摘要:

A radioactive ion beam facility—in short a RIB facility—produces ions of short-lived nuclei and accelerates them to energies of 0.1&ellip;10 MeV per nucleon or even higher. In this process it is important that the resulting RIB beams are free from nuclei of neighboring isobars or of neighboring elements. This task requires the production and ionization of the nuclei of interest as well as separating them from all others with a high-mass resolving power and small-mass cross contaminations. When constructing such a facility it also is very important to find ways that allow the accelerated ions to be provided to different experiments at least quasi simultaneously. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.58993

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

Both diffusion and effusion in radioactive ion beam foil targets can be described mathematically by Fick’s Law of diffusion. An approximate solution to the equation with the appropriate boundary conditions is presented for the RIST geometry target. This solution is expressed in terms of the physical and geometrical properties of the target and ioniser: the diffusion constant of the foil material, the conductance and the dimensions of the target and ioniser. The results of fitting the equation to measured data are shown. The equation can be used to optimize the design of targets for different radioactive ion beams. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.58968

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

An on-line Radioactive Ion Beam (RIB) facility is being developed at NSC, New Delhi utilizing the existing 15 UD Pelletron accelerator and the recoil mass separator, HIRA in a new ion-optical mode. The primary beams from the accelerator will be used in inverse kinematics for the production of light RIB species such as7Be,8Li,13N,17F,18Ne,etc. These products are separated and transported by HIRA which will be operated in a new ion-optical mode specially tuned for excellent beam rejection and better transportation efficiency. The RIB particles are collected and focussed at the secondary target site with better intensity and optimal beam qualities (an intensity of about104–106&hthinsp;ppsand size ∼ 3 mm dia.). The facility is expected to be operational by the end of 1998. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.58994

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

In recent tests without beam, the Argonne 12 MHz split-coaxial radio-frequency quadrupole (RFQ) achieved a cw intervane voltage of more than 100 kV, the design operating voltage for the device. This voltage is sufficient for the RFQ to function as the first stage of a RIB injector for the Argonne Tandem Linear Accelerator System (ATLAS). Previously reported beam dynamics calculations for the structure predict longitudinal emittance growth of only a fewkeV⋅nsfor beams of mass 132 and above with transverse emittance of0.27&pgr;&hthinsp;mm⋅mrad(normalized). Such beam quality is not typical of RFQ devices. The work reported here is preparation for tests with beams of mass up to 132. Beam diagnostic stations are being developed to measure the energy gain and beam quality of heavy ions accelerated by the RFQ using the Dynamitron accelerator facility at the ANL Physics Division as the injector. Beam diagnostic development includes provisions for performing the measurements with both a Si charged-particle detector and an electrostatic energy spectrometer system. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.58995

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

An accelerator (MAFF) for the new Munich high flux reactor FRM-II is under design [1,2] in order to deliver intense beams of very neutron-rich fission fragments of up to1012particles per second with final energies between 3.7 and 5.9 MeV/u to perform experiments for the production of heavy elements [3]. To obtain an efficient acceleration in a short LINAC, charge breeding of the1+-ion beam from the reactor to aq/A⩾0.16is required. New measurements with an electron cyclotron resonance ion source (ECRIS) [4] have shown that the requirements for a low duty cycle LINAC (10&percent;) can be fulfilled by the ECRIS. To reach a high flexibility in the final energy with a small number of structures, new kinds of IH-structures are under development at the Munich tandem laboratory. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.58996

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

The ISAC radioactive beam facility under construction at TRIUMF includes a 500 MeV proton beam(I⩽100&mgr;A)impinging on a thick target, an on-line source, a mass-separator, an accelerator complex, and experimental areas. The accelerator chain includes a 35 MHz RF Quadrupole (RFQ) to accelerate beams ofA/q⩽30from 2 keV/u to 150 keV/u and a post-stripper, 105 MHz variable energy drift tube linac (DTL) to accelerate ions of3⩽A/q⩽6to a final energy from 0.15 to 1.5 MeV/u. The design concept and present status of the ISAC linear accelerator complex will be summarized. In particular, first rf and beam tests with the RFQ and the status of fabrication and testing of DTL components will be reported. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.58997

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

In the frame work of the Italian participation to the project of a high intensity proton facility for the energy amplifier and nuclear waste transmutations, LNL is involving in the design and construction of prototypes of the injection system of the 1 GeV linac that consists of a RFQ (5 MeV, 30 mA) followed by a 100 MeV linac. This program has been already financially supported and the work is actually in progress. In this context, the LNL has been proposed a project for the construction of a second generation facility for the production of radioactive ion beams (RIBs) by using the ISOL method. The final goal consists in the production of neutron rich RIBs with masses ranging from 80 to 160 by using primary beams of protons, deuterons and light ions with energy of 100 MeV and 100 kW power. This project is proposed to be developed in about 10 years from now and intermediate milestones and experiments are foreseen and under consideration for the next INFN five year plan (1999–2003). In such period of time is proposed the construction of a proton/deuteron accelerator of 10 MeV energy and 10 mA current, consisting of a RFQ (5 MeV, 30 mA) and a linac (10 MeV, 10 mA), and of a neutron area dedicated to the RIBs production, to the BNCT applications and to the neutron physics. Some remarks on the production methods will be presented. The possibility of producing radioisotopes by means of the fission induced by neutrons will be investigated and the methods of production of neutrons will be discussed. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.58998

出版商:AIP    

年代:1999

数据来源: AIP

摘要:

For the on-line production of a14O+ion beam, an integrated target—transfer line ion source system is now under development at LBNL.14Ois produced in the form of CO in a high temperature carbon target using a 20 MeV3Hebeam from the LBNL 88″Cyclotron via the reaction12C(3He,n)14O.The neutral radioactive CO molecules diffuse through an 8 m room temperature stainless steel line from the target chamber into a cusp ion source. The molecules are dissociated, ionized and extracted at energies of 20 to 30 keV and mass separated with a double focusing bending magnet. The different components of the setup are described. The release and transport efficiency for the CO molecules from the target through the transfer line was measured for various target temperatures. The ion beam transport efficiencies and the off-line ion source efficiencies for Ar,O2and CO are presented. Ionization efficiencies of 28&percent; forAr+,1&percent; for CO, 0.7&percent; forO+,0.33 forC+have been measured. ©1999 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.58999

出版商:AIP    

年代:1999

数据来源: AIP