Jefferson Lab’s outreach efforts towards the goals of Accelerator Stewardship Test Facility Pilot... more Jefferson Lab’s outreach efforts towards the goals of Accelerator Stewardship Test Facility Pilot Program consist of the lab’s efforts in three venues. The first venue, at the end of March is to meet with the members of Virginia Tech Corporate Research Center (VTCRC) (http://www.vtcrc.com/tenant-directory/) in Blacksburg, Virginia. Of the nearly 160 members, we expect that many engineering companies (including mechanical, electrical, bio, software) will be present. To this group, we will describe the capabilities of Jefferson Lab’s accelerator infrastructure. The description will include not only the facilities but also the intellectual expertise. No funding is requested for this effort. The second venue is to reach the industrial exhibitors at the 6th International Particle Accelerator Conference (IPAC’15). Jefferson Lab will host a booth at the conference to reach out to the >75 industrial exhibitors (https://www.jlab.org/conferences/ipac2015/SponsorsExhibitors.php) who represe...
Funding is being requested pursuant to the proposals entitled Elliptical Twin Cavity for Accelera... more Funding is being requested pursuant to the proposals entitled Elliptical Twin Cavity for Accelerator Applications that was submitted and reviewed through the Portfolio Analysis and Management System (PAMS). The PAMS proposal identifier number is 0000219731. The proposed new type of superconducting cavity, the Elliptical Twin Cavity, is capable of accelerating or decelerating beams in two separate beam pipes. This configuration is particularly effective for high-current, low energy electron beams that will be used for bunched beam cooling of high-energy protons or ions. Having the accelerated beam physically separated from the decelerated beam, but interacting with the same RF mode, means that the low energy beam from the gun can be injected into to the superconducting cavity without bends enabling a small beam emittance to be maintained. A staff engineer who has been working with non-standard complicated cavity structures replaces the senior engineer (in the original budget) who is ...
Angular and multiplicity correlations in proton–nucleus interactions in emulsion are interpreted ... more Angular and multiplicity correlations in proton–nucleus interactions in emulsion are interpreted within the framework of the Energy Flux Cascade model. The average mass of the 'slow bodies' or novae emitted in the backward hemisphere is ~3.5 GeV/c2 at both energies. This result is in reasonable agreement with previous work on two-particle correlations.
This report was prepared as an account of work sponsored by an agency of the United States Govern... more This report was prepared as an account of work sponsored by an agency of the United States Government, Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express OF implied, OF assumes any legal liability or responsibility for the accuracy, completeness, OF usefulness of any information, apparatus, product, OF process disclosed, or represents that its use would not infringe privately owned Fights. Reference herein to any specifi! commercial product, process, or service by trade name, trademark, manufacturer, OF otherwise, does not necessarily constitute or imply its endorsement, recommendation, OF favoring by the United States Government or any agency thereof The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
The yields and the transverse-momentum distributions of pions, kaons, and antiprotons produced in... more The yields and the transverse-momentum distributions of pions, kaons, and antiprotons produced in the central region of Pp collisions at Js 1.8 TeU at the Fermilab Tevatron collider have been measured up to a charged-particle pseudorapidity density of approximately 20. The average transverse momentum (p,) as a function of (dN, /drt) for all three types of particles is presented.
E-735 is searching for signs of the quark-gluon-plasma phase transition in minimum bias proton-an... more E-735 is searching for signs of the quark-gluon-plasma phase transition in minimum bias proton-antiproton events. Results from the 1987 run at the Tevatron Collider at &surd;s = 1.8TeV are presented. Included are distributions of the average Pt versus multiplicity dependence for charged particles, and preliminary particle identification analysis using time of flight.
We present a survey of the recent results of E-735 in its search for QGP signals at the Fermilab ... more We present a survey of the recent results of E-735 in its search for QGP signals at the Fermilab Collider. The basic data are the inclusive Pt distributions of centrally produced pi, K, p¯ and Lambda0 as a function of total charged multiplicity in the collision; the variation of <Pt> and particle ratios are derived. Preliminary results on pi-pi correlations and inclusive photon production are also presented.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1994
ABSTRACT A fast trigger processor was developed for the study of high multiplicity charged partic... more ABSTRACT A fast trigger processor was developed for the study of high multiplicity charged particle events in collisions at the Tevatron Collider accelerator. The processor allowed the scaling of triggers for specified multiplicity ranges and was incorporated in the fast trigger logic. Work supported by the US Department of Energy under contract No. DE-AC02-76CH03000.
We describe ACl'/R3000 processor based data acquisition svstems for hieh enerev ohvsics. This VME... more We describe ACl'/R3000 processor based data acquisition svstems for hieh enerev ohvsics. This VME bus-, a , cbmpatible processor board, with a computational power equivalent to 15 VAX 11/78Os or better, contains 8 Mb of memory for event buffering and has a high speed secondary bus that allows data gathering from front end electronics.
Tbe ACT Branchbus, a high speed differential bus for dam movemem in multiprocessing and data acqu... more Tbe ACT Branchbus, a high speed differential bus for dam movemem in multiprocessing and data acquisition environments, is described. This bus was designed as the central bus in the ACP multiprocessing system. In iu full implementation with 16 branches and a bus switch, it will handle data rates of 160 MByWsec and allow reliable data Inmmission over inter rack distances. We also summarize applications of the ACP system in experimental data acquisition. niggedng and monitoring, with special aifemion paid to FASXWS envimnments. Jn-The Advanced Computer Program (AC,') a, Fermilab has designed a multiprocessor system for off line reconstruction of data from high energy physics enperimenll and high level on line triggers., This system makes FORTRAN passing power available a, a presem cos, of roughly $ZooO per VAX L l/l80 equ+alenL lXe system is based on single board computers incorporating popular 32 bit micmprcawn (currendy the Motorola 68020 ind tk AT&T 32lCO). on board floating point coprccessors. and 2 MBytes Of memory. These CPUs are standard VME modules with full masfer and slave capabdides. Cenval to the mukipmceswr system is the ACP Branchbus, which is rhe means for connec,ing the fntentiauy large mlmhn of crates ,ha, contain the individual processing elemenu;. Tlw farm of processor "nodes" is managed by a single has, computer. The nodes run identical FORTRAN pmgmms. They process and analyze separa,e dam samples cnrurrrndy. Tbe data is delivered and retrieved by the hoa and its tape drives sld d&x 'Ithe design goals of the project emphasized an open and ccmptitive environment for the pmcewrs. In this way the system is receptive to dx mosi cost effective processing elanems available from indusvy a, any time. The goal was to allow individual processor nodes 10 funaion. as appmpriare. in any of a number of 32 bit multi maxer bus systems such as VME. Multi-bus II. NuBus. FASTBUS and VAXBl Bus. With dx exception of FASTBUS. none of the buses had a means for wrmecring several clilfes rogether a, high dafa rates. The ACP Branchbus addresses dds pmblem of Linking several high performance local buses m a hoa. FASTBUS was felt to bz mom cornplex (and expensive) than rqdmd for the immedka and fu,um needs of this application involving single board computers. In addition, the larger VME ~stomer base was more conducive to ultimate commercializadon of ACF' designs. The ACP Branchbus was therefore designed to allow bigb spzed block uansfem to or from a has, to any one of a number of slaves residing in any of a number of crams lids bus now forms the backbone of both off line and on Iii A8 systems.
Software has been developed for use with the Fermilab ACP multiprocessor system (described in an ... more Software has been developed for use with the Fermilab ACP multiprocessor system (described in an accompanying paper). The software was designed to make a system of a hundred independent node processors aa easy to use M a single, powerful CPU. Subroutines have been developed by which a user's host program can send data to and get results from the program running in each of hi ACP node processors. Utility programs m&e it easy to compile and link host and node programs, to debug a node program on au ACP development system, and to submit a debugged program to au ACP production system.
Jefferson Lab’s outreach efforts towards the goals of Accelerator Stewardship Test Facility Pilot... more Jefferson Lab’s outreach efforts towards the goals of Accelerator Stewardship Test Facility Pilot Program consist of the lab’s efforts in three venues. The first venue, at the end of March is to meet with the members of Virginia Tech Corporate Research Center (VTCRC) (http://www.vtcrc.com/tenant-directory/) in Blacksburg, Virginia. Of the nearly 160 members, we expect that many engineering companies (including mechanical, electrical, bio, software) will be present. To this group, we will describe the capabilities of Jefferson Lab’s accelerator infrastructure. The description will include not only the facilities but also the intellectual expertise. No funding is requested for this effort. The second venue is to reach the industrial exhibitors at the 6th International Particle Accelerator Conference (IPAC’15). Jefferson Lab will host a booth at the conference to reach out to the >75 industrial exhibitors (https://www.jlab.org/conferences/ipac2015/SponsorsExhibitors.php) who represe...
Funding is being requested pursuant to the proposals entitled Elliptical Twin Cavity for Accelera... more Funding is being requested pursuant to the proposals entitled Elliptical Twin Cavity for Accelerator Applications that was submitted and reviewed through the Portfolio Analysis and Management System (PAMS). The PAMS proposal identifier number is 0000219731. The proposed new type of superconducting cavity, the Elliptical Twin Cavity, is capable of accelerating or decelerating beams in two separate beam pipes. This configuration is particularly effective for high-current, low energy electron beams that will be used for bunched beam cooling of high-energy protons or ions. Having the accelerated beam physically separated from the decelerated beam, but interacting with the same RF mode, means that the low energy beam from the gun can be injected into to the superconducting cavity without bends enabling a small beam emittance to be maintained. A staff engineer who has been working with non-standard complicated cavity structures replaces the senior engineer (in the original budget) who is ...
Angular and multiplicity correlations in proton–nucleus interactions in emulsion are interpreted ... more Angular and multiplicity correlations in proton–nucleus interactions in emulsion are interpreted within the framework of the Energy Flux Cascade model. The average mass of the 'slow bodies' or novae emitted in the backward hemisphere is ~3.5 GeV/c2 at both energies. This result is in reasonable agreement with previous work on two-particle correlations.
This report was prepared as an account of work sponsored by an agency of the United States Govern... more This report was prepared as an account of work sponsored by an agency of the United States Government, Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express OF implied, OF assumes any legal liability or responsibility for the accuracy, completeness, OF usefulness of any information, apparatus, product, OF process disclosed, or represents that its use would not infringe privately owned Fights. Reference herein to any specifi! commercial product, process, or service by trade name, trademark, manufacturer, OF otherwise, does not necessarily constitute or imply its endorsement, recommendation, OF favoring by the United States Government or any agency thereof The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
The yields and the transverse-momentum distributions of pions, kaons, and antiprotons produced in... more The yields and the transverse-momentum distributions of pions, kaons, and antiprotons produced in the central region of Pp collisions at Js 1.8 TeU at the Fermilab Tevatron collider have been measured up to a charged-particle pseudorapidity density of approximately 20. The average transverse momentum (p,) as a function of (dN, /drt) for all three types of particles is presented.
E-735 is searching for signs of the quark-gluon-plasma phase transition in minimum bias proton-an... more E-735 is searching for signs of the quark-gluon-plasma phase transition in minimum bias proton-antiproton events. Results from the 1987 run at the Tevatron Collider at &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;surd;s = 1.8TeV are presented. Included are distributions of the average Pt versus multiplicity dependence for charged particles, and preliminary particle identification analysis using time of flight.
We present a survey of the recent results of E-735 in its search for QGP signals at the Fermilab ... more We present a survey of the recent results of E-735 in its search for QGP signals at the Fermilab Collider. The basic data are the inclusive Pt distributions of centrally produced pi, K, p¯ and Lambda0 as a function of total charged multiplicity in the collision; the variation of <Pt> and particle ratios are derived. Preliminary results on pi-pi correlations and inclusive photon production are also presented.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1994
ABSTRACT A fast trigger processor was developed for the study of high multiplicity charged partic... more ABSTRACT A fast trigger processor was developed for the study of high multiplicity charged particle events in collisions at the Tevatron Collider accelerator. The processor allowed the scaling of triggers for specified multiplicity ranges and was incorporated in the fast trigger logic. Work supported by the US Department of Energy under contract No. DE-AC02-76CH03000.
We describe ACl'/R3000 processor based data acquisition svstems for hieh enerev ohvsics. This VME... more We describe ACl'/R3000 processor based data acquisition svstems for hieh enerev ohvsics. This VME bus-, a , cbmpatible processor board, with a computational power equivalent to 15 VAX 11/78Os or better, contains 8 Mb of memory for event buffering and has a high speed secondary bus that allows data gathering from front end electronics.
Tbe ACT Branchbus, a high speed differential bus for dam movemem in multiprocessing and data acqu... more Tbe ACT Branchbus, a high speed differential bus for dam movemem in multiprocessing and data acquisition environments, is described. This bus was designed as the central bus in the ACP multiprocessing system. In iu full implementation with 16 branches and a bus switch, it will handle data rates of 160 MByWsec and allow reliable data Inmmission over inter rack distances. We also summarize applications of the ACP system in experimental data acquisition. niggedng and monitoring, with special aifemion paid to FASXWS envimnments. Jn-The Advanced Computer Program (AC,') a, Fermilab has designed a multiprocessor system for off line reconstruction of data from high energy physics enperimenll and high level on line triggers., This system makes FORTRAN passing power available a, a presem cos, of roughly $ZooO per VAX L l/l80 equ+alenL lXe system is based on single board computers incorporating popular 32 bit micmprcawn (currendy the Motorola 68020 ind tk AT&T 32lCO). on board floating point coprccessors. and 2 MBytes Of memory. These CPUs are standard VME modules with full masfer and slave capabdides. Cenval to the mukipmceswr system is the ACP Branchbus, which is rhe means for connec,ing the fntentiauy large mlmhn of crates ,ha, contain the individual processing elemenu;. Tlw farm of processor "nodes" is managed by a single has, computer. The nodes run identical FORTRAN pmgmms. They process and analyze separa,e dam samples cnrurrrndy. Tbe data is delivered and retrieved by the hoa and its tape drives sld d&x 'Ithe design goals of the project emphasized an open and ccmptitive environment for the pmcewrs. In this way the system is receptive to dx mosi cost effective processing elanems available from indusvy a, any time. The goal was to allow individual processor nodes 10 funaion. as appmpriare. in any of a number of 32 bit multi maxer bus systems such as VME. Multi-bus II. NuBus. FASTBUS and VAXBl Bus. With dx exception of FASTBUS. none of the buses had a means for wrmecring several clilfes rogether a, high dafa rates. The ACP Branchbus addresses dds pmblem of Linking several high performance local buses m a hoa. FASTBUS was felt to bz mom cornplex (and expensive) than rqdmd for the immedka and fu,um needs of this application involving single board computers. In addition, the larger VME ~stomer base was more conducive to ultimate commercializadon of ACF' designs. The ACP Branchbus was therefore designed to allow bigb spzed block uansfem to or from a has, to any one of a number of slaves residing in any of a number of crams lids bus now forms the backbone of both off line and on Iii A8 systems.
Software has been developed for use with the Fermilab ACP multiprocessor system (described in an ... more Software has been developed for use with the Fermilab ACP multiprocessor system (described in an accompanying paper). The software was designed to make a system of a hundred independent node processors aa easy to use M a single, powerful CPU. Subroutines have been developed by which a user's host program can send data to and get results from the program running in each of hi ACP node processors. Utility programs m&e it easy to compile and link host and node programs, to debug a node program on au ACP development system, and to submit a debugged program to au ACP production system.
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