[{"type":"speech","title":"Status of the 1-MW, 140-GHz, CW series-gyrotrons for W7-X","issued":{"date-parts":[["2006"]]},"author":[{"family":"Dammertz","given":"G."},{"family":"Alberti","given":"S."},{"family":"Arnold","given":"A."},{"family":"Erckmann","given":"V."},{"family":"Gantenbein","given":"G."},{"family":"Giguet","given":"E."},{"family":"Heidinger","given":"R."},{"family":"Hogge","given":"J. P."},{"family":"Illy","given":"S."},{"family":"Kasparek","given":"W."},{"family":"Koppenburg","given":"K."},{"family":"Laqua","given":"H."},{"family":"Legrand","given":"F."},{"family":"Leonhardt","given":"W."},{"family":"Lievin","given":"C."},{"family":"Michel","given":"G."},{"family":"Neffe","given":"G."},{"family":"Piosczyk","given":"B."},{"family":"Schmid","given":"M."},{"family":"Thumm","given":"M."},{"family":"Tran","given":"M. Q."}],"note":"18th Joint Russian-German STC Workshop on ECRH and Gyrotrons, Nizhny Novgorod, Russia, June 20-27, 2006","abstract":"\u00a0\n\u00a0\nDammertz G., Alberti S., Arnold A., Erckmann V., Gantenbein G., Giguet E., Heidinger R., Hogge J.P., Illy S., Kasparek W., Koppenburg K., Laqua H., Legrand F., Leonhardt W., Li\u00e9vin C., Michel G., Neffe G., Piosczyk B., Schmid M., Thumm M., Tran M.Q.:\n\u00a0\n\u00a0\nAbstract: The first series gyrotron for the Stellarator W7-X at Greifswald delivered a power of 920 kW at an efficiency of 45% (with energy recovery) at a pulse length of 180 s. 30 minute pulses were performed with the same output power at slightly reduced efficiency.\nThe second series tube delivered 1 MW with a pulse length of 1 ms and about 800 kW for 3 ms. For the longer pulse the accelerating voltage had to be reduced in order to avoid mode hopping. The results will be reported.","kit-publication-id":"230064722"}]