# al-split-t1-echo-96-phase-cycling-p1.in

# oQ -> 3Q -> 1Q -> -1Q
# approach: 96-phase cycling the first pulse, the third pulse and the receiver

# spin-5/2 echo amplitude optimization
# versus the first-pulse duration
# in three-pulse split-t1 phase-modulated 3Q-MAS sequence,
# the second-pulse duration p2 = 4 micro seconds
# the third-pulse duration p3 = 2 micro seconds

spinsys {
  channels 27Al
  nuclei   27Al
  quadrupole 1 1 3e6 1 0 0 0
}

par {
  spin_rate        5000
  variable tsw     0.5
  sw               1.0e6/tsw
  np               34
  crystal_file     rep100
  gamma_angles     10
  proton_frequency 800e6
  start_operator   I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     90000
  variable p2      4 
  variable p3      2 
  variable N1      12
  variable N3      8
  variable deltap1 -3
  variable deltap3 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)  x
    pulse $par(p3)  $par(rf3) $par(ph3) 
    acq             [expr $par(ph31) - 90]
    reset
    prop 2
  }
}

proc main {} {
  global par

  for {set j1 0} {$j1 < $par(N1)} {incr j1} {
    set par(ph1)   [expr $j1*360./$par(N1)]
    for {set j3 0} {$j3 < $par(N3)} {incr j3} {
      set par(ph3)   [expr $j3*360./$par(N3)]
      set par(ph31)  [expr $par(deltap1)*$par(ph1) + $par(deltap3)*$par(ph3) ]

      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
# -0.0341353219 6.66133815e-16
# -0.623744102 1.44328993e-15
# -2.78363129 -2.33146835e-15
# -5.33018905 -2.77555756e-16
# -5.95004287 -1.99840144e-15
# -5.5143845 -3.10862447e-15
# -5.74375572 -1.11022302e-16
# -7.02360225 -6.7168493e-15
# -8.99499755 -6.63358257e-15
# -11.169211 -3.91150328e-15
# -11.977791 -2.88657986e-15
# -11.5447503 -4.05231404e-15
# -11.4510079 -9.18709553e-15
# -11.6882855 -5.44703171e-15
# -12.2563181 -5.71417913e-15
# -12.7166552 -7.27196081e-15
# -12.8342944 -5.27355937e-15
# -12.8356104 -6.38378239e-16
# -12.7934287 -1.66533454e-15
# -12.7930292 -2.22044605e-16
# -11.9634523 -3.44169138e-15
# -10.6220506 -3.33760797e-15
# -9.44803861 -3.13638004e-15
# -8.53279158 -1.83186799e-15
# -8.05517626 -1.11022302e-16
# -7.88079997 1.35308431e-15
# -7.56359583 1.60461922e-15
# -6.67314636 -7.07767178e-16
# -5.3197667 1.94289029e-16
# -3.9620822 2.22044605e-16
# -2.86453618 0
# -2.16280818 -2.0539126e-15
# -1.84411501 -1.05471187e-15
# END