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Experimental test accelerator: description and results of initial experiments

Description: The ETA is a high current (10,000 Amp) linear induction accelerator that produces short (30 ns) pulses of electrons at 5 MeV twice per second or in bursts of 5 pulses separated by as little as one millisecond. At this time the machine has operated at 65% of its design current and 90% of the design voltage. This report contains a description of the accelerator and its diagnostics; the results of the initial year of operation; a comparison of design codes with experiments on beam transport; and a… more
Date: June 2, 1980
Creator: Fessenden, T.; Birx, D. & Briggs, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fast pressure measurements for the TMX-U fusion experiment

Description: The pressure on the boundary of the Lawrence Livermore National Laboratory's (LLNL) tandem mirror (TMX-U) plasma experiment is difficult to trace for several reasons: (1) the TMX-U boundary is in the high vacuum range (10/sup -5/ to 10/sup -6/ Pa) and requires an ionization gauge; (2) the boundary includes high-energy neutral particles and radiation, so the gauge must be optically baffled from the plasma; (3) the gauge must be shielded from the magnetic flux density of 0.03 T; (4) maximum condu… more
Date: November 2, 1982
Creator: Hunt, A.L.; Coffield, F.E. & Pickles, W.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Last Year of PEP-II B-Factory Operation

Description: The PEP-II B-Factory at SLAC (3.1 GeV e{sup +} x 9.0 GeV e{sup -}) operated from 1999 to 2008, delivering luminosity to the BaBar experiment. The design luminosity was reached after one and a half years of operation. In the end PEP-II surpassed by four times its design luminosity reaching 1.21 x 10{sup 34} cm{sup -2} s{sup -1}. It also set stored beam current records of 2.1 A e{sup -} and 3.2 A e{sup +}. Continuous injection was implemented with BaBar taking data. The total delivered luminosity… more
Date: November 2, 2011
Creator: Seeman, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Gridded Electron Guns and Modulation of Intense Beams

Description: Gridded guns are useful for producing modulated electron beams. This modulation is generally limited to simple gating of the beam, but may be used to apply structure to the beam pulse shape. In intense beams, this structure spawns space charge waves whose dynamics depend in part on the relative strengths of the velocity and density variations which comprise the initial current modulation. In this paper, we calculate the strengths of beam current and velocity modulation produced in a gridded ele… more
Date: May 2, 2006
Creator: Harris, J R & O'Shea, P G
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New aspects of beam-beam interactions in hadron colliders

Description: Beam-beam phenomena have until now limited the beam currents and luminosity achievable in the Tevatron. injected proton currents are about ten times larger than the anti-proton currents so beam-beam effects have largely acted on the anti-protons and at all stages of the operational cycle. The effects of the anti-protons on the protons have until now been relatively benign but that may change at higher anti-proton currents. After 36 bunches of protons are injected and placed on the proton helix,… more
Date: June 2, 2003
Creator: Sen, Tanaji
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Application of magnetic pulse compression to the grid system of the ETA/ATA accelerator

Description: During the past year, several magnetic pulse compression systems have been built and applied to the ETA accelerator. In view of their excellent performance, a non-linear magnetic system has been adopted for the ATA grid drive in place of the spark gap driven Blumlein. The magnetic system will give us a much higher reliability and greater flexibility by being independent of the high pressure gas blown system. A further advantage of this system will be the capability of achieving higher rep-rates… more
Date: November 2, 1982
Creator: Birx, D. L.; Cook, E. G.; Reginato, L. L.; Schmidt, J. A. & Smith, M. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Commissioning the 90 Degree Lattice for the PEP II High Energy Ring

Description: In order to benefit from further reduction of the vertical IP beta function of the PEP-II high energy ring (HER) the bunch length should be reduced. This will be achieved by changing the phase advance from 60 degree to 90 degree in the four arcs not adjacent to the IR region, thus reducing momentum compaction by about 30% and reducing bunch length from a present 12 mm down to 8.5 mm at low beam current. In preparation to implement the 90 degree lattice the main HER quadrupole and sextupole stri… more
Date: November 2, 2011
Creator: Wittmer, W.; Cai, Y.; Cheng, W. X.; Colocho, W. S.; Decker, F. J.; Ecklund, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of a Compact Radiography Accelerator Using Dielectric Wall Accelerator Technology

Description: We are developing an inexpensive compact accelerator system primarily intended for pulsed radiography. Design characteristics are an 8 MeV endpoint energy, 2 kA beam current, a cell gradient of approximately 3 MV/m (for an overall accelerator length is 2-3 m), and <$1/Volt capital costs. Such designs have been made possible with the development of high specific energy dielectrics (>10J/cm{sup 3}), specialized transmission line designs and multi-gap laser triggered low jitter (<1 ns) ga… more
Date: June 2, 2005
Creator: Sampayan, S.; Caporaso, G.; Chen, Y.; Hawkins, S.; Holmes, C.; Krogh, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SHIELDING REQUIREMENTS FOR NSLS-II.

Description: Brookhaven National Laboratory is in the process of designing a new Electron Synchrotron for scientific research using synchrotron radiation. This facility, called the 'National Synchrotron Light Source II' (NSLS-II), will provide x-ray radiation of ultra-high brightness and exceptional spatial and energy resolution. It will also provide advanced insertion devices, optics, detectors, and robotics, and a suite of scientific instruments designed to maximize the scientific output of the facility. … more
Date: January 2, 2008
Creator: Job, P. K. & Casey, W. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Improvements on the accuracy of beam bugs

Description: At LLNL resistive wall monitors are used to measure the current and position used on ETA-II show a droop in signal due to a fast redistribution time constant of the signals. This paper presents the analysis and experimental test of the beam bugs used for beam current and position measurements in and after the fast kicker. It concludes with an outline of present and future changes that can be made to improve the accuracy of these beam bugs. of intense electron beams in electron induction linacs … more
Date: September 2, 1998
Creator: Chen, Y. J. & Fessenden, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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