Abstract
The new generation internal beam dump of the Super Proton Synchrotron (SPS) at CERN will have to dissipate approximately 270 kW of thermal power, deposited by the primary proton beam. For this purpose, it is essential that the cooling system features a very efficient heat evacuation. Diffusion bonding assisted by Hot Isostatic Pressing (HIP) was identified as a promising method of joining the cooling circuits and the materials of the dump's core in order to maximise the heat transfer efficiency. This paper presents the investigation of HIP assisted diffusion bonding between two CuCr1Zr blanks enclosing SS 316L tubes and the realisation of a real size prototype of one of the dump's cooling plate, as well as the assessments of its cooling performance under the dumps most critical operational scenarios. Energy-dispersive X-ray (EDX) spectroscopy, microstructural analyses, measurements of thermal conductivity and mechanical strength were performed to characterize the HIP diffusion bonded interfaces (CuCr1Zr-CuCr1Zr and CuCr1Zr-SS316L). A test bench allowed to assess the cooling performance of the real size prototype. At the bonded interface, the presence of typical diffusional phenomena was observed. Moreover, measured tensile strength and thermal conductivity were at least equivalent to the lowest ones of the materials assembled and comparable to its bulk properties, meaning that a good bonding quality was achieved. Finally, the real size prototype was successfully tested with an ad-hoc thermal test bench and with the highest operational thermal power expected in the new generation SPS internal beam dump.
Highlights
This paper presents the investigation of hot isostatic pressing (HIP) assisted diffusion bonding between two CuCr1Zr blanks enclosing SS 316L tubes and the realization of a real size prototype of one of the dump’s cooling plates, as well as the assessments of its cooling performance under the dump’s most critical operational scenarios
The real size prototype was successfully tested with an ad hoc thermal test bench and with the highest operational thermal power expected in the new generation Super Proton Synchrotron (SPS) internal beam dump
These results demonstrated the possibility to use HIP as a manufacturing technique for the cooling plates of the new generation SPS internal beam dump, but they open up the way for further investigations on its exploitability to improve the cooling performance of any future high intensity beam intercepting device or in general devices requiring very efficient heat evacuation systems
Summary
The new generation internal beam dump (Target Internal Dump Vertical Graphite, TIDVG#5 [1]) of the Super Proton Synchrotron (SPS) at CERN, built in the framework of the Large Hadron Collider (LHC) Injectors Upgrade (LIU) Project [2] has been installed in the long straight section 5 (LSS5) of the SPS during the CERN’s Long Shutdown 2 (LS2), 2019–2020. This device, and in general of most beam intercepting devices (BIDs) at CERN, increasingly demanding. The core of the SPS internal dump is made of an array of absorbing blocks consisting in 4.4 m of isostatic graphite, 0.2 m of TZM, and ∼0.4 m of pure tungsten, enclosed within 2.5 m long CuCr1Zr cooling plates and under ultrahigh vacuum conditions (UHV). Whenever high energy proton beams need to be dumped (i.e. in case of emergency, during LHC beam setup or LHC filling, machine developments and to dispose of the part of the beam for fixed targets remaining after the slow-extraction process), they are deflected onto the absorbing blocks by an upstream set of three vertical and three horizontal kickers
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
