Scan Commands

• ascan, a2scan, a3scan, a4scan, amultiscan Absolute motor scans on a 1D path. The scan interval is specified by supplying a start and end position for each motor. After a scan has ended the motor(s) remain at the final scan position.

  p09/door/exp.01 [37]: ascan exp_dmy01 0 1 20 0.1
  p09/door/exp.01 [38]: a2scan exp_dmy01 0 1 exp_dmy02 5 7 20 0.1
  

  'ascan': motor exp_dmy01 is scanned from 0 to 1, the number of intervalls is 20, the sample time is 0.1.

  'a2scan': motor exp_dmy01 is scanned from 0 to 1 while exp_dmy02 is scanned from 5 to 7.

  monitor (preset) mode: The monitor counts are specified as a negative sample time. A value of -1 corresponds to 1000000 monitor counts.

• dscan, d2scan, d3scan, d4scan, dmultiscan Relatine motor scans on a 1D path. The scan interval is specified by supplying the offset for the start and end position relative to the current motor position. After a scan has ended the motor(s) move back to the before-scan position(s).

  p09/door/exp.01 [37]: dscan exp_dmy01 -1 1 20 0.1
  

• timescan Scan without motor.

  p09/door/exp.01 [37]: timescan 0 10 20 0.1
  

  The dummy scan functionality can also be performed using a dummy motor.

• fscan. N-dimensional scan along user defined paths. The motion path for each motor is defined through the evaluation of a user-supplied function that is evaluated as a function of the independent variables.
  • Independent variables are supplied through the indepvar string. The syntax for indepvar is "x=expresion1,y=expresion2,...".
  • If no indep vars need to be defined, write "!" or "*" or "None"
  • Motion path for motor is generated by evaluating the corresponding function 'func'.
  • Count time is given by integ_time. If integ_time is a scalar, then the same integ_time is used for all points. If it evaluates as an array (with same length as the paths), fscan will assign a different integration time to each acquisition point.
  • If integ_time is positive, it specifies seconds and if negative, specifies monitor (preset) counts (times 10**6).
  IMPORTANT Notes:
  • No spaces are allowed in the indepvar string.
  • All funcs must evaluate to the same number of points
  EXAMPLE: fscan x=[1,3,5,7,9],y=arange(5) motor1 x**2 motor2 sqrt(y*x-3) 0.1

  Arguments: independent variables, list of motor and path curves, integration time.

• mesh A 2D grid scan.