# al-zfilter-3Q-amplitude-24p2p3-filtering-p3.in

# approach: filtering the desired coherences after the first pulse
#           and after the second pulse, three times

# spin-5/2 echo and antiecho amplitude optimization
# versus the third-pulse duration
# in three-pulse z-filtered amplitude-modulated 3Q-MAS sequence,
# the first-pulse duration p1 = 4 micro seconds
# the second-pulse duration p2 = 4 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   24*I1z
  detect_operator  I1c
  verbose          1101
  variable rf      90000
  variable rf3     9300
  variable p1      4
  variable p2      4 
  variable nb1     0 
  variable nb2     0 
}

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

  matrix set 1 coherence {-1  5}
  matrix set 2 coherence { 1 -5}
  matrix set 3 coherence {-3  3}
 
  matrix set 10 coherence {-4}
  matrix set 20 coherence {4}
  matrix set 30 coherence {0}

  acq -y        
  pulse  $par(p1) $par(rf) x
    filter $par(nb1)
  pulse  $par(p2) $par(rf) x
    filter $par(nb2)

  for {set i 1} {$i < $par(np)} {incr i} {
    pulse $par(tsw) $par(rf3) x 
    acq -y
  }
}

proc main {} {
  global par

  for {set j 1} {$j < 4} {incr j} {
    set par(nb1) $j
    set par(nb2) [expr 10*$j]

    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
# -0.070479629 4.29093862e-05
# -0.14206609 0.000172281294
# -0.215730654 0.000387721823
# -0.292088757 0.000686561135
# -0.371157047 0.00106418264
# -0.452223878 0.00151560225
# -0.533920154 0.00203779748
# -0.614468691 0.00263111477
# -0.692037452 0.00329833479
# -0.765049988 0.00404270674
# -0.832322408 0.00486681145
# -0.893078653 0.00577152255
# -0.946976273 0.00675389388
# -0.994163069 0.00780472957
# -1.0353101 0.00890724722
# -1.07156535 0.0100382426
# END