Objectives The high accuracy alignment requirements of particle accelerators present a great challenge to measurement techniques. Due to the advantages of large volume, high precision and three-dimensional measurement of laser tracker, it is necessary to carry out the research on the measurement accuracy by laser tracker in particle accelerators.
Methods First, this paper studied the measurement accuracy of laser tracker itself, introduced the expression and test method of the accuracy, derived the calculation formula and explained its specific meaning of rated accuracy, which provided a theoretical basis for the measurement application and data processing. Then, the linear control network was taken as a representative for the accuracy analysis of control network by laser tracker in particle accelerator, and a measurement activity was implemented in the linac of China Spallation Neutron Source facility, two groups were assigned to survey with different laser trackers during the same period.
Results By analyzing the adjustment precision of each group and the coordinate deviations between the two groups, the weakest transversal accuracy of 200 m linear control network was confirmed and better than 0.2 mm. Moreover, in order to make a quick evaluation of the accuracy of linear control network, a method was proposed to estimate the accuracy with the network simplified to traverse network, and the rule of the weakest point accuracy was acquired that was proportional to the square root of the third power of length.
Conclusions These studies can provide guidance for accuracy analysis and scheme design of alignment in particle accelerators.
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