DETERMINING PHASE-SPACE PROPERTIES OF THE LEDA RFQ OUTPUT BEAM
Quadruple scans were used to characterize the LEDA RFQ beam. Experimental data were fit to computer simulation models for the rms beam size. The codes were found to be inadequate in accurately reproducing details of the wire scanner data. When this discrepancy is resolved, we plan to fit using all the data in wire scanner profiles, not just the rms value.
STATUS UPDATE ON THE LOW-ENERGY DEMONSTRATION ACCELERATOR (LEDA)*
As part of the linac design for the accelerator production of tritium (APT) project, we are assembling the first approximately 10-MeV portion of this cw, 100-mA proton accelerator. The primary objective of this low-energy demonstration accelerator (LEDA) is to verify the design codes, gain fabrication knowledge, understand beam operation, and improve prediction of costs and operational availability for the full 1000- to 1700-MeV APT accelerator. This paper provides an updated report on this past year’s progress that includes extensive beam tests of the LEDA injector using the Chalk River Injector Test Stand (CRITS) radio-frequency quadrupole (RFQ) accelerator. The CRITS RFQ produces a cw, 100-mA, 1.25-MeV RFQ output beam. We also report on fabrication, assembly, tuning, and installation of the 6.7MeV LEDA RFQ; installation and testing of the 350-MHz RF system; fabrication of the high-energy beam transport (HEBT); installation (as well as prototype testing) of the LEDA ogive beam stop; and upgrades to the facility. First tests with the 6.7-MeV, 100-mA, cw beam from the RFQ are scheduled for late fall, 1998. References are given to many detailed papers on LEDA at this conference.
Quantitative and qualitative relationship between swirl burner operatingconditions and pulverized coal flame length
Abstract Currently, there are used in power plants two types of burners to combustion the pulverized coal: jet burners and swirl burners. Most of the published works in the field of analysis of burners operating conditions are related to jet burners and are limited to initial region of the flame at the outlet of the burner. For jet burners an offset between the burner outlet and the flame beginning point could be analyzed. In the case of swirl burners with the pre-mixing diffuser chamber an offset between flame ignition point and burner outlet is usually not visible. Because already in the pre-mixing diffuser chamber of swirl burner occurs the ignition of coal-dust together with oxidant-gas cloud and thereby the formation of the flame. Therefore, the analysis of operating conditions for this types of burners requires a different approach. There is a lack of researches, in which will be analyzed changes of the flame length, that are caused by changes of design and operating parameters of swirl burner with the pre-mixing diffuser chamber. Therefore the aim of this study was to implement and verify the methodology for estimating the flame length, which will allow monitoring changes of operating conditions, that are caused by changes of design and operating parameters of swirl burner with the pre-mixing diffuser chamber. To carry out the analysis of the image of the coal flame, the two algorithms have been presented. This two algorithms, being based on the video images of the coal flame allows to specify and detect the end point of the flame and on that basis the length of the flame, as well as the fluctuation changes of flame length can be later determined. Both, the change thermal loads of coal burner, streams of secondary air, as well as the constructional change of the angle of swirler assemblies, resulted in distinct changes in the length of the pulverized coal flame.