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FoSS: ISHW2024: Difference between revisions
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== Discussion == | == 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 [https://scied-web.pppl.gov/rgdx/ 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 | |||
=== 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 | |||