# al-zfilter-phase-filtering-p1.in

# approach: filtering the desired coherence (+3Q) after the first pulse
#           and (0Q) after the second pulse

# spin-5/2 echo amplitude optimization
# versus the first-pulse duration
# in three-pulse z-filtered phase-modulated +3Q-MAS sequence,
# the second-pulse duration p2 = 4 micro seconds
# the third-pulse duration p3 = 2 micro seconds

spinsys {
  channels 27Al
  nuclei   27Al
  quadrupole 1 2 3e6 0 0 0 0
}

par {
  spin_rate        5000
  variable tsw     0.25
  sw               1.0e6/tsw
  np               17
  crystal_file     rep100
  gamma_angles     10
  proton_frequency 800e6
  start_operator   48*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     93000
  variable p2      4 
  variable p3      2 
}

proc pulseq {} {
  global par
  maxdt $par(tsw)

  matrix set 1 coherence {3}
  matrix set 2 coherence {0}

  acq -y        
  for {set i 1} {$i < $par(np)} {incr i} {
    pulse $par(tsw) $par(rf) x
    store 2
    filter 1
    pulse $par(p2)  $par(rf) x
    filter 2
    pulse $par(p3) $par(rf3) x
    acq -y
    reset
    prop 2
  }
}

proc main {} {
  global par

  fsave [fsimpson] $par(name).fid
  puts "Larmor frequency (Hz) of 23Na: "
  puts [resfreq 23Na $par(proton_frequency)]
}

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# -8.05614907e-05 1.45107774e-06
# -0.00474863151 2.32487281e-05
# -0.0482166766 5.05920801e-05
# -0.222528853 -0.000225614753
# -0.639752954 -0.00150512609
# -1.33393907 -0.0043261638
# -2.21568641 -0.0083342401
# -3.13357645 -0.0124639561
# -3.97636682 -0.016181532
# -4.72625785 -0.0202975741
# -5.41400359 -0.026056393
# -6.03771823 -0.0335443167
# -6.55648021 -0.0414721766
# -6.94220126 -0.048480908
# -7.19939425 -0.0542447543
# -7.3369502 -0.0592215434
# END