse_wakefield,
    parse_lattice,
)

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from impact.lattice import ele_str, ele_line
from impact.lattice import ele_str, ele_line

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with open("templates/lcls_injector/ImpactT.in", "r") as f:
    data = f.read()
    LINES = data.split("\n")
with open("templates/lcls_injector/ImpactT.in", "r") as f:
    data = f.read()
    LINES = data.split("\n")

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parse_header(LINES)
parse_header(LINES)

Out[4]:

{'Npcol': 2,
 'Nprow': 2,
 'Dt': 5e-13,
 'Ntstep': 1000000,
 'Nbunch': 1,
 'Dim': 6,
 'Np': 10000,
 'Flagmap': 1,
 'Flagerr': 0,
 'Flagdiag': 2,
 'Flagimg': 1,
 'Zimage': 0.02,
 'Nx': 32,
 'Ny': 32,
 'Nz': 32,
 'Flagbc': 1,
 'Xrad': 0.015,
 'Yrad': 0.015,
 'Perdlen': 45.0,
 'Flagdist': 16,
 'Rstartflg': 0,
 'Flagsbstp': 0,
 'Nemission': 400,
 'Temission': 6.515803466731775e-12,
 'sigx(m)': 0.0006,
 'sigpx': 0.0,
 'muxpx': 0.0,
 'xscale': 1.0,
 'pxscale': 1.0,
 'xmu1(m)': 0.0,
 'xmu2': 0.0,
 'sigy(m)': 0.0006,
 'sigpy': 0.0,
 'muxpy': 0.0,
 'yscale': 1.0,
 'pyscale': 1.0,
 'ymu1(m)': 0.0,
 'ymu2': 0.0,
 'sigz(m)': 1.27e-06,
 'sigpz': 0.0,
 'muxpz': 0.0,
 'zscale': 1.0,
 'pzscale': 1.0,
 'zmu1(m)': 0.0,
 'zmu2': 0.0,
 'Bcurr': 0.7140000000000003,
 'Bkenergy': 1.0,
 'Bmass': 511005.0,
 'Bcharge': -1.0,
 'Bfreq': 2856000000.0,
 'Tini': -3.249141278122655e-12}

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# Find index of the line where the lattice starts
IX_LATTICE = ix_lattice(LINES)

# Gather lattice lines
LATLINES = LINES[IX_LATTICE:]
# Find index of the line where the lattice starts
IX_LATTICE = ix_lattice(LINES)

# Gather lattice lines
LATLINES = LINES[IX_LATTICE:]

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# Summary of elements in this lattice
def myf(t):
    return [l for l in LATLINES if parse_type(l) == t]


quads = myf("quadrupole")
# drifts = myf('drift')
solrfs = myf("solrf")
wakefields = myf("wakefield")

alltypes = set([parse_type(l) for l in LATLINES])
print(alltypes)

for t in ele_type.values():
    l = len(myf(t))
    if l > 0:
        print(l, t)
# Summary of elements in this lattice
def myf(t):
    return [l for l in LATLINES if parse_type(l) == t]


quads = myf("quadrupole")
# drifts = myf('drift')
solrfs = myf("solrf")
wakefields = myf("wakefield")

alltypes = set([parse_type(l) for l in LATLINES])
print(alltypes)

for t in ele_type.values():
    l = len(myf(t))
    if l > 0:
        print(l, t)

{'quadrupole', 'stop', 'write_beam', 'change_timestep', 'solrf', 'spacecharge', 'comment', 'wakefield', 'rotationally_symmetric_to_3d'}
8 quadrupole
10 solrf
4 write_beam
1 change_timestep
1 rotationally_symmetric_to_3d
2 wakefield
1 spacecharge
1 stop

Individual element parsing¶

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parse_quadrupole(quads[0])
parse_quadrupole(quads[0])

Out[7]:

{'zedge': 0.01601,
 'b1_gradient': 0.0,
 'L_effective': 0.21,
 'radius': 0.0254,
 'x_offset': 0.0,
 'y_offset': 0.0,
 'x_rotation': 0.0,
 'y_rotation': 0.0,
 'z_rotation': 0.7853981633974483}

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parse_solrf(solrfs[0])
parse_solrf(solrfs[0])

Out[8]:

{'zedge': 0.0,
 'rf_field_scale': 47537665.059089914,
 'rf_frequency': 2856000000.0,
 'theta0_deg': 303.93723122804266,
 'filename': 'rfdata201',
 'radius': 0.15,
 'x_offset': 0.0,
 'y_offset': 0.0,
 'x_rotation': 0.0,
 'y_rotation': 0.0,
 'z_rotation': 0.0,
 'solenoid_field_scale': 0.0}

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parse_wakefield(wakefields[0])
parse_wakefield(wakefields[0])

Out[9]:

{'s_begin': 1.485,
 's': 4.527856,
 'method': 'analytical',
 'iris_radius': 0.0116,
 'gap': 0.0292,
 'period': 0.035}

Full lattice parsing into element dicts¶

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# This parses all lines.
eles = parse_lattice(LATLINES)
# This parses all lines.
eles = parse_lattice(LATLINES)

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# MAD-style printing
for e in eles:
    s = ele_str(e)
    print(s)
# MAD-style printing
for e in eles:
    s = ele_str(e)
    print(s)

change_timestep_1: change_timestep, description=name:change_timestep_1, dt=4e-12,
      s=0.25
SC_2D_to_3D: rotationally_symmetric_to_3d, description=name:SC_2D_to_3D, s=-1000.0

!__________________ 1.5 cell gun __________________
! Single particle phased and scaled for 6 MeV energy
GUN: solrf, description=name:GUN, L=0.15, zedge=0.0, rf_field_scale=47537665.059089914,
      rf_frequency=2856000000.0, theta0_deg=303.93723122804266, filename=rfdata201,
      radius=0.15, x_offset=0.0, y_offset=0.0, x_rotation=0.0, y_rotation=0.0,
      z_rotation=0.0, solenoid_field_scale=0.0, s=0.15

!__________________Solenoid and correctors__________________
SOL1: solrf, description=name:SOL1, L=0.49308, zedge=0.0, rf_field_scale=0.0,
      rf_frequency=0.0, theta0_deg=0.0, filename=rfdata102, radius=0.15, x_offset=0.0,
      y_offset=0.0, x_rotation=0.0, y_rotation=0.0, z_rotation=0.0,
      solenoid_field_scale=0.2457, s=0.49308
! Corrector quads: skew and regular.
! Overlap SOL1. Effective length, radius estimated from measurements.
! Max field should be 0.00714 T/m
SQ01: quadrupole, description=name:SQ01, L=0.36, zedge=0.01601, b1_gradient=0.0,
      L_effective=0.21, radius=0.0254, x_offset=0.0, y_offset=0.0, x_rotation=0.0,
      y_rotation=0.0, z_rotation=0.7853981633974483, s=0.37601
CQ01: quadrupole, description=name:CQ01, L=0.36, zedge=0.01601, b1_gradient=0.0,
      L_effective=0.21, radius=0.0254, x_offset=0.0, y_offset=0.0, x_rotation=0.0,
      y_rotation=0.0, z_rotation=0.0, s=0.37601
!________________________________________________________________________

!!! Broken: 0 1 101 -2 0.0 0.0 0.61362 /!name:YAG01
YAG02: write_beam, description=name:YAG02, filename=fort.102, sample_frequency=1,
      s=1.38841

!__________________ L0A begin __________________
wakefield_L0A: wakefield, description=name:wakefield_L0A, s_begin=1.485, s=4.527856,
      method=analytical, iris_radius=0.0116, gap=0.0292, period=0.035
! Phased to get to 64 MeV
L0A_entrance: solrf, description=name:L0A_entrance, L=0.052464, zedge=1.485,
      rf_field_scale=26013439.060000002, rf_frequency=2856000000.0,
      theta0_deg=264.5, filename=rfdata4, radius=0.15, x_offset=0.0, y_offset=0.0,
      x_rotation=0.0, y_rotation=0.0, z_rotation=0.0, solenoid_field_scale=0.0,
      s=1.5374640000000002
L0A_body_1: solrf, description=name:L0A_body_1, L=2.937928, zedge=1.537464,
      rf_field_scale=30048347.1, rf_frequency=2856000000.0, theta0_deg=294.5,
      filename=rfdata5, radius=0.15, x_offset=0.0, y_offset=0.0, x_rotation=0.0,
      y_rotation=0.0, z_rotation=0.0, solenoid_field_scale=0.0, s=4.475391999999999
L0A_body_2: solrf, description=name:L0A_body_2, L=2.937928, zedge=1.537464,
      rf_field_scale=30048347.1, rf_frequency=2856000000.0, theta0_deg=354.5,
      filename=rfdata6, radius=0.15, x_offset=0.0, y_offset=0.0, x_rotation=0.0,
      y_rotation=0.0, z_rotation=0.0, solenoid_field_scale=0.0, s=4.475391999999999
L0A_exit: solrf, description=name:L0A_exit, L=0.052464, zedge=4.475392,
      rf_field_scale=26013439.060000002, rf_frequency=2856000000.0,
      theta0_deg=264.5, filename=rfdata7, radius=0.15, x_offset=0.0, y_offset=0.0,
      x_rotation=0.0, y_rotation=0.0, z_rotation=0.0, solenoid_field_scale=0.0,
      s=4.527856
!__________________ L0A exit __________________
! Space charge switches
!!!0 0 0 -8 0 1 4.527856 / name:SC_ON
!!!0 0 0 -8 0 -1 4.527856 / name:SC_OFF
!!!0 0 0 -5 0.0 0.0 4.527856 /!name:SC_2D_to_3D

YAG03: write_beam, description=name:YAG03, filename=fort.103, sample_frequency=1,
      s=4.614538605
QA01: quadrupole, description=name:QA01, L=0.204, zedge=4.752933605,
      b1_gradient=1.8524000101358, L_effective=0.108, radius=0.016, x_offset=0.0,
      y_offset=0.0, x_rotation=0.0, y_rotation=0.0, z_rotation=0.0, s=4.956933605
QA02: quadrupole, description=name:QA02, L=0.204, zedge=5.081309605,
      b1_gradient=-1.8524000101358, L_effective=0.108, radius=0.016, x_offset=0.0,
      y_offset=0.0, x_rotation=0.0, y_rotation=0.0, z_rotation=0.0, s=5.285309605

!__________________ L0B begin __________________
wakefield_L0B: wakefield, description=name:wakefield_L0B, s_begin=5.328756, s=8.371612,
      method=analytical, iris_radius=0.0116, gap=0.0292, period=0.035
! Phased to get to 135 MeV
L0B_entrance: solrf, description=name:L0B_entrance, L=0.052464, zedge=5.328756,
      rf_field_scale=31395529.900000002, rf_frequency=2856000000.0,
      theta0_deg=42.27, filename=rfdata4, radius=0.15, x_offset=0.0, y_offset=0.0,
      x_rotation=0.0, y_rotation=0.0, z_rotation=0.0, solenoid_field_scale=0.0,
      s=5.38122
L0B_body_1: solrf, description=name:L0B_body_1, L=2.937928, zedge=5.38122,
      rf_field_scale=36265246.5, rf_frequency=2856000000.0, theta0_deg=72.27,
      filename=rfdata5, radius=0.15, x_offset=0.0, y_offset=0.0, x_rotation=0.0,
      y_rotation=0.0, z_rotation=0.0, solenoid_field_scale=0.0, s=8.319148
L0B_body_2: solrf, description=name:L0B_body_2, L=2.937928, zedge=5.38122,
      rf_field_scale=36265246.5, rf_frequency=2856000000.0, theta0_deg=132.27,
      filename=rfdata6, radius=0.15, x_offset=0.0, y_offset=0.0, x_rotation=0.0,
      y_rotation=0.0, z_rotation=0.0, solenoid_field_scale=0.0, s=8.319148
L0B_exit: solrf, description=name:L0B_exit, L=0.052464, zedge=8.319148,
      rf_field_scale=31395529.900000002, rf_frequency=2856000000.0,
      theta0_deg=42.27, filename=rfdata7, radius=0.15, x_offset=0.0, y_offset=0.0,
      x_rotation=0.0, y_rotation=0.0, z_rotation=0.0, solenoid_field_scale=0.0,
      s=8.371612
!__________________ L0B exit __________________

QE01: quadrupole, description=name:QE01, L=0.204, zedge=8.392048605,
      b1_gradient=0.18720000156206, L_effective=0.108, radius=0.016, x_offset=0.0,
      y_offset=0.0, x_rotation=0.0, y_rotation=0.0, z_rotation=0.0, s=8.596048605
QE02: quadrupole, description=name:QE02, L=0.204, zedge=8.793561605,
      b1_gradient=0.16609999999321, L_effective=0.108, radius=0.016, x_offset=0.0,
      y_offset=0.0, x_rotation=0.0, y_rotation=0.0, z_rotation=0.0,
      s=8.997561605000001

!!! Unmodeled: Laser Heater from 9.076892 m to 10.690580 m

QE03: quadrupole, description=name:QE03, L=0.204, zedge=11.469244190867,
      b1_gradient=-2.6409000012747, L_effective=0.108, radius=0.016, x_offset=0.0,
      y_offset=0.0, x_rotation=0.0, y_rotation=0.0, z_rotation=0.0, s=11.673244190867
QE04: quadrupole, description=name:QE04, L=0.204, zedge=11.875644190867,
      b1_gradient=2.9799999853198, L_effective=0.108, radius=0.016, x_offset=0.0,
      y_offset=0.0, x_rotation=0.0, y_rotation=0.0, z_rotation=0.0, s=12.079644190867

!!! 0 1 104 -2 0.0 0.0 12.175332190867 /!name:WS01
OTR1: write_beam, description=name:OTR1, filename=fort.105, sample_frequency=1,
      s=12.327300190867
!!! 0 1 106 -2 0.0 0.0 14.089061190867 /!name:WS02
OTR2: write_beam, description=name:OTR2, filename=fort.107, sample_frequency=1,
      s=14.241029190867
!!! 0 1 108 -2 0.0 0.0 16.002790190867 /!name:WS03
!!! 0 1 109 -2 0.0 0.0 16.154758190867 /!name:OTR3

SC_OFF: spacecharge, description=name:SC_OFF, s=16.5, is_on=False

stop_1: stop, description=name:stop_1, s=3.0

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# Output lines
for e in eles:
    print(ele_line(e))
# Output lines
for e in eles:
    print(ele_line(e))

0 0 0 -4 0.0 0.0 0.25 4e-12 /!name:change_timestep_1
0 0 0 -5 0.0 0.0 -1000.0 /!name:SC_2D_to_3D

!__________________ 1.5 cell gun __________________
! Single particle phased and scaled for 6 MeV energy
0.15 0 0 105 0.0 47537665.059089914 2856000000.0 303.93723122804266 201 0.15 0.0 0.0 0.0 0.0 0.0 0.0 /!name:GUN

!__________________Solenoid and correctors__________________
0.49308 0 0 105 0.0 0.0 0.0 0.0 102 0.15 0.0 0.0 0.0 0.0 0.0 0.2457 /!name:SOL1
! Corrector quads: skew and regular.
! Overlap SOL1. Effective length, radius estimated from measurements.
! Max field should be 0.00714 T/m
0.36 0 0 1 0.01601 0.0 0.21 0.0254 0.0 0.0 0.0 0.0 0.7853981633974483 /!name:SQ01
0.36 0 0 1 0.01601 0.0 0.21 0.0254 0.0 0.0 0.0 0.0 0.0 /!name:CQ01
!________________________________________________________________________

!!! Broken: 0 1 101 -2 0.0 0.0 0.61362 /!name:YAG01
0 1 102 -2 0.0 0.0 1.38841 /!name:YAG02

!__________________ L0A begin __________________
0 -1 0 -6 1 1 1.485 4.527856 0.0116 0.0292 0.035 /!name:wakefield_L0A
! Phased to get to 64 MeV
0.052464 0 0 105 1.485 26013439.060000002 2856000000.0 264.5 4 0.15 0.0 0.0 0.0 0.0 0.0 0.0 /!name:L0A_entrance
2.937928 0 0 105 1.537464 30048347.1 2856000000.0 294.5 5 0.15 0.0 0.0 0.0 0.0 0.0 0.0 /!name:L0A_body_1
2.937928 0 0 105 1.537464 30048347.1 2856000000.0 354.5 6 0.15 0.0 0.0 0.0 0.0 0.0 0.0 /!name:L0A_body_2
0.052464 0 0 105 4.475392 26013439.060000002 2856000000.0 264.5 7 0.15 0.0 0.0 0.0 0.0 0.0 0.0 /!name:L0A_exit
!__________________ L0A exit __________________
! Space charge switches
!!!0 0 0 -8 0 1 4.527856 / name:SC_ON
!!!0 0 0 -8 0 -1 4.527856 / name:SC_OFF
!!!0 0 0 -5 0.0 0.0 4.527856 /!name:SC_2D_to_3D

0 1 103 -2 0.0 0.0 4.614538605 /!name:YAG03
0.204 0 0 1 4.752933605 1.8524000101358 0.108 0.016 0.0 0.0 0.0 0.0 0.0 /!name:QA01
0.204 0 0 1 5.081309605 -1.8524000101358 0.108 0.016 0.0 0.0 0.0 0.0 0.0 /!name:QA02

!__________________ L0B begin __________________
0 -1 0 -6 1 1 5.328756 8.371612 0.0116 0.0292 0.035 /!name:wakefield_L0B
! Phased to get to 135 MeV
0.052464 0 0 105 5.328756 31395529.900000002 2856000000.0 42.27 4 0.15 0.0 0.0 0.0 0.0 0.0 0.0 /!name:L0B_entrance
2.937928 0 0 105 5.38122 36265246.5 2856000000.0 72.27 5 0.15 0.0 0.0 0.0 0.0 0.0 0.0 /!name:L0B_body_1
2.937928 0 0 105 5.38122 36265246.5 2856000000.0 132.27 6 0.15 0.0 0.0 0.0 0.0 0.0 0.0 /!name:L0B_body_2
0.052464 0 0 105 8.319148 31395529.900000002 2856000000.0 42.27 7 0.15 0.0 0.0 0.0 0.0 0.0 0.0 /!name:L0B_exit
!__________________ L0B exit __________________

0.204 0 0 1 8.392048605 0.18720000156206 0.108 0.016 0.0 0.0 0.0 0.0 0.0 /!name:QE01
0.204 0 0 1 8.793561605 0.16609999999321 0.108 0.016 0.0 0.0 0.0 0.0 0.0 /!name:QE02

!!! Unmodeled: Laser Heater from 9.076892 m to 10.690580 m

0.204 0 0 1 11.469244190867 -2.6409000012747 0.108 0.016 0.0 0.0 0.0 0.0 0.0 /!name:QE03
0.204 0 0 1 11.875644190867 2.9799999853198 0.108 0.016 0.0 0.0 0.0 0.0 0.0 /!name:QE04

!!! 0 1 104 -2 0.0 0.0 12.175332190867 /!name:WS01
0 1 105 -2 0.0 0.0 12.327300190867 /!name:OTR1
!!! 0 1 106 -2 0.0 0.0 14.089061190867 /!name:WS02
0 1 107 -2 0.0 0.0 14.241029190867 /!name:OTR2
!!! 0 1 108 -2 0.0 0.0 16.002790190867 /!name:WS03
!!! 0 1 109 -2 0.0 0.0 16.154758190867 /!name:OTR3

0 0 0 -8 0.0 -1 16.5 /!name:SC_OFF

0 0 0 -99 3.0 0.0 3.0 /!name:stop_1