FoSS: ISHW2024: Difference between revisions

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The 1st meeting of the Forum of Small Stellarators (1st Uncoordinated Working Group Meeting) took place as a satellite meeting to the 24th ISHW in Hiroshima, Japan on 12 September, 2024.  
The 1st meeting of the [[Forum of Small Stellarators]] (1st Uncoordinated Working Group Meeting) took place as a satellite meeting to the 24th ISHW in Hiroshima, Japan on 12 September, 2024.  


== Agenda ==
== Agenda ==
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*** if also standardized, could have a common web interface for multiple devices (proposed by Y. Suzuki)
*** if also standardized, could have a common web interface for multiple devices (proposed by Y. Suzuki)
*** suggest a workshop or bootcamp for development of the interface
*** suggest a workshop or bootcamp for development of the interface
* any workshop by the Forum should probably have a strong education aspect


=== configuration design / physics investigations ===
=== configuration design / physics investigations ===

Latest revision as of 14:37, 29 October 2024

The 1st meeting of the Forum of Small Stellarators (1st Uncoordinated Working Group Meeting) took place as a satellite meeting to the 24th ISHW in Hiroshima, Japan on 12 September, 2024.

Agenda

  • Welcome and introduction
  • ~ 1.5 hours for group introduction presentations. These should be 2-3 slide, <5 minute presentations that provide a brief project overview and any particular strategies to being relevant although small. Each will be followed by 5 minutes of questions / discussion.
    • STAR_Lite, Hampton University
    • Polaris, École Polytechnique Fédérale de Lausanne
    • CSX, Columbia University
    • ETOS, University of Wisconsin-Madison
    • TJ-K, Universität Stuttgart
    • ALPES, Technische Universität Graz
    • University of Science and Technology of China
    • EPOS, Max-Planck-Institut für Plasmaphysik, Garching
    • HU-Heliac, Hiroshima University
    • MUSE, Princeton Plasma Physics Laboratory
    • Renaissance Fusion
    • Heliotron-DR, Kyoto University
  • ~ 30 minutes for a coffee break. Opportunity for continuing discussions and engineering questions that are not of general interest.
  • ~ 1 hour for brainstorming small stellarator physics investigations and possible joint experiments.

Discussion

training

  • training students is a very important and common motivation
  • as part of coursework, project management and teamwork can also be trained
  • with so many small devices, we should consider collaboration as an important aspect of training
  • interest in an arduino-mentality stellarator kit (proposed by F. Volpe)
    • standardize a kit to make startup easy, but allow for flexibility
    • would be good for exporting stellarators to places with a limited budget, engineering groups without the physics support
  • related motivation: outreach
    • can we develop some interesting experiments/experiences ?
    • moving coils around ? moving a permanent magnet around ?
    • something like RGDX at PPPL ?
      • web-browser-based control system, providing an experiment remotely
      • if also standardized, could have a common web interface for multiple devices (proposed by Y. Suzuki)
      • suggest a workshop or bootcamp for development of the interface
  • any workshop by the Forum should probably have a strong education aspect

configuration design / physics investigations

  • small devices are test bed for integrated design, single-stage optimization
  • configuration exploration ? QA, QH, QP, QI, tokamak, RFP ?
    • benefits of some good configurations are not trivial to demonstrate at small size when collisionally dominated
    • can look at electrons at low pressure, demonstrate drift effects
  • turbulence studies, zonal flows
    • don't need a big machine, just a big gradient. Columbia had a 10cm linear device doing ITG studies. They had the advantage of open field lines. What are stellarator options to create a large gradient ?
    • see validation work at TJ-K. also turbulence work at TORPEX.
    • small devices are often studying interchange turbulence. interactions of interchange with energetic particles could be interesting.
    • also should look at validation of fluid turbulence codes
  • fast particle transport, if can inject dimensionally correct electrons ?
  • validate neoclassical flow damping
  • explore boundaries of MHD stability
  • what is the value of long discharges in small devices ?
  • the renormalization parameter in ISS04 hides the physics of deviation from the trend. a greater variety of devices in the database, even at lower performance, could provide this missing information.
  • small devices are challenged by background neutral gas. can we make this an advantage ? some sort of plasma-neutral interaction study ? atomic physics ?
    • but we don't need a stellarator to study the atom

diagnostics

  • variety of diagnostics already being used on small stellarators, some of which are also suitable for fusion plasmas
    • field line mapping common to all devices
    • probe access is particularly good on small devices
    • spectrometers
    • magnetic diagnostics
    • imaging
  • what is the typical budget for diagnostics ?
    • wide range, but often zero. they are secondary to an operating device
  • consider shared diagnostics ?
    • we are happy to get old diagnostics from other machines !
    • sharing diagnostics often comes with a lot of paperwork. its not easy to share a fast camera or oscilloscope. but sharing a probe head is easy.
    • you need a human to operate diagnostics. it is a natural area for people exchange
    • simplest way to get started is to share information. start with sharing how to make diagnostics and how to analyze.
    • Forum activity could be to create diagnostic kits. include information, part list, instructions for assembly, tools for analysis. then share people for expertise.
  • what is used for data management at small devices ? MDSplus ?
    • often use custom format, manual data management
    • may be an area for collaboration. standardized data access would facilitate cross-machine comparisons

plasma generation

  • can be expensive, but often determines physics capability of device
  • radio frequency: can be used for microwave studies, mode conversion, current drive, generation of high-energy electrons ?
  • helicon
  • electric discharge ?
  • MUSE puts a tesla coil outside the vessel, a fun method for outreach physics experiments with a glass vessel
  • consider non-neutral plasma, easy to generate