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README
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ext_src
C. DeTar 2/12/2008
Code for extracting an extended source from a staggered or Dirac
propagator. The source is written to a SciDAC formatted file. An
input Dirac propagator produces twelve Dirac source records, one for
each underlying source spin and color. An input staggered propagator
produces either twelve naive Dirac source records or three color
vector field records. The extended source can be smeared and momentum
can be inserted.
Sample input parameter file
The file begins with the standard MILC stanza defining the lattice
dimensions.
prompt 0
nx 4
ny 4
nz 4
nt 8
Next comes the job ID:
job_id 203696.kaon2.fnal.gov
The next series of stanzas specifies the input propagator files.
# Description of quarks
The number of propators to process
number_of_quarks 3
# quark 0
Parameters for the first propagator
quark_type clover
Choices for quark types are "KS" and "clover". See clover example
below.
Propagator files for this quark
The code recognizes FNAL, MILC, and SciDAC KS formats.
reload_serial_wprop ../binary_samples/wprop_fm.sample.l4448.ll
save_serial_scidac_w_source out.test.w_source.1
Time slice to extract for the extended source.
t0 4
Smearing information for the extended source.
# smearing for quark 0
Input smearing file
complex_field_fm
load_sink ../binary_samples/smear_fm.sample.l4448.ll
Smearing momentum
momentum 1 0 0
Label for smearing
sink_label 1S
Gamma matrix to be applied to the extended source
sink_gamma G5
Stanza for the second propagator
# quark 1
quark_type KS
reload_serial_ksprop ../binary_samples/ksprop_fm.sample.l4448.ll
save_serial_scidac_ks_source out.test.ks_source.1
t0 4
# smearing for quark 1
Here is how we specify no smearing
point
origin 0 0 0
sink_label d
Gamma matrix to be applied to the extended source
sink_gamma G5
Stanza for the third propagator
# quark 2
quark_type KS
reload_serial_ksprop ../binary_samples/ksprop_fm.sample.l4448.ll
Specifying a Wilson (Dirac) extended source causes the staggered
propagator to be converted to naive. In the staggered to naive
conversion we assume that the staggered source has support only on
hypercube corners.
save_serial_scidac_w_source out.test.ks_source_naive.1
t0 4
# smearing for quark 2
complex_field_fm
load_sink ../binary_samples/smear_fm.sample.l4448.ll
momentum 0 0 0
sink_label 1S
Gamma matrix to be applied to the extended source
sink_gamma G5