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2$sup 0$K vacuum pumping system for Baseball II

Description: A vacuum pumping system that provides a cryo surface for condensing and freezing of H/sub 2/ gas is described. A closed-loop vacuum system was designed and built at Lawrence Livermore Laboratory to pump down the neutralizer LH/sub e/ dewar with a volurae of 350 l and the lambda point dewar with a LH/sub e/ volume of 250 l. Both of these dewars can be pumped down simultaneously or one at a time. 100% of the H/sub e/ gas is recovered free of contaminations. The vacuum pump can handle 340 SCFM of … more
Date: August 20, 1973
Creator: Denhoy, B.S.
Partner: UNT Libraries Government Documents Department
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Cold vacuum drying facility design requirements

Description: This release of the Design Requirements Document is a complete restructuring and rewrite to the document previously prepared and released for project W-441 to record the design basis for the design of the Cold Vacuum Drying Facility.
Date: September 24, 1997
Creator: Irwin, J.J.
Partner: UNT Libraries Government Documents Department
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Impedances of Laminated Vacuum Chambers

Description: First publications on impedance of laminated vacuum chambers are related to early 70s: those are of S. C. Snowdon [1] and of A. G. Ruggiero [2]; fifteen years later, a revision paper of R. Gluckstern appeared [3]. All the publications were presented as Fermilab preprints, and there is no surprise in that: the Fermilab Booster has its laminated magnets open to the beam. Being in a reasonable mutual agreement, these publications were all devoted to the longitudinal impedance of round vacuum chamb… more
Date: June 22, 2011
Creator: Burov, A. & Lebedev, V.
Partner: UNT Libraries Government Documents Department
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APS storage ring vacuum system performance

Description: The Advanced Photon Source (APS) storage ring was designed to operated with 7-GeV, 100-mA positron beam with lifetimes > 20 hours. The lifetime is limited by residual gas scattering and Touschek scattering at this time. Photon-stimulated desorption and microwave power in the rf cavities are the main gas loads. Comparison of actual system gas loads and design calculations will be given. In addition, several special features of the storage ring vacuum system will be presented.
Date: June 1, 1997
Creator: Noonan, J. R.; Gagliano, J. & Goeppner, G. A.
Partner: UNT Libraries Government Documents Department
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The vacuum system for the PEP II high energy ring straight sections

Description: The six straight sections of the PEP II High Energy Ring (HER) serve various functions: lattice tuning, beam injection and abort, providing space for rf cavities, longitudinal and transverse feedback, beam diagnostics and the interaction point. A stainless steel vacuum system has been designed; prototypes are currently being built. Cooling is required due to radiation coming from the last arc dipole and resistive losses in the vacuum chamber. Although the nominal beam current of the HER is 1 A … more
Date: January 1, 1995
Creator: Wienands, U.; Daly, E.; Kulikov, A.; Kurita, N.; Nordby, M.; Perkins, C. et al.
Partner: UNT Libraries Government Documents Department
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2XIIB vacuum vessel: a unique design

Description: The 2XIIB mirror confinement experiment makes unique demands on its vacuum system. The confinement coil set encloses a cavity whose surface is comprised of both simple and compound curves. Within this cavity and at the core of the machine is the operating vacuum which is on the order of 10$sup -9$ Torr. The vacuum container fits inside the cavity, presenting an inside surface suitable for titanium getter pumping and a means of removing the heat load imposed by incandescent sublimator wires. In … more
Date: November 1, 1975
Creator: Hibbs, S. M. & Calderon, M. O.
Partner: UNT Libraries Government Documents Department
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Analysis of Beam Induced Pressure Increases in Rhic Warm Vacuum Sections.

Description: With increasing intensity of gold and proton beams during recent RHIC operations, pressure rises of several decades were observed at a few RHIC warm vacuum sections. The pressure increases were analyzed and compared with the beam parameters such as ion species, bunch intensity, total intensity, number ofbunches, bunch spacing and beam loss. Most of these pressure increases were found to be consistent with those induced by either beam loss and/or electron multipacting.
Date: June 2, 2002
Creator: Hseuh, H. C.; Smart, L. A. & Zhang, S. Y.
Partner: UNT Libraries Government Documents Department
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Betatron tune shifts and Laslett image coefficients

Description: The complicated expressions of betatron tune shifts in terms of Laslett image coefficients are explained. The expressions of image coefficients for a centered or off-centered beam inside an elliptical or rectangular vacuum chamber are gathered. Typos in earlier literature are corrected.
Date: July 20, 2001
Creator: Ng, K. Y.
Partner: UNT Libraries Government Documents Department
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Surface Impedance and Synchronous Modes

Description: The concept of the surface impedance is applicable to the case, when obstacles on the surface of a vacuum chamber are small compared to characteristic dimensions of the problem. We apply this concept to the calculation of a synchronous mode that can propagate in a tube with slightly corrugated walls. We also show that such a mode can propagate in a pipe with a rough surface, or a perforated pipe with a large number of holes.
Date: July 20, 1999
Creator: Stupakov, Gennady
Partner: UNT Libraries Government Documents Department
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An Analysis of Accumulator Ring Pressure Date

Description: This note summarizes and analyzes the Accumulator Ring's pressure data taken during the recent commissioning run (March-October, 1985) and during the three week interval immediately after the end of the commissioning run. Emphasis is placed upon the questions raised in reference [1], viz.: (1) What is the ultimate vacuum attainable? (2) How do we calculate the 'effective-pressure' for beam lifetime estimates from the ion gauge data? (3) What is the required sublimation schedule to maintain adeq… more
Date: January 9, 1986
Creator: Gormley, M.
Partner: UNT Libraries Government Documents Department
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Transverse resistive wall impedance for multi-layer round chambers

Description: The resistive wall impedance is usually calculated assuming the skin depth being much smaller than the chamber thickness. This approximation is not always correct. In particular, it is not valid when the revolution frequency is very low (as in VLHC [1]), or the surface is coated by a thin conductive layer (as for extraction kickers [2]), or for the coherent effects in the closed orbit motion [3]. A method of analytical calculation of the transverse impedance is developed here for multi-layer va… more
Date: June 11, 2002
Creator: Lebedev, Alexy Burov and Valeri
Partner: UNT Libraries Government Documents Department
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Superconducting drift-tube cavity development for the RIA driver.

Description: This paper reports the design and development of two intermediate-velocity superconducting cavities and design of an associated cryomodule for the RIA driver linac. The two cavity types are a 115 MHz, {beta}{sub GEOM} = 0.15 quarter-wave resonant (QWR) cavity, and a 173 MHz, {beta}{sub GEOM} = 0.26 half-wave loaded cavity. Both cavities are well-corrected for dipole and quadrupole asymmetries in the accelerating field. The cryomodule is being designed to incorporate a separate vacuum system for… more
Date: September 23, 2002
Creator: Shepard, K. W.; Kelly, M. P. & Fuerst, J. D.
Partner: UNT Libraries Government Documents Department
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Impedance analysis of the PEP-II vacuum chamber

Description: The PEP-II high energy ring (HER) vacuum chamber consists of a copper tube with periodically spaced pumping slots. The impedance of the vacuum chamber due to the slots is analyzed. Both narrow-band and broadband impedances are considered as well as longitudinal and transverse components thereof. It is found that although the broad-band impedance is tolerable, the narrow-band impedance may exceed the instability limit given by the natural damping with no feedback system on. Traveling wave modes … more
Date: May 1, 1995
Creator: Ng, C. K. & Weiland, T.
Partner: UNT Libraries Government Documents Department
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High-power vacuum window in WR10

Description: Results are presented for fabrication and test of a WR10 waveguide window, for use in ultra-high vacuum at 91.4 GHz. Low-power bench measurements are compared with analytic and simulation results. Operation at approximately equal to 4-kW peak power, duty factor 10{sup {minus}6} and 10{sup {minus}9}-scale vacuum is noted.
Date: June 28, 1999
Creator: Hill, Marc E
Partner: UNT Libraries Government Documents Department
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Beam coupling impedances of obstacles protruding into beam pipe

Description: The beam coupling impedances of small obstacles protruding inside the vacuum chamber of an accelerator are calculated analytically at frequencies for which the wavelength is large compared to a typical size of the obstacle. Simple formulas for a few important particular cases, including both essentially three-dimensional objects like a post or a mask and axisymmetric irises, are presented. The analytical results are compared and agree with three-dimensional computer simulations. These results a… more
Date: August 1, 1997
Creator: Kurennoy, S. S.
Partner: UNT Libraries Government Documents Department
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CSER 96-022: mass limit for 2-inch vacuum line in glovebox HC-18M

Description: This Criticality Safety Evaluation Report analyzes the criticality safety of transporting and sectioning a 2.5 meter (8 foot) section of 5.08 cm (2-inch) vacuum tubing with approximately 3.8 kg of PuO2 via the HC- 1 conveyor and HC- I 8M glovebox in the 234-5Z building.
Date: October 30, 1996
Creator: Erickson, D. G.
Partner: UNT Libraries Government Documents Department
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Characteristics of high gradient insulators for accelerator and high power flow applications

Description: The high gradient insulator has been demonstrated to operate at levels comparable or better than special geometry or coated insulators. Some patented insulator configurations allow for sophisticated accelerator structures, high power flow interfaces, and microwave applications not previously possible. Sophisticated manufacturing techniques available at AlliedSignal FM and T made this development possible. Bipolar and high power flow applications are specially suited for present insulator design… more
Date: July 1, 1997
Creator: Elizondo, J.M.; Krogh, M.L. & Smith, D.
Partner: UNT Libraries Government Documents Department
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CO[sub]2 huff-n-puff process in a light oil shallow shelf carbonate reservoir, quarterly technical progress report, January--March, 1997

Description: The principal objective of the Central Vacuum Unit (CVU) C0{sub 2} Huff-n-Puff (H-n-P) project is to determine the feasibility and practicality of the technology in a waterflooded shallow shelf carbonate environment. The results of parametric simulation of the C0{sub 2} H-n-P process, coupled with the CVU reservoir characterization components will be used to determine if this process is technically and economically feasible for field implementation. The technology transfer objective of the proj… more
Date: March 31, 1997
Creator: Wehner, S.C., Kovar, M., Casteel, J.
Partner: UNT Libraries Government Documents Department
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ITER vacuum vessel fabrication plan and cost study (D 68) for the international thermonuclear experimental reactor

Description: ITER Task No. 8, Vacuum Vessel Fabrication Plan and Cost Study (D68), was initiated to assess ITER vacuum vessel fabrication, assembly, and cost. The industrial team of Raytheon Engineers & Constructors and Chicago Bridge & Iron (Raytheon/CB&I) reviewed the current vessel basis and prepared a manufacturing plan, assembly plan, and cost estimate commensurate with the present design. The guidance for the Raytheon/CB&I assessment activities was prepared by the ITER Garching Work Site. This guidanc… more
Date: January 1, 1995
Partner: UNT Libraries Government Documents Department
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