This task update will cover two years since there was no update submitted last year.
The capability to create a LEO environment from a user-uploaded trajectory was added. User trajectories may either be analyzed as before (by integrating the environment over the trajectory) or on a point-by-point basis. When the job is submitted as an averaged trajectories, the external environment (boundary condition) is computed at each trajectory point and integrated to obtain an average environment. The average environment is then run as a single computation to provide total response quantities (and averaged per-day rates) for the entire trajectory. When the job is submitted as a point-by-point trajectory, the external environment is computed at each trajectory point and run as a separate job. The results are then combined and returned as a function of time along the trajectory.
The capability to run ray-by-ray transport for vehicle thickness distributions was added. In this analysis, the transport is run along each ray in the thickness distribution and includes backward neutron transport (like slab calculations). This allows thickness distributions to have up to 100 different materials, in any order, along each ray.
The Badhwar-O'Neill 2010 GCR model was added for freespace, Earth orbit, and surface environments. The user can still select the older Badhwar-O'Neill 2004 as well but the site now defaults to the 2010 model.
The lunar surface environment has been updated to add the neutron albedo. Jobs that are submitted as an interpolation-based run will have the neutron albedo applied to surface-pointing rays, while the rest of the rays will receive the free-space environment. The GCR albedo is computed without the vehicle. The SPE albedo is considered negligible since the vehicle would shield the lunar surface in the 1-D transport, thus it is set to zero. In the case of ray-by-ray transport, an appropriate amount of lunar regolith is added to the surface pointing rays, which will automatically account for the neutron albedo in the bi-directional transport along each ray.
Generalized spheres can now be created and used for project geometries. These spheres are defined similarly to slabs and can contain any number of layers and materials. These jobs are run using forward-only transport and effective dose calculations use an orientation-averaged, or spinning astronaut, phantom position.
Mars surface environments (for SPE and GCR) have been added. The Mars environments can only be used with vehicle thickness distributions and are always executed using ray-by-ray transport. A surface-local-vertical vector needs to be defined to indicate which hemisphere is up and exposed to the atmosphere. The opposite hemisphere is assumed to be regolith. A Field-of-View (FOV) response has also been added for Mars surface projects to aid in comparisons to particle telescope-type instruments.
OLTARIS currently has 170 active accounts. 70 accounts are government (including NASA, ORNL, JPL, AFRL, and FAA), 54 are university professors/researchers/students, and 46 are industry (including Boeing, Space X, Lockheed-Martin, ATK, Northrup Grumman, and Bigelow Aerospace).
There have been 10,900 jobs run through OLTARIS since counting began in November 2009.