# Presentation: 561438

## NSTX Research Forum

***Culham Sci Ctr***
***U St. Andrews***
***York U***
***Chubu U***
***Fukui U***
***Hiroshima U***
***Hyogo U***
***Kyoto U***
***Kyushu U***
***Kyushu Tokai U***
***NIFS***
***Niigata U***
***U Tokyo***
***JAERI***
***Hebrew U***
***Ioffe Inst***
***RRC Kurchatov Inst***
***TRINITI***
***KBSI***
***KAIST***
***ENEA, Frascati***
***CEA, Cadarache***
***IPP, Jülich***
***IPP, Garching***
***ASCR, Czech Rep***
***U Quebec***

***College W&M***
***Colorado Sch Mines***
***Columbia U***
***Comp-X***
***General Atomics***
***INEL***
***Johns Hopkins U***
***LANL***
***LLNL***
***Lodestar***
***MIT***
***Nova Photonics***
***New York U***
***Old Dominion U***
***ORNL***
***PPPL***
***PSI***
***Princeton U***
***SNL***
***Think Tank, Inc.***
***UC Davis***
***UC Irvine***
***UCLA***
***UCSD***
***U Colorado***
***U Maryland***
***U Rochester***
***U Washington***
***U Wisconsin***

**NSTX Research Forum**
**Edge Physics ET Group Break-out Session **
**Summary and Priorities for FY2007**

**Vlad Soukhanovskii, EP ETG Leader**
***Lawrence Livermore National Laboratory***
_**Henry Kugel**_**, EP ETG Deputy**
***Princeton Plasma Physics Laboratory***
**December  07, 2006, Princeton, NJ**

## The XP Review Was Guided by NSTX Program, ITPA, Joint Proposals, and ST Development Path Needs

**NSTX Milestones - Edge Research Milestone R(08-2) ****“*****Study edge/divertor at low plasma collisionality with ITER level heat fluxes”***
**ITPA Participation**
** ****Pedestal (PEP-6, PEP-9)**
** ****Divertor and SOL (DSOL-15, DSOL-17)**
** ****Diagnostics (DIAG-2)**
**ST development path, relevance to ST-CTF**
**Guidance from Run Coordinator: 5/10 run day allocations for contingency planning**

## 35 Proposals Received and Categorized into 7 Sub-Topical Edge Physics ETG Areas

- • **Recycling control with lithium coatings on walls (3)**
** ****ELM and pedestal physics, including scaling and stability (8)**
** ****Edge, SOL and divertor plasma transport and  turbulence (14)**
** ****Divertor studies, including heat flux reduction and detachment (2)**
** ****MARFE studies (2)**
** ****Fueling optimization (2)**
** ****Dust and Deposition (4)**
**TOTAL: 35 Proposals, 20.25 Run days requested**

## Edge Physics Proposal Presentations

- * Note: number of requested days **in red**

***Introduction***
**V. A. Soukhanovskii (LLNL)**
***Remote presentations***
**A. Hubbard (PSFC MIT)**
**Comparison of Small ELM Regimes in Alcator C-MOD, MAST, and NSTX  ****[1.0]**
**(ELMs & Pedestal)**
**J. R. Myra (Lodestar Research Corp.) ****[0]**
**SOL profile broadening by X-point cooling**
**(Edge T&T)**
**Z. Wang (LANL) ****[0]**
**XP for initial operation of HDI and imaging of hypervelocity dust**
**(Dust and Deposition)**

## MARFE studies and Edge Transport and Turbulence

***MARFE studies***
**K. Tritz (JHU****)**
**Hot electron component of the MARFE ****[0]**
**R. J. Maqueda (Nova Photonics)**
**MARFE-space in NSTX ****[1.0]**
***Edge Transport and Turbulence***
**R. J. Maqueda (Nova Photonics)**
**XP622: Edge turbulence and blobs during H-mode ****[1.0]**
**R. J. Maqueda (Nova Photonics)**
**Localized lower divertor puffs for GPI ****[1.0]**
**M. V. Umansky**
**Studies of turbulent transport of impurities in NSTX edge plasma ****[****0.50]**

## Edge Transport and Turbulence (cont.)

**J. Terry (MIT-PSFC) (R. Granetz)**
**Characterization of blobs/filaments on NSTX in support of ITPA research task DSOL-15 - Multi-Machine Scaling of Blob Characteristics ****[0]**
**S. J. Zweben (PPPL)**
**Electrode Biasing for SOL Control ****[1.0]**
**S. J. Zweben (PPPL)**
**Outer Gap Scan ****[1.0]**
**S. Ku (CIMS NYU) ****[0]**
**XGC code**
**K. Williams (PPPL)**
**Ohmic Density Scan ****[1.0]**

## Edge Transport and Turbulence (cont.)

**J. Boedo (UCSD)**
**Testing Theory on Blob transport-Blob velocity, Holes and Blob size, Intermittency in L-mode vs H-mode ****[1.0]**
**Reynolds Stress and Bi-Coherency ****[0.5]**
**Electromagnetic vs Electrostatic Transport ****[0.5]**
**SOL Scaling with Power, SOL Flow and Connection with Radial Transport ****[1.0]**

## ELMs & Pedestal

**R. Maingi (ORNL)**
**Dependence of Pedestal Structure on Aspect Ratio ****[0.5]**
**R. Maingi (ORNL)**
**Dependence of ELMs and Power Balance on Magnetic Balance and Fueling ****[1.0]**
**K. Tritz (JHU)**
**ELM Character vs. Collisionality XP ****[1.0]**
**K. Tritz (JHU)**
**ELMs and Generation of Impurities ****[0]**
**R. J. Maqueda (Nova Photonics****)**
**Multi-diagnostic ELM Characterization ****[1.0]**
**K.C. Lee (UCD)**
**Type V ELM Rotation and Toroidal Origin ****[1.0]**
**C. Bush (ORNL)**
**Characterization of Interaction of ELMs with NSTX Edge/Divertor using Fixed Langmuir Probes ****[1.0]**

## Lithium,  Dust, and Deposition Studies

***Lithium***
**D. Mansfield (PPPL)**
**Injection and Dispersion of Li powder for Improvement of H-Mode ****[0.25]**
**H. W. Kugel (PPPL)**
**Investigate Effect of Lithium on H-Mode Performance with LPI ****[2.0]**
**H. W. Kugel (PPPL)**
**Investigate Effect of Lithium-Coated Divertor on Plasma Performance with LITER-1d ****[1.0]**
***Dust and Deposition studies***
**C. H. Skinner (PPPL)**
**Deposition studies (piggyback) ****[0]**
**Dust detector studies ****[0]**
**Dust particle injection for benchmarking the DUSTT code ****[1.0]**

## Divertor and Fueling

***Divertor studies (Heat flux reduction and detachment)***
**V. A. Soukhanovskii (LLNL)**
**Modifications to NSTX Divertor Geometry ("NSTX issue card") ****[0]**
**Divertor Heat Flux Reduction and Detachment in CTF-relevant (High Performance Highly Shaped) Plasmas ****[1.0]**
***Fueling***
**V. A. Soukhanovskii (LLNL)**
**High-pressure Supersonic Gas Jet Fueling ****[0.5]**
**R. Raman (U Washington****)**
**CT Injector as a Tool for Near Term Enhancement of NSTX Plasma Operations and Development of an Advanced Fueling system for ITER and STs ****[0]**

## Other, and Post-deadline presentations and Prioritization Discussion

***Other topics or Post-deadline presentations***
**S. F. Paul (PPPL)**
**First Ion velocity Measurements Using the SWIFT diagnostic (Shifted Wavelength/lnterference Filter Technique) ****[0.5]**
***Prioritization of Proposed Experiments***
**      • ****Group discussion as follows:**

## Edge Physics ETG Break-out Session Discussion Procedure

**1. All XPs were presented. The XPs were grouped and presented by sub-topical categories to facilitate the prioritization process.**
**2. ****EP ETG Leader proposed run time allocation by sub-topical categories and this proposal was adjusted by the Group discussion. **
**3.  ****Candidate XPs were nominated by non-authors to a priority list. The priority list included 1) Top-tier XPs (5 run day scenario) 2) Second tier XPs (10 run day scenario) 3) Third tier (other)**
**4. ****Priorities and run time allocation were adjusted by reconciling lists from 2) and 3) through a group discussion. At this stage some XPs were combined.**
**5. ****A spreadsheet was made where each XP was assigned priority (top -1, medium - 2, other - 3).**

## Run Day Allocation by Sub-topical Edge Physics Category

**	****Divertor heat flux reduction - 1 day**
**	****Dust & Deposition Studies -  0.5 days**
**	****Edge T&T - 2.5 days**
**	****ELM & Pedestal - 2.5 days **
**	****Fueling optimization (SGI) - 0.5 day**
**	****Lithium experiments - 2.5 days**
**	****MARFE studies -  0.5 day**

## Top Priority Tier for 5 Run Days (not prioritized within tier)

**H. W. Kugel , D. Mansfield (PPPL) ****- 2.5 days**
**“****Investigate Effect of Lithium on H-Mode Performance with LPI”**
**“****Investigate Effect of Lithium-Coated Divertor on Plasma Performance with LITER-1d”**
**“****Injection and Dispersion of Lithium Powder for Improvement of H-Mode”**
**A. Hubbard (PSFC MIT) ****- 1 day**
**“****Comparison of Small ELM Regimes in Alcator C-MOD, MAST, and NSTX”**
**Leader TBD ****- 1 day**
**“****NHTX SOL Width Scaling”**
**R. Maingi (ORNL) ****- 0.5 day**
**“****Complete “Dependence of Pedestal Structure on Aspect Ratio”**

## Second Priority Tier for 10 Run Days (not prioritized within tier)

**J. Boedo (UCSD), R. Maqueda (Nova Photonics), J. L. Terry (PSFC MIT)**** ****- 1 day**
**“****Testing Theory on Blob transport-Blob velocity, Holes and Blob size, Intermittency... **
** “****Edge Turbulence and Blobs During H-mode”**
**“****Characterization of Blobs/filaments on NSTX in Support of ITPA Research Task DSOL-15 - Multi-Machine Scaling of Blob Characteristics”**
**V. A. Soukhanovskii (LLNL) ****-**** ****1 day**
**“****Divertor Heat Flux Reduction and Detachment in CTF-relevant Plasma” **
**S. Zweben (PPPL)**** ****-**** ****0.5 day**
**“****Electrode Biasing for SOL Control”**
**J. Boedo (UCSD), C. Bush (ORNL), K. C. Lee (UCD), R. Maqueda (Nova Photonics), K. Tritz (JHU)**** ****- 1 day**
**“****Characterization of Interaction of ELMs with NSTX Edge/Divertor using Fixed Langmuir Probes”**
**“****Type V ELM Rotation and Toroidal Origin”**
**“****Multi-diagnostic ELM Characterization”**
**“****ELM Character vs. Collisionality XP”**
**“****ELMs and Generation of Impurities****”**

## Second Priority Tier Continued (not prioritized within tier)

**C. Skinner (PPPL)**** ****- 0.5 day**
**Dust particle Injection for Benchmarking the DUSTT Code**
**R. Maqueda (Nova Photonics), K. Tritz (JHU)**** ****- 0.5 day**
**“****MARFE Space in NSTX”**
**“****Hot Electron Component of the MARFE”**
**V. A. Soukhanovskii (LLNL)**** ****- 0.5 day**
**“****High-pressure Supersonic Gas Jet Fueling (SGI-Upgrade)”**
**R. Maingi (ORNL)**** - ****0.5 day only if no time needed for tier 1 XP by R. Maingi**
**“****Dependence of ELMs and Power Balance on Magnetic Balance and Fueling”**

**• ****Third priority tier **
**	****- All experiments not in the first two tiers**