Speaker
Description
The Hefei Advanced Light Facility (HALF), currently under construction, is a fourth-generation synchrotron radiation source operating in the low-energy region (2.2 GeV) and based on diffraction-limited storage ring technology. The storage ring employs a modified hybrid 6BA lattice with a beam emittance of 86.3 pm·rad and consists of 20 achromat cells with a total circumference of approximately 480 meters. To meet the ultra-high vacuum environment of the storage ring, non-evaporable getter (NEG) films are applied to the inner surfaces of the vacuum chambers to provide distributed pumping capability and to reduce surface outgassing and photon-stimulated desorption. Large-scale NEG coating of the HALF storage ring vacuum chambers has been officially initiated. This paper presents an overview of the HALF storage ring vacuum system and provides a systematic description of the large-scale NEG coating system, including the equipment configuration and control system. In addition, a storage system for coated vacuum chambers is described to ensure film quality prior to installation, which provides technical support for subsequent assembly and commissioning.
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