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アイヌ語の助動詞「a」は主に文のレベルにおける現象に基づいて、「過去・完了」を表現するアスペクト助動詞として説明されてきた（金田一1931、知里1974［1936］、佐藤2008 など）。文レベルのアスペクト形式がテキストレベルにおいてタクシス（taxis）機能を果たすという事実はすでに日本語の研究や中国語の研究でも明らかになっているが、アイヌ語に関する諸研究においては、管見の限りでは、示唆されたことはあるが、詳細に関する研究はまだなされていないと言ってよいと思われる。本稿は文レベルを超えて、テキストレベルで中国語の「過」の視点から、アイヌ語の「a」のタクシス機能の解明を試みるものである。アイヌ語の現地調査は話者の減少により、現在極めて困難な状況になっている。故に、本稿で使用するアイヌ語のデータは筆者が自ら調査したものではなく、すべて公開されているものである。基本的に本稿で使用するアイヌ語のデータは早稲田大学語学教育研究所、『アイヌ語音声資料1-12』（田村1984-2000）に限定した（沙流方言）が、適宜他の沙流方言資料のデータも参考にしてある。なお、『アイヌ語音声資料1-12』の中にはいくつかの異なるジャンルのテキストが含まれているので、その点については以下、必要に応じて言及することにする。また、言語的に沙流方言に近いとされる千歳方言の研究成果も注意しつつ考察に利用する。, In terms of the auxiliary verb a in the Saru dialect of Ainu language, previous studies have made achievements at the sentence level, but few studies have focused on the text level. Based on previous studies, this study compares the Ainu word a with the Chinese guo from the perspective of Chinese and examines the function of a at the text level. Firstly, the results show that when a appears immediately after the predicate verb, it represents ‘sequentiality’ (successive temporal relationship) of the taxis function, which is similar to the Chinese guo. The a which represents ‘sequentiality’ has the characteristic of seeking the next event, so it cannot appear in the last event of the sentence. Secondly, in the modifying phrase, a still represents the ‘sequentiality’ while Chinese guo means the ‘anteriority’ (earlier in time). Lastly, the results reveal that a also represents ‘sequentiality’ when co-occurring with the continuous form wa an. Based on these results, this study argues that a represents ‘sequentiality’ at the text level. Besides, this study shows that a may not represent the function of ‘direct evidentiality’ when it appears in the modifying phrase, although the examples are not so many. Furthermore, this study indicates that the continuous form wa an shows ‘anteriority’ at the text level.

Superconducting 499.8-MHz radio frequency (rf) cavities have been proposed for the High Energy Photon Source (HEPS), a 6-GeV diffraction-limited synchrotron light source currently under construction in Beijing. Being an active third-harmonic system, two cavities shall provide 3.5-MV rf voltage and 400 kW of beam power to enable a complex rf gymnastics required by a novel injection scheme. Adopting the veteran KEKB-type 500-MHz single-cell geometry, the cavity design has been focused on optimizing its mechanical properties. Various cavity wall thickness and external stiffening mechanisms were investigated to reinforce the cavity to ensure compliance to the pressure vessel codes under different working conditions from a bare cavity to a dressed cavity in the cryomodule. Small margins on operational pressure previously reported on this type of cavity have been largely improved with slightly reduced yet acceptable frequency tunability. Extensive design optimizations have been conducted aiming for lower stress, larger elastic buckling pressure, and higher frequencies of mechanical modes to cause microphonics, while the frequency tunability, pressure sensitivity, and Lorentz force detuning were being carefully monitored. In view of the HEPS’s lifetime, cavity fatigue was examined. This constitutes a comprehensive design optimization of the 499.8-MHz single-cell superconducting cavity with improved mechanical properties.

The accelerator-driven subcritical system (ADS) is the internationally recognized key technology of nuclear waste problem treatment, of which superconducting proton linac is an important part. With the support of the strategic science and technology pilot project of the Chinese Academy of Sciences, the Institute of High Energy Physics of the Chinese Academy of Sciences took the lead in the research of 325 MHz superconducting proton linac, which is called ADS Injector I. The superconducting accelerator part of ADS Injector I mainly consists of 14 spoke-type superconducting cavities with β 0.12. At the same time, the research work of various cavities with different β values and different frequencies is also carried out to lay the technical and technological foundation for ADS main accelerator. The only way to determine whether the superconducting cavity can reach the design target and whether it can be installed into the cryostat is the vertical test at cryogenic. As the only way to test the microwave performance of the superconducting cavity at low temperature, the vertical test can accurately test the acceleration gradient Eacc and the corresponding quality factor Q0 of the superconducting cavity. The design and construction of the superconducting cavity vertical test facility is based on the practical needs of the pilot project and the long-term development of the superconducting accelerator. This paper mainly introduces the design and construction of the cryogenic vertical test system for the superconducting cavity of ADS Injector I, including the system scheme design, process design, heat load analysis, 2 K superfluid helium obtaining method, system commissioning and operation, etc. The static heat leakage at 2 K of the 2 K superfluid helium vertical test system of ADS Injector I is 1.624 W, which has reached the international advanced level. The 2 K superfluid helium vertical test system of ADS Injector I after constructed not only meets the test requirements of ADS pilot project, but also conducts 4 K and 2 K vertical tests for other different types of superconducting cavities and relevant cryogenic experiments.