Density Limit

Several density limit models¹ are available in PROCESS. These are calculated in routine culdlm, which is called by physics. To enforce any of these limits, turn on constraint equation no. 5 with iteration variable no. 9 (fdene). In addition, switch idensl must be set to the relevant value, as follows:

idensl	Description
1	ASDEX model
2	Borrass model for ITER, I
3	Borrass model for ITER, II
4	JET edge radiation model
5	JET simplified model
6	Hugill-Murakami $M.q$ model
7	Greenwald model: $n_G=10^{14} \frac{I_p}{\pi a^2}$ where the units are m and ampere. For the Greenwald model the limit applies to the line-averaged electron density, not the volume-averaged density.

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1. T. C. Hender et al., 'Physics Assessment for the European Reactor Study', ↩