The Polarized Electrons for Polarized Positrons experiment at the injector of the Continuous Electron Beam Accelerator Facility has demonstrated for the first time the efficient transfer of ...polarization from electrons to positrons produced by the polarized bremsstrahlung radiation induced by a polarized electron beam in a high-Z target. Positron polarization up to 82% have been measured for an initial electron beam momentum of 8.19 MeV/c, limited only by the electron beam polarization. This technique extends polarized positron capabilities from GeV to MeV electron beams, and opens access to polarized positron beam physics to a wide community.
A possible CDF data acquisition system upgrade using optical switching Chalfant, C.; Parker, J.; Goodman, J.W. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/1995, Letnik:
360, Številka:
1-2
Journal Article
Recenzirano
The CDF data acquisition (DAQ) system requires an upgrade to enable it to handle data rates of 1 kHz or more from the front-end to Level3. The current UltraNet network will have to be replaced, and ...one possibility is to do so with a scalable optical switching network. This paper discusses such a possibility.
FASTBUS readout system for the CDF DAQ upgrade Andresen, J.; Areti, H.; Black, D. ...
IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States),
08/1994, Letnik:
41, Številka:
4
Journal Article, Conference Proceeding
Recenzirano
Odprti dostop
The Data Acquisition System (DAQ) at the Collider Detector at Fermilab is currently being upgraded to handle a minimum of 100 events/sec for an aggregate bandwidth which is at least 25 Mbytes/sec. ...The DAQ System is based on a commercial switching network which has interfaces to VME bus. The modules that read out the front end crates (FASTBUS and RABBIT) have to deliver the data to the VME bus based host adapters of the switch. This paper describes a read out system that has the required bandwidth while keeping the experiment deadtime due to the read out to a minimum.< >
ACP/R3000 processors in data acquisition systems Deppe, J.; Areti, H.; Atac, R. ...
IEEE (Institute of Electrical and Electronics Engineers) Transactions on Nuclear Science; (USA),
10/1989, Letnik:
36, Številka:
5
Journal Article, Conference Proceeding
Recenzirano
ACP/R3000-processor-based data-acquisition systems for high-energy physics are described. This VMEbus-compatible processor board, with a computational power equivalent to 15 VAX 11/780s or better, ...contains 8 Mb of memory for event buffering and has a high-speed secondary bus that allow data gathering from front-end electronics. The ACPR3000 processor, the ACP/XBUS, the software support for the processor, and applications of the systems are discussed.< >
The ACP Branchbus, a high speed differential bus for data movement in multiprocessing and data acquisition environments, is described. This bus was designed as the central bus in the ACP ...multiprocessing system. In its full implementation with 16 branches and a bus switch, it will handle data rates of 160 MByte/sec and allow reliable data transmission over inter rack distances. We also summarize applications of the ACP system in experimental data acquisition, triggering and monitoring, with special attention paid to FASTBUS environments.
The Fermilab Advanced Computer Program is constructing a powerful multi-microprocessor system for data analysis in high-energy physics. The system will use commercial 32-bit microprocessors and be ...programmed in Fortran-77. A large array of support software allows easy migration of user applications from a uniprocessor environment to the multiprocessor, as well as providing sophisticated program development, debugging, and error handling and recavery tools. This system will provide computing power with a cost effectiveness of 3000-4000 per VAX 11/780 equivalent. We describe here the applications of this system as an on-line trigger processor. The low cost, commercial availability, compatibility with off-line analysis programs, and high data bandwidths (up to 160 MByte/sec) make this system an ideal choice for such real-time applications.
We report on the status of the Fermilab Advanced Computer Program's (ACP) project to provide more cost-effective computing engines for the high energy physics community. The project will exploit the ...cheap, but powerful, commercial microprocessors now available by constructing modular multi-microprocessor systems. A working test bed system as well as plans for the next stages of the project are described.
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