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Inline Monitors for the SRS Small Column Ion Exchange Process

Description: A Small Column Ion Exchange (SCIX) system, designed by the Oak Ridge and Savannah River National Laboratories (ORNL and SRNL), is a potential way to reduce Cs-137 concentrations in high-level radioactive waste at the Savannah River Site (SRS). SRNL has developed gamma-ray monitors for six locations within the SCIX system to verify the proper operation of the ion exchange system, detect cesium breakthrough, and confirm the presence of cesium before and after used resin is transferred to a grinder module. Two sodium iodide breakthrough monitors, one Geiger-Mueller breakthrough monitor, and three Geiger-Mueller transfer monitors were used. The present work provides a means of measuring the Cs-137 and Ba-137m breakthrough by taking multiple measurements in a process flow diversion and isolation loop. A lead shield was used for the NaI detectors, and the aperture of the collimator tube in this shield was designed using Monte Carlo analyses to provide the desired count rate for the gamma rays of interest. A computer program was written to collect data from the process monitors, provide alarm notification, and plot the data for ease of operation.
Date: May 16, 2005
Creator: VITO, CASELLA
Partner: UNT Libraries Government Documents Department

Dynamical Effects Due to Fringe Field of the Magnets in Circular Accelerators

Description: The leading Lie generators, including the chromatic effects, due to hard-edge fringe field of single multipole and solenoid are derived from the vector potentials within a Hamiltonian system. These nonlinear generators are applied to the interaction region of PEP-II to analyze the linear errors due to the feed-down from the off-centered quadrupoles and solenoid. The nonlinear effects of tune shifts at large amplitude, the synchro-betatron sidebands near half integer and their impacts on the dynamic aperture are studied in the paper.
Date: May 16, 2005
Creator: Cai, Y. & Nosochkov, Yu
Partner: UNT Libraries Government Documents Department

OPTIMIZATION OF THE PHASE ADVANCE BETWEEN RHIC INTERACTION POINTS.

Description: The authors consider a scenario of having two identical Interaction Points (IPs) in the Relativistic Heavy Ion Collider (RHIC). The strengths of beam-beam resonances strongly depend on the phase advance between these two IPs and therefore certain phase advances could improve beam life-time and luminosity. The authors compute the dynamic aperture (DA) as function of the phase advance between these IPs to find the optimum settings.The beam-beam interaction is treated in the weak-strong approximation and a non-linear model of the lattice is used. For the current RHIC proton working point (0.69.0.685) [1] the design lattice is found to have the optimum phase advance. However this is not the case for other working points.
Date: May 16, 2005
Creator: TOMAS, R. & FISCHER, W.
Partner: UNT Libraries Government Documents Department

CONSTRUCTION AND POWER TEST OF THE EXTRACTION KICKER MAGNET FOR SNS ACCUMULATOR RING.

Description: Two extraction kicker magnet assemblies that contain seven individual pulsed magnet modules each will kick the proton beam vertically out of the SNS accumulator ring into the aperture of the extraction Lambertson septum magnet. The proton beam then travels to the 1.4 MW SNS target assembly. The 14 kicker magnets and major components of the kicker assembly have been fabricated in BNL. The inner surfaces of the kicker magnets were coated with TiN to reduce the secondary electron yield. All 14 PFN power supplies have been built, tested and delivered to OWL. Before final installation, a partial assembly of the kicker system with three kicker magnets was assembled to test the functions of each critical component in the system. In this paper we report the progress of the construction of the kicker components, the TIN coating of the magnets, the installation procedure of the magnets and the full power test of the kicker with the PFN power supply.
Date: May 16, 2005
Creator: PAI, C.; HAHN, H.; HSEUH, H.; LEE, Y.; MENG, W.; MI,J. et al.
Partner: UNT Libraries Government Documents Department

MAGNETIC MEASUREMENT SYSTEM FOR THE NSLS SUPERCONDUCTING UNDULATOR VERTICAL TEST FACILITY.

Description: One of the challenges of small-gap superconducting undulators is measurement of magnetic fields within the cold bore to characterize the device performance and to determine magnetic field errors for correction or shimming, as is done for room-temperature undulators. Both detailed field maps and integrated field measurements are required. This paper describes a 6-element, cryogenic Hall probe field mapper for the NSLS superconducting undulator Vertical Test Facility (VTF) [1]. The probe is designed to work in an aperture only 3 mm high. A pulsed-wire insert is also being developed, for visualization of the trajectory, for locating steering errors and for determining integrated multi-pole errors. The pulsed-wire insert will be interchangeable with the Hall probe mapper. The VTF and the magnetic measurement systems can accommodate undulators up to 0.4 m in length.
Date: May 16, 2005
Creator: HARDER, D.; CHOUHAN, S.; LEHECKA, M.; RAKOWSKY, G.; SKARITKA, J. & TANABE, T.
Partner: UNT Libraries Government Documents Department

INTERACTION REGION DESIGN FOR THE ELECTRON-LIGHT ION COLLIDER ELIC.

Description: The Electron-Light Ion Collider ELIC proposed by Jefferson Lab aims at a luminosity in the 10{sup 35} cm{sup -2} sec{sup -1} range for collisions of 150 GeV protons on 7 GeV electrons [1,2]. To achieve these high luminosities, very strong low-{beta} focusing of low-emittance beams is required. Taking advantage of the unequal design proton beam emittances in the two transverse planes, an interaction region design based on superconducting quadrupole doublets has been developed. Compared with the original design in [2], this scheme provides larger beam apertures at lower magnetic fields, while potentially doubling the luminosity.
Date: May 16, 2005
Creator: MONTAG, C. & AL., ET
Partner: UNT Libraries Government Documents Department

DEVELOPMENT OF SUPERCONDUCTING COMBINED FUNCTION MAGNETS FOR THE PROTON TRANSPORT LINE FOR THE J-PARC NEUTRINO EXPERIMENT.

Description: Superconducting combined function magnets will be utilized for the 50 GeV, 750 kW proton beam line for the J-PARC neutrino experiment. The magnet is designed to provide a dipole field of 2.6 T combined with a quadrupole field of 19 T/m in a coil aperture of 173.4 mm at a nominal current of 7345 A. Two full-scale prototype magnets to verify the magnet performance were successfully developed. The first prototype experienced no training quench during the excitation test and good field quality was confirmed.
Date: May 16, 2005
Creator: NAKAMOTO, T.; AJIMA, Y.; FUJII, Y.; HIGASHI, N.; ICHIKAWA, A.; KIMURA, N. et al.
Partner: UNT Libraries Government Documents Department

TEST RESULTS FOR LHC INSERTION REGION DEPOLE MAGNETS.

Description: The Superconducting Magnet Division at Brookhaven National Laboratory (BNL) has made 20 insertion region dipoles for the Large Hadron Collider (LHC) at CERN. These 9.45 m-long, 8 cm aperture magnets have the same coil design as the arc dipoles now operating in the Relativistic Heavy Ion Collider (RHIC) at BNL and are of single aperture, twin aperture, and double cold mass configurations. They are required to produce fields up to 4.14 T for operation at 7.56 TeV. Eighteen of these magnets have been tested at 4.5 K using either forced flow supercritical helium or liquid helium. The testing was especially important for the twin aperture models, whose construction was very different from the RHIC dipoles, except for the coil design. This paper reports on the results of these tests, including spontaneous quench performance, verification of quench protection heater operation, and magnetic field quality.
Date: May 16, 2005
Creator: MURATORE, J.; JAIN, A.; ANERELLA, M.; COSSOLINO, J. & AL., ET
Partner: UNT Libraries Government Documents Department