def setUp(self):
"""
Create new Langmuir object for every test
"""
if em.position > co.position:
raise ValueError("Initialization em.position > co.position.")
self.t = Langmuir(em, co)
self.em = em
self.co = co
# Create `Langmuir` objects for each regime: accelerating,
# space charge limited, and retarding.
saturation_point_voltage = self.t.saturation_point_voltage()
critical_point_voltage = self.t.critical_point_voltage()
# accelerating mode:
accelerating_voltage = saturation_point_voltage - units.Quantity(
1., "V")
co_accelerating = Metal(**co_params)
co_accelerating.voltage = accelerating_voltage
self.t_accel = Langmuir(em, co_accelerating)
# space charge limited mode:
scl_voltage = (saturation_point_voltage + critical_point_voltage) / 2
co_scl = Metal(**co_params)
co_scl.voltage = scl_voltage
self.t_scl = Langmuir(em, co_scl)
# retarding mode:
retarding_voltage = critical_point_voltage + units.Quantity(1., "V")
co_retarding = Metal(**co_params)
co_retarding.voltage = retarding_voltage
self.t_ret = Langmuir(em, co_retarding)
def setUp(self):
"""
Create new Langmuir object for every test
"""
if em.position > co.position:
raise ValueError("Initialization em.position > co.position.")
self.t = Langmuir(em, co)
self.em = em
self.co = co
# Create `Langmuir` objects for each regime: accelerating,
# space charge limited, and retarding.
saturation_point_voltage = self.t.saturation_point_voltage()
critical_point_voltage = self.t.critical_point_voltage()
# accelerating mode:
accelerating_voltage = saturation_point_voltage - units.Quantity(1., "V")
co_accelerating = Metal(**co_params)
co_accelerating.voltage = accelerating_voltage
self.t_accel = Langmuir(em, co_accelerating)
# space charge limited mode:
scl_voltage = (saturation_point_voltage + critical_point_voltage) / 2
co_scl = Metal(**co_params)
co_scl.voltage = scl_voltage
self.t_scl = Langmuir(em, co_scl)
# retarding mode:
retarding_voltage = critical_point_voltage + units.Quantity(1., "V")
co_retarding = Metal(**co_params)
co_retarding.voltage = retarding_voltage
self.t_ret = Langmuir(em, co_retarding)
