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11-energy.py
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11-energy.py
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import time as ttime
import os
import numpy as np
from ophyd import (PVPositioner, EpicsSignal, EpicsSignalRO, EpicsMotor,
Device, Signal, PseudoPositioner, PseudoSingle)
from ophyd.utils.epics_pvs import set_and_wait
from ophyd.ophydobj import StatusBase, MoveStatus
from ophyd.pseudopos import (pseudo_position_argument, real_position_argument)
from ophyd import Component as Cpt
from scipy.interpolate import InterpolatedUnivariateSpline
ANG_OVER_EV = 12398.42 # A*eV
# TODO move inside energy class
D_Si111 = 3.1293
#D_Si111 = 3.135555
# Converters:
def energy_to_gap(target_energy, undulator_harmonic=1):
fundamental_energy = target_energy / float(undulator_harmonic)
f = fundamental_energy
a = -53.025391
b1 = 0.220837
b2 = -3.537803e-4
b3 = 3.105219e-7
b4 = -1.587795e-10
b5 = 4.734179e-14
b6 = -7.633003e-18
b7 = 5.14881e-22
gap = a + b1*f + b2*f**2 + b3 * f**3 + b4 * f**4 + b5 * f**5 + b6 * f**6 + b7 * f**7 - 0.07
return gap
def energy_to_dcm_pitch(target_energy, offset=0.0):
x0 = 2189
x = target_energy
dcm_pitch = -1.086 + 4.6e-4 * np.exp(-(x-x0)/36) + 0.015 * np.exp(-(x-x0)/894) + 2.004 * np.exp(-(x-x0)/8.2e6)
print(f'dcm_pitch = {dcm_pitch}')
dcm_pitch += offset
return dcm_pitch
def energy_to_bragg(target_energy, delta_bragg=0):
bragg_angle = np.arcsin((ANG_OVER_EV / target_energy) / (2 * D_Si111)) / np.pi * 180 - delta_bragg
return bragg_angle
def wait_all(motors_list, sleep=0.0, debug=False):
"""Wait until the last motor finished movement.
:param motors_list: the list of all motors to wait.
:return: None
"""
while True:
motor_statuses = []
for m in motors_list:
motor_statuses.append(m.moving)
if debug:
print('Motor statuses: {}'.format(motor_statuses))
if True in motor_statuses:
ttime.sleep(sleep)
else:
break
def move_dcm(target_energy, delta_bragg=0):
bragg_angle = energy_to_bragg(target_energy, delta_bragg)
dcm_gap_value = (12.5)/np.cos(bragg_angle * np.pi / 180)
dcm.bragg.move(bragg_angle, wait=False)
dcm.dcmgap.move(dcm_gap_value, wait=True)
wait_all([dcm.bragg, dcm.dcmgap], sleep=0, debug=False)
print('DCM gap calculated : {:.5f}'.format(dcm_gap_value))
print('DCM gap from PV : {:.5f}'.format(dcm.dcmgap.get().user_readback))
print('Bragg angle calculated : {:.5f}'.format(bragg_angle))
print('Bragg angle from PV : {:.5f}'.format(dcm.bragg.get().user_readback))
class DCMInternals(Device):
pitch = Cpt(EpicsMotor, 'XF12ID:m67')
roll = Cpt(EpicsMotor, 'XF12ID:m68')
x = Cpt(EpicsMotor, 'XF12ID:m69')
class Energy(PseudoPositioner):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self._hints = None
# synthetic axis
energy = Cpt(PseudoSingle, kind='hinted', labels=['mono'])
# real motors
dcmgap = Cpt(EpicsMotor, 'XF12ID:m66', read_attrs=['user_readback'])
bragg = Cpt(EpicsMotor, 'XF12ID:m65', read_attrs=['user_readback'], labels=['mono'])
# dcmpitch = Cpt(EpicsMotor, 'XF12ID:m67', read_attrs=['readback'])
ivugap = Cpt(UndulatorGap,
'SR:C12-ID:G1{IVU:1',
read_attrs=['readback'],
configuration_attrs=['corrfunc_sta',
'corrfunc_dis',
'corrfunc_en'],
labels=['mono'])
enableivu = Cpt(Signal, value=True)
enabledcmgap = Cpt(Signal, value=True)
# this is also the maximum harmonic that will be tried
target_harmonic = Cpt(Signal, value=19)
# TODO make this a derived component
# TODO: if the energy.move is commanded to go to the current energy, then it will wait forever because nothing moves.
# wlambda = Cpt(Signal, value=0)
@pseudo_position_argument
def forward(self, p_pos):
energy = p_pos.energy
harmonic = self.target_harmonic.get()
if not harmonic % 2:
raise RuntimeError('harmonic must be odd')
if energy <= 2050:
raise ValueError("The energy you entered is too low ({} eV). "
"Minimum energy = 2050 eV".format(energy))
if energy >= 24001:
raise ValueError('The energy you entered is too high ({} eV). '
'Maximum energy = 24000 eV'.format(energy))
# compute where we would move everything to in a perfect world
target_ivu_gap = energy_to_gap(energy, harmonic)
while not (6.2 < target_ivu_gap < 25.10):
harmonic -= 2
if harmonic < 1:
raise RuntimeError('can not find a valid gap')
target_ivu_gap = energy_to_gap(energy, harmonic)
target_bragg_angle = energy_to_bragg(energy)
dcm_offset = 25
target_dcm_gap = (dcm_offset/2)/np.cos(target_bragg_angle * np.pi / 180)
# sometimes move the crystal gap
if not self.enabledcmgap.get():
target_dcm_gap = self.dcmgap.position
# sometimes move the undulator
if not self.enableivu.get():
target_ivu_gap = self.ivugap.position
return self.RealPosition(bragg=target_bragg_angle,
ivugap=target_ivu_gap,
dcmgap=target_dcm_gap)
@real_position_argument
def inverse(self, r_pos):
bragg = r_pos.bragg
e = ANG_OVER_EV / (2 * D_Si111 * math.sin(math.radians(bragg)))
return self.PseudoPosition(energy=float(e))
@pseudo_position_argument
def set(self, position):
energy, = position
print(position, self.position)
if np.abs(energy - self.position[0]) < .01:
return MoveStatus(self, energy, success=True, done=True)
return super().set([float(_) for _ in position])
energy = Energy(prefix='', name='energy',
read_attrs=['energy', 'ivugap', 'bragg'],
configuration_attrs=['enableivu', 'enabledcmgap', 'target_harmonic'])
dcm = energy
ivugap = energy.ivugap
# DCM motor shortcuts. Early scans used the names at right (p2h, etc).
dcm_gap = dcm.dcmgap # Height in CSS # EpicsMotor('XF12ID:m66', name='p2h')
dcm_pitch = EpicsMotor('XF12ID:m67', name='dcm_pitch')
# dcm_roll = dcm.roll # Roll in CSS # EpicsMotor('XF12ID:m68', name='p2r')
bragg = dcm.bragg # Theta in CSS # EpicsMotor('XF12ID:m65', name='bragg')
# dcm_x = dcm.x # E Mono X in CSS
bragg.read_attrs = ['user_readback']