IRIE KOKEN CO., LTD.Designers and manufacturers of Vacuum Bellows,
Vacuum Valves, and Vacuum Equipment
Our “Big BPM (beam position monitor)” received the encouragement prize of “CHO” MONODZUKURI Innovative Parts and Components Award 2010 by the Conference for the Promotion of MONODZUKURI and Nikkan Kogyo Shimbun, Ltd. (sponsored by the Ministry of Economy, Trade and Industry, and the Japan Chamber of Commerce and Industry). This prize is granted to awarded to enterprises whose parts play a significant role in support of Japanese industry and society, with the spotlight directed on parts and members playing a behind-the-scenes role as a the source of manufacturing competitiveness.
The awards ceremony was held at the KFC (Kokusai Fashion Center) Hall on November 26 (Fri). We are grateful for being able to contribute to improving the smooth operation performance at the J-PARC facility that will transmit our technological capabilities and our state-of-the-art science and technology information around the world.
「Big BPM (beam position monitor)」
This is a proton beam position detector (monitor) installed at the incident region of the J-PARC’ 3GeV synchrotron, consisting of a rectangular detector body, and a circular vacuum vessel flanged at both ends, which covers the outside of it. The electrodes were made large rectangular, and in order to eliminate the influence of pressure, the external cylinder of the vacuum vessel and the housing that fixes the electrodes were separated. Also, in order to address resistance to radiation and weight reduction, titanium was used as the material for the electrodes, vacuum vessel, and bellows. The variation of capacitance between electrodes is improved and the change in the capacitance by internal vacuum and atmospheric pressure was zeroed.
By studying shielding gas conditions and jigs for welding, we have developed a welding technology with very little oxidation.● Bellows: Smoothly connected to deformed ceramics ducts with built-in shield fingers.
* Size: φ581.1 × φ639 (pure titanium class 1)
* Amounts of displacements: Axial direction -10, +5mm; Perpendicular-to-an-axis offset ±1mm
* Contact load: 60g or more
● Examination and test
* Degree of vacuum reached: <10-7Pa He leak rate: <1×10-10Pa·m3/s Gas emission volume: <10-8Pa·m3/s/m2
* Variation of capacitance between electrodes: * Impedance transformer (transmission characteristics): 0.68 - 2MHz
