Choosing Preliminary Strawmen, Utilizing VASST, and Documenting Systems Code

1. Choosing Preliminary Strawmen,Utilizing VASST, and Documenting Systems Code Lane Carlson, Charles Kessel Mark Tillack, Farrokh Najmabadi ARIES-Pathways Project Meeting Bethesda, MD Oct 25-26, 2010

2. Preliminary strawmen for two cornershave been defined • Two strawmen chosen for SiC, aggr & cons physics. • Aggr => Bn ~ 0.045 Cons => Bn ~ 0.03 • VASST GUI has visually shown effect of filtering data and identification of points. • Working on cleaning up formatting of the code and internal commenting/documentation. • Verifying internal algorithms, hardwired numbers, power fractions, comments to code. • Updating external “public” documentation and keeping it up to date.

3. Systems code scanning parameters used to find the strawmen: • Coarse 4-corner scans have helped define these scanning parameters. • Output is a few million points

4. Preliminary filtering * Systems code accounts only for nominal heat, not transients. Set Qdivpeak < 7.5 MW/m^2 so as not to use up heat flux capability to handle nominal heat load.

5. Hardwired systems code parameters NOTE: • Changed SiC blanket divertor to He-cooling since heat flux was routinely > 5 MW/m^2 and liquid-metal cannot provide adequate cooling. • Pumping power is computed from R. Raffray’s correlations (2 - 6.8% for SiC WITH He-cooling) and these are multiplied by thermal power.

6. Preliminary strawmen for aggressive technology (SiC) corners * All costing is 2010$ ** H98 is based on total power including radiation

7. More details of preliminary strawmen for aggressive technology (SiC) corners Detailed files downloadable at: http://aries.ucsd.edu/ARIES/WDOCS/system.shtml Note: All costing is 2010$

8. Radial builds from systems code 1 Aggr tech, aggr physics 2 Aggr tech, cons physics R = 5.5 m R = 6.5 m

9. Fast database filtering: 25k pts/sec (Visual ARIES Systems Scanning Tool) new VASST GUI v.2 Number of points in database Auto-labeling Blanket database used Pull-down menus for common parameters Color bar scale Constraint parameter can restrict database Correlation coefficient Save plot Populate table with click Turn on ARIES-AT point design for reference Edit plotting properties

10. R vs COE, CC Kappa Database name: SysoutFinalsiccomb3 (aggr phys & aggr/cons tech) Filters: Bt 6-18 T div (in, out) < 7.5 MW/m2 Pnelec = 1000 ± 15 MW COE real n/nGr < 1 H98 < 1.9

11. Bn vs B, CC Kappa Database name: SysoutFinalsiccomb3 (aggr phys & aggr/cons tech) Filters: Bt 6-18 T div (in, out) < 7.5 MW/m2 Pnelec = 1000 ± 15 MW COE real n/nGr < 1 H98 < 1.9 BT increases as physics is relaxed (reducing Bn)

12. Bn vs COE, CC Kappa Database name: SysoutFinalsiccomb3 (aggr phys & aggr/cons tech) Filters: Bt 6-18 T div (in, out) < 7.5 MW/m2 Pnelec = 1000 ± 15 MW COE real n/nGr < 1 H98 < 1.9 Coarse and fine scans can be observed

13. BetaN vs COE, CC hfactor Database name: SysoutFinalsiccomb3 (aggr phys & aggr/cons tech) Filters: Bt 6-18 T div (in, out) < 7.5 MW/m2 Pnelec = 1000 ± 15 MW COE real n/nGr < 1 All H98 shown

14. BetaN vs COE, CC hfactor Database name: SysoutFinalsiccomb3 (aggr phys & aggr/cons tech) Filters: Bt 6-18 T div (in, out) < 7.5 MW/m2 Pnelec = 1000 ± 15 MW COE real n/nGr < 1 H98 < 1.9 Cons physics Filtered H98 < 1.9 Aggr physics

15. H98 vs COE, CC kappa Database name: SysoutFinalsiccomb3 (aggr phys & aggr/cons tech) Filters: Bt 6-18 T div (in, out) < 7.5 MW/m2 Pnelec = 1000 ± 15 MW COE real n/nGr < 1 Cons physics Aggr physics

16. R vs Qdivoutb, CC COE Database name: SysoutFinalsiccomb3 (aggr phys & aggr/cons tech) Filters: Bt 6-18 T div (in, out) < 7.5 MW/m2 Pnelec = 1000 ± 15 MW COE real n/nGr < 1 H98 < 1.9 • Heat flux on divertor was arbitrarily limited to 7.5 MW/m^2 to accommodate possible transients. • Need actual transient scenario to design divertor to be able to accommodate more realistically.

17. The database chronicle continues to grow as resolution is added • What input parameters were scanned? • What version of the systems code was used? Changes to code? (SVN control) • What blanket was implemented? • What were the assumptions applied in the code? Year$? • What filters were implemented to attain the points of interest? New data points since last meeting

18. Background check on systems code • Specifics of code are under investigation and are being scrutinized. • Internal documentation/commenting is poor. • “ASC documents” need to be thoroughly compared to code. Do the docs and code match? We are finding errors and omissions. • What exactly is in the different blanket modules? What assumptions and approximations are used? • Documentation within code plus external documentation must be kept up-to-date! Adhere to SVN after overhaul. Work to do: • There are slight errors in the code we would like to fix and updates to power flow model (Tillack to discuss) - then will issue refined strawmen. • Would like to remove tables and find better ways to express data. • Need to verify that algorithms, hardwired numbers, power fractions are correct. • DCLL low pumping power efficiency example.

19. Flow of calculations.doc

20. Summary • Preliminary strawmen given for SiC blanket, aggressive and conservative physics. • Continuing chronicle and documentation of systems code. • Details of VASST GUI to be presented at upcoming TOFE.

21. Future work • Would like comments back on preliminary strawmen. • What areas should we improve, filter, scan finer, etc. • Will thoroughly analyze code and correct errors. • Will thicken database in relevant areas around strawmen. • Provide final strawmen at four corners after ASC overhaul.

22. Extra Slides

23. ARIES systems code consists of modular building blocks • Systems code integrates physics, engineering, design, and costing. Systems Code Analysis Flow 1. PHYSICS Plasmas that satisfy power and particle balance 2. ENGINEERING FILTERS APPLIED 3. ENGINEERING & COSTING DETAILS Power core, power flow, magnets, costing, COE Filters include: Modules include: Toroidal magnetic fields Heat flux to divertor Neutron wall load Net electric power Blankets Geometry Magnets Power flow Costing DCLL SiC ARIES-AT