Alcator C-Mod 2005 Ideas Forum

 

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purpose | format | task force areas | title submission | capabilities

Purpose

The purpose of the Forum is to provide an opportunity for presentation of specific ideas appropriate for experiments during C-Mod's 2005 run campaign. As usual, the Forum will be open to all interested parties including current and potential future collaborators.

The focus of the CY 2005 run campaign will be experiments that utilize our new 3MW Lower Hybrid capability, but proposals in other topical areas may be submitted as well.

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 (.pdf, MSWord, or PowerPoint documents).

Please name each idea "Ideas05_your-last-name_first-two-words-in-ideas-title.ext", where "ext" is the appropriate extension (.pdf, .doc, or .ppt). Examples:

·       Ideas05_coppi_high-beta.ppt

·       Ideas05_murakami_lh-scaling.pdf

Local presenters should follow these instructions, while remote presenters should find instructions here. 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. 2003).

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
  2. Issues relevant to possible future burning plasma experiments

The five topical science areas are:

  1. Transport
  2. Lower Hybrid
  3. ICRF
  4. Divertor/Edge
  5. MHD
  6. Basic Science

Please indicate on your submission which area is most relevant to your idea.

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. A listing of the task forces for FY2005 and their coordinators can be found here.

Interested parties are encouraged to contact the appropriate coordinators prior to submitting their ideas 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 presentations from previous forums can be found here and here.

Title Submission

Titles for presentations should be sent via e-mail to IdeasForum@psfc.mit.edu; the deadline for title submissions is Wednesday, November 24, 2004. Please indicate the task force area from the list above which best corresponds to each idea. See the checklist to determine what is required for presentation.
 
 

Run Campaigns and Capabilities

At least 14 weeks of research operation are planned for the 2005 campaign. Plasma operation is scheduled to begin in early February 2005, following installation of the new lower hybrid system.

We do not currently have plans for an up-to-air during the campaign, but if needed the schedule allows for one after initian operation of the lower hybrid system.

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 here. The ideas listed there need not be re-proposed at the 2005 Ideas Forum.

A short summary of the expected machine capabilities/parameters/diagnostics for the 2005 campaign follows. For a more comprehensive view, please visit the C-Mod website or contact us.


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, 1.5 sec 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.

purpose | format | task force areas | title submission | capabilities