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Measurement of Escaping Ions in the Fermilab Antiproton Accumulator

Description: Positively charged ions trapped in the negatively charged beam of the Fermilab antiproton accumulator pose a limit to beam stability and density. To better understand the dynamics and the consequences of the beam-ion interaction, they have built and installed a low energy ion detector and energy analyzer in the Fermilab accumulator. This analyzer is capable of energy analysis of the escaping ions using a probe with energy retarding grids and may also be scanned in the pitch angle of the escaping ions. Measurements have been made in both longitudinal and transverse planes under a variety of machine operating conditions. The experimental measurement results are presented together with attempts to model the ion dynamics and explain observations.
Date: January 1, 1992
Creator: Zhou, P.; Colestock, P.L.; Junck, K.; Crawford, C.A. & /Fermilab
Partner: UNT Libraries Government Documents Department

Trapped Ions and Beam Coherent Instability

Description: In accelerators with negatively charged beams, ions generated from the residual gas molecules may be trapped by the beam. Trapped ions may interact resonantly with the beam and cause a beam-ion coherent instability. This coherent instability bears many similarities to the resistive wall instability and can present important limitations to those machines operation. A description of this effect requires a treatment of the beam coherent instability including both the normal machine wake field and the interaction with ions. They present a linear approach incorporating contributions from the machine impedance as well as ion forces. it also includes spreads in beam and ion frequencies and thus Landau damping. The analysis results in a modified stability diagram which will be used together with physical arguments to explain experimental observations in the Fermilab antiproton accumulator.
Date: January 1, 1992
Creator: Zhou, P.; Colestock, P.L.; Werkema, S.J. & /Fermilab
Partner: UNT Libraries Government Documents Department

Direct liquefaction proof-of-concept program

Description: The POC Bench Option Project (PB-Series) is geared to evaluate different novel processing concepts in catalytic direct coal liquefaction and coprocessing of organic wastes such as plastics, heavy resids, waste oils, and ligno-cellulose wastes with coal. The new ideas being explored in this program include using novel dispersed slurry catalysts and combinations of dispersed and supported catalysts (hybrid mode), and coprocessing of coal with waste plastics, low quality resids, waste oils, and ligno-cellulosic wastes, etc. The primary objective of bench run PB-07 was to study the impact of dispersed catalyst composition and loading upon the direct liquefaction performance of a high volatile bituminous Illinois No. 6 coal. The run was carried out for 20 operating days (including the four days used for the production of O-6 bottoms material for West Virginia University), spanning over five process conditions. Results are reported.
Date: December 1, 1997
Creator: Comolli, A.G.; Zhou, P.Z.; Lee, T.L.K.; Hu, J.; Karolkiewicz, W.F. & Popper, G.
Partner: UNT Libraries Government Documents Department


Description: This report presents the results of the bench-scale work, Bench Run PB-09, HTI Run Number 227-106, conducted under the DOE Proof-of-Concept Option Program indirect coal liquefaction at Hydrocarbon Technologies Inc. in Lawrenceville, New Jersey. Bench Run PB-09 was conducted using two types of Chinese coal, Shenhua No.2 and Shenhua No.3, and had several goals. One goal was to study the liquefaction performance of Shenhua No.2 and Shenhua No.3 with respect to coal conversion and distillate production. Another goal of Bench Run PB-09 was to study the effect of different GelCatw formulations and loadings. At the same time, the space velocity and the temperature of the fmt reactor, K-1, were varied to optimize the liquefaction of the two Chinese coals. The promoter-modified HTI GelCat{trademark} catalyst was very effective in the direct liquefaction of coal with nearly 92% maf coal conversion with Shenhua No.3 and 93% maf coal conversion with 9 Shenhua No.2. Distillate yields (CQ-524 C)varied from 52-68% maf for Shenhua No.3 coal to 54-63% maf for Shenhua No.2 coal. The primary conclusion from Bench Run PB-09 is that Shenhua No.3 coal is superior to Shenhua No.2 coal in direct liquefaction due to its greater distillate production, although coal conversion is slightly lower and C{sub 1}-C{sub 3} light gas production is higher for Shenhua No.3. The new promoter modified GelCat{trademark} proved successful in converting the two 9 Chinese coals and, under some conditions, producing good distillate yields for a coal-only bench run. Run PB-09 demonstrated significantly better performance of China Shenhua coal using HTI's coal direct liquefaction technology and GelCat{trademark} catalyst than that obtained at China Coal Research Institute (CCRI, coal conversion 88% and distillate yield 61%).
Date: December 30, 1999
Creator: Comolli, A.G.; Lee, T.L.K.; Hu, J.; Popper, G.; Elwell, M.D.; Miller, J. et al.
Partner: UNT Libraries Government Documents Department

An 805 MHz disk and washer accelerating structure with coaxial coupler for the Fermilab upgrade

Description: The Disk and Washer (DAW) structure with four bi-periodic tees to support the washers has been studied at Fermilab for the Linac Upgrade by constructing two, 805 MHz, one-meter sections joined by a coaxial coupler. The coupler provides an rf drive port, an adjustable tuner, a vacuum port, and an enclosure for the installation of beam focussing and monitoring devices. This configuration is suitable for a high beta proton linear accelerator. The bi-periodic tee supports in the DAW structure suppress the TM{sub 11} mode at the operating frequency which has been a problem with previous designs. Frequency-mode spectra have been calculated and measured as well as the quantities Q, R/Q, and ZT{sup 2}. The structure has been evacuated and operated at high power levels and high accelerating fields. 5 refs., 4 figs., 2 tabs.
Date: September 1, 1989
Creator: Young, D.E.; Moretti, A.; Lee, G.; Mills, F.E.; Zhou, P. (Fermi National Accelerator Lab., Batavia, IL (USA)); Swenson, D.A. et al.
Partner: UNT Libraries Government Documents Department

Factors Controlling In Situ Uranium and Technetium Bioreductionat the NABIR Field Research Center

Description: This research hypotheses is: (1) Indigenous microorganisms in the shallow aquifer at the FRC have the capability to reduce U(VI) and Tc(VII) but rates are limited by--Scarce electron donor, Low pH and potentially toxic metals, and High nitrate. (2) U(VI) and Tc(VII) reduction rates can be increased by--Successive donor additions, Raising pH to precipitate toxic metals, and Adding humics to complex toxic metals and serve as electron shuttles.
Date: March 17, 2004
Creator: Istok, J.; Jones, J.; Park, M.; Sapp, M.; Selko, E.; Laughman, R. et al.
Partner: UNT Libraries Government Documents Department

Physics of the AGS-to-RHIC transfer line commissioning

Description: This paper presents beam physics results from the fall 1995 AGS-to- RHIC (ATR) transfer line commissioning run with fully ionized gold nuclei. We first describe beam position monitors and transverse video profile monitors, instrumentation relevant to measurements performed during this commissioning. Measured and corrected beam trajectories demonstrate agreement with design optics to a few percent, including optical transfer functions and beamline dispersion. Digitized 2- dimensional video profile monitors were used to measure beam emittance, and beamline optics and AGS gold ion beam parameters are shown to be comparable to RHIC design requirements.
Date: July 1, 1996
Creator: Satogata, T.; Ahrens, L.; Brennan, M.; Brown, K.; Clifford, T.; Connolly, R. et al.
Partner: UNT Libraries Government Documents Department