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

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

# spin-3/2 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 23Na
  nuclei   23Na
  quadrupole 1 1 1e6 1 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   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 23Na: "
  puts [resfreq 23Na $par(proton_frequency)]
}

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# 0.00126024661 5.55111512e-17
# 0.00483799183 1.04083409e-16
# 0.0100619674 2.70616862e-16
# 0.0159680152 9.71445147e-17
# 0.0215904077 2.22044605e-16
# 0.0262180886 2.08166817e-16
# 0.02953336 1.11022302e-16
# 0.0316025874 2.08166817e-16
# 0.0327472183 4.02455846e-16
# 0.0333641057 2.77555756e-16
# 0.0337719109 3.05311332e-16
# 0.0341358289 4.99600361e-16
# 0.0344804726 3.05311332e-16
# 0.0347610706 3.33066907e-16
# 0.0349432008 5.82867088e-16
# 0.0350473229 3.88578059e-16
# END