Facility Of Antiproton And Ion Research Research Articles

Intense heavy ion beam-induced material evaporation and the resulting dynamic vacuum deterioration of the beam line

Abstract We studied the explosive evaporation of high energy density matter generated by irradiation of intense heavy ion beams and the resulting effect on the dynamic vacuum of the accelerator beamlines. High Energy Density Physics (HEDP) experiments are proposed at the plasma physics terminal at the Facility of Antiproton and Ion Research (FAIR), which is currently under construction. The target response to irradiation by intense beam was simulated by HEIGHTS (High Energy Interaction with General Heterogeneous Target Systems) simulation package. The vacuum deterioration resulting from the target evaporation was simulated with the Molflow+ Monte-Carlo simulator. Experimentally we measured the pressure wave propagation at the HTD beamline at GSI in order to benchmark the simulation. The pressure wave was generated through ohmic heating of a cold surface.

Quench calculations for the superconducting dipole magnet of CBM experiment at FAIR

The scientific mission of the Compressed Baryonic Matter (CBM) experiment is the study of the nuclear matter properties at the high baryon densities in heavy ion collisions at the Facility of Antiproton and Ion Research (FAIR) in Darmstadt. The 5.15 MJ superconducting dipole magnet will be used in the silicon tracking system of the CBM detector. It will provide a magnetic field integral of 1 Tm which is required to obtain a momentum resolution of 1% for the track reconstruction. This paper presents quench modeling and evaluation of candidate protection schemes for the CBM dipole magnet. Two quench programs based on finite-difference method were used in simulation. One of them is currently used at GSI, and the other based on CIEMAT (Madrid, Spain) was modified to perform quench calculation for the CBM magnet.

Antiproton chain of the FAIR storage rings

In the Modularized Start Version of the Facility of Antiproton and Ion Research (FAIR) at Darmstadt Germany, the 3 GeV antiprotons are precooled in the collector ring and accumulated in the high energy storage ring (HESR). They are further accelerated to 14 GeV or decelerated to 1 GeV for the experiments with a high-density internal target. The powerful beam cooling devices, stochastic cooling and electron cooling will support the provision of a high-resolution antiproton beam. The other option of FAIR is to prepare the low energy, 300 keV antiproton beam connecting the existing storage rings ESR and CRYRING with HESR. Beam physics issues related with these concepts are described.

Compressed baryonic matter at FAIR: JINR participation

The scientific mission of the Compressed Baryonic Matter(CBM) experiment is the study of the nuclear matter properties at the high baryon densities in heavy ion collisions at the Facility of Antiproton and Ion Research (FAIR) in Darmstadt. We present the results on JINR participation in the CBM experiment. JINR teams are responsible on the design, the coordination of superconducting(SC) magnet manufacture, its testing and installation in CBM cave. Together with Silicon Tracker System it will provide the momentum resolution better 1[Formula: see text] for different configuration of CBM setup. The characteristics and technical aspects of the magnet are discussed. JINR plays also a significant role in the manufacture of two straw tracker station for the muon detection system. JINR team takes part in the development of new method for simulation, processing and analysis experimental data for different basic detectors of CBM.

The proton injector for the accelerator facility of antiproton and ion research (FAIR)

The new international accelerator facility for antiproton and ion research (FAIR) at GSI in Darmstadt, Germany, is one of the largest research projects worldwide and will provide an antiproton production rate of 7 × 10(10) cooled pbars per hour. This is equivalent to a primary proton beam current of 2 × 10(16) protons per hour. For this request a high intensity proton linac (p-linac) will be built with an operating rf-frequency of 325 MHz to accelerate a 35 mA proton beam at 70 MeV, using conducting crossed-bar H-cavities. The repetition rate is 4 Hz with beam pulse length of 36 μs. The microwave ion source and low energy beam transport developed within a joint French-German collaboration GSI/CEA-SACLAY will serve as an injector of the compact proton linac. The 2.45 GHz ion source allows high brightness ion beams at an energy of 95 keV and will deliver a proton beam current of 100 mA at the entrance of the radio frequency quadrupole (RFQ) within an acceptance of 0.3π mm mrad (norm., rms).

Proposal for studyingN*resonances with thep¯p→p¯nπ+reaction

A theoretical study of the $\overline{p}p\ensuremath{\rightarrow}\overline{p}n{\ensuremath{\pi}}^{+}$ reaction for antiproton beam energy from $1$ to $4$ GeV is made by including contributions from various known ${N}^{*}$ and ${\ensuremath{\Delta}}^{*}$ resonances. It is found that for the beam energy around $1.5$ GeV, the contribution of the Roper resonance ${N}_{(1440)}^{*}$ produced by the $t$-channel $\ensuremath{\sigma}$ exchange dominates over all other contributions. Since such a reaction can be studied in the forthcoming PANDA experiment at the GSI Facility of Antiproton and Ion Research (FAIR), the reaction will be realistically the cleanest place for studying the properties of the Roper resonance and the best place for looking for other ``missing'' ${N}^{*}$ resonances with large coupling to $N\ensuremath{\sigma}$.

The GSI Cryogenic Prototype Test Facility—First Experience Gained on 2-Phase-Flow Superconducting Prototype Magnets of the FAIR Project

The Facility of Antiproton and Ion Research (FAIR) will feature two superconducting fast ramped synchrotrons (SIS 100, SIS 300). The core components of this new facility are two-phase forced cooled superferric magnets ramped with 4 T/s up to 2 T and single-phase forced cooled costhetas magnets ramped with 1 T/s up to 4 T. The GSI test facility consists of 2 test benches. One of them is equipped with a universal cryostat and second one is dedicated to cryostated superconducting (SC) magnets. So far, one SC coil and one SC magnet have been tested. We report on the training, quench behavior of magnets and results of AC loss measurements.

Numerical Analysis of the Operation Parameters of Fast Cycling Superconducting Magnets

The 100 Tm heavy ion synchrotron SIS 100 is the core component of the Facility of Antiproton and Ion Research (FAIR). Prototype magnets were built last year with the first full scale dipole magnet completed and tested. Thorough R&D resulted in FEM models which allow calculating the magnetic field of the magnet during static and dynamic mode. We illustrate the R&D steps required for the FEM calculation. We illustrate its accuracy and describe the expected field quality and dissipated power.

Fast Ramped Superferric Prototypes and Conclusions for the Final Design of the SIS 100 Main Magnets

The 100 Tm synchrotron SIS 100 is the core component of the Facility of Antiproton and Ion Research (FAIR). An intensive R&D allowed reducing the AC losses considerably as well as improving the field quality. High priority was also given to the investigation of the mechanical stability of the superconducting coil to guarantee a long term life time of at least 20 years with more than 2middot108 operation cycles and to position the cable windings precisely. Prototype magnets were built last year with the first dipole magnet completed by Babcock Noell GmbH and currently being under preparation for intensive testing. After a brief description of the main R&D results the key features of three full scale dipoles and a quadrupole prototype are given as well as the expected heat load at 4 K for the 3 m long dipoles for the most important operation modes requested for the SIS100 accelerator. During prototyping additional, more intensive operation cycles were requested by beam dynamics and more cooling power by the vacuum requirements. The consequences for the cooling stability of the dipoles were estimated and preliminary tested on a hydraulic equivalent magnet system and will be verified by the upcoming measurements of the full size models. Necessary modifications for the series production are discussed and the actual chosen SIS100 dipole design fulfilling also the additional operation requirements is outlined.