该研究详细介绍了在德III-D等离子体中，通过不同位置和不同H模条件注入氘燃料丸触发ELMs（边缘局部模式）的实验。即使在由共振磁场扰动抑制ELMs的条件下，燃料丸也能引发ELM样事件。实验发现，ELMs在燃料丸到达H模基座之前就被触发，表明浅穿透的小型燃料丸足以触发ELMs。为进行ELM定时研究，已在德III-D上安装了燃料丸滴落器，并初步展示了1毫米燃料丸以10米/秒速度进入边缘等离子体时的强环向偏转。将进一步讨论提高穿透性和ELM触发的方法。
50th Annual Meeting of the Division of Plasma Physics
Volume 53, Number 14
Monday–Friday, November 17–21, 2008;
Dallas, Texas
Session JP6: Poster Session IV: Education and Outreach; Undergraduate and High School Research; DIII-D I; HBT-EP and Other Tokamaks; Short-Pulse Laser-Matter Interactions and Equations of State for HEDP
Tuesday, November 18, 2008
Room: Marsalis A/B, 2:00pm - 5:00pm
Abstract ID: BAPS.2008.DPP.JP6.77
Abstract: JP6.00077 : ELMs Triggered From Deuterium Pellets Injected into DIII-D*
Authors:
L.R. Baylor
T.C. Jernigan
N. Commaux
S.K. Combs
(Oak Ridge National Laboratory)
T.E. Evans
P.B. Parks
(General Atomics)
M.E. Fenstermacher
(Lawrence Livermore National Laboratory)
R.A. Moyer
J.H. Yu
(University of California-San Diego)
Fueling pellets have been injected into DIII-D plasmas from 5
different locations and under different plasma H-mode conditions.
ELMs have been triggered from pellets injected from all locations
and under all the H-mode scenarios. Pellets injected into plasmas
with ELMs suppressed by a resonant magnetic perturbation have
also been observed to trigger one or more small ELM like events.
Experimental details of the pellet triggering of ELMs show that
they are triggered before the fueling pellets reach the top of
the H-mode pedestal, implying that small shallow penetrating
pellets are sufficient to trigger ELMs. To test this idea a
pellet dropper has been installed on DIII-D for ELM pacing
studies. Initial results from 1mm pellets dropped at 10 m/s into
the edge plasma show a strong toroidal deflection. Details of the
pellet penetration results from the dropper will be presented and
plans to improve the penetration and resulting ELM triggering
will be discussed.
*Supported by the US DOE under DE-AC05-00OR22725, DE-AC52-07NA27344 and DE-AC03-99ER54463.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DPP.JP6.77
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