1. Code Name: NOVA-R

2. Category: VIIb. Linear Stability: 2D Resistive MHD

3. Responsible Physicist: C. Z. Cheng

4. Others involved in code development: T. Harley, S. Jardin

5. One line description: Resistive MHD stability code for tokamaks.

6. Computer systems which code runs on: Cray

7. Typical running time: 30 minutes/Cray time

8. Approximate number of code lines: 10,000 lines

9. Does this code read data files from another code? It reads equilibrium data from equilibrium code.

10. Does this code produce data files that can be read by another code? yes, Its output data can be read by other code to study plasma transport due to tearing modes in tokamaks.

11. 1-2 paragraph description of code: The NOVA-R code computes the frequency and growth rate of resistive MHD modes for tokamaks with noncircular flux surfaces and finite plasma beta. The NOVA-R formulation can accurately resolve the continuum spectrum of the ideal MHD operator and thus provide very accurate eigensolutions for very small resistivity.

12. Similar codes to this code, and distinguishing differences: None.

13. Journal References describing code (up to 3): T. R. Harley, C. Z. Cheng, S. C. Jardin, J. Comput. Phys., 103, 43-62 (1992)

14. New code capabilities planned for next 1-2 years: Effects of resistive walls or conductors and feedback circuits on the stability of resistive tearing modes.

15. Code users: T. Harley, C. Z. Cheng

16. Present and recent applications of code: Tearing modes in tokamaks.

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

18. Year Code was first used and present frequency of use: 1991. It is not used frequently.

19. Estimate of Man-Years invested in developing code: 3 man years.

20. Catagories 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 moddelling ( ) code for machine design

21. Language code is writen in: Fortran

22. Results of intercomparisons with other codes and results of validation against experiments. Results have been compared accurately with other linear resistive stability codes for cylindrical geometry as well as with analytical asymptotic matching theory. No comparison with experiments has been made.