Detached operation close to the density limit is a preferred mode of operation in reactors because it allows the reduction of the power laod on the divertor targets by radiatign a significant part of the power in the divertor volume. Previously, it has been found that in JET high-density plasmas the power carried by neutral particles can be a significant fraction of the total loss power [1,2]. It is important to understand the physical processes in the diertor that give rise to the electromagnetic radiation and to the power loss by neutral particles that are produced by charge-exchange processes.
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