cast_scan.py

import epics as epics
import numpy as np
import time as time
import datetime

now = datetime.datetime.now()
filename = 'pcav_cast_scan_' + now.strftime('%Y-%m-%d-%H-%M-%S') + '.txt'
print(filename)
f = open(filename, 'w')

# Define the PV variables
HXR_PCAV_PV0 = 'SIOC:UNDH:PT01:0:TIME0'
HXR_PCAV_PV1 = 'SIOC:UNDH:PT01:0:TIME1'
HXR_CAST_PS_PV_W = 'LAS:UND:MMS:02'
HXR_CAST_PS_PV_R = 'LAS:UND:MMS:02.RBV'
SXR_PCAV_PV0 = 'SIOC:UNDS:PT01:0:TIME0'
SXR_PCAV_PV1 = 'SIOC:UNDS:PT01:0:TIME1'
SXR_CAST_PS_PV_W = 'LAS:UND:MMS:01'
SXR_CAST_PS_PV_R = 'LAS:UND:MMS:01.RBV'

# Assign the beamline specific PV to the general purpose call variables 
CAST_PS_PV_W = SXR_CAST_PS_PV_W
CAST_PS_PV_R = SXR_CAST_PS_PV_R
PCAV_PV0 = SXR_PCAV_PV0
PCAV_PV1 = SXR_PCAV_PV1

pause_time = 1   # Let's give some time for the system to react
phase_steps = 2000  # How many steps we are taking 
phase_gap = 0.001      # number of ps we are increasing each time
CAST_PS_target = 0  # Targeted value for the phase shifter

PCAV_Val_ary = np.zeros((phase_steps,))

# let's get the current value of the phase shifter
CAST_PS_init_Val = epics.caget(HXR_CAST_PS_PV_R)
CAST_PS_target = CAST_PS_init_Val

for y in range(0,phase_steps):
    # print('epics.caget(CAST_PS_PV_R)')
    print(y)
    CAST_PS_target = CAST_PS_target+(phase_gap)
    print(CAST_PS_target)
    f.write(str(CAST_PS_target) + ',')
    print('epics.caput(' + CAST_PS_PV_W + ', ' + str(CAST_PS_target) + ')')
    # epics.caput(CAST_PS_PV_W, CAST_PS_target)
    time.sleep(pause_time)
    print('PCAV value')
    PCAV_Val_ary[y] = epics.caget(PCAV_PV0)
    print(PCAV_Val_ary[y])
    f.write(str(PCAV_Val_ary[y]) + '\n')
    print('==========================================')

epics.caput(CAST_PS_PV_W, CAST_PS_init_Val)
# f.close()
# print(y)
# print(now.strftime('%Y-%m-%d-%H-%M-%S'))