750keV Cockcroft-Walton accelerator at KEK (The High-Energy Accelerator Research Organization) in Tsukuba, Japan.
<p>It consists of the voltage multiplier (right in this photo) and the ion source (left).
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Photographed on Open House day.
<a href="//commons.wikimedia.org/w/index.php?title=User:Kestrel&amp;action=edit&amp;redlink=1" class="new" title="User:Kestrel (page does not exist)">Kestrel</a>
<span class="int-own-work" lang="en">Own work</span>