# al-zfilter-amplitude-24p2p3-filtering-p2b.in

# approach: filtering the desired coherences (-5Q and +1Q) after the first pulse
#           and 4Q after the second pulse

# spin-5/2 echo and antiecho amplitude optimization
# versus the second-pulse duration
# in three-pulse z-filtered amplitude-modulated 3Q-MAS sequence,
# the first-pulse duration p1 = 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   24*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9300
  variable p1      4 
  variable p3      2 
}

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

  matrix set 1 coherence {1 -5}
  matrix set 2 coherence {4}

  pulse  $par(p1) $par(rf) x
  store 10

  reset
  acq -y        
  for {set i 1} {$i < $par(np)} {incr i} {
    reset
    prop 10
    filter 1
    pulse [expr ($i)*$par(tsw)] $par(rf) x 
    filter 2
    pulse $par(p3) $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
# -4.81081131e-07 7.40353435e-10
# -3.08261688e-06 1.14813441e-08
# -5.40825258e-06 4.5896336e-08
# -1.60387451e-06 1.08159272e-07
# 1.01941772e-05 2.02707692e-07
# 2.51075334e-05 3.31284328e-07
# 3.7709392e-05 4.49774946e-07
# 4.87079939e-05 4.42857276e-07
# 6.20759675e-05 1.94281333e-07
# 7.57397447e-05 -2.79678229e-07
# 7.97202783e-05 -7.88694829e-07
# 6.61094861e-05 -1.10279916e-06
# 3.82849283e-05 -1.12776187e-06
# 8.3949398e-06 -9.39723567e-07
# -1.22272696e-05 -6.85790762e-07
# -1.91312035e-05 -4.83468957e-07
# END