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The future JEM-EUSO instrument is a UV telescope to be installed on the International Space Station (ISS) with the goal of observing Extensive Air Showers created by Ultra-High Energy Cosmic rays. EUSO-balloon is a pathfinder mission for JEM-EUSO which flew in a stratospheric balloon from Timmins, Canada in August 2014. Due to its placement on the ISS, two major specifications of the JEM-EUSO instrument are that: i) the power allocated for the entire instrument should be no more than 1000 W; requiring that the power allocated to polarize the Photomultiplier Tubes (PMTs) should be less than∼50 W (using normal resistive voltage dividers requires nearly 2 kW), and ii) the light intensity reaching JEM-EUSO has a dynamic range larger than 106, going from the background illumination (about one photoelectron per pixel per 2.5 μs) up to Transient Luminous objects. Our solution for i) is to use a Cockcroft-Walton circuit to effectively create a separate power supply for each dynode, regrouping identical dynodes at the same power supply. These groups will be at the level of the Elementary Cell (EC, 4 PMTs). The required dynamic range will be provided by a switching circuit, giving an overall dynamic range of 106 in steps of 102 and in a time of several microseconds. Here we present the Cockcroft-Walton high voltage power supply design used in EUSO-Balloon. This design resulted in a power consumption of 630 mW to polarize the entire EUSO-Balloon focal surface (36 PMTs ), and the switching circuit was capable of reducing the focal surface collection efficiency within 2.5 μs.

A Cockcroft-Walton High-Voltage Power Supply for the EUSO Instruments