Start-up of the Ohmic Phase in JET

JET has been designed to permit the study of plasmas in which α-particle heating is a significant part of the power balance. In order to have a sufficient thermonuclear yield and to trap the resulting α-particles, JET is similar in its dimensions and plasma current to the next generation of reactor-like devices such as NET, FER and INTOR. For this reason, the results from the study of the start-up of Ohmically heated plasmas in JET are highly relevant to the subject of this course. An impression might be given in what follows that JET is difficult to operate because the paper concentrates on the limits of operation. In fact JET has proven to be straightforward to operate and start-up has been highly reliable.