Parallelism measurement and trajectory planning of multi-channel double crystal monochromator
To address parallelism error compensation in a dual-rotation multi-channel double crystal mono-chromator(DCM),we propose a method using an autocollimator to measure the quasi-static parallelism of diffraction surfaces and an S-curve trajectory planning method.First,we analyze the structure and motion of the monochromator.Then,we present a measurement system framework using the autocollimator.We also propose an S-curve trajectory planning algorithm to optimize the motion trajectory based on parallel-ism measurements.Finally,experiments on the constructed platform show that the measurement system achieves a 0.5"resolution,with crystal angle transitions varying by hundreds of arcseconds.The S-curve planning algorithm reduces trajectory tracking error by 58.7%and 63.9%compared to a 5th order polyno-mial and unplanned trajectories,respectively,with a 6.1"tracking error.These results confirm the meth-od's efficacy in enhancing the performance of the monochromator.
synchrotron radiation X raydouble crystal monochromatorerror compensationparallelism measurementtrajectory planning
万方数据
维普
