# al-zfilter-amplitude-36-cycling-p2.in

# approach: 36-phase cycling the first pulse, the second pulse and the receiver

# spin-5/2 echo and antiecho amplitude optimization
# versus the second-pulse duration
# in three-pulse z-filtered amplitude-modulated 3Q-MAS sequence,
# the first-pulse duration p1 = 4 micro seconds
# the third-pulse duration p3 = 2 micro seconds

spinsys {
  channels 27Al
  nuclei   27Al
  quadrupole 1 2 3e6 0 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     93000
  variable p1      4 
  variable p3      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)  $par(ph2)
    pulse $par(p3)              $par(rf3) x
    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  60   90}\
             { 60  60  270}\
             {120  60   90}\
             {180  60  270}\
             {240  60   90}\
             {300  60  270}\
             {  0 120  270}\
             { 60 120   90}\
             {120 120  270}\
             {180 120   90}\
             {240 120  270}\
             {300 120   90}\
             {  0 180   90}\
             { 60 180  270}\
             {120 180   90}\
             {180 180  270}\
             {240 180   90}\
             {300 180  270}\
             {  0 240  270}\
             { 60 240   90}\
             {120 240  270}\
             {180 240   90}\
             {240 240  270}\
             {300 240   90}\
             {  0 300   90}\
             { 60 300  270}\
             {120 300   90}\
             {180 300  270}\
             {240 300   90}\
             {300 300  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 27Al: "
  puts [resfreq 27Al $par(proton_frequency)]
}

# SIMP
# NP=17
# SW=4000000
# TYPE=FID
# DATA
# 0 0
# 0.039178103 3.47407041e-05
# 0.275265705 -0.00066532614
# 0.686073613 -0.0045411431
# 1.02597311 -0.0122746023
# 1.12430275 -0.0221763955
# 0.980082439 -0.0360497325
# 0.490928617 -0.0603974161
# -0.690046692 -0.0962139712
# -2.82474734 -0.130248489
# -5.63632279 -0.142309905
# -8.3505573 -0.122966279
# -10.2509311 -0.0823005928
# -11.1767071 -0.0399843562
# -11.5458829 -0.00841642709
# -11.9302713 0.0120061503
# -12.6017732 0.0243159492
# END