Texas State University is requesting competitive proposals for selection for a responsive and responsible firm to provide a cryogen-free superconducting measurement system. General System Requirements - Variable-temperature sample space housed within a cryostat dewar equipped with an integrated pulse-tube refrigerator cold-head. - Helium compressor with a minimum 20,000-hour adsorber service interval. - Initial liquid-helium operating charge generated directly from helium gas, reaching steady-state conditions within 40 hours. - Continuous recondensation of evaporated helium within the dewar after initial cooldown. - No needle valves or manual helium-flow adjustments. - No high-vacuum pump required for installation, cooldowns, or blockage recovery. - Electronics and pumping cabinet included. - Menu-driven control platform with system logging and data-acquisition software running on Windows, with user-accessible USB port, keyboard, mouse, and monitor. - Integrated system-control software with automated operation and measurement via sequence-builder functionality.
