# al-split-t1-echo-selective-48-phase-cycling-p2.in

# oQ -> 3Q -> (5Q, 1Q, -3Q) -> -1Q
# approach: 48-phase cycling the first pulse, the third pulse and the receiver

# spin-5/2 echo amplitude optimization
# versus the second-pulse duration
# in three-pulse split-t1 phase-modulated 3Q-MAS sequence,
# the first-pulse duration p1 = 9 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     0.25
  sw               1.0e6/tsw
  np               34
  crystal_file     rep10
  gamma_angles     10
  proton_frequency 800e6
  start_operator   I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9000
  variable p1      9 
  variable p3      2 
  variable N1      12
  variable N3      4
  variable deltap1 -3
  variable deltap3 2
}

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

  pulse  $par(p1) $par(rf) $par(ph1)
  store 10

  reset
  acq $par(ph31)
  for {set i 1} {$i < $par(np)} {incr i} {
    reset
    prop 10
    pulse [expr ($i)*$par(tsw)] $par(rf)  x
    pulse $par(p3)              $par(rf3) $par(ph3)
    acq             [expr $par(ph31) - 90]
  }
}

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
# -0.000162918058 -2.22044605e-16
# 0.0139680169 6.0368377e-16
# 0.0425775726 -1.11022302e-16
# 0.066458608 2.22044605e-16
# 0.0640241671 1.38777878e-16
# 0.0137324788 -1.94289029e-16
# -0.0795781115 4.57966998e-16
# -0.170854483 2.35922393e-16
# -0.195699108 0
# -0.116984632 3.46944695e-17
# 0.035702454 -1.38777878e-16
# 0.184907295 1.66533454e-16
# 0.253684722 6.66133815e-16
# 0.208657048 2.77555756e-16
# 0.0848730769 4.4408921e-16
# -0.0412576507 5.55111512e-16
# -0.108582674 7.21644966e-16
# -0.107056602 5.55111512e-17
# -0.0666701878 -2.22044605e-16
# -0.0158209918 -4.4408921e-16
# 0.0281874666 -8.8817842e-16
# 0.049954566 -5.27355937e-16
# 0.0523270956 -2.63677968e-16
# 0.0525380063 -5.82867088e-16
# 0.0528959143 -5.27355937e-16
# 0.0453191338 -1.16573418e-15
# 0.0330344072 -9.99200722e-16
# 0.0228428894 -4.99600361e-16
# 0.0134555569 -4.99600361e-16
# 0.00548878417 -2.77555756e-17
# -0.00257031981 -1.38777878e-16
# -0.0265364003 2.56739074e-16
# -0.0754731872 -1.80411242e-16
# END