# al-spam-antiecho-5Q-selective-filtering-p3.in

# approach: filtering the desired coherences (5Q) after the first pulse
#           and (±5Q, ±4Q, ±3Q, ±2Q, ±1Q, and 0Q) after the second pulse

# spin-5/2 antiecho amplitude optimization
# versus the third-pulse duration
# in three-pulse spam 5Q-MAS sequence,
# the first-pulse duration p1 = 4 micro seconds
# the second-pulse duration p2 = 4 micro seconds

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

par {
  spin_rate        5000
  variable tsw     0.25
  sw               1.0e6/tsw
  np               17
  crystal_file     rep10
  gamma_angles     10
  proton_frequency 800e6
  start_operator   20*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9300
  variable p1      4 
  variable p2      4 
}

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

  matrix set 1 coherence {5}
  matrix set 2 coherence {9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9}

  acq -y        
  pulse  $par(p1) $par(rf) x
  filter 1
  pulse  $par(p2) $par(rf) x
  filter 2

  for {set i 1} {$i < $par(np)} {incr i} {
    pulse $par(tsw) $par(rf3) x 
    acq -y
  }
}

proc main {} {
  global par

  fsave [fsimpson] $par(name).fid
  puts "Larmor frequency (Hz) of 27Al: "
  puts [resfreq 27Al $par(proton_frequency)]
}

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# -1.00044439 -5.76411345e-016
# -0.999820562 -5.56855677e-016
# -0.994037074 -5.3320539e-016
# -0.983017157 -4.84475586e-016
# -0.966769021 -4.80692973e-016
# -0.9454271 -4.9087917e-016
# -0.919289962 -4.54361539e-016
# -0.888842762 -4.1512875e-016
# -0.854756302 -3.91724402e-016
# -0.817861276 -3.69902842e-016
# -0.779102784 -3.43995077e-016
# -0.739484525 -3.28321686e-016
# -0.700013156 -3.09110939e-016
# -0.661651101 -3.18672493e-016
# -0.625281808 -2.93802465e-016
# -0.591687006 -2.75356675e-016
# END