Abstract
The Institute of Modern Physics (IMP) has developed a magnetic measurement system of the triplet quadrupoles in drift tube linac (DTL), based on the rotating coil method. The most important measurement requirement of the triplet in DTL is the deviation between the machinery axis of the cavity and the magnetic axis of the triplet quadrupoles, which is less than 0.1 mm, the angle deviation is less than 1 mrad. The magnetic field quality is also measured. There are two aspects to be considered when designing the system, one is the mechanical adjustment mechanisms for the three quadrupoles respectively, another is the specialized compensated coil consisting of two sets of windings which can be connected to measure the magnetic center and the high order harmonic errors. Simultaneously, optimizing the testing process is also crucial. Based on the results obtained on the two triplets in two tanks for a Heavy Ion Medical Machine with Linear Accelerator (HIMM-LINAC), the magnetic measurement system could meet the requirements
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