[en] Possibility of using liquid-argon and liquid-xenon ionization detectors as gamma spectroscopic instruments was investigated. Basic properties of liquid argon and xenon, owing to which they are applicable to solving the above-mentioned problem, are considered. The detector designs and their support systems (Dewar vacuum flask, gas regulation- and cleaning systems, electronic instrumentation) are described in detail. Experimental investigation of the detector characteristics has shown the energy resolution for liquid argon to be 3.2%, that for liquid xenon - 6% at 1 MeV energy. It is noncluded that using small amounts of OΛ2^-, NΛ2^-,HΛ2O impurities and spedeteccial cleaning methods it is possible to create position-sensitive tors based on Xe and Ar with a 1-2% energy resolution

[en] Liquid argon and liquid xenon are interesting media for liquid ionization detectors within the field of nuclear physics. The low W-value and the low Fano-factor predict energy resolutions close to that of semiconductor detectors. The high Z of LXe gives a γ-ray efficiency slightly higher than that of NaI(Tl). Furthermore, the possibility of making position sensitive detectors using both the scintillation pulse and the ionization pulse is challenging. However, no one has come close to achieving the predicted energy resolution. Several experiments have been done with LAr in order to try to understand whether this is due to electronegative impurities in the liquid, which captures the electrons or whether there is any other mechanism responsible for the poor energy resolution

[en] The rise-time of signals from a liquid Ar ionization detector are described. The preliminary experiments were performed using the electronic set-up shown. The first results are given

[en] CRYRING (Sweden) is an accelerator facility (synchrotron/storage ring) dedicated to low-energy research mainly using highly charged, heavy ions. The features of the main UHV components in the accelerator/storage ring of CRYRING are described. Using ion-pumps and NEG-pump modules, but without baking, a vacuum in the low 10^-11 mbar region has been achieved in the 52 m circumference ring. Following some modifications, it is expected that the design value, the low 10^-12 mbar region, will be reached. (R.P.) 7 refs.; 6 figs.; 1 tab

[en] The features of the vacuum system of the accelerator/storage ring CRYRING are described. Using NEG-pumps based on the St 707 getter developed by SAES Getters (Milan, Italy) of low temperature type activated at 300⁰C and operating at room temperature in combination with sputter ion-pumps, a pressure in the low 10^-11 mbar (N₂ eqv) region has been achieved without any bake-out of the vacuum system. The design value, 5x10^-12 mbar (N₂ eqv), is expected to be reached after a complete bake-out of the system at 300^oC. (author)

[en] CRYRING is a facility for research in atomic, molecular and nuclear physics using a cryogenic electron beam ion source, CRYSIS, together with an RFQ linear accelerator as injector into a synchrotron ring, which can be used both for acceleration, deceleration and storage of very highly charged, heavy ions. (CRYRING stands for CRYsis-synchrotron-RING, RFQ for Radio Frequency Quadrupole and CRYSIS for CRYogenic Stockholm Ion Source.) A lay-out of CRYRING in an available laboratory area is In the ring itself experiments with a circulating heavy ion beam and merged or crossed beams of electrons, laser-photons, neutrals and ions will be possible. Crossed ion beams will be available from a 400 kV accelerator. Injectors for negative (hydrogen) ions and electrons (intended for cooling as well as experiments) are included in the project. Regarding the extraction of accelerated heavy ions for nuclear and atomic spectroscopy, it should be emphasized that the project aims at very heavy ions (Xe-U) which will be energetic enough to overcome the Coulomb barrier of heavy target nuclei. The different injectors can be separately used for experiments when not in operation for CRYRING. It should also be emphasized that since CRYSIS is a pulsed ion source, beam-sharing will be simplified, making it possible to run two or perhaps even three different experiments simultaneously

[en] CRYRING is a facility for research in atomic, molecular and nuclear physics using a cryogenic electron beam ion source, CRYSIS, together with a RFQ linear accelerator as injector into a synchrotron ring, which can be used both for acceleration, deceleration and storage of very highly charged, heavy ions. (CRYRING stands for CRYsis-synchrotron-RING, RFQ for Radio Frequency Quadrupole and CRYSIS for CRYogenic Stockholm Ion Source.) A lay-out of CRYRING in an available laboratory area is shown. In the ring itself experiments with a circulating heavy ion beam and merged or crossed beams of electrons, laser-photons, neutrals and ions will be possible. Crossed ion beams will be available from a 400 kV accelerator. Injectors for negative (hydrogen) ions and electrons (intended for cooling as well as experiments) are included in the project. Regarding the extraction of accelerated heavy ions for nuclear and atomic spectroscopy, it should be emphasized that the project aims at very heavy ions (Xe-U) which will be energetic enough to overcome the Coulomb barrier of heavy target nuclei. The different injectors can be separately used for experiments when not in operation for CRYRING. It should also be emphasized that since CRYSIS is a pulsed ion source, beam-sharing will be simplified, making it possible to run two or perhaps even three different experiments simultaneously

[en] A measuring station has been built at the CRYRING heavy ion accelerator to test the Single Event Upset (SEU) phenomena in working Static RAM circuits. The setup extracts the beam using Rutherford scattering and the ions are monitored with a BaF₂ scintillator. SEU measurements have been performed for standard bulk CMOS memory circuits

[en] The electron cooler at CRYRING is now operating with a superconducting gun solenoid and an electron beam that is adiabatically expanded with a factor of up to 100. This paper describes the new gun solenoid and electron gun. It presents measurements made on longitudinal cooling forces with different expansion factors, electron densities, magnetic field strengths and beam alignments. It also presents studies of a transverse beam instability that appears when a misalignment is introduced between ion and electron beams. Finally, some measurements of dielectronic recombination that directly yield transverse and longitudinal electron temperatures are discussed

[en] Liquid argon and liquid xenon are interesting media for Liquid Ionization Detectors (LID). The high atomic number and the high density of liquid xenon result in a gamma-ray efficiency similar to that of NaI(Tl) crystals. At the same time, the W-value and the low Fano factor point at energy resolutions close to that of Ge(Li) spectrometers. However, no one has come close to achieving this predicted energy resolution. In order to try to understand the reason(s) for this discrepancy, several experiments have been carried out using both liquid argon and liquid xenon. For LAr a total energy resolution of 30.5 keV (41.7 keV) is obtained for the 481 keV (975 keV) K-conversion electrons. The energy resolution of LXe is 49 keV (65 keV) for the 570 keV (1064 keV) photopeak. The energy resolutions obtained are discussed with respect to their energy dependence. The influence of electro-negative impurities and recombination effects are discussed. The free carrier yield for 5.4 MeV alpha-particles and its dependence on the electrical field are reported for LXe. (orig.)