| The Space Environment Simulation and Research Infrastructure project(SESRI)is under construction in Harbin.This project belongs to the "The 12th Five-Year Plan" of China.The university of Harbin Institute of Technology is the leader and The Institute of modern physics(Chinese Academy of Sciences)is responsible for the design and build of the accelerator part.After establishment,researchers could simulate the space environment filled with particles.This paper makes researches in the alignment,vibration monitoring and vibration absorption design for dipoles magnets in synchrotron and scanning magnets in terminals.The main achievements are shown as follows(1)Design a fast alignment system using displacement sensors and angle sensors,which is the foundation of the vibration displacement monitoring.the laser displacement sensors and tilt sensors are used to replace the commonly used measuring equipment such as laser tracker.Researchers could easily get the adjusting values in six degrees of freedom(6dof)using matrix operation.And watching the data change when the magnet is being adjusted in position and pose.As a result,the alignment works could be quickly finished.There is a sketch:1.To measure the pose.When the magnet is lifted and moved to the target position.The laser tracker should be used to get coordinates of the all the target points,and make calculations to get the magnet’s pose matrix in control net,this pose matrix is {C},the designed pose matrix is {A} and the magnet coordinate in itself is {B}.so that the pose of coordinate {C} in coordinate {A} could be calculated,defining it as ACT.At the beginning,the coordinate {B} and the coordinate {C} have the same position and pose,AT=ABT.2.Alignment and adjusting the magnet position.This process could be seen as the coordinate {B} moving from coordinate {C} to coordinate {A}the coordinate {C} is reference frame and coordinate {A} is the target.Make inverse transformation for ACT,and CAT is adjusting matrix.Calculate CAT to get M1(γ,β,α,qx,qy,qz)and this is base of adjusting work.Basing on sensors,another M_c(Y_c,β_c,α_c,l_xc,l_yc,L_zc),could be measured when m1=mc in promised enor the magnet get the target position and pose.Conclusion:1、the whole process of alignment using this method only uses laser tracker once.And after that,there is no need for another worker to move Spherically Mounted Retroreflector(SMR);researchers don’t have to use measuring instrument like laser tracker repeatedly.2、Comparing M1 and sensors data Mc.Workers could directly get the best adjusting distances and angles in 6dof.The whole process has extreme efficiency and a worker less.This alignment method could be used in any regular shape equipment(2)Design a vibration displacement monitoring system,and use part of it to test vibration and noise in the terminal scanning magnet in SESRI,verifying the necessity of vibration reduction.The principle of monitoring is the same as alignment illustrated above.After the process of alignment,the magnet is located at the target position with promised error and there is a matrix CBT according to coordinate {C},so that the matrix ABT which is representative of the real position of the magnet could be get by equation ABT=ACTCBT.When ABT is a unit matrix,it means the magnet is on the designed position.The ABT changes when the sensors data change with the vibration displacement happens in magnet.In this way,researchers are able to monitor the real-time vibration displacement on computer.In the test of SESRI’s terminal scanning magnet with laser displacement sensors,the sensors is able to measure the amplitude in micron dimension,the precision could fit the need in vibration monitor.The test result shows that the vibration source is the magnet coil,and the amplitude is positively related to the frequency and magnitude of current,the frequency is the main factor.It also shows that the vibration displacement could be added to millimeter level.These results prove that vibration monitoring system is reliable and suitable method to achieve vibration attenuation is necessary(3)Design vibration absorber support for scanning magnet in SESRI.This magnet support is designed using finite element method(FEM)with the maximum force calculated in Opera electromagnetism.The ordinary rigid supports have been designed as a control group.For better vibration absorption effect,the two scanning magnets are placed in one support to lower center of gravity in magnets-support system and improve stability.The damping module is designed separately,and the stiffness and damping could be changed by changing the overlaying mothed of disc springs and damper plates.Static stress,modal and harmonic response have been done in FEM,the result shows that compared with rigid supports,the resonance frequencies have decreased 5.91%and 8.96%respectively in two magnets;Comparing the magnet SH on the rigid support and vibration absorber support,when 200Hz,the vibration displacement has decreased 66.98%in harmonic response analysis. |
