| Article | |
| Report number | arXiv:1911.10198 ; FERMILAB-CONF-20-450-AD |
| Title | Radiation Damage Studies on Titanium Alloys as High Intensity Proton Accelerator Beam Window Materials |
| Author(s) |
Ishida, Taku (J-PARC ; KEK, Tsukuba) ; Wakai, Eiichi (J-PARC ; JAEA, Ibaraki) ; Makimura, Shunsuke (J-PARC ; KEK, Tsukuba) ; Hurh, Patrick G. (Fermilab) ; Ammigan, Kavin (Fermilab) ; Casella, Andrew M. (PNL, Richland) ; Edwards, Danny J. (PNL, Richland) ; Senor, David J. (PNL, Richland) ; Densham, Christopher J. (Rutherford) ; Fitton, Michael (Rutherford) ; Bennett, Joe (Rutherford) ; Kim, Dohyun (Brookhaven) ; Simos, Nikolaos (Brookhaven) ; Calviani, Marco (CERN) ; Torregrosa Martin, Claudio (CERN) |
| Publication | 2020 |
| Imprint | 2019-11-22 |
| Number of pages | 10 |
| Note | 10 pages, 7 figures, In Proc. of IWSMT-14, 14th International Workshop on Spallation Materials Technology, 11th-17th Nov. 2018 at Fukushima, Japan |
| In: | JPS Conf. Proc. 28 (2020) 041001 |
| In: | 14th International Workshop on Spallation Materials Technology, Fukushima, Japan, 11 - 17 Nov 2018, pp.041001 |
| DOI | 10.7566/JPSCP.28.041001 (publication) |
| Subject category | physics.acc-ph ; Accelerators and Storage Rings ; nucl-ex ; Nuclear Physics - Experiment ; hep-ex ; Particle Physics - Experiment ; physics.ins-det ; Detectors and Experimental Techniques |
| Abstract | A high-strength dual alpha+beta phase titanium alloy Ti-6Al-4V is utilized as a material for beam windows in several accelerator target facilities. However, relatively little is known about how material properties of this alloy are affected by high-intensity proton beam irradiation. With plans to upgrade neutrino facilities at J-PARC and Fermilab to over 1 MW beam power, the radiation damage in the window material will reach a few displacements per atom (dpa) per year, significantly above the 0.3 dpa level of existing data. The RaDIATE collaboration has conducted a high intensity proton beam irradiation of various target and window material specimens at BLIP facility, including a variety of titanium alloys. Post-Irradiation Examination of the specimens in the 1st capsule, irradiated at up to 0.25 dpa, is in progress. Tensile tests in a hot cell at PNNL exhibited a clear signature of radiation hardening and loss of ductility for Ti-6Al-4V, while Ti-3Al-2.5V, with less beta phase, exhibited less severe hardening. Microstructural investigations will follow to study the cause of the difference in tensile behavior between these alloys. High-cycle fatigue (HCF) performance is critical to the lifetime estimation of beam windows exposed to a periodic thermal stress from a pulsed proton beam. The 1st HCF data on irradiated titanium alloys are to be obtained by a conventional bend fatigue test at Fermilab and by an ultrasonic mesoscale fatigue test at Culham Laboratory. Specimens in the 2nd capsule, irradiated at up to 1 dpa, cover typical titanium alloy grades, including possible radiation-resistant candidates. These systematic studies on the effects of radiation damage of titanium alloys are intended to enable us to predict realistic lifetimes of current beam windows made of Ti-6Al-4V and to extend the lifetime by choosing a more radiation and thermal shock tolerant alloy. |
| Copyright/License | CC-BY-4.0 preprint: (License: arXiv nonexclusive-distrib 1.0) |
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