Abstract
This paper presents the fabrication and construction of the aluminum target chambers for SGIII laser facilities. The technical difficulty of the vacuum seal weld for the large scale aluminum target chamber has been overcome by using the special designed processing fixtures, the support and clamp fixtures, and double face multi-pass GMAS process in protective temporary enclosures. The mean pointing error of the 144 ports of the TIL chamber is 0.09mm on NC machine tool through the special designed index rotate mechanism. The field precision fabrication and construction of SGIII chamber has been achieved by the special drilling machine for accurately boring holes, the special fixture for accurately positioning the ports in the holes for welding, the laser tracker, the adjustment mechanism, and the custom machined spacers. The alignment error is 0.3mm to 0.4mm. The helium spray probe leak testing and the nondestructive inspection were employed to ensure the vacuum performance. The whole vacuum leak checking has been done. The integrity leak rate of the target chambers were less than 1×10-10Pa.m3/s. The shooting experiments showed that both chambers have satisfied the vacuum and precision requirements of experiments.
Published Version
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