# al-shifted-echo-amplitude-selective-24-cycling-p3.in

# approach: 24-phase cycling the first pulse, the third pulse and the receiver

# spin-5/2 echo and antiecho amplitude optimization
# versus the third-pulse duration
# in three-pulse shifted-echo amplitude-modulated 3Q-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   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)

  acq $par(ph31)
  pulse  $par(p1) $par(rf) $par(ph1)
  pulse  $par(p2) $par(rf) x

  for {set i 1} {$i < $par(np)} {incr i} {
    pulse $par(tsw) $par(rf3) $par(ph3) 
    acq $par(ph31)
  }
}

proc main {} {
  global par

  foreach p {{  0   0  270}\
             { 60   0   90}\
             {120   0  270}\
             {180   0   90}\
             {240   0  270}\
             {300   0   90}\
             {  0  90   90}\
             { 60  90  270}\
             {120  90   90}\
             {180  90  270}\
             {240  90   90}\
             {300  90  270}\
             {  0 180  270}\
             { 60 180   90}\
             {120 180  270}\
             {180 180   90}\
             {240 180  270}\
             {300 180   90}\
             {  0 270   90}\
             { 60 270  270}\
             {120 270   90}\
             {180 270  270}\
             {240 270   90}\
             {300 270  270}} {
    set par(ph1)  [lindex $p 0]
    set par(ph3)  [lindex $p 1]
    set par(ph31) [lindex $p 2]

    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
# -0.00207507874 8.8817842e-16
# -0.00810594218 6.66133815e-16
# -0.0173160631 9.99200722e-16
# -0.0285257284 4.99600361e-16
# -0.0404735825 8.32667268e-16
# -0.052064185 0
# -0.0624837449 4.4408921e-16
# -0.0711900543 5.55111512e-16
# -0.0778273411 1.22124533e-15
# -0.0821294114 6.66133815e-16
# -0.0838585098 4.4408921e-16
# -0.0827974967 8.8817842e-16
# -0.0787859935 1.88737914e-15
# -0.0717775787 1.33226763e-15
# -0.0618956384 1.66533454e-15
# -0.0494733329 1.88737914e-15
# END