# Presentation: 264494

## Fueling Technology Development

**D.A. Rasmussen, L.R. Baylor, S. K. Combs, C. Foust****Oak Ridge National Laboratory**
**VLT Meeting**
**Washington DC**
**August 25, 2005**

## Key R&D Thrusts over next 5 years for Fueling Technology - develop reliable, plasma fueling, ELM & disruption mitigation systems

- _High throughput_, high reliability, extruders, accelerators and cooling systems -1000X increase in pellet fueling requirements (10X mass flow, 100X pulse length)
- _Deep pellet fueling_ for burning plasmas - provide central fueling despite high temperature edge pedestals.
- _ELM mitigation_ for edge plasma control - reduce PFC erosion and simplify plasma heating and control systems.
- _Disruption mitigation_ - dramatically reduce engineering requirements on tokamak and auxillary systems.
- _Fueling and transport analysis tools_ - enabling technology for alternates and detailed transport studies.

## Descriptions of R&D thrusts

**High throughput: Develop high rep rate injector (centrifuge, gas gun). Develop and evaluate high mass flow, continuous extrusion and cryocooler technologies. (ITER tasks 18-01,03) **
**Deep pellet fueling for burning plasmas: Characterize and optimize inner wall guide tube launch (ITER task 18-01).  Test high speed compact two-state gas gun injector (Ignitor). Benchmark ablation models and develop fueling scenarios (DIIII-D, JET)**
**ELM mitigation: Develop high rep rate pellet systems for ELM control and mitigation (DIII-D, JET).**
**Disruption mitigation: Develop and test fast gas valves (DIII-D, ITER). Develop high mass flow injection (liquid jet, etc). (ITER)**
**Fueling and transport analysis tools: Development of compact flexible pellet injectors for alternates (MST, LTX), pellet plasma diagnostics (MST, DIII-D, JET) and fuel deposition models.**

## Current Spending on R&D Thrusts

**High throughput: 410 K**
**Deep fueling: 312 K**
**ELM mitigation : 75 K**
**Disruption mitigation: 75 K**
**Fueling & transport analysis tools: 70 K **
**	****Collaborations allow effective deployment of new technology and benchmarking of design and analysis tools.**
**Experimental and diagnostic support from DIII-D, MST, and international collaborations**
**Predictive code and analysis support from theory**

**High rep rate ELM mitigation pellet dropper  for DIII-D**

## FY06 Spending on R&D Thrusts

**High throughput: 420 K**
**Deep fueling: 330 K**
**ELM mitigation : 75 K**
**Disruption mitigation: 75 K**
**Fueling and transport analysis tools: 70 K **
**Experimental and diagnostic support from DIII-D, MST, and international collaborations **
**Predictive codes, modeling and analysis support from theory**
**ITER specific R&D**

## Characterization of R&D thrusts to VLT missions

|  | ITER Base machine | R&D needed for ITER to be successful | ITER as test bed (TBM, etc) | Next generation technology (for current and future machines) | Longer Term R&D |
| --- | --- | --- | --- | --- | --- |
| High Throughput | x | x | xx | xx | xx |
| Deep pellet fueling | x | x | x | x | xx |
| ELM mitigation | x | x | x | x | x |
| Disruption mitigation | ? | x | x | xx | xx |
| Fueling enabling technology and transport analysis tools |  |  | x | x | x |