# nb-filtering-cogwheel-159.in

# approach: filtering the desired coherence (7Q) after the first pulse
#           and (1Q) after the second pulse

# spin-9/2 echo amplitude optimization
# versus the first-pulse duration
# in three-pulse split-t1 7QMAS sequence,
# the second-pulse duration p2 = 4 micro seconds
# the third-pulse duration p3 = 2 micro seconds

spinsys {
  channels 93Nb
  nuclei   93Nb

  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   159*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)

  matrix set 1 coherence {7}
  matrix set 2 coherence {1}

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

proc main {} {
  global par

  fsave [fsimpson] $par(name).fid
  puts "Larmor frequency (Hz) of 93Nb: "
  puts [resfreq 93Nb $par(proton_frequency)]
}

#SIMP
#NP=17
#SW=4000000
#TYPE=FID
#DATA
#0 0
#1.1429838e-15 3.32336168e-17
#1.5419748e-11 -2.72292235e-16
#3.2870394e-09 -9.2131195e-16
#1.4721821e-07 -6.25656558e-16
#2.74301448e-06 -1.76950096e-16
#2.87963396e-05 -2.06312043e-16
#0.000200314105 1.08981234e-15
#0.00101787405 1.82266103e-15
#0.00402646171 5.35529484e-16
#0.012959508 1.2500145e-15
#0.0350500976 2.19430875e-15
#0.0816375723 4.70779302e-15
#0.166972309 5.55181272e-15
#0.304730344 4.05351632e-15
#0.503102226 1.59654065e-15
#0.760552475 -3.11726074e-16
#END