Significant temperature difference(300-77 K or even 4 K) can cause large deformations and displacements of the beam position monitors(BPMs),which affect BPMs measurement resolution or even cause their malfunction in c...Significant temperature difference(300-77 K or even 4 K) can cause large deformations and displacements of the beam position monitors(BPMs),which affect BPMs measurement resolution or even cause their malfunction in cryogenic situations.In this paper,to check the offset from the mechanical to electrical center in low temperature(77 K),Fourier's law and finite element method are used to simulate cryo-deformation.Laser tracker and micro-alignment telescope are employed in combined BPM calibration,installation and monitoring.The calibration error is<0.02 mm,and the installation and monitoring precision are 0.06 mm and 0.01 mm,respectively.The monitored cryo-deformation agrees well with the simulation results.These indicate that the combined alignment can improve performance of the BPM system.All these guaranteed the success of running the 9.55 MeV@2.14 mA cw protons.展开更多
The demo facility of china ADS injector II was installed in the tunnel in 2014. The on-site layout of demo facility is shown in the Fig. 1. The demo faclity mainly includes ECRIS, LEBT, RFQ acclerator, MEBT and TCM6. ...The demo facility of china ADS injector II was installed in the tunnel in 2014. The on-site layout of demo facility is shown in the Fig. 1. The demo faclity mainly includes ECRIS, LEBT, RFQ acclerator, MEBT and TCM6. The TCM6 is composed by six SC HWR cavity,six SC soleniods and five BPMs. The TCM6 will be the prototype for the future 2025 MeV CADS superconducting linac. The beam commissioning of CADS Injector II started in June 2015. It mainly consists of three steps.展开更多
China Initiative Accelerator Driven System (CIADS) proposed by the Chinese Academy of Sciences which is one of the twelve Major National Scientific and Technological Infrastructures has been approved by National Devel...China Initiative Accelerator Driven System (CIADS) proposed by the Chinese Academy of Sciences which is one of the twelve Major National Scientific and Technological Infrastructures has been approved by National Development and Reform Commission of China, and supposed to be the first principle prototype ADS experimental facility in the world.展开更多
By combining interactive graphic CAD and optimizing methods we have developed an automated optimum CAD system for railway location AORLCAD. Using the AORLCAD, the optimization of both horizontal and vertical alignm...By combining interactive graphic CAD and optimizing methods we have developed an automated optimum CAD system for railway location AORLCAD. Using the AORLCAD, the optimization of both horizontal and vertical alignment of railway can be realized by using automated optimization interactive graphic design alternatively. The result makes automated optimum technique for railway location more completed. The methods of interactive graphic design and optimum techniques used by AORLCAD are introduced in detail.展开更多
A Medium Energy Beam Transport line 1 （MEBT1） has been designed for Injector Scheme II of the China, ADS project. To match the beam from RFQ to Superconducting （SC） Half Wave Resonator （HWR） sections with emitta...A Medium Energy Beam Transport line 1 （MEBT1） has been designed for Injector Scheme II of the China, ADS project. To match the beam from RFQ to Superconducting （SC） Half Wave Resonator （HWR） sections with emittance preservation, the MEBT1 has been designed to be mechanically compact. Working at 162.5 MHz, the MEBT1 transports a 10 mA, 2.1 MeV proton beam using seven quadrupoles and two bunching cavities within 2.7 meters. Three collimators are placed between every two adjacent quadrupoles to collimate the beam halo. Design and construction of the MEBT1 are presented in this paper.展开更多
基金supported by the National Natural Science Foundation of China(No.11605262)
文摘Significant temperature difference(300-77 K or even 4 K) can cause large deformations and displacements of the beam position monitors(BPMs),which affect BPMs measurement resolution or even cause their malfunction in cryogenic situations.In this paper,to check the offset from the mechanical to electrical center in low temperature(77 K),Fourier's law and finite element method are used to simulate cryo-deformation.Laser tracker and micro-alignment telescope are employed in combined BPM calibration,installation and monitoring.The calibration error is<0.02 mm,and the installation and monitoring precision are 0.06 mm and 0.01 mm,respectively.The monitored cryo-deformation agrees well with the simulation results.These indicate that the combined alignment can improve performance of the BPM system.All these guaranteed the success of running the 9.55 MeV@2.14 mA cw protons.
文摘The demo facility of china ADS injector II was installed in the tunnel in 2014. The on-site layout of demo facility is shown in the Fig. 1. The demo faclity mainly includes ECRIS, LEBT, RFQ acclerator, MEBT and TCM6. The TCM6 is composed by six SC HWR cavity,six SC soleniods and five BPMs. The TCM6 will be the prototype for the future 2025 MeV CADS superconducting linac. The beam commissioning of CADS Injector II started in June 2015. It mainly consists of three steps.
文摘China Initiative Accelerator Driven System (CIADS) proposed by the Chinese Academy of Sciences which is one of the twelve Major National Scientific and Technological Infrastructures has been approved by National Development and Reform Commission of China, and supposed to be the first principle prototype ADS experimental facility in the world.
文摘By combining interactive graphic CAD and optimizing methods we have developed an automated optimum CAD system for railway location AORLCAD. Using the AORLCAD, the optimization of both horizontal and vertical alignment of railway can be realized by using automated optimization interactive graphic design alternatively. The result makes automated optimum technique for railway location more completed. The methods of interactive graphic design and optimum techniques used by AORLCAD are introduced in detail.
基金Supported by National Natural Science Foundation of China(11079001)
文摘A Medium Energy Beam Transport line 1 （MEBT1） has been designed for Injector Scheme II of the China, ADS project. To match the beam from RFQ to Superconducting （SC） Half Wave Resonator （HWR） sections with emittance preservation, the MEBT1 has been designed to be mechanically compact. Working at 162.5 MHz, the MEBT1 transports a 10 mA, 2.1 MeV proton beam using seven quadrupoles and two bunching cavities within 2.7 meters. Three collimators are placed between every two adjacent quadrupoles to collimate the beam halo. Design and construction of the MEBT1 are presented in this paper.
