Four types of magnetic alloy cores,labeled as V1,V2,A1 and A2,were produced by Liyuan Corp.Ltd.,for the radio frequency compression cavity of HIRFL-CSRm.In this work,their permeability,quality factor (Q value) and shu...Four types of magnetic alloy cores,labeled as V1,V2,A1 and A2,were produced by Liyuan Corp.Ltd.,for the radio frequency compression cavity of HIRFL-CSRm.In this work,their permeability,quality factor (Q value) and shunt impedance were measured before installing them into the cavity.The results show that the V1,V2 and A2 have higher permeability and shunt impedance,and lower Q value,and are suitable to the radio frequency compression cavity.展开更多
There is a definite requirement of high vacuum degree in synchrotron accelerator. According to a study[1], the static LEAR vacuum pressure was about 510?12 Torr, but local pressure bumps up to 10?9 Torr occurred duri...There is a definite requirement of high vacuum degree in synchrotron accelerator. According to a study[1], the static LEAR vacuum pressure was about 510?12 Torr, but local pressure bumps up to 10?9 Torr occurred during continuous injection of about 108 ions/s. A dynamic pressure increase was attributed to the outgassing of vacuum equipment due to the impact of lost ions. The ion-induced desorption can seriously limit the ion intensity, luminosity, and beam lifetime of the accelerator.展开更多
To improve the efficiency of Electron Cooling Control System of CSRm, power supplies control system was designed and set up in September 2015. The control software package is developed with Visual C++, which is able t...To improve the efficiency of Electron Cooling Control System of CSRm, power supplies control system was designed and set up in September 2015. The control software package is developed with Visual C++, which is able to control and monitor all power supplies. In order to prevent the power supplies’ leakage accident which may cause the breakdown of other device, alarm and interlock-protection functions are added to the software and hardware.展开更多
The total recombination rate coefficient of Phosphorus-like 112Sn35+ have been measured at the main cooler storage ring (CSRm) employing the electron-ion merged-beams technique. The Phosphorus-like 112Sn35+ ions were ...The total recombination rate coefficient of Phosphorus-like 112Sn35+ have been measured at the main cooler storage ring (CSRm) employing the electron-ion merged-beams technique. The Phosphorus-like 112Sn35+ ions were injected into the CSRm at an energy of 3.7 MeV/u with a typical current of 50 eA, and the momentum spread of the ion beam is 210?4 after several seconds of cooling.展开更多
Great progress was achieved in CSRm vacuum system in the year of 2004. All of the components have been fixed to the system. After mechanic adjustment, baking-out on line, average vacuum degree of CSRm was up to better...Great progress was achieved in CSRm vacuum system in the year of 2004. All of the components have been fixed to the system. After mechanic adjustment, baking-out on line, average vacuum degree of CSRm was up to better than 5×10-10 Pa. In this paper, the mechanic installation and adjustment, fix of baking system, process of pumping and result are introduced.展开更多
The internal targets used in the storage ring are quite promising targets due to the well defined reaction vertex, low background and undisturbed reaction products. Light-isotope targets, such as hydrogen and deuteriu...The internal targets used in the storage ring are quite promising targets due to the well defined reaction vertex, low background and undisturbed reaction products. Light-isotope targets, such as hydrogen and deuterium, are the most favorite candidates for hadron physics study. For physical experiments, the figure of merit is usually the luminosity, and it is found that the frozen micro-spheres (called pellets) could provide a high luminosity which is comparable to that of an external target, whereas the conventional gas targets can not reach this criterion because of the heavy gas load in the reaction chamber. A global detector with nearly '4 configuration can be arranged around the pellet target. In the near future, a pellet target facility with global detectors is foreseen at CSRm in Lanzhou.展开更多
A pellet target facility with global detectors will be constructed at CSRm, Lanzhou for hadron physics research. The pellet diameter ranges from 25 to 35 μm, and thus an effective target thickness of 1015 - 1016 atom...A pellet target facility with global detectors will be constructed at CSRm, Lanzhou for hadron physics research. The pellet diameter ranges from 25 to 35 μm, and thus an effective target thickness of 1015 - 1016 atoms/cm2 is expected. The number of stored particles in CSRm is estimated to be 1×109 particles per cycle with the existing accelerator(s) as the injector. With the aid of a planned booster as the injector, the maximum stored particles per cycle can be elevated to 1×1012. The revolution frequency is typically in the order of 1 MHz for the present CSRm ring with a circumference of 161.0 m. With the new booster, a maximum experimental luminosity for pellet target is estimated to be 1×1034/(cm2·s).展开更多
Schottky signal analysis plays an important role in the HIRFL-CSR beam diagnostic system. The beam dynamic characteristic in the cooling storage ring is measured with the schottky probes. The relative momentum spread...Schottky signal analysis plays an important role in the HIRFL-CSR beam diagnostic system. The beam dynamic characteristic in the cooling storage ring is measured with the schottky probes. The relative momentum spreadΔp/p of the beam, the value of the tune Q, the revolution frequency of particles along the ring circumference and particle number can be acquired by the Schottky signal. Two Schottky展开更多
The project of the HIRPL-CSR is being done and the CSRm vacuum system was finished in March 2004. In order to meet the requirement of the beam storage time in HIRFL-CSR storage ring, the average vacuum degree of 6...The project of the HIRPL-CSR is being done and the CSRm vacuum system was finished in March 2004. In order to meet the requirement of the beam storage time in HIRFL-CSR storage ring, the average vacuum degree of 6×10-9 Pa is requested in the ultra-high vacuum system. To reach the target, the vacuum baking-out system must be set up on the system so as to make it baked to about 250℃after the system being exposed to the atmosphere. The vacuum baking-out system main by consists of the thermal sensors, heating jackets (Fig.1), baking-out control system and so on.展开更多
The radiation monitoring system of HIRFL-CSRm was composed of neutron and 7 detector, data acquisition and procession system(Fig.1). Fig.2 gives the monitoring sites distribution layout of HIRFL-CSRm. The data obtaine...The radiation monitoring system of HIRFL-CSRm was composed of neutron and 7 detector, data acquisition and procession system(Fig.1). Fig.2 gives the monitoring sites distribution layout of HIRFL-CSRm. The data obtained from detectors were input into a local computer through a PCL-836 counter card, at where the data were processed and the dose rate was obtained. The processed data were upload to the local network, a展开更多
CSRm injection beam line is the transitional section between HIRFL post beam line and CSRm. HIRFL post beam line's vacuum degree is about 10-6 Pa and CSRm's designed average pressure is 6×10-9 Pa, so CSRm...CSRm injection beam line is the transitional section between HIRFL post beam line and CSRm. HIRFL post beam line's vacuum degree is about 10-6 Pa and CSRm's designed average pressure is 6×10-9 Pa, so CSRm injection beam line is a very important section which must finish three order of magnitudes pressure transition from 10-9 to 10-6 Pa.展开更多
基金Supported by Innovation Research Community of National Natural Science Foundation of China(10921504)
文摘Four types of magnetic alloy cores,labeled as V1,V2,A1 and A2,were produced by Liyuan Corp.Ltd.,for the radio frequency compression cavity of HIRFL-CSRm.In this work,their permeability,quality factor (Q value) and shunt impedance were measured before installing them into the cavity.The results show that the V1,V2 and A2 have higher permeability and shunt impedance,and lower Q value,and are suitable to the radio frequency compression cavity.
文摘There is a definite requirement of high vacuum degree in synchrotron accelerator. According to a study[1], the static LEAR vacuum pressure was about 510?12 Torr, but local pressure bumps up to 10?9 Torr occurred during continuous injection of about 108 ions/s. A dynamic pressure increase was attributed to the outgassing of vacuum equipment due to the impact of lost ions. The ion-induced desorption can seriously limit the ion intensity, luminosity, and beam lifetime of the accelerator.
文摘To improve the efficiency of Electron Cooling Control System of CSRm, power supplies control system was designed and set up in September 2015. The control software package is developed with Visual C++, which is able to control and monitor all power supplies. In order to prevent the power supplies’ leakage accident which may cause the breakdown of other device, alarm and interlock-protection functions are added to the software and hardware.
文摘The total recombination rate coefficient of Phosphorus-like 112Sn35+ have been measured at the main cooler storage ring (CSRm) employing the electron-ion merged-beams technique. The Phosphorus-like 112Sn35+ ions were injected into the CSRm at an energy of 3.7 MeV/u with a typical current of 50 eA, and the momentum spread of the ion beam is 210?4 after several seconds of cooling.
基金Support by WTZ project of BMBF, German Government.
文摘Great progress was achieved in CSRm vacuum system in the year of 2004. All of the components have been fixed to the system. After mechanic adjustment, baking-out on line, average vacuum degree of CSRm was up to better than 5×10-10 Pa. In this paper, the mechanic installation and adjustment, fix of baking system, process of pumping and result are introduced.
文摘The internal targets used in the storage ring are quite promising targets due to the well defined reaction vertex, low background and undisturbed reaction products. Light-isotope targets, such as hydrogen and deuterium, are the most favorite candidates for hadron physics study. For physical experiments, the figure of merit is usually the luminosity, and it is found that the frozen micro-spheres (called pellets) could provide a high luminosity which is comparable to that of an external target, whereas the conventional gas targets can not reach this criterion because of the heavy gas load in the reaction chamber. A global detector with nearly '4 configuration can be arranged around the pellet target. In the near future, a pellet target facility with global detectors is foreseen at CSRm in Lanzhou.
文摘A pellet target facility with global detectors will be constructed at CSRm, Lanzhou for hadron physics research. The pellet diameter ranges from 25 to 35 μm, and thus an effective target thickness of 1015 - 1016 atoms/cm2 is expected. The number of stored particles in CSRm is estimated to be 1×109 particles per cycle with the existing accelerator(s) as the injector. With the aid of a planned booster as the injector, the maximum stored particles per cycle can be elevated to 1×1012. The revolution frequency is typically in the order of 1 MHz for the present CSRm ring with a circumference of 161.0 m. With the new booster, a maximum experimental luminosity for pellet target is estimated to be 1×1034/(cm2·s).
文摘Schottky signal analysis plays an important role in the HIRFL-CSR beam diagnostic system. The beam dynamic characteristic in the cooling storage ring is measured with the schottky probes. The relative momentum spreadΔp/p of the beam, the value of the tune Q, the revolution frequency of particles along the ring circumference and particle number can be acquired by the Schottky signal. Two Schottky
文摘The project of the HIRPL-CSR is being done and the CSRm vacuum system was finished in March 2004. In order to meet the requirement of the beam storage time in HIRFL-CSR storage ring, the average vacuum degree of 6×10-9 Pa is requested in the ultra-high vacuum system. To reach the target, the vacuum baking-out system must be set up on the system so as to make it baked to about 250℃after the system being exposed to the atmosphere. The vacuum baking-out system main by consists of the thermal sensors, heating jackets (Fig.1), baking-out control system and so on.
文摘The radiation monitoring system of HIRFL-CSRm was composed of neutron and 7 detector, data acquisition and procession system(Fig.1). Fig.2 gives the monitoring sites distribution layout of HIRFL-CSRm. The data obtained from detectors were input into a local computer through a PCL-836 counter card, at where the data were processed and the dose rate was obtained. The processed data were upload to the local network, a
基金Support by WTZ project of BMBF, Gennan Government.
文摘CSRm injection beam line is the transitional section between HIRFL post beam line and CSRm. HIRFL post beam line's vacuum degree is about 10-6 Pa and CSRm's designed average pressure is 6×10-9 Pa, so CSRm injection beam line is a very important section which must finish three order of magnitudes pressure transition from 10-9 to 10-6 Pa.
