1. Code Name: GET3D

2. Category: IXb. Particle Code: Gyrokinetic

3. Responsible Physicist: S. Parker

4. Others involved in code development: J.C. Cummings, R.A. Santoro, W. W. Lee, M.Tran, V.Decyk

5. One line description: Radially global 3D fully nonlinear delta-f electrostatic gyrokinetic particle code in toroidal geometry.

6. Computer systems which code runs on: Cray C-90 multi-tasking, SUN, CM2/200, CM5, T3D, CMFortran, PVM, NCAR, NetCDF

7. Typical running time: Production run take 1-6 hours.

8. Approximate number of code lines: 12,000

9. Does this code read data files from another code? Yes, code can optionally read in MHD equilibria from a MHD equilibrium code.

10. Does this code produce data files that can be read by another code? No.

11. 1-2 paragraph description of code: This is a 3D toroidal fully nonlinear delta-f code for studying electrostatic turbulence and transport. GET3D has equilibrium variation of profiles, realistic magnetic equilibrium effects, such as finite- beta, elongation, and trangularity. It also has the effect of equilibrium and self-generated shear flows.

12. Similar codes to this code, and distinguishing differences: This is was the first 3D toroidal gyrokinetic code, and has provided a standard for other codes in this research area. Currently, there are 2 other similar codes one at UCLA and one at IFS. Without doubt, GET3D is the most advanced and most widely used code of its type.

13. Journal References describing code (up to 3):

``Gyrokinetic Simulation Studies of Transport Barriers,'' S.E.Parker, et al., to appear in Physics of Plasmas, 3 (May) (1996).

``Gyrokinetic Simulation of ITG Driven Turbulence in 3D Toroidal Geometry,'' S.E. Parker, W.W.Lee and R.A. Santoro, Physical Review Letters 71 2042 (1993).

``A Fully Nonlinear Characteristic Method for Gyrokinetic Simulation,'' S.E.Parker and W.W.Lee, Physics of Fluids B 5 77 (1993).

14. New code capabilities planned for next 1-2 years: Magnetic coordinates, improved electron dynamics, electromagnetic effects.

15. Code users: S. Parker, W. W. Lee, R. Santoro (UC-Irvine), M.Tran (EPFL), J. Cummings (LANL), V.Decyk (UCLA), P.Liewer (JPL).

16. Present and recent applications of code: ITG, trapped ion modes

17. Status of code input/output documentation. Check one: ( ) does not exist ( ) incomplete (X) exists (in terms of readme files)

18 Year Code was first used and present frequency of use: First developed 1991-92, regularly used, and currently used by the people in item 15.

19. Estimate of Man-Years invested in developing code: 2

20. Categories of usage of Code (Check all that apply): (x) application code to do analysis and prediction of experiments (x) numerical testbed of theoretical ideas ( ) physics module to be used in integrated modeling ( ) code for machine design

21. Language code is written in: Fortran, CMFortran, with PVM, NCAR, NetCDF

22. Results of inter-comparisons with other codes and results of validation against experiments. Active participation with NTP code comparisons, similar spectral features found as seen experimentally using Beam Emission Spectroscopy, and Reflectometry. ``Comparisons of Gyrofluid and Gyrokinetic Simulations,'' S.E.Parker, et al., Physics of Plasmas 1 1461 (1994). ``Plasma Turbulence and Associated Transport in TFTR D-D and D-T Discharges,'' R.J.Fonck, et al., 15th Int. Conf. on Plasma Phys. and Contr. Fusion Nuclear Research, Seville, Spain, Oct. 1994.