The Acceleration and Storage of Radioactive Ions for a Beta-Beam Facility

Charge Breeding of Radioactive Ions

Charge breeding is a technique to increase the charge state of ions, in many cases radioactive ions. The singly charged radioactive ions, produced in an isotope separator on-line facility, and extracted with a low kinetic energy of some tens of keV, are injected into a charge breeder, where the charge state is increased to Q. The transformed ions are either directed towards a dedicated experiment requiring highly charged ions, or post-accelerated to higher beam energies. In this paper the physics processes involved in the production of highly charged ions will be introduced, and the injection …

Nuclear Spectroscopy of Radioactive Strontium-94

Traditionally, the production of neutron-rich nuclei in laboratories has been impossible. However, with the accelerator facilities now available at the ATLAS facility of Argonne National Laboratory, there is now a unique opportunity for the study of such nuclei. By studying how the Rb-94 nucleus decays and releases energy, there has been a potential to update the currently accepted information, with further applications in nuclear astrophysics and nuclear reactor dynamics.

Beta Beams Implementation at CERN

Beta Beam,the concept of generating a pure and intense (anti) neutrino beam by letting accelerated radioactive ions beta decay in a storage ring, called Decay Ring (DR), is the base of one of the proposed next generation neutrino oscillation facilities, necessary for a complete study of the neutrino oscillation parameter space. Sensitivities of the unknown neutrino oscillation parameters depend on the Decay Ring's ion intensity and of it's duty factor (the filled ratio of the ring). Therefore efficient ion production, stripping, bunching, acceleration and storing are crucial sub-projects under…

An RFQ injection system for the HRIBF

At the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory (ORNL), molecular ions extracted from a positive ion source and subsequently broken up in a charge exchange cell produce Radioactive Ion Beams (RIBs) with several hundred eV energy spread, preventing effective magnetic isobar separation. In order to perform magnetic isobar separation prior to charge exchange, a multi-harmonic buncher and a 12 MHz RFQ (Radio-Frequency Quadrupole) is proposed to supplement the present 300 kV injection system for the 25 MV tandem electrostatic accelerator. The RFQ will be moun…

GANIL Status report

The GANIL-Spiral facility (Caen, France) is dedicated to the acceleration of heavy ion beams for nuclear physics, atomic physics, radiobiology and material irradiation. The production of radioactive ion beams for nuclear physics studies represents the main part of the activity. The facility possesses a versatile combination of equipments, which permits to produce accelerated radioactive ion beams with two complementary methods: Isotope Separation In Line (ISOL) and In-Flight Separation techniques (IFS). Considering the future of GANIL, SPIRAL II projects aims to produce high intensity secondar…

HIRFL-CSR装置中RIBLL2分离器的全面实现

Full realization of the RIBLL2 separator at the HIRFL-CSR facility

本研究在兰州HIRFL-CSR的RIBLL2上构建了新实验平台，通过400 MeV/u 40Ar和350 MeV/u 78Kr束流实验测试了其及新探测器的性能，结果证实了RIBLL2分离器的全面实现。

Collective Effect Studies of a Beta Beam Decay Ring

The Beta Beam, the concept of generating a pure and intense (anti) neutrino beam by letting accelerated radioactive ions beta decay in a storage ring called the Decay Ring (DR), is the basis of one of the proposed next generation neutrino oscillation facilities, necessary for a complete study of the neutrino oscillation parameter space. Sensitivities of the unknown neutrino oscillation parameters depend on the DR's ion intensity and of its duty factor (the filled ratio of the ring). Different methods, including analytical calculations and multiparticle tracking simulations, were used to estima…

The Neutrino Factory and Beta Beam Experiments and Development

The long-term prospects for fully exploring three-flavor mixing in the neutrino sector depend upon an ongoing and increased investment in the appropriate accelerator R&D. Two new concepts have been proposed that would revolutionize neutrino experiments, namely the Neutrino Factory and the Beta Beam facility. These new facilities would dramatically improve our ability to test the three-flavor mixing framework, measure \textsl{CP} violation in the lepton sector, and perhaps determine the neutrino mass hierarchy, and, if necessary, probe extremely small values of the mixing angle $θ_{13}$. The st…

通过产额测量与模拟理解ISAC的放射性离子束产生过程

Understanding radioactive ion beam production at ISAC through yield measurements and simulations

本研究介绍新升级的TRIUMF同位素数据库，其整合产额测量数据与FLUKA、Geant4模拟结果，可用于ISAC设施的放射性离子束研发与实验规划，并以医学同位素155Tb为例说明应用。

超级陶粲装置的蟹腰相互作用区设计与集成

Crab-waist interaction region design and integration for the Super Tau-Charm Facility

本文针对超级陶粲装置（STCF）极低垂直beta函数导致的强非线性问题，提出一种模块化光学设计，通过局部色散校正、精确-I变换及优化beta函数等手段，有效抑制了非线性效应，实现了超300s的Touschek寿命并满足项目要求。

TITAN's Digital RFQ Ion Beam Cooler and Buncher, Operation and Performance

We present a description of the Radio Frequency Quadrupole (RFQ) ion trap built as part of the TITAN facility. It consists of a gas-filled, segmented, linear Paul trap and is the first stage of the TITAN setup with the purpose of cooling and bunching radioactive ion beams delivered from ISAC-TRIUMF. This is the first such device to be driven digitally, i.e., using a high voltage ($V_{pp} = \rm{400 \, V}$), wide bandwidth ($0.2 < f < 1.2 \, \rm{MHz}$) square-wave as compared to the typical sinusoidal wave form. Results from the commissioning of the device as well as systematic studies with stab…