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Alcator C-Mod Ideas Forum

 
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The next Alcator C-Mod Ideas Forum will be held on September 10-12, 2003 at the MIT Plasma Fusion Center,
175 Albany Street
Cambridge, MA
Room NW17-218

PURPOSE

The purpose of the Forum is to provide an opportunity for presentation of specific ideas appropriate for experiments during C-Mod's 2002 run campaign. As usual, the Forum will be open to all interested parties, including current and potential future collaborators.

FORMAT

The format of the presentations will consist of a five-minute, no-more-than-three-slide, talk summarizing the basic idea and benefits of each proposed experiment, as well as its motivation, goals, and general plan of execution. All presentations must be in electronic form. They can be pdf, MSWord, or PowerPoint documents. Please name them "Ideas02_your-last-name_first-two-words-in-ideas-title.ext", where "ext" is the appropriate extension (.pdf, .doc, or .ppt). Local presenters should follow instructions at local submission link, while remote presenters should find instructions at the remote submission link. We will link all presentations on the Forum Agenda page, so that, upon presentation, you or the moderator can easily call up the document from the Agenda page. Individuals may present as many ideas on separate topics as they wish, but each presentation should be self-contained and limited to five minutes. Brief, constructive, group discussion will follow each presentation; the discussion should focus on clarification, not detailed critiques. Click here for examples of presentations made at the last Forum (Dec. 2001).


TASK FORCE AREAS

This year the Forum is organized around two "focus" areas and five topical science areas. We solicit Ideas within those areas. The two focus areas are 1) issues relevant to quasi-steady-state Advanced Tokamak (AT) plasmas, and 2) issues relevant to possible future burning plasma experiments.  The five topical science areas are Transport, RF Physics, Divertor/Edge Physics, MHD, and Basic Science. After reading the descriptions below, we ask that you choose that area most relevant to your Idea and indicate that in your submission. A task force will be assembled to organize and prioritize the proposals/ideas in each of the seven areas. Initial run time allocations will be based upon the task force prioritization. The task force coordinators for this FY2004 Forum are:
 
Area
Coordinator
e-mail address
Area description
AT experiments Steve Scott
(PPPL)
sscott
@psfc.mit.edu
AT issues include, but are not limited to:  Formation and control of internal transport barriers, RF Flow drive, density control, current profile modification, current profile measurement, long (~3 sec) discharges, and exploring target plasmas suitable for LHCD, commissioning of the 3MW LH launcher, preliminary LHCD experiments.
Burning plasma-relevant exps. Steve
Wolfe
wolfe
@psfc.mit.edu
Includes issues that are critical to producing a burning plasma in a tokamak, e.g., confinement optimization in limiter and divertor configurations, scaling experiments, density limits and profile control.
Transport Dmitri
Mossessian
mossessian
@psfc.mit.edu
The transport program includes studies of edge fluctuations and stability including EDA and ELMy H-modes and the role of turbulent transport in the density limit; the L/H threshold and transition dynamics; the role of critical gradients and marginal stability in core transport; ITB thresholds, dynamics, sustainment and control; and the origin and role of rotation in systems without direct momentum sources.
RF physics Steve
Wukitch
wukitch@
psfc.mit.edu
RF issues include, but are not limited to wave propagation and absorption, mode conversion, directed waves and current drive, wave-particle interactions per se and those that provoke a unique plasma response (e.g. ITB's), and antenna behavior.
Divertor /Edge physics Brian
Labombard
labombard
@psfc.mit.edu
The divertor/edge program includes: studies of main chamber and divertor recycling, SOL transport, turbulence, and scalings, divertor power handling, plasma/surface interactions and impurity generation, the physics of detachment, volume recombination processes, opacity, and modeling of the divertor and edge.
MHD physics Bob
Granetz
granetz
@psfc.mit.edu
The MHD research program includes: study of stability properties of the H-mode pedestal; beta-limiting MHD in high-performance H-mode and ITB discharges; disruption physics, including mitigation and avoidance techniques; Alfven eigenmodes driven by ICRF-generated tail ions; and shape optimization and control studies in support of the major research themes. Studies of the quasi-coherent (QC) mode relate directly to issues of turbulence and transport. Active MHD spectroscopy and possible control of core and edge modes.
Basic Science Bill
Rowan
(U. Texas)
w.l.rowan
@mail.utexas.edu


The Basic Science area includes atomic phyiscs and astrophysics-relevant studies that utilize the plasma as a well diagnosed, hot light source.

Interested parties are encouraged to contact the appropriate coordinators prior to submitting their ideas, in order to avoid duplication and to facilitate a coherent approach. Presentation of ideas about new diagnostics and/or analysis methods is also encouraged for this Forum. Examples of Ideas presented at the last (2002) Ideas Forum may be found at http://www.psfc.mit.edu/people/terry/Forum_agenda.html.

TITLE SUBMISSION --- IMPORTANT

Titles for presentations should be sent by e-mail to Valerie Censabella (censabella@psfc.mit.edu); the deadline for title submissions is Wednesday, Sept. 3, 2003. Please include the words "C-Mod Forum" in the subject field, and, where applicable, indicate the task force area from the list above which best corresponds to each idea. See http://www.psfc.mit.edu/people/terry/Ideas_Forum_2003/Ideas_forum.html for a full checklist of what is required for presentation.An agenda will be published prior to the Forum.
 
 

RUN CAMPAIGN AND CAPABILITIES

Between 18 and 21 weeks of research operation are planned (depending upon final FY04 funding) for the 2004 campaign. Operation is presently scheduled to begin in early October, 2003. The first phase of the campaign will run through mid-December 2003. There will then be a break for installation of the first of two Lower Hybrid Wave Launchers. The research phase of the second part of the campaign is scheduled to begin in April, 2004. Please be aware that there are exisiting, already-approved experimental proposals that will "compete" for run time on an equal basis with the new ones from the Forum. These exisiting proposals/ideas can be examined at http://www.psfc.mit.edu/people/wolfe/cmod/experiments_fy03.html .The ideas listed there need not be re-proposed at the 2004 Ideas Forum.

A short summary of the expected machine capabilities/parameters/diagnostics for the 2004 campaign follows. For a more comprehensive view, please visit the C-Mod website (www.psfc.mit.edu/cmod) or contact Jim Terry (terry@psfc.mit.edu).

Facility Improvements that have occurred after 2002:  
- Modification of inner divertor, allowing plasma currents up to 2 MA and triangularities up to ~0.75.
- ICRF heating systems improved, allowing for routine heating powers of up to 5 MW (variable frequency between 40 and 78MHz with capability of heating or current drive phasing)
- Diagnostic Neutral Beam (H2 or D2, 50 kV, 5 A source, 50 ms duration)
- Installation of seven external coils (A-coils) for non-axisymmetric field studies and locked mode amelioration
.

Facility Improvements scheduled to be in place by the end of CY2004:
- Lower Hybrid Wave Launcher with source power up to 3 MW

- Long-pulse (up to 1.5 sec) Diagnostic Neutral Beam
- CXRS (Charge Exchange Recombination Spectroscopy)
- MSE (current profile measurement via the Motional Stark Effect)
- Prototype Tungsten-Brush tile in divertor

- Real-time ICRF tuning
- Cyropump in upper divertor.


C-Mod Parameters
- Bt from ~3 T to 8 T
- Ip up to 2 MA
- central ne up to ~1x1021 m-3
- Ti~Te up to ~5 keV
- elongation from 0.9 to 1.7
- triangularity from ~0.3 to 0.75
- lower single null or double null or limited configuration 

Auxiliary Plasma Heating/Current Drive Capabilities:
- ICRF ~5 MW in plasma
- LHCD ~2 MW in plasma for phase 2 of 2004
campaign

Selected Diagnostics
Te(r) via Thomson Scattering and ECE,
ne(r) via visible bremsstrahlung, Thomson Scattering, and interferometry,
core toroidal rotation measurements via spectroscopy,
core Ti profile measurements via spectroscopy and neutron emission,
standard magnetic diagnostics,
density fluctuation measurements via Phase Contrast Imaging, microwave reflectometry,
impurity measurements via spectroscopy (x-ray, VUV, visible),
core and edge bolometry,
edge and SOL profiles via reciprocating probes
SOL fluctuation measurements via probes and light emission,
Li/impurity pellet injection,
impurity gas puff system.