Kite Experiment

"KITE (Kounotori Integrated Tether Experiment) is an experimental electrodynamic tether (EDT).[4][5] The tether is equipped with a 20 kg end-mass, and will be 700 m long when deployed.[4] A maximum 10 mA current will run through the tether.[4] Kounotori's ISS rendezvous sensor will be utilized to measure how the end-mass moves during the test.[4] The EDT experiment will be conducted following Kounotori 6's departure from the ISS, and is to be held for a week.[4] After the experiment, the tether will be separated before the spacecraft proceeds with the de-orbit maneuvers. The main objective of this experiment is the orbital demonstration of both extending an uncoated bare-tether, and driving electric currents through the EDT.[5] These two technologies will contribute to gaining capabilities to remove space debris.[5]"

And for a detailed setup........

http://spaceflight101.com/htv-6/htv-kite-experiment/