DIII-D Frontier Science Runtime• FES has funded an additional week of DIII-D operation in FY2017 andFY2018 for fundamental plasma science experiments• Goal: provide access to high-temperature (collisionless, high Lundquistnumber, etc) magnetized plasma for studying important processes
relevant to, e.g., space and astrophysical plasmas• Access to parameter regime and size not available in single-PI scale

devices or in intermediate scale user facilities (e.g. LAPD, Big Red Ball)• Hope to increase engagement with university programs; attract users

outside the traditional laboratory plasma physics/fusion community toFES facilities

FY17 & FY18 Experiment Selection Process• DIII-D FS Committee: Troy Carter (Chair FY18), Richard Buttery,Cary Forest, Greg Howes, Mark Koepke, Bill Heidbrink, Jan Egedal,Bill Daughton, John Sarff, George McKee, Don Spong, Carlos PazSoldan• First two years, committee reached out to the community &solicited proposals• Committee wanted to identify experiments that would address

important fundamental science topics but also were well alignedwith DIII-D capabilities and had a high likelihood of success•Submitted proposals were voted on by the committee and arecommendation for run time allocation was madeFY17 Selected Proposals• Self-organization of Unstable Flux Ropes - Universal
Structures in Space/Astrophysical Plasmas: Paolo
Piovesan (Consorzio RFX)•

Impact of Magnetic Perturbations on Turbulence –Zonal Flow Interactions and Saturation: John Sarff (U.
Wisconsin) (Invited Talk Zach Williams PI2, Wednesday
Afternoon)• Alfvén/Whistler Fluctuations and Runaway
Electrons: Don Spong (ORNL) (Invited 2017 DPP)

•Self-consistent Chaos in Magnetic Field Dynamics: F.
Skiff (Iowa)

FY18 Selected Proposals• EMIC waves in multi-ion DIII-D Plasmas: C. Kletzing(Iowa), S.Vincena (UCLA),W. Heidbrink (UCI) (G. Degrandchamp
has poster on this experiment: NP11.00120)•Alfvén/Whistler Fluctuations and RunawayElectrons: D. Spong (ORNL) (Poster from new data K. Gage
NP11.00118)• Generation of positrons in DIII-D P. Aleyinkov (IPP)
Reconnection
Physics
andTwoFluidMHD•
Tests Through Sawtooth Behavior: W. Fox (PPPL)Two DIII-D FS Experiments address physics important
to Earth’s Radiation Belts• Radiation belts: population of trapped, energetic
electrons (relativistic) and protons• Significant interest in fundamental physics

controlling these populations (processes thatlead to energization and scattering/loss); alsosignificant interest in controlling/remediatingthese populations•

Wave-particle interaction physics is key:
Whistler waves and Electromagnetic Ion
Cyclotron (EMIC) waves play important roles
in energizing and scattering radiation beltparticles

Two DIII-D FS Experiments address physics importantto Earth’s Radiation Belts

VIEW LETTERS 120, 155002 (2018)ay gamma. Whistlers
75 sec.

whistlerquence ofetic field,
to highereshold inay levels.
ed linear

Nonlinear feedback between
whistler waves and runaway
electron population in DIII-DFIG. 7. Time evolution of (a) 100–200 MHz magnetic fluctuation power spectra; (b) ECE intensity at 83.5, 92.5, 109.5,111.5, and 113.5 GHz. Dashed arrows in (b) are times at which
the ECE and whistler amplitudes peak; solid arrows in (a) aretimes at which whistler amplitudes drop. The gray shaded bars
are intervals of n ¼ 1 sawtooth activity.

Spong,al. PRL 120,155002that(2018)
laboratory
andetionosphericmeasurements
whistlers
induce pitch angle scattering of relativistic electrons [8,6].

EMIC waves in DIII-D: H/D/He3
plasmas, see AEs excited by NBI
ions in “upper band”

What’s Next? Possible Runtime in FY20
• Due to DIII-D LTO, no plan for FS runtime process for FY19
• FES may support runtime in FY20
• Question to the community: does it make sense to continue (what is thelevel of interest in this runtime (can potentially gauge by asking forproposals)) — should take stock of FY17, FY18 results• Need to move to open process (either proposal solicitation or open ROFlike process) for selection of run time