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A Brief Presentation of Lanzhou Penning Trap Control System
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">LPT (Lanzhou Penning Trap) is an ion-trap facility in Lanzhou, China. As ions can be cooled to an extremely small phase space and can be stored for a very long time, ion traps are a perfect instrument for high precision mass measurements. A system with specialized electronics for LPT is under construction now. This system could be used for voltage and timing control to make ions moving in a special mode, and the data acquisition and analysis online/offline could be achieved in the mean time. The requirements of control system, the distribution of hardware, the overview of software, and the latest progress of LPTCtrlSys (Lanzhou Penning Trap Control System) are presented.</span
Projectile fragmentation reactions of Ar-40 at 57 MeV/nucleon
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">The projectile fragmentation reactions of Ar-40 at 57 MeV/nucleon on Be-9 and Ta-181 targets have been studied by the Radioactive Ion Beam Line in Lanzhou (RIBLL) at the Heavy-Ion Research Facility in Lanzhou (HIRFL). The momentum distributions of fragments have been measured and the competition between different mechanisms are observed. The production cross sections have been obtained and compared with the empirical parametrization of fragmentation cross section (EPAX), abrasion-ablation (AA), and heavy-ion phase space exploration (HIPSE) models, and the target dependence of fragment cross sections has also been discussed</span
Results of carbon ion radiotherapy for skin carcinomas in 45 patients
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">Background Heavy ions represent the best tool for external radiotherapy (RT) of inoperable tumours. Heavy ion RT has been used in the treatment of various tumours, especially for radioresistant tumours mediated by hypoxia, localized near organs at risk. Most of these treatments are concentrated in deep-seated tumours such as those of the brain, head, lung, liver, rectum and urogenital organs, and treatment of skin carcinomas is limited. </span><br style="margin: 0px; list-style: none; padding: 0px; color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);" />
<br style="margin: 0px; list-style: none; padding: 0px; color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);" />
<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">Objectives To evaluate the outcome and toxicity after carbon ion RT for skin carcinomas at the Heavy Ion Research Facility in Lanzhou, China. </span><br style="margin: 0px; list-style: none; padding: 0px; color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);" />
<br style="margin: 0px; list-style: none; padding: 0px; color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);" />
<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">Methods Between November 2006 and March 2009, 45 patients with skin carcinoma [squamous cell carcinoma (SCC) (n = 16), basal cell carcinoma (BCC) (n = 12), malignant melanoma (MM) (n = 7), Bowen disease (n = 8) and Paget disease (n = 2)] were treated with carbon ion RT within a clinical Phase I trial. Patients received total doses of 60-70 GyE for SCC and BCC, 61-75 GyE for MM, 60 GyE for Bowen disease and 42 5 GyE for Paget disease, administered in 6-11 fractions over 6-11 days, with a fraction dose of 7-10 GyE. </span><br style="margin: 0px; list-style: none; padding: 0px; color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);" />
<br style="margin: 0px; list-style: none; padding: 0px; color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);" />
<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">Results The mean follow-up was 24 months, range 12-36 months. The actuarial local control rates at 1 and 3 years were 90.9% and 65.5% for SCC, 91.7% and 80.2% for BCC, 85.7% and 42.9% for MM, 90% and 90% for Bowen and Paget diseases, respectively. The actuarial 1- and 3-year overall survival rates for 45 patients were 88 9% and 86%, respectively. No severe side-effects greater than Common Toxicity Criteria grade 3 have been observed. </span><br style="margin: 0px; list-style: none; padding: 0px; color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);" />
<br style="margin: 0px; list-style: none; padding: 0px; color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);" />
<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">Conclusions The results demonstrated that heavy ion RT offers high local tumour control and progression-free survival rates without significant radiation-induced toxicity for patients with skin carcinomas.</span
应用于离子加速器治癌的数字电源同步系统
No full text本实用新型涉及一种应用于离子治癌加速器等种拓扑类型的高精度数字电源脉冲运行同步系统。一种应用于离子加速器治癌的数字电源同步系统，包括FPGA芯片，用于连接以太网的RJ45接口，将光信号转化为数字信号的光纤接收器，所述的FPGA芯片依次通过用以实现FPGA芯片与远程计算机的网络通信的以太网芯片、网络变压器与所述的RJ45接口相连接，所述的FPGA芯片还依次通过数字隔离电路、单稳态多谐振荡器与光纤接收器相连接；FPGA芯片还与脉冲宽度调制信号输出通道模块相连接。本实用新型能实现离子治癌加速器二极铁、四极铁、六极铁等多种拓扑类型数字电源的脉冲波形触发和波形切换，以及离子治癌加速器数字电源系统中多台电源的同步启动
Thresholds for kinetic and potential energies of Arq+ induced Au target atomic M-alpha-X rays emission
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">The X ray emissions from Arq+ (the kinetic energy 150 keV and 1.2 MeV) beams impinging on Au surface are measured. The results show that the about 2 keV minimum-potential energy of Ar11+ and Ar12+ (150 keV) is necessary for exciting Au atoms to emit M-alpha-X rays. The kinetic energy threshold for exciting target atomic X ray emission is estimated by the semiclassical approximation theory of binary collision.</span
Progress of dielectronic recombination experiment at CSRm
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">An electron beam energy detuning system has been installed to the electron cooler device at the cooler storage ring in Lanzhou. The system is tested by using 7 MeV/u C6+ beam. The detuning system is feasible for future dielectronic recombination experiments.</span
Observation of the Superheavy Nuclide ~(271)Ds
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">With the recent commissioning of a gas-filled recoil separator at Institute of Modern Physics (IMP) in Lanzhou, the decay properties of (271)Ds (Z = 110) were studied via the Pb-208(Ni-64, n) reaction at a beam energy of 313.3MeV. Based on the separator coupled with a position sensitive silicon strip detector, we carried out the energy-position-time correlation measurements for the implanted nucleus and its subsequent decay alpha's. One alpha-decay chain for (271)Ds was established. The.. energy and decay time of the (271)Ds nucleus were measured to be 10.644 MeV and 96.8 ms, which are consistent with the values reported in the literature</span
A cw high charge state heavy ion rfq accelerator for ssc-linac injector
No full textA new linear injector called SSC-LINAC has been proposed to replace the Sector Focusing Cyclotron (SFC) for the Separator Section Cyclotron (SSC) and Cooling Storage Ring (CSR) of the Heavy Ion Research Facility of Lanzhou (HIRFL). Ions with ratio of mass to charge up to 7 are accelerated in the SSC-LINAC. The design research on a CW 53.667MHz RFQ accelerator will be presented. The beam dynamic design is based on 238U34+ beams with intensity of 0.5pmA. The inter-vane voltage is 70kV with the maximum modulation factor of 1.93. It uses a 2.5m long 4-rod structure to accelerate uranium ions from 3.728keV/u to 143keV/u with the transmission efficiency of 94%. The effect of different manufacturing crafts on beam dynamics has been checked. The specific shunt impedance has been optimized to 232.9kΩm. The water cooling system and design of the cavity tuning are also included in this paper. Copyright © 2012 by IEEE.(5 refs
Simulation of a low energy beam transport line
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">A 2.45 GHz electron cyclotron resonance intense proton source and a low energy beam transport line with dual-Glaser lens were designed and fabricated by Institute of Modern Physics for a compact pulsed hadron source at Tsinghua. The intense proton beams extracted from the ion source are transported through the transport line to match the downstream radio frequency quadrupole accelerator. Particle-in-cell code BEAMPATH was used to carry out the beam transport simulations and optimize the magnetic field structures of the transport line. Emittance growth due to space charge and spherical aberrations of the Glaser lens were studied in both theory and simulation. The results show that narrow beam has smaller aberrations and better beam quality through the transport line. To better match the radio frequency quadrupole accelerator, a shorter transport line is desired with sufficient space charge neutralization.</span