Fusion Products

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TRANSP has the capabaility to follow up to 3 fast ion species using Monte Carlo techniques. These 3 species can be either beam species or fusion product species. To define a beam species to be tracked, use the namelist switches:

ABEAMA(i): The atomic weight of the i^th beam species.

XZBEAMA(i): The charge of the i^th beam species.

To control how these species are tracked use the namelist switch NALPHA. When set to 1 TRANSP will use a fast non-MC model developed by D. Mikkelson. This model has no orbit effects and assumes that the fusion alphas reach equilibrium with the background plasma instantaneously. With NALPHA set to 0 the full Monte Carlo model will be used and several further options are available:

NLFHE4: Set this flag to TRUE to turn on the MC fast He⁴ model. Futher options are available:

NPTCLF: Set this to the constant census of MC particles to be tracked (default 1000).
PLFHE4: Sets a power threshold below which reduced MC statistics a used. For a He⁴ power H < PLFHE4 a fraction f=H / PLFHE4 of the specified constant census is used.

NLFHE3: Set this flag to TRUE to turn on the MC fast He³ model. As above a He³ power threshold PLFHE3 can be set.

NLFST: Set this flag to TRUE to turn on the MC fast D-D fusion triton model. As above a fusion triton power threshold PLFST can be set.

NLFSP: Set this flag to TRUE to turn on the MC fast D-D fusion proton model. As above a fusion proton power threshold PLFSP can be set.

NLFATOM: Set this flag to TRUE to include atomic physics effects such as charge exchange when tracking the fusion product populations.

Renormalisation

It is possible to use 1D input Ufile data for the total production rates of the various fast ion populations as a function of time to renormalise the profiles determined from simulation. This is done using the following switches:

NLUSFA: Set this flag to TRUE to read in He⁴ data using trigraph SFA.

NLUSF3: Set this flag to TRUE to read in He⁴ data using trigraph SF3.

NLUSFT: Set this flag to TRUE to read in D-D fusion triton data using trigraph SFT.

NLUSFP: Set this flag to TRUE to read in D-D fusion proton data using trigraph SFP. Note that it is not possible to set both NLUSFT=TRUE and NLUSFP=TRUE as these both renormalise the fast deuterium population.

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