RF codes for Transp Transp User Course 2014 Jim Conboy.

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Presentation transcript:

RF codes for Transp Transp User Course 2014 Jim Conboy

RF codes JET RF heating (ICRH) is provided by  Four A2 Antenna  Two ‘Iter Like’ antenna ( for C22-24? only, & if you are lucky) Transp offers two RF heating codes – 24/11/142/14  Spruce  Old  Not very accurate  No longer supported (but works..)  Fast !  Toric  Fairly recent (Vn 5)  Accurate – benchmarked against AORSA  Slow, even with many processors

RF Heating - Options To add RF heating to a Transp run, need some details –  Which Antenna are active  What phasing was used Options –  Choice of RF code  To combine Antenna with same phasing & similar frequency  To add more Nphi (Torroidal mode number) values  Change grid sizes etc (not advisable) 24/11/143/14

RF Codes – FPP/Spruce FPP/SPRUCE is a package for comprehensive simulation of Neutral Beam Injection (NBI) and Ion Cyclotron Radio Frequency (ICRF) heating of tokamak plasmas. FPP solves the bounce-averaged Fokker-Planck equation to find the fast ion distribution function f(E,mu,r,t), as a function of energy E, magnetic moment mu, minor radius r and time t. It includes the bounce-averaged quasilinear RF heating operator and radial transport models as well as the collisional thermalization operator. The resulting 3-D Fokker-Planck equation (i.e., a convection- diffusion equation in 1 radial and 2 velocity dimensions) is solved using a conservatively-differenced operator-splitting technique (similar to the ADI algorithm). 24/11/144/14

RF Codes - Spruce SPRUCE solves a 3D wave equation (NOT ray-tracing) for the ICRF fast wave. It calculates the propagation, focussing, diffraction, and damping of the fast wave including the effects of fundamental and second harmonic ion damping, electron damping, and mode conversion. The power mode-converted to the Bernstein wave is estimated using an order-reduction scheme. The calculation can be summed over kz's to obtain a fully 3-D solution, although at the moment we use only a single dominant kz. Spruce is no longer supported 24/11/145/14

RF Codes - Toric 24/11/146/14

RF Codes - Toric 24/11/147/14

RF Codes - Toric 24/11/148/14

24/11/149/14 e Ion (?) Min. Ion

24/11/1410/14 Comparison of Codes Spruce – Ion Heating ?? Significant change, adding 2 nd Nphi value Agrees with Pion ( for minority heating) Toric – Good agreement between different versions  ~ 20% variations (in power deposition) between codes  Power deposited is constrained to equal input power (by Transp … )

24/11/1411/14 Comparison of Codes II Radial Power deposition – e - & I min

Spruce – (In)consistency 24/11/1412/14 ILA commissioning - Spruce – Minority Ion profile, 128 & 256 zones & Toric

TkToric (plotting package) 24/11/1413/14 Toric can generate some pretty plots …

Summary  If ICRH heating is small, or not a major concern – use Spruce  For shots where ICRF is a significant (or the only) heating, use Toric (with NMOD=63, default)  The ICRH directory (which contains the Transp-Toric interface files) is saved at times specified on OUTTIM card. Stand alone Toric can be run with higher resolution using this saved data. Further Reading –  Toric web pages (linked from JET Transp site)  Shots 74091/93/94 (Antenna phasing); (ILA); 69409J16 – 2 Torroidal modes 24/11/1414/14