I. D. Ojha
Vanderbilt University
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Featured researches published by I. D. Ojha.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2003
S. H. Aronson; J. Bowers; J. Chiba; G. T. Danby; A. Drees; O. Fackler; A. Franz; J.P. Freidberg; W. Guryn; A. Harvey; T. Ichihara; J. W. Jackson; R. Jayakumar; S. Kahn; V. Kashikhin; P. J. Kroon; M. Libkind; M. Marx; W. Meng; F. Messer; S. Migluolio; I. D. Ojha; R. Prigl; G. Riabov; R. Ruggiero; N. Saito; R. Schleuter; Y. Severgin; A. Shajii; V. Shangin
Abstract The PHENIX magnet system is composed of three spectrometer magnets with warm iron yokes and water-cooled copper coils. The Central Magnet (CM) is energized by two pairs of concentric coils and provides a field around the interaction vertex that is parallel to the beam. This allows momentum analysis of charged particles in the polar angle range from 70° to 110°. The north and south Muon Magnets (MMN and MMS) use solenoid coils to produce a radial magnetic field for muon analysis. They each cover a pseudorapidity interval of 1.1–2.3 and full azimuth. The coils are wound on cylindrical surfaces at the end of large tapered pistons. Each of the three magnets provides a field integral of about 0.8 T -m. The physical and operating parameters of the magnets and their coils are given along with a description of the magnetic fields generated. The geometric, thermal and magnetic analysis leading to the coil design is discussed. The magnetic volumes of the PHENIX magnets are very large and complex, so a new technique was developed to map the fields based on surface measurements of a single field component using single axis Hall probes mounted on a rotating frame. A discussion of the performance of the CM during the first year of PHENIX running is given.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2003
S. S. Adler; T. Chujo; E. J. Desmond; L. Ewell; T. K. Ghosh; J. S. Haggerty; T. Ichihara; B. V. Jacak; S. C. Johnson; H-J. Kehayias; J. Lauret; Charles Maguire; M. Messer; S. Mioduszewski; J. T. Mitchell; D. P. Morrison; I. D. Ojha; C.H. Pinkenburg; M. Pollack; K. Pope; M. L. Purschke; S. Sorensen; I. Sourikova; T. L. Thomas; M. Velkovsky; Y. Watanabe; C. Witzig; S. Yokkaichi; W. A. Zajc
Data handling in PHENIX is carried out by the On-Line Computing System (ONCS) and Off-Line Computing System (Off-Line). ONCS provides the overall control and monitoring of the front-end electronics, trigger and data acquisition system and detector ancillary systems. It configures and initializes the on-line system, monitors and controls the data flow, coordinates calibration processes, interlocks the data acquisition process with the slow control subsystems and performs a number of other functions. ONCS uses CORBA software to monitor and control the hardware. Off-Line provides all aspects of data handling not directly connected to the collection of data and monitoring, such as event simulation and reconstruction, data analysis and information management. The impact of the unprecedented data volumes on the design is presented, along with a detailed discussion of the tasks and methods of simulating, obtaining and monitoring the data.
