U.S. Disruption Mitigation Workshop
Agenda, version 1.0 (TENTATIVE!)
All sessions in GA room 15-019 unless otherwise noted
Please come early the first day if you do not have a GA badge. We expect there may be delays at the
Visitor Reception Center.
See below for descriptions of the discussion sessions
Monday morning, March 12
| 9:00 | M.R. Wade | Welcome to GA
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| 9:05 | C.M. Greenfield | Purpose of Workshop
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| 9:25 | N. Sauthoff | US ITER perspective on DMS
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| 9:45 | S. Putvinski | Physics Requirements for ITER Disruption Mitigation System
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| 10:15 | S. Maruyama | ITER Fueling System Overview and DMS Work Scope
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| 10:30 | Break
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| 10:45 | M. Glugla | ITER Fuel Cycle Implications for DMS
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| 11:00 | A. Vergara Fernandez | ITER Plasma Stop Scenarios
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| 11:20 | D. Rasmussen | DMS System Planning and Timeline
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| 11:40 | L. Baylor | DMS Technology History
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| 12:00 | Lunch
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Monday afternoon, March 12
| 1:00 | Discussion session 1 | ITER environmental concerns
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| 3:00 | Break
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| DIII-D Disruption Mitigation Experiment and Plans
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| 3:15 | E. Hollmann | Overview of DIII-D Rapid Shutdown Experiments
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| 3:35 | N. Commaux | DIII-D Disruption Mitigation Hardware
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| 3:55 | N. Eidietis | Runaway Electron Control Issues
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| 4:15 | V. Izzo | Disruption Mitigation Modeling Work
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| 4:35 | J. Wesley | Overview of Desired Experiments
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| 6:00 | Reception in GA Cafeteria
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Tuesday morning, March 13
| 8:30 | G. Pautasso (remote) | AUG Disruption Mitigation Experiments and Plans
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| 8:50 | F. Saint Laurent (remote) | Tore Supra Disruption Mitigation Experiments and Plans
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| 9:10 | B. Granetz | Results from initial Disruption Mitigation Expeirments with Two Gas Jets on Alcator C-Mod
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| 9:40 | M. Lehnen | Massive Gas Injection - Valve Development and Application Towards ITER
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| 10:10 | Break
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| 10:25 | Discussion session 2 | Thermal Quench Mitigation
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| 12:25 | Lunch
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Tuesday afternoon, March 13
| 1:25 | S. Gerhardt | Physics Based Disruption Detection in NSTX
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| 1:40 | R. Raman | Disruption Mitigation Plans on NSTX
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| 1:55 | N. Bogatu | Plasma Jets for Runaway Electron Beam Suppression
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| 2:10 | G. Wurden | Reactive Armor for ITER DMS
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| 2:25 | Discussion session 3 | Runaway Electron Suppression
(includes 15 minute break)
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| 4:50 | Open discussion and workshop wrapup
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Description of discussion sessions
There will be three discussion sessions, each with a main topic and a series of questions for discussion.
The process will be described during the workshop, but in brief:
- Address questions with oral responses and discussion
- Free brainstorming of ideas to address underlined questions
- Post all ideas
- Consolidate postings of similar techniques and technologies into categories
- Discuss the details, improvements and ways to implement the ideas in each category
- Use dot voting to do an initial ranking of ideas
The results will be summarized at the end of the workshop. Note that we may break up into smaller groups for discussion
sessions 2 and 3 depending on how the first session goes (do we feel we could get more done in smaller groups)? If we do that,
remote participation will be available in each breakout room.
Discussion session 1: ITER environmental considerations
- What is the local environment at DM and RES port locations?
- What actuator and other technology can be used there?
- What measurements and sensors need to be incorporated in the port plug equipment list?
- What technologies and sensors can be reliably operated and maintained (RAMI)?
- What are the constraints on the ITER control system from disruptions and disruption mitigation?
- How well can the control system capture and control the RE beam?
- What is the downstream impact on the ITER fuel cycle (pumps, tritium recovery, hydrogenic inventory)?
- How close does the "injector" front end need to be to the first wall? How close is close enough?
- How far away is the RE beam from the "injector" (inner wall?)? Can the injected material cross the gap and remain effective?
- What diagnostics are needed in other port locations to monitor and control the DM and RES?
- What new concern or information about the environmental constraints do you want to contribute?
- What actuator, sensor and control devices do you propose that are compatible with this environment?
Discussion session 2: Thermal Quench Mitigation
- How do we avoid or delay disruption events?
- How do we effectively mitigate the forces from induced currents and halo current?
- How do we mitigate the thermal impacts on the PFCs?
- What is the efficacy of the present and proposed DM techniques, external controls and injection material candidates? (time and space)
- How much symmetry in the quench is required? Why? How many ports does that require?
- How do we improve our ability to predict disruptions and detect disruption precursors?
- What diagnostics are needed in other port locations to monitor and control the DM thermal quench?
- What new DM concern do you want to put on the table?
- What DM techniques, technologies and diagnostics do you propose?
Discussion session 3: Runaway Electron Suppression
- Avoid:
- How do we avoid runaway creation?
- What do you propose that can prevent RE creation?
- Suppress:
- How can we suppress the seed current?
- How can we reduce the drive (loop voltage)?
- How can we reduce the avalanche? How do we determine whether the Rosenbluth criteria is the right goal or approach?
- What do you propose that can suppress RE?
- Control:
- What control is needed for the RE beam?
- Can the ITER system provide it?
- What diagnostics are needed in other port locations to monitor and control the DM?
- What do you propose that could improve the control?
- Dissipate:
- What conditions enhance dissipation?
- What techniques can controllably (slowly) dissipate the beam?
- What do you propose that can enhance the dissipation?
- What new RES concern do you want to put on the table?
- What RES techniques, technologies and diagnostics do you propose?
Wrapup discussion
- What is a timely technical development and experimental plan that will answer the critical questions and
narrow the focus to a limited set of techniques and technologies?
- How do we down select to the specific requirements and hardware that needs to be provided to ITER in
time for installation and commissioning?
- How do we more effectively involve the broad set of resources (machines, experimentalists, technologists,
scenario modelers, fabricators) needed?