October 13, 2017
The NPL COMPASS group was awarded an approximately 10 million node-hour Petascale Computing Resource Allocation (PRAC) on Blue Waters. The allocation allows the "Mapping of Proton Quark Structure using Petabytes of COMPASS Data". Over two years, experimental data of the years 2015 through 2018 will be processed (calibrated, aligned, and "tracked") and Monte-Carlo data will be simulated at quantities that will keep systematic uncertainties of the physics observables at the minimum level possible. Due to the parallel processing features of Blue Waters, data production is significantly faster than at all other computing farms available to us and collaborators.
The COMPASS experiment located in the North Area of CERN, Switzerland/France, studies the 3D structure of the proton. Tomographic pictures of the proton can be obtained by impinging a high-energetic beam of charged particles onto a fixed target containing protons. Drell-Yan "pion-proton" scattering employing a transversely polarized proton target yields proton slices in quark transverse momentum (2015 and 2018 data), while Deeply Virtual "muon-proton" Compton Scattering using a polarized muon beam results in information about the "impact parameter" of quarks inside the proton (2016 and 2017 data).
COMPASS collects an annual raw dataset of about 1 petabyte. Together with reduced mini-Data Summary Trees (mDSTs) and the simulated data, four years of data will amount to about 10 petabyte. Exploratory studies on COMPASS data transfer and production on Blue Waters were successfully completed in 2016 by Vincent Andrieux, Robert Heitz, Marco Meyer, Matthias Perdekamp and Caroline Riedl.
Announcement of the 3 PRAC 2017 awards: