June 28, 2015 to July 2, 2015
JW Marriott Starr Pass Resort
Etc/GMT-7 timezone

Performance evaluation of a developed orifice type heater for thermal compensation control at J-PARC cryogenic hydrogen system

Jun 30, 2015, 2:00 PM
Exhibit Hall (Arizona Ballroom)

Exhibit Hall (Arizona Ballroom)

Poster Presentation CEC-02 - Large-Scale Systems, Facilities, and Testing C2PoH - Hydrogen Systems


HIDEKI TATSUMOTO (Japan Atomic Energy Agency)


The J-PARC cryogenic hydrogen system provides supercritical hydrogen with the para-hydrogen concentration of more than 99 % and the temperature of less than 20 K to three moderators so as to provide cold pulsed neutron beams of a higher neutronic performance. The nuclear heating is estimated to be 3.75 kW at the moderators for a 1-MW proton beam operation. The temperature rise is estimated to be 2.4 K at a circulation flow rate of 0.19 kg/s. There was concerned that the slight temperature rise would lead to a large pressure increase in the hydrogen loop since the supercritical hydrogen behaves as an incompressible fluid. Furthermore, temperature fluctuation of the feed hydrogen stream should be also reduced below 0.25 K because the neutron performance is affected by a hydrogen density change. We prepared a heater for thermal compensation and an accumulator, with a bellows structure, for volume control, so as to mitigate the pressure fluctuation caused by the proton beam on and off. We have developed a compact orifice type high-power heater and perform its performance evaluation during off and on beam operation. It is clarified through the commissioning processes that the heater control would be applicable for the 1-MW proton beam operation by extrapolating from the experimental data.

Primary author

HIDEKI TATSUMOTO (Japan Atomic Energy Agency)


Mr Hideo Muto (Japan Atomic Energy Agency) Mr Katsuhiro Aoyagi (Japan Atomic Energy Agency) Mr Kiichi Ohtsu (Japan Atomic Energy Agency) Dr Tomokazu Aso (Japan Atomic Energy Agency) Mr Yoshihiko Kawakami (Japan Atomic Energy Agency)

Presentation materials