UPDATE 2-Japan H1 copper output to rise 4 pct on solid local demand, higher fees

(Releads, writes through adding background, data) By Yuka Obayashi TOKYO, April 7 (Reuters) - Copper output in Japan is expected to rise 4.4 percent in the six months between April and September from the same period last year, Reuters calculations showed on Monday, driven by recovering local demand and higher processing fees. Pan Pacific Copper (PPC), Japan's biggest copper smelter and a unit of Japan's JX Holdings Inc, said it was aiming for a 5.5 percent increase in its refined cop