Abstract
This article is the first design study of a combined interferometer and polarimeter on a compact, high-field, high-density, net-energy tokamak. Recent advances in superconducting technology have made possible designs for compact, high magnetic field fusion power plants, such as ARC [Sorbom et al., Fusion Eng. Des. 100, 378 (2015)], and experiments, such as SPARC [Greenwald et al., PSFC Report No. RR-18-2 (2018)]. These new designs create both challenges and opportunities for plasma diagnostics. The diagnostic proposed in this work, called InterPol, takes advantage of unique opportunities provided by high magnetic field and density to measure both line-averaged density and poloidal magnetic field with a single set of CO2 and quantum cascade lasers. These measurements will be used for fast density feedback control, constraint of density and safety factor profiles, and density fluctuation measurements. Synthetic diagnostic testing using a model machine geometry, called MQ1 (Mission Q ≥ 1), and profiles simulated with Tokamak Simulation Code indicate that InterPol will be able to measure steady state density and poloidal magnetic field, as well as fluctuations caused by toroidal Alfvén eigenmodes and other phenomena on a high-field compact tokamak.
Highlights
Next-generation fusion experiments will investigate ways to reduce the size, cost, and complexity of an eventual fusion power plant
The diagnostic proposed in this work, called InterPol, takes advantage of unique opportunities provided by high magnetic field and density to measure both line-averaged density and poloidal magnetic field with a single set of CO2 and quantum cascade lasers
Synthetic diagnostic testing using a model machine geometry, called MQ1 (Mission Q ! 1), and profiles simulated with Tokamak Simulation Code indicate that InterPol will be able to measure steady state density and poloidal magnetic field, as well as fluctuations caused by toroidal Alfven eigenmodes and other phenomena on a high-field compact tokamak
Summary
Next-generation fusion experiments will investigate ways to reduce the size, cost, and complexity of an eventual fusion power plant. High-field, compact tokamak concepts will operate in a different parameter space than present-day machines; in addition to being smaller and of higher magnetic field, these machines will likely have higher plasma and current densities. These differences present both challenges and opportunities for diagnostics. 1), based on a proposal in Ref. 3 with parameters similar to those proposed for SPARC, to explore the ways in which high magnetic field, density, and current impact the operation of interferometry and polarimetry V utilizes the model machine geometry and synthetic diagnostics to predict signal levels
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