Tests on the SNS Rotating Target Design at the RTFT (ESS BILBAO)

Abstract

Efficient cooling of the target material is a key issue in the design of a spallation target. The aim of the RTFT (Rotating Target Flow Test) facility at ESS Bilbao (Zamudio, Spain) is the characterization of coolant flow in rotating targets. Maps of flow velocity along cooling channels are obtained with PIV (Particle Image Velocimetry) techniques. Tests are performed with water flowing at up to 30 l/s and 5 bar, for different disk rotation rates, and are used to evaluate target designs in terms of potential flow instabilities and adverse effects -such as flow stagnation and recirculation-, to benchmark calculation and simulation models, and to assess final target designs.ESS Bilbao and SNS have recently performed a first test campaign on a full scale mockup of the latest SNS design for a 1.5MW rotating target. Tests included runs at several operation conditions, plus an emergency stop simulation, for observation of the water flow evolution in a pump sudden stop event.

Conceptual design of the beryllium rotating target for the ESS-Bilbao facility

“…1. The conceptual design of such a target benefits from the analysis done during the design phase of other rotating target projects such as the second target station project SNS [14] or that regarding the German SNQ project [15], and from the experience acquired during the manufacturing of the rotating target flow test stand [16]. This test stand, built and operated within the ESS-Bilbao facilities, simulates the solid rotating design option for the second target station of SNS, within the framework of a collaborative agreement established between the two institutions.…”