TY - RPRT TI - Single Primary Heat Extraction and Removal Emulator (SPHERE) Long Duration Testing AU - Sellers, Zachary Don [Idaho National Laboratory] AU - Hartvigsen, Jeremy Lee [Idaho National Laboratory] (ORCID:0000000293205552) AU - Sabharwall, Piyush [Idaho National Laboratory] (ORCID:000000032567205X) AU - Yilgor, Ilyas [Idaho National Laboratory] (ORCID:0000000169986662) PY - 2025 UR - https://www.osti.gov/biblio/3028398 ID - 3028398 ER -