Realtime temperature feedback on Hi Re XSr Luis

Real-time temperature feedback on Hi. Re. X-Sr Luis F. Delgado-Aparicio 1, M. Bitter 1, N. A. Pablant 1, K. Hill 1, J. Rice 2, Y. Podpaly 2, M. L. Reinke 2, J. R. Wilson 1, D. Johnson 1 ① Motivation: • Hi. Re. X-Sr can experience temperature excursions as much four degrees due to the nonreproducible conditions of the testcell temperature. ② Goal: • Eliminate the crystal temperature excursions or stabilize the crystal temperature through real-time temperature feedback. ③ Background: • Any change in the interplanar spacing will result in an apparent measurement of a non-zero velocity:

New off-the-shelf electronics allows heating and control of spectrometer housing at 30 ± 0. 1 ℃ ② ① Local area network. ① ② Individual K-type thermocouples sense the heating-pad temperatures and activate the feedback process. ⑤ ④ ③ ③ a) ② b) c) ① d) e) ③ CNi 16 D 44 -C 24 controller with C 4 EI option for slaving up to 32 devices through MODBUS RS-485 protocol. Pulse width output (duty cycle: 0→ 0. 99) ④ Solid state relays (duty cycle control: capable up to 25 Amps). ⑤ Diode limiting the current and power dissipated (no full use of ~5 W/in 2 capability).

New in-situ temperature sensing & feedback systems can be controlled/adjusted remotely Elements ① 8 -channel ethernetbased power strip. ③ ② ① ② Remotely controlled unit capable of sensing and “tuning” the individual temperatures of thermal pads according to programmable setpoints. ③ Data acquisition switch/multiplexer unit allowing sensing of five 4 -wire flexible-molded resistive temperature devices (RTDs) monitors placed inside Hi. Rex-Sr. Real-time data will also be available in the C-Mod data archive tree.