An O1-ECRH heating constraint for stellarators

[jonmaddock]

In GitLab by @jlion on Dec 8, 2020, 11:56

An ECRH Constraint for stellarators

For stellarators the ECRH puts relevant constraints on the operation space which need to be included. It is:

\omega_{pe}^2 < \omega_{gyro}^2 < \omega_{max}^2

where $\omega_{pe}$ is the plasma frequency, $\omega_{gyro}$ the gyrofrequency and $\omega_{max}$ the maximum available gyrotron frequency (now user set).

For O1 heating this implies two constraints:

n_e<n_{e,crit}^{ECRH} = \frac{m_e \epsilon_0}{e^2} \omega_{gyro}^2~~\text{and}~~\omega_{gyro}<\omega_{max}.

PROCESS now checks with constraint equation 85 if an operation point at $n_{e,crit}^{ECRH}$ and $B_{max}^{ECRH}$ is ignited.

• max_gyrotron_frequency is now an input parameter and sets the maximal available gyrotron frequency.
• te0_available is a new iteration variable that the ECRH needs to achieve at the ignition point (iteration variable 175)

[ym1906]

This was merged into PROCESS when the stellarator models were originally put in. This issue appears to be simply describing some of the work done. There is already a comment to describes this in the documentation.