AMS02 Tracker Thermal Control System (TTCS) Design, Model and Breadboard Results

The AMS Tracker Thermal Control System (TTCS) is a two-phase cooling system developed by NIKHEF (The Netherlands), Geneva University (Suisse), INFN Perugia (Italy), Sun Yat Sen University Guangzhou (China) and NLR (The Netherlands). The TTCS is a mechanically pumped two-phase carbon dioxide cooling loop. Main objective is to provide accurate temperature control of AMS Tracker front-end electronics. Additional objective is to prove and qualify a two-phase pumped cooling in orbit and collect operational data in μ-g environment over a period of three years. The paper describes the concept selection, breadboard results and an outlook to the experiments in orbit.