1. Code Name: FT3D

2. Category: IXb. Particle Code: Gyrokinetic

3. Responsible Physicist: S.E. Parker

4. Others involved in code development: W.W. Lee, R. Sydora (UCLA)

5. One line description: Radially local 3D toroidal fully nonlinear delta-f electrostatic gyrokinetic particle code using field-line-following coordinates.

6. Computer systems which code runs on: Cray C-90, Unix, NCAR, Xgraphics

7. Typical running time: Production run take 0.1-1 hours.

8. Approximate number of code lines: 5,000

9. Does this code read data files from another code? No

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 field-line-following 3D toroidal fully nonlinear delta-f code for studying electrostatic turbulence and transport. FT3D is radially local with the computational domain being a magnetic flux tube.

12. Similar codes to this code, and distinguishing differences: Very similar to the SS3D code except in toroidal field line following geometry. Similar to other field-line-following gyro-fluid gyrokinetic codes at PPPL, GA and LLNL. Code keeps variation in temperature and density gradients, which is important for determining the radial mode width. Uses Hamiltonian guiding center equations in Boozer coordinates.

13. Journal References describing code (up to 3): ``Comparisons of Gyrofluid and Gyrokinetic Simulations,'' S.E.~Parker, et al., Physics of Plasmas 1 1461 (1994). ``Gyrokinetic Simulations of Tokamak Turbulence,'' S.E.~Parker, et al., Joint Varenna-Lausanne Int. Workshop on Theory of Fusion Plasmas, Aug. 22-26, 1994, Proceedings published by Italiana di Fisica.

14. New code capabilities planned for next 1-2 years: improved electron dynamics, zero-electron inertia model for passing electrons, electromagnetic effects.

15. Code users: S. Parker, W. W. Lee, R. Sydora (UCLA)

16. Present and recent applications of code: ITG, trapped ion, trapped electron 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 1993, 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: Unix, Fortran, NCAR, Xgraphics

22. Results of inter-comparisons with other codes and results of validation against experiments. Active participation with NTP code comparisons. ``Comparisons of Gyrofluid and Gyrokinetic Simulations,'' S.E.~Parker, et al., Physics of Plasmas 1 1461 (1994).