# na-zfilter-amplitude-p2half-12-cycling-p1.in

# approach: 12-phase cycling the first pulse, the second pulse and the receiver

# spin-3/2 echo and antiecho amplitude optimization
# versus the first-pulse duration
# in three-pulse z-filtered amplitude-modulated 3Q-MAS sequence,
# the second-pulse duration p2 = 4 micro seconds
# the third-pulse duration p3 = 2 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     rep10
  gamma_angles     10
  proton_frequency 800e6
  start_operator   2*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     93000
  variable p2      4 
  variable p3      2 
}

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

  acq $par(ph31)
  for {set i 1} {$i < $par(np)} {incr i} {
    pulse $par(tsw) $par(rf)  $par(ph1) 
    store 2
    pulse $par(p2)  $par(rf)  $par(ph2) 
    pulse $par(p3)  $par(rf3) x
    acq $par(ph31) 
    reset
    prop 2
  }
}

proc main {} {
  global par

  foreach p {{  0   0  270}\
             { 60   0   90}\
             {120   0  270}\
             {180   0   90}\
             {240   0  270}\
             {300   0   90}\
             {  0 180   90}\
             { 60 180  270}\
             {120 180   90}\
             {180 180  270}\
             {240 180   90}\
             {300 180  270}} {
    set par(ph1)  [lindex $p 0]
    set par(ph2)  [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
# 3.05870673e-05 1.11022302e-16
# 0.000872526269 2.22044605e-16
# 0.00549633919 -4.4408921e-16
# 0.0176896872 0
# 0.03721752 -8.8817842e-16
# 0.0551697214 0
# 0.0539785835 8.8817842e-16
# 0.0136477441 0
# -0.0788394354 4.4408921e-16
# -0.22267481 0
# -0.403369389 1.11022302e-16
# -0.599825219 8.8817842e-16
# -0.793846622 6.66133815e-16
# -0.976372012 1.66533454e-16
# -1.14738273 4.16333634e-17
# -1.31087705 0
# END