The complex nature of the JET machine requires a large amount of control parameter preparation, selection and validation before a pulse may be started. Level-l is defined as the centralised, cross-subsystem control of JET. Before it was introduced over 10 years ago [1], the Session Leader (SL) who is responsible for specifying the parameter settings for a JET pulse, had virtually no software available to help him except for a simple editor used for the creation of control waveforms. Most of the required parameter settings were calculated by hand and then passed on either verbally or via hand-written forms.
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