[en] A magnetically filtered multicusp negative hydrogen ion source has been tested on the RFQ-1 preinjector at CERN in anticipation of injection of H^- beams into the LEAR machine. Although the source is remarkably simple in concept, its operation in the short pulse mode (> 10 μs) has proved to be somewhat more complicated due to a long formation time of the negative ions. For a 150 μs long discharge of 230 A, a maximum of 5 mA of H^- has been accelerated to 520 keV in unoptimized conditions

[en] An accident at the nuclear power station in Chernobyl, near Kiev, USSR on 26 April 1986 caused substantial quantities of radioactive material to be released into the atmosphere. Winds transported some of the material towards northern and western Europe. Radioactivity from Chernobyl was detected in the United Kingdom, 2000 km away, almost a week later on 2 May. Government Departments, the National Radiological Protection Board, and the operators of nuclear installations had anticipated this eventuality and from 28 April intensified their normal programmes of environmental monitoring. DOE established a Technical Information Centre in the Incident Control Room at the Marsham Street Headquarters, which was manned by representatives of DTp, MAFF, DHSS, NRPB with DOE taking the lead and providing administrative support. Close links were maintained with other operational centres including those in the Scottish, Welsh and Northern Ireland Offices. Ten bulletins were issued by the Centre and two collations of monitoring data were prepared and made available to the public. These monitoring data had been compiled by the National Radiological Protection Board and are subsumed in this document. Monitoring of environmental materials is continuing as necessary. For example, the Ministry of Agriculture, Fisheries and Food has a programme for measuring radioactivity in a wide range of foodstuffs; it has already published results and intends to publish more

[en] The performance of over 20 surface contamination monitors commonly used by operators and regulators in the United Kingdom has been evaluated, including some newly developed instruments. All the instruments have been subjected to a wide range of tests, and performance ratings assigned. The suitability of instruments for demonstrating compliance with the Ionising Radiations Regulations 1985 has been assessed, and technical aspects of the design and performance are discussed. (author)

[en] The 14.5 GHz ECR4 source supplied to CERN in the framework of the Heavy Ion Facility collaboration provided Pb²⁷⁺ operational beams to a new custom built linac in 1994. This source, which operates in the pulsed 'afterglow' mode, quickly met its design specification of 80 eμA and now provides currents >100 eμA regularly. Early source tests showed the existence of extremely stable modes of operation. In the search for higher intensities a number of experiments have been performed on plasma gas composition, RF power matching, extraction, beam pulse compression and a biased dynode. The results of these tests will be presented along with further ideas to improve source performance. (author)

[en] The CERN Intersecting Storage Rings (ISR) have been successfully operated with sufficient /alpha/ particles for experiments at total center of mass energies up to 120 GeV. Initially, the small beam currents obtainable from the (old) Linac hampered machine studies with the PS so that conclusive experiments similar to those done with deuterons were not possible. Recent attempts to increase the intensity by stripping a He⁺ beam at 520 keV succeeded and gave 10 mA of /alpha/ particles from the Linac. Multiturn injection and acceleration in the PS produced 2*10¹¹ particles/pulse and stacking in the ISR resulted in a maximum stored beam intensity of 4.2 A at 52 GeV. 5 refs

[en] Nonparenchymal cell suspensions were prepared by a modification of a method described previously and suspended in Krebs-Henseleit buffer containing 10% BSA. 1.74 x 10⁷ cells were incubated with 0.5nm ³H-AGEPC (0.2 uCi) at 37 degree C in triplicate. At 1, 3, 5, 10, 60 min cells were separated from media by filtration. The lipids in both cellular and medium fraction were extracted and the different lipid components separated by TLC with appropriate standards. All zones were scraped and the radioactivity in each zone counted. Results showed that in the initial 5 min, the amount of radioactivity in lysoGPC zone increased rapidly (from 9% at 1 min to 18% at 5 min) with a concomitant decrease in ³H-AGEPC. However, the amount of lysoGPC was essentially unchanged after 5 min (20% at 60 min). In contrast, the amount of alkylacylGPC increased slowly and constantly. At 60 min, the amounts of lysoGPC and alkylacylGPC were almost equal (20.3% and 18%, respectively). LysoGPC accumulated primarily in the media, whereas alkylacylGPC was predominantly in the cellular fraction. The results suggest that rat nonparenchymal cells can take up AGEPC, hydrolyze it to lysoGPC and further acylated it to alkylacylGPC although at slower rate than in human and rabbit platelets as previously reported

[en] Future CERN programs for the large hadron collider (LHC) and the isotope online separator (ISOLDE) require increasing the beam intensity and brightness from the proton synchrotron booster (PSB). This could be achieved by charge-exchange injection with phase-space painting into the PSB acceptance from a higher energy H^- linac. A new injector will require a high performance, high reliability, negative hydrogen-ion source. This article will present the results achieved so far with a prototype microwave-driven source operated with three different magnetic structures (multicusp, solenoidal, and a combination of both). The experiments were carried out with different mixing gases, different chamber inserts, and under a wide range of operational conditions

[en] In fall 1994 the new heavy ion injector at CERN was brought into operation successfully and a lead beam of 2.9x10⁷ ions per pulse was accelerated in the SPS up to an energy of 157 GeV/u. The ion source, which was supplied by GANIL (France) was in operation almost continuously over a period of about one year and proved to be very reliable. It produces a current of more than 100 μA of Pb²⁷⁺ (after the first spectrometer) during the afterglow of the pulsed discharge. The current stays within 5% of the maximum value for a time of about 1 ms, which is more than required by the accelerators. Measurements of the charge state distribution, emittance and energy spread, which were made during this time window, are presented together with other operating data. (author)

No abstract available

[en] After 9 yr of delivering lead ions to the SPS fixed target physics program, a new beam was requested for the 2003 physics period, namely indium. The operational requirements and present status of the source will be presented together with the solutions to some of the problems experienced