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import logging
import pyvisa
import numpy as np
from qolab.hardware.power_supply.keysight_e3612a import KeysightE3612A
import qolab.tsdb as tsdb
# this should be done before justpy is called or log formatter does not work
logging.basicConfig(
format="%(asctime)s %(levelname)8s %(name)s: %(message)s",
datefmt="%m/%d/%Y %H:%M:%S",
)
tmplogger = logging.getLogger("qolab.tsdb")
tmplogger.setLevel(logging.INFO)
logger = logging.getLogger("BfieldDriver")
logger.setLevel(logging.INFO)
class BfieldDriver(KeysightE3612A):
"""need to set power supply"""
def __init__(self, *args, **kwds):
super().__init__(*args, **kwds)
self.config[
"Device type"
] = "B field coil driver based on Keysight E3612A power supply"
self.config["Device model"] = "v0.1"
self.deviceProperties = self.deviceProperties.union(
{"B", "Bslope_TperA", "CoilAssignment"}
)
""""
Rough magnetic field calibration of the 3 axes coils in large magnetic shield
- Ch1: 70mA -> 650 kHz shift for delta m = 2
- Ch2: 70mA -> 700 kHz shift for delta m = 2
- Ch2: 70mA -> 659 kHz shift for delta m = 2
A better calibration obtained on 20220601 see file
20220601.magnetic_field_callibration/calibration_currentToB.dat
"""
# B response to current in a given channel
# Olivia's Calibration with flux gate magnetometer used from 2023/04/28
# +/- 0.0000007
self._Bslope_TperA = {1: 0.00065859269, 2: 0.00070732580, 3: 0.00066754994}
"""
# Irina's Calibration used prior 2023/04/27
self._Bslope_TperA = {
1: 0.0006571429,
2: 0.0007085714,
3: 0.0006675714
}
# Eugeniy's Calibration
self._Bslope_TperA = {
1: 0.0006574710928926532,
2: 0.0007064314754023079,
3: 0.0006635058865577695
}
"""
# assuming that Ch1 controls Bz, Ch2 -> Bx, Ch3 -> By
self._coil_assignment = {"chX": 2, "chY": 3, "chZ": 1}
def getBslope_TperA(self):
return self._Bslope_TperA
def getCoilAssignment(self):
return self._coil_assignment
def getB(self):
Bslope_TperA = self.getBslope_TperA()
coil_assignment = self.getCoilAssignment()
chX = coil_assignment["chX"]
chY = coil_assignment["chY"]
chZ = coil_assignment["chZ"]
Ix = self.getChanIout(chX)
Iy = self.getChanIout(chY)
Iz = self.getChanIout(chZ)
Bx = Ix * Bslope_TperA[chX]
By = Iy * Bslope_TperA[chY]
Bz = Iz * Bslope_TperA[chZ]
Bmag = float(np.sqrt(Bx * Bx + By * By + Bz * Bz))
theta = float(np.arccos(Bz / Bmag))
phi = float(np.arctan2(By, Bx))
theta_degree = float(theta / np.pi * 180)
phi_degree = float(phi / np.pi * 180)
return {
"Bmag": Bmag,
"theta": theta,
"phi": phi,
"theta_degree": theta_degree,
"phi_degree": phi_degree,
"Bx": float(Bx),
"By": float(By),
"Bz": float(Bz),
}
def setB(self, Bmag=50e-6, theta=0, phi=0):
"""Sets B field currents based on B (in T) and angles theta, and phi"""
self._Bmag = Bmag
self._theta = theta
self._phi = phi
Bx = Bmag * np.sin(theta) * np.cos(phi)
By = Bmag * np.sin(theta) * np.sin(phi)
Bz = Bmag * np.cos(theta)
Bslope_TperA = self.getBslope_TperA()
coil_assignment = self.getCoilAssignment()
chX = coil_assignment["chX"]
chY = coil_assignment["chY"]
chZ = coil_assignment["chZ"]
Ix = Bx / Bslope_TperA[chX]
Iy = By / Bslope_TperA[chY]
Iz = Bz / Bslope_TperA[chZ]
logger.info(f"Setting {Bmag=}, {theta=} {phi=} in radians")
logger.info(f"Setting {chX=} to {Ix}")
logger.info(f"Setting {chY=} to {Iy}")
logger.info(f"Setting {chZ=} to {Iz}")
self.setChanIout(chX, Ix)
self.setChanIout(chY, Iy)
self.setChanIout(chZ, Iz)
return Ix, Iy, Iz
def setBinDegrees(self, Bmag=50e-6, theta=0, phi=0):
logger.info(f"Setting {Bmag=}, {theta=} {phi=} in degrees")
return self.setB(Bmag=Bmag, theta=theta / 180 * np.pi, phi=phi / 180 * np.pi)
# TSDB logger setting
tsdb_client = tsdb.Client("influx", "http://qo.physics.wm.edu:8428", database="qolab")
tsdb_ingester = tsdb.Ingester(tsdb_client, batch=11, measurement_prefix="VAMPIRE.VCSEL")
logger.info("Accessing hardware")
rm = pyvisa.ResourceManager()
instr = rm.open_resource("USB0::10893::4354::MY61001869::0::INSTR")
app_nickname = "BfieldDriver"
Bfield = BfieldDriver(
instr,
device_nickname=".".join([app_nickname, "b_field_driver"]),
tsdb_ingester=None,
)
print("Use me as : Bfield.setBinDegrees(theta=Angle, phi=Angle)")
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