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Development and Coil Fabrication for the LARP 3.7-m Long Nb3Sn Quadrupole

Description: The U.S. LHC Accelerator Research Program (LARP) has started the fabrication of 3.7-m long Nb{sub 3}Sn quadrupole models. The Long Quadrupoles (LQ) are 'Proof-of-Principle' magnets which are to demonstrate that Nb{sub 3}Sn technology is mature for use in high energy particle accelerators. Their design is based on the LARP Technological Quadrupole (TQ) models, developed at FNAL and LBNL, which have design gradients higher than 200 T/m and an aperture of 90 mm. The plans for the LQ R&D and a … more
Date: August 17, 2008
Creator: Ambrosio, G.; Andreev, N.; Anerella, M.; Barzi, E.; Bossert, R.; Caspi, S. et al.
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Partner: UNT Libraries Government Documents Department
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MEASURING BETA FUNCTION AND PHASE ADVANCE IN RHIC WITH AN AC DIPOLE.

Description: High energy hadron collider operation requires accurate measurements of the beta functions and phase advances, to check the linear optics and to locate gradient errors. During the RHIC 2003 run, two AC dipoles with vertical and horizontal magnetic field [1] were used to measure the linear optics at storage and at injection energies. The two AC dipoles are set up to adiabatically induce sizable coherent oscillations at a frequency close to the betatron frequencies. The beta functions and phase a… more
Date: May 12, 2003
Creator: BAI,M. PEGGS,S. ROSER,T. SATOGATA,T.
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Partner: UNT Libraries Government Documents Department
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RHIC Vertical AC Dipole Commissioning

Description: The RHIC vertical ac dipole was installed in the summer of 2001. The magnet is located in the interaction region between sector 3 and sector 4 common to both beams. The resonant frequency of the ac dipole was first configured to be around half of the beam revolution frequency to act as a spin flipper. At the end of the RHIC 2002 run, the ac dipole frequency was reconfigured for linear optics studies. A 0.35 mm driven betatron oscillation was excited with the vertical ac dipole and the vertical … more
Date: June 2, 2002
Creator: Bai, M.; DeLong, J.; Hoff, L.; Pai, C.; Peggs, S.; Piacentino, J. et al.
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Partner: UNT Libraries Government Documents Department
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RHIC AC Dipole Design and Construction

Description: Two ac dipoles with vertical and horizontal magnetic field have been proposed at RHIC for applications in linear and non-linear beam dynamics and spin manipulations. A magnetic field amplitude of 380 Gm is required to produce a coherent oscillation of 5 times the rms beam size at the top energy. We take the ac dipole frequency to be 1.0% of the revolution frequency away from the betatron frequency. To achieve the strong magnetic field with minimum power loss, an air-core magnet with two seven t… more
Date: June 18, 2001
Creator: Bai, M.; Meth, M.; Pai, C.; Parker, B.; Peggs, S.; Roser, T. et al.
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Partner: UNT Libraries Government Documents Department
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RHIC AC Dipole Design and Construction

Description: Two ac dipoles with vertical and horizontal magnetic field have been proposed at RHIC for applications in linear and non-linear beam dynamics and spin manipulations. A magnetic field amplitude of 380 Gm is required to produce a coherent oscillation of 5 times the rms beam size at the top energy. We take the ac dipole frequency to be 1.0% of the revolution frequency away from the betatron frequency. To achieve the strong magnetic field with minimum power loss, an air-core magnet with two seven t… more
Date: June 18, 2001
Creator: Bai, M.; Meth, M.; Pai, C.; Parker, B.; Peggs, S.; Roser, T. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Feasibility of Positron Emission Tomography of Dose Distribution in Proton Beam Cancer Therapy.

Description: Proton therapy is a treatment modality of increasing utility in clinical radiation oncology mostly because its dose distribution conforms more tightly to the target volume than x-ray radiation therapy. One important feature of proton therapy is that it produces a small amount of positron-emitting isotopes along the beam-path through the non-elastic nuclear interaction of protons with target nuclei such as {sup 12}C, {sup 14}N, and {sup 16}O. These radioisotopes, mainly {sup 11}C, {sup 13}N and … more
Date: June 3, 2002
Creator: Beebe-Wang, J. J.; Dilmanian, F. A.; Peggs, S. G.; Schlyeer, D. J. & Vaska, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electron Cooling for RHIC.

Description: We introduce plans for electron-cooling of the Relativistic Heavy Ion Collider (RHIC). This project has a number of new features as electron coolers go: It will cool 100 GeV/nucleon ions with 50 MeV electrons; it will be the first attempt to cool a collider at storage-energy; and it will be the first cooler to use a bunched beam and a linear accelerator as the electron source. The linac will be superconducting with energy recovery. The electron source will be based on a photocathode gun. The pr… more
Date: June 18, 2001
Creator: Ben-Zvi, Ilan; Ahrens, L.; Brennan, M.; Harrison, M.; Kewisch, J.; MacKay, W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Fermilab main injector dipole construction techniques and prototype magnet measurements

Description: The Fermilab Main Injector Project will provide 120--150 GeV Proton and Antiproton Beams for Fermilab Fixed Target Physics and Colliding Beams Physics use. A dipole magnet has been designed and prototypes constructed for the principal bending magnets of this new accelerator. The design considerations and fabrication techniques are described. Measurement results on prototypes are reported, emphasizing the field uniformity achieved in both body field and end field at excitation levels from inject… more
Date: September 1, 1991
Creator: Bleadon, M.; Brown, B.; Chester, N.; Desavouret, E.; Garvey, J.; Glass, H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Comments on the Behavior Of. Alpha. Sub 1 in Main Injector. Gamma. Sub T Jump Schemes

Description: Tracking studies of transition crossing in the Main Injector have shown that the Johnsen effect is the dominant cause of beam loss and emittance blow up. To suppress this effect one has to have control over {alpha}{sub 1} (dispersion of the momentum compaction factor {alpha}). Various {gamma}{sub t} jump configurations are examined and the resulting changes in {alpha}{sub 1} are assessed. These results are further validated by comparison between the simulation and simple analytic {alpha}{sub 1}… more
Date: May 1, 1991
Creator: Bogacz, S. A. & Peggs, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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STUDIES ON SEXTUPOLE COMPONENTS GENERATED BY EDDY CURRENTS IN THE RAPID CYCLING MEDICAL SYNCHROTRON.

Description: The Rapid Cycling Medical Synchrotron is a second generation medical accelerator that it has been designed with a repetition frequency of 30 Hz. This repetition frequency is far above the typical repetition frequency used in medical accelerators. An elliptical beam pipe has been chosen for the RCMS design in order to win as much physical aperture as possible while keeping the magnet dimensions as small as possible. Rapid Cycling induces Eddy current in the magnets. Eddy currents and elliptical … more
Date: May 12, 2003
Creator: CARDONA,J. ABELL,D. T. PEGGS,S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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RHIC OPTICS MEASUREMENTS AT DIFFERENT WORKING POINTS.

Description: Working point scans at RHIC were performed during 2004 to determine the effect on lifetime and luminosity. Linear optics were measured for different working point tunes by exciting coherent oscillations with the aid of RHIC AC dipoles. Two methods are currently used to measure the beta functions and phases advances: a conventional fitting technique, and an alternate method based on singular value decomposition (SVD). This paper focuses on the effect of working point on the measurement of linear… more
Date: July 5, 2004
Creator: Calaga, R.; Bai, M.; Peggs, S.; Roser, T. & Satogata, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design of the RCMS Lattice Optics

Description: THE RAPID CYCLING MEDICAL SYNCHROTRON (RCMS) IS DESIGNED TO BE A VERY LIGHT AND INEXPENSIVE ACCELERATOR. THIS IS POSSIBLE DUE TO THE SMALL BEAM SIZE THAT HAS BEEN CHOSEN EARLY DURING THE DESIGN STAGE. THIS CHOICE HAS IMPLICATIONS IN THE DESIGN OF THE LATTICE OPTICS. IN THIS PAPER, WE PRESENT AN OVERVIEW OF THE RCMS OPTICS LATTICE, THE KIND OF MAGNETS TO BE USED AND ALSO A DESCRIPTION OF A SPECIAL OPTIC MODULE THAT MATCHES THE ROTATING GANTRY WITH THE REST OF THE FIXED ACCELERATOR. TECHNIQUESDEV… more
Date: June 2, 2002
Creator: Cardona, J.; Kewisch, J. & Peggs, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Measuring Local Gradient and Skew Quadrupole Errors in Rhic Irs.

Description: The measurement of local linear errors at RHIC interaction regions using an ''action and phase'' analysis of difference orbits has already been presented. This paper evaluates the accuracy of this technique using difference orbits that were taken when known gradient errors and skew quadrupole errors were intentionally introduced. It also presents action and phase analysis of simulated orbits when controlled errors are intentionally placed in a RHIC simulation model.
Date: July 5, 2004
Creator: Cardona, J.; Peggs, S.; Pilat, R. & Ptitsyn, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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ACTION AND PHASE ANALYSIS TO DETERMINE SEXTUPOLE ERRORS IN RHIC AND THE SPS.

Description: Success in the application of the action and phase analysis to find linear errors at RHIC Interaction Regions [1] has encouraged the creation of a technique based on the action and phase analysis to find non linear errors. In this paper we show the first attempt to measure the sextupole components at RHIC interaction regions using the action and phase method. Experiments done by intentionally activating sextupoles in RHIC and in SPS [2] will also be analyzed with this method. First results have… more
Date: May 12, 2003
Creator: Cardona, J.; Peggs, S.; Satogata, T. & Tomas, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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