# al-shifted-echo-amplitude-selective-40-cycling-p2.in
# approach: 40-phase cycling the first and the third pulses and the receiver

# spin-5/2 echo and antiecho amplitude optimization
# versus the second-pulse duration
# in three-pulse shifted-echo amplitude-modulated 5Q-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     rep10
  gamma_angles     10
  proton_frequency 800e6
  start_operator   I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9300
  variable p1      4
  variable p3      2
  variable NA      10
  variable NC      4
  variable deltapA -5
  variable deltapC 2
}

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

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

  reset
  acq $par(phREC)       
  for {set i 1} {$i < $par(np)} {incr i} {
    reset
    prop 10
    pulse [expr ($i)*$par(tsw)] $par(rf)  $par(phB)
    pulse $par(p3)              $par(rf3) $par(phC)
    acq                     [expr $par(phREC) - 90]

  }
}

proc main {} {
  global par

  set par(phB)   0

  for {set jC 0} {$jC < $par(NC)} {incr jC} {
    set par(phC)   [expr $jC*360./$par(NC)]

    for {set jA 0} {$jA < $par(NA)} {incr jA} {
      set par(phA)   [expr $jA*360./$par(NA)]
      set par(phREC) [expr $par(deltapA)*$par(phA) + $par(deltapC)*$par(phC)]

      set g [fsimpson]
      if [info exists f] {
        fadd $f $g
        funload $g
      } else {
        set f $g
      }
    }
  }

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

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# 0.00817663886 -3.69641001e-05
# 0.0264804715 -8.795937e-05
# 0.0448885196 -6.88469842e-05
# 0.0577925279 5.5891564e-05
# 0.0657168207 0.000256355575
# 0.071915418 0.000473634585
# 0.0780538081 0.000672361822
# 0.0826211135 0.000859818168
# 0.0824252025 0.00105956505
# 0.075090186 0.00127437281
# 0.0605690073 0.00148471052
# 0.041271781 0.00168439332
# 0.0214733244 0.0019018538
# 0.00631947716 0.00216947237
# 0.000120874833 0.00246950901
# 0.0041292242 0.00271822963
# END