[en] Photographs of construction taking place on the Holifield Heavy Ion Research Facility are shown

[en] The Holifield Heavy Ion Research Facility has been in routine operation since July 1982. Beams have been provided using both the tandem accelerator alone and a coupled mode in which the Oak Ridge Isochronous Cyclotron is used as an energy booster for tandem beams. The coupled mode has proved to be especially effective and has allowed us to provide a wide range of energetic beams for scheduled experiments. In this report we discuss our operational experience and recent development activities

[en] A high level language, CHIL, has been developed for use in processing event-by-event experimental data at the Holifield Heavy Ion Research Facility (HHIRF) using PERKIN-ELMER 3230 computers. CHIL has been fully integrated into all software which supports on-line and off-line histogramming and off-line preprocessing. CHIL supports simple gates, free-form-gates (2-D regions of arbitrary shape), condition test and branch statements, bit-tests, loops, calls to up to three user supplied subroutines and histogram generating statements. Any combination of 1, 2, 3 or 4-D histograms (32 megachannels max) may be recorded at 16 or 32 bits/channel. User routines may intercept the data being processed and modify it as desired. The CPU-intensive part of the processing utilizes microcoded routines which enhance performance by about a factor of two

[en] Activities surrounding the HHIRF and ORIC are reported. The status of the HHIRF project-phase I is described; experimental facilities, data acquisition, a CAMAC event handler, and users' activities are included. Studies regarding phase II of the project are summarized. Negative ion source development work concerned a modified Aarhus geometry source and an axial-geometry positive- or negative-ion source. Results of analysis of new measurements of the ORIC magnetic field are given. ORIC operations data are tabulated and discussed. 14 figures, 2 tables

[en] A single-crate CAMAC system was configured to control a negative ion source development facility at ORNL and control software was written for the crate microcomputer. The software uses inputs from a touch panel and a shaft encoder to control the various operating parameters of the test facility and uses the touch panel to display the operating status. Communication to and from the equipment at ion source potential is accomplished over optical fibers from an ORNL-built CAMAC module. A receiver at ion source potential stores the transmitted data and some of these stored values are then used to control discrete parameters of the ion source (i.e., power supply on or off). Other stored values are sent to a multiplexed digital-to-analog converter to provide analog control signals. A transmitter at ion source potential transmits discrete status information and several channels of analog data from an analog-to-digital converter back to the ground-potential receiver where it is stored to be read and displayed by the software

[en] Experiments are in progress at the Oak Ridge National Laboratory which are designed to select the most appropriate target materials for generating particular radioactive ion beams for the Holifield Radioactive, Ion Beam Facility (HRIBF). The 25-MV tandem accelerator is used to implant stable complements of interesting radioactive elements into refractory targets mounted in a high temperature FERIAD ion source which is on-line at the UNISOR facility. These experiments permit selection of the target material most appropriate for the rapid release of the element of interest, as well as realistic estimates of the efficiency of the FEBIAD source. From diffusion release data, information on the release times and diffusion coefficients can be derived. Diffusion coefficients for Cl implanted and diffused from Zr₃Si₃ and As, Br, and Se implanted into and diffused from Zr₃Ge₃ have been derived from the resulting intensity versus time profiles

[en] A description of the VICKSI computer-control system is given. It uses CAMAC modules as unique interface between accelerator devices and the computer. Through a high degree of standardisation only seven different types of CAMAC modules are needed to control the accelerator facility. The idea of having one module control one accelerator device minimizes the cabling and also the software requirements. The operation of the control system has proved to be very reliable causing less than 2% down time of the facility. (orig.)

[en] Design specificatons and performance of the VICKSI beam line are summarized

[en] The Holifield Heavy Ion Research Facility is a national resource which will serve a large number of nuclear and atomic physicists who expect to perform experiments which vary widely in type and complexity. Although much consideration must be given to the problem of rapid acquisition and processing of many-parameter data, an equal emphasis will be placed on operational simplicity and the standardization of hardware and software. Two ''active'' experimental counting areas and two or more ''setup'' areas are served by three remotely located Perkin-Elmer 8/32 computers which are interfaced to the user equipment by means of three CAMAC branch highways. Other equipment includes a large disk system, alphanumeric/graphic terminals and printer-plotters located in each of the counting areas

[en] A new frequency variable linear accelerator injector was installed. It accelerates charged ions of a ion source from 90 up to 360 keV/m. The new installation permits to obtain high intencity currents needed in solid state physics. The important scientific applications of ion beams (particle-solid state interactions, modification of materials, ion beam analysis, nuclear sounds, biology and medicin, solar energy, solar cells, semiconductors) are listed. (USA)