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Non evaporable getters (NEG), based on the principle of metallic surface sorption of gas molecules, are mostly porous alloys or powder mixtures of Al, Zr, Ti, V and Fe. They help to establish and maintain vacuums by soaking up or bonding to gas molecules that remain within a partial vacuum. This is done through the use of materials that readily form stable compounds with active gases. They are important tools for improving the performance of many vacuum systems. Sintered onto the inner surface of high vacuum vessels, the NEG coating can be applied even to spaces that are narrow and hard to pump out, which makes it very popular in particle accelerators where this is an issue. The main sorption parameters of the kind of NEGs, like pumping speed and sorption capacity, have low limits. A different type of NEG, which is not coated, is the Tubegetter. The activation of these getters is accomplished mechanically or at a temperature from 550 K. The temperature range is from 0 to 800 K under HV/UHV conditions.
Strip NEG pump for a particle accelerator and method of use
PendingCN122269555AImprove vacuum distribution uniformityavoid mistaken typingAcceleratorsParticle acceleratorNuclear engineering
The application discloses a strip type NEG (Non Evaporable Getter) pump for a particle accelerator and a use method thereof. The pump comprises a getter assembly, a fixing part, a vacuum flange and an electrode. One end of the getter assembly is provided with the fixing part, the fixing part is fixedly connected with one side of the vacuum flange, the other side of the vacuum flange is provided with the electrode, and the getter assembly is electrically connected with the electrode. The getter assembly comprises two or more getter strips, each getter strip is arranged side by side and fixedly connected with the fixing part at one end, and a gap is reserved between two adjacent getter strips. The use method is that the strip type NEG pump is inserted into a vacuum chamber along the axial direction of the vacuum chamber and then fixedly installed, each getter strip is parallel to the axis of the vacuum chamber, the vacuum flange is fixedly installed with the side wall of the vacuum chamber, and the electrode is externally connected with a power supply device. The application can effectively improve the uniformity of vacuum distribution, maintain a high vacuum degree, avoid misfiring of a beam, has a simple structure, is convenient to install, and can be adapted to the installation requirements of the accelerator vacuum chamber in a large range.
Owner:UNIV OF SCI & TECH OF CHINA