Development of a remote control console for the HHIRF 25-MV tandem accelerator

DOE Office of Scientific and Technical Information (OSTI.GOV)

Hasanul Basher, A.M.

1991-09-01

The CAMAC-based control system for the 25-MV Tandem Accelerator at HHIRF uses two Perkin-Elmer, 32-bit minicomputers: a message-switching computer and a supervisory computer. Two operator consoles are located on one of the six serial highways. Operator control is provided by means of a console CRT, trackball, assignable shaft encoders and meters. The message-switching computer transmits and receives control information on the serial highways. At present, the CRT pages with updated parameters can be displayed and parameters can be controlled only from the two existing consoles, one in the Tandem control room and the other in the ORIC control room. Itmore » has become necessary to expand the control capability to several other locations in the building. With the expansion of control and monitoring capability of accelerator parameters to other locations, the operators will be able to control and observe the result of the control action at the same time. Since the new control console will be PC-based, the existing page format will be changed. The PC will be communicating with the Perkin-Elmer through RS-232 and a communication software package. Hardware configuration has been established, a communication software program that reads the pages from the shared memory has been developed. In this paper, we present the implementation strategy, works completed, existing and new page format, future action plans, explanation of pages and use of related global variables, a sample session, and flowcharts.« less

A remote control console for the HHIRF 25-MV Tandem Accelerator

DOE Office of Scientific and Technical Information (OSTI.GOV)

Hasanul Basher, A.M.

The CAMAC-based control system for the 25-MV Tandem Accelerator at HHIRF uses two Perkin-Elmer, 32-bit minicomputers: a message-switching computer and a supervisory computer. Two operator consoles are located on one of the six serial highways. Operator control is provided by means of a console CRT, trackball, assignable shaft encoders, and meters. The message-switching computer transmits and receives control information on the serial highways. At present, the CRT pages with updated parameters can be displayed and parameters can be controlled only from the two existing consoles, one in the Tandem control room and the other in the ORIC control room. Itmore » has become necessary to expand the control capability to several other locations in the building. With the expansion of control and monitoring capability of accelerator parameters to other locations, the operators will be able to control and observe the result of the control action at the same time. This capability will be useful in the new Radioactive Ion Beam project of the division. Since the new control console will be PC-based, the existing page format will be changed. The PC will be communicating with the Perkin-Elmer through RS-232 with the aid of a communication protocol. Hardware configuration has been established, a software program that reads the pages from the shared memory, and a communication protocol have been developed. The following sections present the implementation strategy, work completed, future action plans, and the functional details of the communication protocol.« less

Proceedings of the 10th international workshop on ECR ion sources

DOE Office of Scientific and Technical Information (OSTI.GOV)

Meyer, F W; Kirkpatrick, M I

This report contains papers on the following topics: Recent Developments and Future Projects on ECR Ion Sources; Operation of the New KVI ECR Ion Source at 10 GHz; Operational Experience and Status of the INS SF-ECR Ion Source; Results of the New ECR4'' 14.5 GHz ECRIS; Preliminary Performance of the AECR; Experimental Study of the Parallel and Perpendicular Particle Losses from an ECRIS Plasma; Plasma Instability in Electron Cyclotron Resonance Heated Ion Sources; The Hyperbolic Energy Analyzer; Status of ECR Source Development; The New 10 GHz CAPRICE Source; First Operation of the Texas A M ECR Ion Source; Recent Developmentsmore » of the RIKEN ECR Ion Sources; The 14 GHz CAPRICE Source; Characteristics and Potential Applications of an ORNL Microwave ECR Multicusp Plasma Ion Source; ECRIPAC: The Production and Acceleration of Multiply Charged Ions Using an ECR Plasma; ECR Source for the HHIRF Tandem Accelerator; Feasibility Studies for an ECR-Generated Plasma Stripper; Production of Ion Beams by using the ECR Plasmas Cathode; A Single Stage ECR Source for Efficient Production of Radioactive Ion Beams; The Single Staged ECR Source at the TRIUMF Isotope Separator TISOL; The Continuous Wave, Optically Pumped H{sup {minus}} Source; The H{sup +} ECR Source for the LAMPF Optically Pumped Polarized Ion Source; Present Status of the Warsaw CUSP ECR Ion Source; An ECR Source for Negative Ion Production; GYRAC-D: A Device for a 200 keV ECR Plasma Production and Accumulation; Status Report of the 14.4 GHZ ECR in Legnaro; Status of JYFL-ECRIS; Report on the Uppsala ECRIS Facility and Its Planned Use for Atomic Physics; A 10 GHz ECR Ion Source for Ion-Electron and Ion-Atom Collision Studies; and Status of the ORNL ECR Source Facility for Multicharged Ion Collision Research.« less

In-Beam Studies of High-Spin States in Mercury -184 and MERCURY-193 and Polarization Studies

NASA Astrophysics Data System (ADS)

Deng, Jingkang

The high-spin states in ^{184 }Hg and ^{193}Hg were studied by using the reactions ^{156 }Gd(^{32}S, 4n)^{184}Hg, in the spin spectrometer and ^{150}Nd( ^{48}Ca, 5n)^ {193}Hg, in the gamma -ray spectrometer, respectively, with the beams provided by the 25 MV tandem accelerator at the Holifield Heavy Ion Research Facility. Seven new rotational bands were observed for the first time in ^{184}Hg based on gamma-gamma coincidences with the use of a multiplicity filter. Spin assignments were based on the measured directional correlations for oriented nuclei (DCO ratios). The well-deformed prolate band was tentatively extended to 26^+ state. One new band in ^{184} Hg has a moment of inertia very similar to that of the s-band in ^{186}Hg which is assigned a (651, 1/2) otimes (770, 1/2) neutron configuration. However, it starts with a spin state of 5hbar, while the s-band in the ^{186}Hg starts with a I^pi = 11 ^- state. Some other bands were found in ^{184}Hg which are similar to ones in ^{186}Hg. However a pair of signature partner bands without signature splitting not seen in ^{186}Hg is observed. It shows the same alignment pattern below the band crossing with the bands in ^{182 }Pt and ^{180}Os lying in the N = 104 chain which consist of a nu(i_{13/2}h_{9/2} ) or nu(i_{13/2}f _{7/2}) configuration. A decay sequence above the 47/2, 5.4 MeV level in ^{193}Hg was established through discrete gamma-ray spectroscopy. This sequence was shown to feed several previously known levels in ^{193}Hg. The new energy levels exhibit non-collective single-particle character implying the dominant role of particle alignment mode at the moderate spin. This is in contrast to the collective bands observed in nearby lead isotope. The polarization detection efficiency of a symmetrical four Ge detector Compton polarimeter with the four detectors housed in one cryostat was measured by using the UNISOR low temperature nuclear orientation facility at HHIRF. It was shown that this Compton polarimeter has superior polarization detection efficiency compared to three detector and multisegment detector designs. It is suitable for polarization measurements in both low temperature and in-beam nuclear orientation studies. This detector was used during an in-beam spectroscopic study of ^{186}Hg and provided the crucial data which yielded a change in parity for the new band with deformation intermediate between normal and superdeformation in ^{186 }Hg.