added hysteresis protections and magnet cycling; renamed TwoColorChicane -> TwoColorChicaneCurrent; added TwoColorChicaneDelay

devices/undulator.py

@@ -7,6 +7,9 @@ from logzero import logger as log
 
 from slic.core.adjustable import Adjustable, PVAdjustable, PVEnumAdjustable
 from slic.core.scanner.scanbackend import wait_for_all #, stop_all
+from slic.utils import cprint, tqdm_sleep
+
+from .delay_current import DelayCurrentConverter
 
 
 UND_NAME_FMT = "SATUN{:02}-UIND030"
@@ -313,18 +316,81 @@ class CHIC(PVAdjustable):
 
 
 
-class TwoColorChicane(PVAdjustable):
+class TwoColorChicaneCurrent(PVAdjustable):
 
-    def __init__(self, name):#, t0=0):
+    def __init__(
-#        self.t0 = t0
+        self,
-#        name += " Two Color Chicane"
+        pvname_setvalue="SATUN14-MBND100:I-SET", pvname_readback="SATUN14-MBND100:I-READ", name="Two Color Chicane as current",
-        super().__init__("SATUN14-MBND100:I-SET", "SATUN14-MBND100:I-READ", process_time=1, name=name)
+        accuracy=0.1, process_time=1,
+        hysteresis_protection=True,
+        **kwargs
+    ):
+        super().__init__(
+            pvname_setvalue, pvname_readback, name=name,
+            accuracy=accuracy, process_time=process_time,
+            **kwargs
+        )
+        self.hysteresis_protection = hysteresis_protection
 
-#    def set_target_value(self, value, hold=False):
+        self.cycle_time = 250
-#        super().set_target_value(value)
+        self.pv_cycle = PV("SATUN14-MBND100:CYCLE")
+        self.previous_target = None
 
-#    def get_current_value(self):
+
-#        return super().get_current_value()
+    def set_target_value(self, value, **kwargs):
+        current = self.get_current_value()
+        if value < current:
+            cprint(f"Hysteresis Warning: target value {value} is smaller than the current value {current}", color="red")
+        if self.hysteresis_protection and value == self.previous_target:
+            cprint(f"target value {value} is identical to previous target value, will not try to change", color="cyan")
+            return
+        self.previous_target = value
+        super().set_target_value(value, **kwargs)
+
+
+    def cycle_magnet(self):
+        self.pv_cycle.put(1, wait=True)
+        tqdm_sleep(self.cycle_time)
+        # set the current to 1 and 2 consecutively,
+        # since the results after the first step always looks strange
+        self.set_target_value(1).wait()
+        sleep(1)
+        self.set_target_value(2).wait()
+        sleep(1)
+
+
+
+class TwoColorChicaneDelay(Adjustable):
+
+    def __init__(self, ID="TWO-COLOR-CHICANE-DELAY", name="Two Color Chicane as delay", pvname_electron_energy="SATCB01:ENE-FILT-OP", hysteresis_protection=True, units="fs", **kwargs):
+        self.adj_current = TwoColorChicaneCurrent(hysteresis_protection=hysteresis_protection, internal=True)
+        self.pv_electron_energy = PV(pvname_electron_energy)
+        self.converter = DelayCurrentConverter()
+        super().__init__(ID, name=name, units=units, **kwargs)
+
+    def get_current_value(self):
+        current = self.adj_current.get_current_value()
+        delay = self.calc_delay_fs(current)
+        return delay
+
+    def set_target_value(self, delay):
+        current = self.calc_current_A(delay)
+        print(f"{current} A <- {delay} fs")
+        self.adj_current.set_target_value(current).wait()
+
+    def is_moving(self):
+        return self.adj_current.is_moving()
+
+    def cycle_magnet(self):
+        self.adj_current.cycle_magnet()
+
+    def calc_current_A(self, delay_fs):
+        electron_energy = self.pv_electron_energy.get()
+        return self.converter.current_A(delay_fs, electron_energy)
+
+    def calc_delay_fs(self, current_A):
+        electron_energy = self.pv_electron_energy.get()
+        return self.converter.delay_fs(current_A, electron_energy)