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# Current Derive Power Circuit @ the tokamak GOLEM

## Scheme

![](CurrentDeriveCircuitDiagram.png)

[svg source](CurrentDeriveCircuitDiagram.svg)

## Flowchart diagram (initiation)

![](VacuumSystemOperation.png)

[svg source](VacuumSystemOperation.svg)

## Codes

### charge_CD_capacitors (api.py)
~~~
def charge_CD_capacitors(shared_namespace, controller, relay_action_lock, slow_charging_activated, target_voltage):
    if target_voltage > global_config.Ucd_limit:
        log.warning('target voltage {} V over Ucd limit {} V, charging only to limit'.format(
            target_voltage, global_config.Ucd_limit))
        target_voltage = global_config.Ucd_limit
    voltage = controller.get_capacitor_voltage(2)
    while voltage <= target_voltage:
        log.debug("CD capacitor voltage: %.2f V" % voltage)
        with relay_action_lock:
            voltage = controller.get_capacitor_voltage(2)
        if not slow_charging_activated.is_set() and voltage >= 0.98 * target_voltage:   #charging at 98%
            slow_charging_activated.set()       #prevent others from disabling slow_charge
            with relay_action_lock:
                controller.control_Quido_set(-7) # engage large charging resistor
                log.debug("CD slow charge activated")
                sleep(0.1)                            #prevent voltage peaks
        sleep(0.5)
    with relay_action_lock:
        controller.CD_control_Quido_set(-1) # disengage charging
        log.debug("CD charging disengaged")
        sleep(1)                        #wait for full relay action
        controller.control_Quido_set(+7)   # disengage large resistor
        log.debug("CD slow charging deactivated")
        sleep(0.1)                             # prevent voltage peaks being measured
    slow_charging_activated.clear()
    controller.panel_Quido_set(+20) # Et capacitors charged - signal on panel
    
~~~

## Connectivity with control system

![](VacuumControlSystem.png)

[svg source](VacuumControlSystem.svg)

## Photogallery