The Gamma-Ray Imager/Polarimeter for Solar flares (GRIPS) instrument is installed in the B-2 vacuum chamber for a full-instrument thermal-vacuum test in 2015. The GRIPS telescope was launched via balloon in January 2016 on a high-altitude flight over Antarctica to  study the acceleration and transport of solar flare particles.
GRIPS test in the B-2
Documentation and PR photographs of Gamma-Ray Imager/Polarimeter for Solar Flares (GRIPS) test hardware at Plum Brook B-2 Faciity (Bldg. 3211)
GRC-2015-C-01893
Documentation and PR photographs of Gamma-Ray Imager/Polarimeter for Solar Flares (GRIPS) test hardware at Plum Brook B-2 Faciity (Bldg. 3211)
GRC-2015-C-01964