Capillary array and preparation method and application therefor

A method for preparing a capillary array, comprising the following steps:

• S1, arranging and drawing glass prefabricated tube to form multifilaments, wherein the glass prefabricated tube is composed of a first glass on an inner side and a second glass on an outer side;
• a softening point of the first glass is T1, a softening point of the second glass is T2, a value of T1 minus T2 is in a range from 30° C. to 50° C.;
• and a thermal expansion coefficient of the first glass is α1;
• S2, arranging the multifilament into a capillary bundle, and then covering a plurality of layers of third glass monofilaments around a periphery of the capillary bundle to form an edge covering region, obtaining a billet, wherein a softening point of a third glass is T3, and a value of T2 minus T3 is in a range from 50° C. to 100° C.;
• and a thermal expansion coefficient of the third glass is α3, and a value of α1 minus α3 is in a range from 2×10−7/° C. to 10×10−7/° C.;
• S3, melting and pressing the billet, and then cutting two end faces of the billet, a temperature T of the melting and pressing being:
• T2<T<T1;
• and
• S4, plating a low refractive index layer in each capillary that consists the capillary bundle, a refractive index of the low refractive index layer being less than a refractive index of a liquid scintillator.