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Temperature Control in DC Spark System II

Temperature Control in DC Spark System II. Anders Korsbäck. Context. Introducing sample temperature control into DC Spark System II makes several interesting measurements possible Direct effect of temperature on breakdown rate In-situ annealing of samples

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Temperature Control in DC Spark System II

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  1. Temperature Control in DC Spark System II Anders Korsbäck

  2. Context • Introducing sample temperature control into DC Spark System II makes several interesting measurements possible • Direct effect of temperature on breakdown rate • In-situ annealing of samples • Temperature control was originally attempted in 2011-2012 but abandoned • Lack of gap distance control to compensate for thermal expansion • Temperature controller was damaged and broken in lab mishap • Installation of liquid nitrogen line in lab was delayed • Time was running out for people, other things got priority • Controller has now been repaired and put together after many trials and even more errors (thanks to Kyrre for helping out!) Anders Korsbäck

  3. Overview of controller • Sample heating is carried out by electron bombardment of a plate in thermal (but not electrical – our modification) contact with sample • Filament is heated ohmically, thermally emitted electrons are accelerated by 650 V potential to hit heater anode and deposit their kinetic energy into it • EBHC runs feedback control, using thermocouple reading as input signal and regulating the filament voltage and current • Nominal temperature range -180 °C to +1000°C (+1200 °C without cooling) Anders Korsbäck

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