A remote control system for the ECR ion source and LEBT device based on Siemens S7-300 PLC is introduced in the paper.A PROFIBUS-DP is used to exchange message between the host-computer and *** Machine Interface(HMI)i...
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A remote control system for the ECR ion source and LEBT device based on Siemens S7-300 PLC is introduced in the paper.A PROFIBUS-DP is used to exchange message between the host-computer and *** Machine Interface(HMI)is developed by Siemens WinCC software,with the functions of interlock,control,and data *** detail problems such as structure,reconstructing incontrollable equipment,hardware and software designing are presented.
To meet the requirements of developing SFRFQ and upgrading the 1 MeV ISR RFQ accelerator,an ECR O^+ ion source and LEBT system have been *** two Einzel Lenses to focus the beam,more than 3mA O^+ beam with the energy o...
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To meet the requirements of developing SFRFQ and upgrading the 1 MeV ISR RFQ accelerator,an ECR O^+ ion source and LEBT system have been *** two Einzel Lenses to focus the beam,more than 3mA O^+ beam with the energy of 22keV can be obtained at the end of *** normalized root-mean-square emittance is about 0.12πmm·mrad.
One should pay attention to quite a lot of factors when the emittance of high-current ion beam is measured. The background subtraction and threshold setting,the measuring method of pulsed beam emittance,as well as the...
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One should pay attention to quite a lot of factors when the emittance of high-current ion beam is measured. The background subtraction and threshold setting,the measuring method of pulsed beam emittance,as well as the error sources in the emittance measurements and its elimination or correction are discussed based on the experience during the R&D of three emittance measurement units for high-current ion beams at Peking University.
A new linear accelerating structure SFRFQ was proposed to transfer the RFQ inter-vane voltage to the inter-longitudinal accelerating gap voltage so as to improve the acceleration efficiency.A SFRFQ prototype is being ...
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A new linear accelerating structure SFRFQ was proposed to transfer the RFQ inter-vane voltage to the inter-longitudinal accelerating gap voltage so as to improve the acceleration efficiency.A SFRFQ prototype is being constructed to explore its feasibilities,which will be installed behind the 1MeV ISR RFQ and accelerates the O^+ beam from 1MeV to 1.6MeV.A high power SFRFQ model cavity was designed and tested,which has proved that an accelerating voltaire higher than 70kV could be applied.A magnetic triplet matching section was designed to realize the beam matching between 1MeV ISR RFQ and *** upgrading of 1MeV ISR RFQ has been carried out smoothly, and its output beam current has reached 2mA.
RF superconducting cavities can work in CW mode or long pulse *** superconducting technology is widely used in particle *** development of RF superconductivity is limited by the material,surface treatment and *** tech...
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RF superconducting cavities can work in CW mode or long pulse *** superconducting technology is widely used in particle *** development of RF superconductivity is limited by the material,surface treatment and *** technology is improved greatly after dozens of years'*** of techniques and experiences have been accumulated by running superconducting *** recent years,researches and developments have been carried out for future large scientific *** cavity shape and superconducting cavities made of large grain niobium are the hot frontiers in SRF *** Recovery Linacs have been developed in recent *** has many advantages such as high efficiency,energy saving,good stability,low radiation level,*** are more and more used in advanced light sources and free electron laser facilities.
This paper presents new beam test results for O^+ beam on a high current Integral Split Ring Radio Frequency Quadruple(ISR RFQ)*** the upgrading,a new designed 2.45GHz O^+ ECR Ion Source can provide a beam with macro-...
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This paper presents new beam test results for O^+ beam on a high current Integral Split Ring Radio Frequency Quadruple(ISR RFQ)*** the upgrading,a new designed 2.45GHz O^+ ECR Ion Source can provide a beam with macro-puise peak current of 4mA at the injection point behind a 15ram diaphragm,whose O^+ factor is 60%—80% varied with gas flow rate and the normalized rms emittance is less than 0.15πmm·*** accelerated O^+ beam current goes up to 2mA with the transmission of about 80% at 45kW RF power with duty factor 1/6(pulse duration of 1ms and repetition frequency of 166Hz).The upgraded RF power system includes low level RF pulse modulation amplifier,AGC,3W and 20W preamplifiers,1kW driver and 30kW final amplifier,which can output nearly 50kW in pulsed *** vacuum has been improved,*** upgraded 1MeV ISR RFQ can be used as the beam injector of a new designed SFRFQ accelerating system,which is under the construction at Peking University.
Researches on large grain superconducting cavities are carried out at SRF laboratory of Peking University. A 1.3GHz TESLA type single cell cavity and a 1.3GHz 2-cell cavity made of large grain niobium were fabricated ...
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Researches on large grain superconducting cavities are carried out at SRF laboratory of Peking University. A 1.3GHz TESLA type single cell cavity and a 1.3GHz 2-cell cavity made of large grain niobium were fabricated by Peking *** the collaboration of Jlab,the measured Eacc of the single-cell cavity reached 43.5MV/m after BCP,baking and high temperature heat treatment.
探寻量子色动力学(Quantum Chromodynamics,QCD)相图的临界点是相对论重离子碰撞实验低能量扫描(Beam Energy Scan program in Relativistic Heavy-Ion Collisions,RHIC-BES)项目的重要实验目标。初步的实验探测发现了净质子数涨落随着...
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探寻量子色动力学(Quantum Chromodynamics,QCD)相图的临界点是相对论重离子碰撞实验低能量扫描(Beam Energy Scan program in Relativistic Heavy-Ion Collisions,RHIC-BES)项目的重要实验目标。初步的实验探测发现了净质子数涨落随着对撞能量的非单调行为,定性上符合基于静态模型的理论预言,这暗示着QCD临界点的存在。由于相对论重离子碰撞是一个高速膨胀的体系,动力学效应能显著地改变QCD临界点附近的临界涨落。为最终确定QCD临界点的存在以及研究QCD在有限温有限密区域的相结构,人们发展了一系列QCD临界点附近的动力学模型。本文回顾了近年来关于寻找QCD临界点在实验测量和理论模型的进展,着重强调在临界点及一级相变区域动力学模型的发展和挑战。
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