The original thermal conduction and radiation routines in Lare3d were based on a conservative SOR iterative solver. This was slow and often failed to converge to the desired accuracy. Following the publication of a Rune-Kutta-Legendre super-stepping scheme (Meyer et a. JCP 2014) Lare2d has been tested and the scheme extending this to MHD. New Lare2d and Lare3d updates will be released in a month time and will include the following new features: - Townsend exact integration method for radiative losses - Open boundaries based on Riemann characteristics - Full cylindrical and spherical geometry versions The first two would be needed for any chromospheric simulation. Last change is of niche interest. For the LoS integration through Lare3d simulation, this has been developed for our laser-plasma ALE code but not yet ported to Lare3d. We expect porting to be completed probably early next year. This activity will continue irrespective of end of the DKIST grant (other funding). Problem is getting a load balanced diagnostic which can integrate across MPI domains for spatial and time averages. Optimistic now we’ve redesigned this for laser-raytracing packages but I was optimistic 6 months ago and that didn’t work. Once this framework is in place it will allow pixel and cadence averaged L-S diagnostics from Lare3d in a module which should be general enough to be used in any MPI 3D code.

• Tool name: Lare3d
• Developers: Tony Arber, Keith Bennett
• Main Contact: Tony Arber (t.d.arber@warwick.ac.uk)
• Basic description: Improved Lare3d radiative losses and open boundaries plus LoS diagnostics.
• Language: Fortran
• Resource needed to use: Any computer
• Host location: Warwick
• Current status: Radiative and boundaries done. LoS in maybe 6-months
• 6-month plan to availability: Yes thankyou!
• Status of documentation: To be released with code in 6-months. Half completed.
• Test status: In beta testing
• How to reference tool in publication: Cite LAre JCP paper and this award