A method for enhancing the quality of a charged particle microscopic image of a sample is disclosed. A first dewatering zone has at least one stationary, first forming shoe followed by a pulsating strip cover. Some of the HSSI clock signals may be routed through the clock distribution network of the associated PLD logic circuitry. Such fuel flow control and mixing is performed passively whenever a vibration alert occurs, or is performed actively in response to monitoring the status of the fuel cell assembly.