共查询到20条相似文献,搜索用时 78 毫秒
1.
《中国物理C(英文版)》2016,(5)
Significant transient beam loading effects were observed during beam commissioning tests of prototype II of the injector for the accelerator driven sub-critical(ADS) system, which took place at the Institute of Modern Physics, Chinese Academy of Sciences, between October and December 2014. During these tests experiments were performed with continuous wave(CW) operation of the cavities with pulsed beam current, and the system was configured to make use of a prototype digital low level radio frequency(LLRF) controller. The system was originally operated in pulsed mode with a simple proportional plus integral and deviation(PID) feedback control algorithm,which was not able to maintain the desired gradient regulation during pulsed 10 m A beam operations. A unique simple transient beam loading compensation method which made use of a combination of proportional and integral(PI) feedback and feedforward control algorithm was implemented in order to significantly reduce the beam induced transient effect in the cavity gradients. The superconducting cavity field variation was reduced to less than 1.7% after turning on this control algorithm. The design and experimental results of this system are presented in this paper. 相似文献
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《The European Physical Journal A - Hadrons and Nuclei》2007,33(2):147-155
The beam asymmetry, Σ , was measured at ELSA in the reaction
p → ηp using linearly polarised tagged photon beams, produced by coherent bremsstrahlung off a diamond. The crystal was oriented
to provide polarised photons in the energy range E
γ = 800 to 1400MeV with the maximum polarisation of P
γ = 49 % obtained at 1305MeV. Both dominant decay modes of the η into two photons and 3π0 were used to extract the beam asymmetry from the azimuthal modulation of the cross-section. The measurements cover the angular
range Θcm ≃ 50 -150 degrees. Large asymmetries up to 80% are observed, in agreement with a previous measurement. The eta-MAID model
and the Bonn-Gatchina partial wave analysis describe the measurements, but the required partial waves differ significantly. 相似文献
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A. Sosa E. Bravin J. Harasimowicz A. Jeff C. P. Welsch The AEḡIS collaboration 《Hyperfine Interactions》2014,229(1-3):169-174
Detailed diagnostic of antiproton beams at low energies is required for essentially all experiments at the Antiproton Decelerator (AD), but will be particularly important for the future Extra Low ENergy Antiproton ring (ELENA) and its keV beam lines to the different experiments. Many monitors have been successfully developed and operated at the AD, but in particular beam profile monitoring remains a challenge. A dedicated beam instrumentation and detector test stand has recently been setup at the AE \(\bar {g}\) IS experiment (Antimatter Experiment: Gravity, Interferometry, Spectroscopy). Located behind the actual experiment, it allows for parasitic use of the antiproton beam at different energies for testing and calibration. With the aim to explore and validate different candidate technologies for future low energy beam lines, as well as the downstream antihydrogen detector in AE \(\bar {g}\) IS, measurements have been carried out using Silicon strip and pixel detectors, a purpose-built secondary emission monitor and emulsions. Here, results from measurements and characterization of the different detector types with regard to their future use at the AD complex are presented. 相似文献
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BEPCⅡ, the upgrade project of Beijing Electron Positron Collider (BEPC), is an accelerator with large beam current and high luminosity, so an efficient and stable injector is required. Several beam diagnostic and monitoring instruments are used. A new diagnostic instrument — wire scanner, has been designed and will be used to measure the profile of the linac beam of BEPCⅡ. This paper describes the prototype of this system and the cause of heat generating of the wire. Some simulation results of the heat and force by using finite element method software—ANSYS®,2) are presented and discussed. 相似文献
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A 162.5 MHz, 2.1 MeV radio frequency quadruples (RFQ) structure is being designed for the Injector Scheme Ⅱ of the China Accelerator Driven Sub-critical System (C-ADS) linac. The RFQ will operate in continuous wave (CW) mode as required. For the CW normal conducting machine, the heat management will be one of the most important issues, since the temperature fluctuation may cause cavity deformation and lead to the resonant frequency shift. Therefore a detailed multi-physics analysis is necessary to ensure that the cavity can stably work at the required power level. The multi-physics analysis process includes RF electromagnetic analysis, thermal analysis, mechanical analysis, and this process will be iterated for several cycles until a satisfactory solution can be found. As one of the widely accepted measures, the cooling water system is used for frequency fine tunning, so the tunning capability of the cooling water system is also studied under different conditions. The results indicate that with the cooling water system, both the temperature rise and the frequency shift can be controlled at an acceptable level. 相似文献
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YaningXie T.D.Hu T.Liu D.C.Xian 《北京同步辐射装置》2001,(1):147-150
At BSRF we have designed and constructed a four-blade slit for 4W1B XAFS beamline to improve its performance.The slit also functions as a beam position monitor by detecting the signal of photoemission from the blades.The key features of this design are:(1) adopting a new mechanism for blade adjustment;(2) combining the functions of two types of BPM (the single wire monitor and the double blade monitor) with the slit.Those features enable us firstly to accurately align the slit with the center of the beam,secondly to monitor the stability of the beam position during operation,and thirdly to diagnose the beam characteristics with this single device.The principle,the features and the testing results are presented in the following sections.2001 Elsevier Science B.V.All rights reserved. 相似文献
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G A V Ramanamurthy K Ramachandra Rao Y Rama Krishna P Venkateswarlu K Bhaskara Rao P V Ramana Rao S Venkata Ratnam V Seshagiri Rao G J Nagaraju S Bhuloka Reddy 《Pramana》2001,56(5):697-703
The Measurement of K
β
K
/α
intensity ratios are measured in some 3d shell elements by using a 2 MeV proton beam along with a high resolution Si(Li) detector. The present Measurement of K
β
K
/α
intensity ratios are in good agreement with Scofield modified theoretical values, thus supporting the basic assumptions in
that theory. From the present Measurement of K
β
K
/α
intensity ratios, it is evident that due to chemical effects, the experimental Measurement of K
β
K
/α
intensity ratios will be increased while they will be decreased due to the presence of simultaneous M-shell vacancies which are produced due to proton excitation. 相似文献
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The J-PARC linac has three DTL tanks to accelerate the negative hydrogen ions from 3 MeV to 50 MeV. The RF phase and amplitude are adjusted for each cavity with a phase scan method within the accuracy of 1° in phase and 1% in amplitude. The experimental results show a remarkable agreement with the numerical model within a suffcient margin in the tuning of the last two DTL tanks. However,a notable discrepancy between the experiment and the numerical model is seen in the tuning of the first DTL tank. After studying with a three-dimensional multi-particle simulation,the generation of the low energy component and the pronounced filamentation are identified as the main causes of the discrepancy. The optimization of the tuning scheme is also discussed to attain the tuning goal accuracy for the first DTL tank. 相似文献
10.
Elastic-scattering data were analyzed, and it was concluded on the basis of this analysis that precisionmeasurements of differential cross sections for elastic proton–proton scattering at the accelerator of the Institute for High Energy Physics (IHEP, Protvino, Russia) over a broad momentum-transfer range are of importance and topical interest. The layout of the respective experimental facility detecting the scattered particle and recoil proton and possessing a high momentum-transfer resolution was examined along with the equipment constituting this facility. The facility in question is able to record up to a billion events of elastic proton–proton scattering per IHEP accelerator run (20 days). Other lines of physics research with this facility are briefly discussed. 相似文献
11.
In this paper, the 2-D electrostatic field software, POISSON, is used to calculate the characteristic impedance of a BPM (beam position monitor) for a high current proton linac. Furthermore, the time-domain 3-D module of MAFIA with a beam microbunch at a varying offset from the axis is used to compute the induced voltage on the electrodes as a function of time. Finally, the effect of low 13 beams on the induced voltage, the sensitivity and the signal dynamic range of the BPM are discussed. 相似文献
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In this paper, the 2-D electrostatic field software, POISSON, is used to calculate the characteristic impedance of a BPM (beam position monitor) for a high current proton linac. Furthermore, the time-domain 3-D module of MAFIA with a beam microbunch at a varying offset from the axis is used to compute the induced voltage on the electrodes as a function of time. Finally, the effect of low β beams on the induced voltage, the sensitivity and the signal dynamic range of the BPM are discussed. 相似文献
13.
This paper introduces the design and simulation of a Wire Position Monitor (WPM) used in the cryogenic system of an Accelerator Driven System (ADS). The WPM is designed to monitor the contraction of cold masses during the cooling-down operation. In this paper, POISSON-2D electrostatic field software is used to calculate the best characteristic impedance for the WPM. Furthermore, the time domain signal of different end structures is theoretically analyzed and simulated. The coupling of electrodes and the influence of signal carrier size, which may influence the induced signal, are also discussed. Finally, the linearity of the induced voltage and the sensitivity of the WPM are analyzed. The time domain simulation results are consistent with the theoretical analysis. The influences of the coupling and carrier size are very small, and the linearity of the normalized voltage is good within r/2. 相似文献
14.
This paper introduces the design and simulation of a Wire Position Monitor(WPM)used in the cryogenic system of an Accelerator Driven System(ADS).The WPM is designed to monitor the contraction of cold masses during the cooling-down operation.In this paper,POISSON-2D electrostatic field software is used to calculate the best characteristic impedance for the WPM.Furthermore,the time domain signal of different end structures is theoretically analyzed and simulated.The coupling of electrodes and the influence of signal carrier size,which may influence the induced signal,are also discussed.Finally,the linearity of the induced voltage and the sensitivity of the WPM are analyzed.The time domain simulation results are consistent with the theoretical analysis.The influences of the coupling and carrier size are very small,and the linearity of the normalized voltage is good within r/2. 相似文献
15.
在多脉冲强流直线感应加速器(LIA)的测控和诊断系统中,电子束的在线测试数据处理是重要的组成部分。多脉冲强流电子束在线测试数据处理系统是集测试仪器、计算机和工作站等组成的工业以太网,以及实现测试网络配置、测试仪器的通信及控制、数据采集、束流强度和束质心位置计算、显示以及存储等功能为一体的专用软件。多脉冲强流电子束采用基于电阻环束流位置检测器(BPM)的束流测试线路,根据束线上每个BPM测试得到的四个象限点的原始电压信号波形,以及测试线路的结构参数,计算束线上每个PBM位置的束流强度以及束质心位置随时间变化的波形,根据随时间变化的波形数据计算每个BPM位置多个脉冲束流的强度以及束质心位置的统计数据。数据的存储采用SQL和文件系统相结合的方式。这套多脉冲强流电子束在线数据处理系统在多脉冲强流LIA的调试实验中稳定可靠运行,为实验提供有效可靠的数据。 相似文献
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