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Code Block
ttData = evt.get(TimeTool.DataV2, self.timeToolKey)
ttdata.position_pixel() # position of edge, in pixels
ttdata.amplitude()      # amplitude of edge, in pixels
ttdata.nxt_amplitude()  # amplitude of second-most-significant edge, in pixels
ttdata.position_fwhm()  # FullWidthHalfMax of the differentiated signal (corresponds to slope of edge) in pixels
ttdata.position_time()  # position of the most significant edge, (see innote fsbelow)

Note that the position_time() results depend on have appropriate calibration constants deployed to the TimeTool configuration in a variable like this (in this case done as an argument to psana.setOptions():

Code Block
'TimeTool.Analyze.calib_poly':'0 1 0'
 

The three variables are coefficients of a quadratic polynomial that convert pixel number into time.  These constants are typically determined by the hutch scientists.

Controlling Laser/Beam Logic

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