Physics design for the C-ADS main linac based on two dif f erent injector design schemes

The China ADS（C-ADS） project proposes to build a 1000 MW Accelerator Driven sub-critical System around 2032. The accelerator will work in CW mode with 10 mA in beam current and 1.5 GeV in final beam energy. The linac is composed of two major sections： the injector section and the main linac section. There are two diferent schemes for the injector section. The Injector-scheme is based on a 325 MHz RFQ and superconducting spoke cavities of the same RF frequency and the Injector-scheme is based on a 162.5 MHz RFQ and superconducting HWR cavities of the same frequency. The main linac design will be diferent for diferent injector choices. The two diferent designs for the main linac have been studied according to the beam characteristics from the diferent injector schemes.

Single-bunch emittance dilution in the perfect ILC main linac

In the ILC （International Linear Collider） main linac, low emittance preservation is the most important issue for beam dynamics study. As the main sources of emittance dilution, the dispersive and wakefield effects were studied in this paper. The theoretical calculations and numerical simulations of these two effects on single-bunch emittance dilution, without any misalignment errors, are presented in detail.

Main linac lattice design and optimization for E_(cm)=1 TeV CLIC

The Compact Linear Collider （CLIC） is a future e＋e linear collider. The CLIC study concentrated on a design of center-of-mass energy of 3 TeV and demonstrated the feasibility of the technology. However, the physics also demands lower energy collision. To satisfy this, CLIC can be built in stages. The actual stages will depend on LHC results. Some specific scenarios of staged constructions have been shown in CLIC Concept Design Report （CDR）. In this paper, we concentrate on the main linac lattice design for Ecm=l TeV CLIC aiming to upgrade from E~.,=500 GeV CLIC and then to Ecru=3 TeV one. This main linac accelerates the electron or positron beam froth 9 GeV to 500 GeV. A primary lattice design based on the 3 TeV CLIC main linac design and its optimization based on the beam dynamics study will be presented. As we use the same design principles as 3TeV CLIC main linac, this optimization is basically identical to the 3 TeV one. All the simulations results are obtained using the tracking code PLACET.

Effects of machine errors on the ILC main linac

For a practical linac, the beam property is affected seriously by any machine imperfections. In this paper, the effects of several main errors in the ILC main linac, such as quadrupole misalignment, magnet strength error and cavity misalignment, were studied by a theoretical method. The tolerance for each error was also obtained. Comparison with the numerical simulation result is made and the agreement is quite good.

医科达Synergy医用电子直线加速器CON A故障分析与维修

目的本文通过分析医科达Synergy医用电子直线加速器主接触器CON A的联锁电路,说明主接触器CON A的吸合条件,介绍导致MAIN CON A联锁故障的可能原因及诊断方法,为维修工程师提供借鉴经验。方法当控制软件报MAIN CONA联锁故障时,先在维修模式检查主接触器CON A的状态,再通过分析主接触器CON A的联锁电路图,并利用电压表测量相应的测量点,找出故障位置,分析故障原因。结果如果两个测量点之间是断开状态,故障位置即在断开的两个测量点之间。结论根据故障现象,可通过理论分析和实际测量快速查找出MAIN CON A联锁故障的位置及原因,解决问题。