Page History
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- Water background is evaluated WITH COMMON MODE CORRECTION that enhance intensity of central 2x1... - needs to be re-calibrated
DO NOT use common mode
- polarization factor map should be rotated by 90 degree because of requested by Meng fancy 90 degree rotation in the geometry file
- USE status mask
- USE radial background subtraction for single angular bin
| Code Block |
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Xarr = sp.det.coords_x(runnum)
Yarr = sp.det.coords_y(runnum)
sp.rb = RadialBkgd(Xarr, Yarr, mask=sp.nda_smask, radedges=(5200, 80000), nradbins=200, nphibins=1)
sp.pf = polarization_factor(sp.rb.pixel_rad(), sp.rb.pixel_phi()+90, sp.DETD_um)
nda_raw = sp.det.raw(evt)
if nda_raw is not None :
nda = np.array(nda_raw, dtype=np.float32, copy=True)
nda -= sp.nda_peds
#nda = subtract_bkgd(nda, sp.nda_bkgd, mask=sp.nda_smask, winds=sp.winds_bkgd, pbits=0)
nda = sp.rb.subtract_bkgd(nda.flatten() * sp.pf)
nda.shape = sp.nda_peds.shape
nda *= sp.nda_smask
#sp.det.common_mode_apply(evt, nda)
img = getImage(evt, nda) |
Fit results
ARC region, fit converged to beta ~ -17°
Image corrected up to 80mm:
ARC region, fit converged to beta ~ -9°
Averaged Fraser- transformed image using angles from fit to 2 arc peaks
OLD IMAGE PROCESSING:
Distance between 2 peaks in Arc region
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