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Multi-layer universal correction magnet

Description: This paper presents an approach for constructing a universal correction magnet in which the return currents play an active role in determining the field. The return currents are not hidden by the iron shield. The coil is wound in many layers, instead of just one layer. Each layer has a particular symmetry, and generates a particular class of field multipoles such that the location of the return current for each independently excited current block is clear. Three layers may be sufficient in many… more
Date: August 1, 1981
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Stop bandwidths of nonlinear beam-beam resonances

Description: A general expression is given for the stop bandwidths, ..delta nu../sub N/, of nonlinear beam-beam resonances, which is expanded in powers of Y(s), the vertical beam orbit, and which is valid under certain assumptions regarding the orbits and charge distributions near the interaction regions. This result is applied to obtain results for the rms ..delta nu../sub N/ due to random vertical orbit errors, and due to random errors in ..beta../sub y/ at the crossing points. Numerical results are given… more
Date: December 8, 1979
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Non-linear variation of the beta function with momentum

Description: A theory is presented for computing the non-linear dependence of the ..beta..-functions on momentum. Results are found for the quadratic term. The results of the theory are compared with computed results. A procedure is proposed for computing the strengths of the sextupole correctors to correct the dependence of the ..beta..-function on momentum.
Date: July 1, 1983
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Correction of the closed orbit and vertical dispersion and the tuning and field correction system in ISABELLE

Description: Each ring in ISABELLE will have 10 separately powered systematic field correction coils to make required corrections which are the same in corresponding magnets around the ring. These corrections include changing the ..nu..-value, shaping the working line in ..nu..-space, correction of field errors due to iron saturation effects, the conductor arrangements, the construction of the coil ends, diamagnetic effects in the superconductor and to rate-dependent induced currents. The twelve insertion q… more
Date: January 1, 1979
Creator: Parzen, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nonlinear chromatic effects in the beta function

Description: A theory is presented for computing the nonlinear dependence of the ..beta..-functions on momentum. Results are found for the quadratic term. The results of the theory are compared with computed results. A procedure is proposed for computing the strengths of the sextupole correctors to correct the dependence of the ..beta..-function on momentum.
Date: January 1, 1983
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Aperture limits due to the presence of higher-magnetic-field multipoles

Description: Superconducting magnets tend to produce magnetic fields which have larger higher systematic multipoles and larger random multipoles than conventional magnets. In superconducting magnets the magnetic field shape is determined by the current distribution rather than the shape of an iron surface. Higher systematic magnetic field multipoles are then generated by necessary deviations of the current distribution from the ideal desired distribution; random multipoles are generated by errors in the loc… more
Date: January 1, 1983
Creator: Parzen, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Intrinsic and resonance space charge limits

Description: The space charge limit in circular proton accelerators has been studied using a simulation program described below. Results from the simulation study indicate a different model for the space charge limit than the often presented models which emphasize resonances due to magnetic field errors. This simulation study suggests that the intrinsic space charge limit plays an important role. The intrinsic space charge limit is the space charge limit, in the absence of magnetic field errors, and is due … more
Date: January 1, 1989
Creator: Parzen, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Strong intrabeam scattering in heavy ion and proton beams

Description: Intrabeam scattering is the scattering of the particles in the beam from each other through the Coulomb forces that act between each pair of particles. This causes the beam dimensions to grow both longitudinally and transversely. In strong intrabeam scattering, the beam dimensions may grow by several fold, and the accelerator aperture is large enough to contain the beam as it grows. The growth rates may be very large initially, but they quickly decrease as the beam increases in size. The growth… more
Date: January 1, 1985
Creator: Parzen, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Intrabeam scattering

Description: Intrabeam scattering is the scattering of the particles in the beam from each other through the Coulomb forces that act between each pair of particles. It depends on the ion charge and mass like Z/sup 4//A/sup 2/ and is usually larger for the heavier ions. In RHIC, extra aperture is provided to allow the beam to grow transversely because of intrabeam scattering. For Au ions, enough aperture has to be provided to allow the transverse emittances to grow by a factor of 3 over 10 hours. The beam wi… more
Date: January 1, 1988
Creator: Parzen, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High energy facilities advanced projects: intrabeam scattering for a beam of gold ions

Description: This note presents the results for the effects of intrabeam scattering on the longitudinal and transverse beam dimensions for a beam of Au nuclei at various energies corresponding to ..gamma.. = 5 to ..gamma.. = 100, and for time periods of up to 10 hours. Intrabeam scattering is the scattering of the particles in the beam from each other through the Coulomb forces that act between each pair of particles. This causes the beam dimensions to grow both longitudinally and transversely, and results … more
Date: June 26, 1984
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Beam-beam interactions in P-P colliding accelerators

Description: Non-linear stop-bands, due to the beam-beam interaction in a P-P colliding accelerator, are computed and used to estimate the strength of the beam-beam interaction. Results for the stop-band widths due to various causes are summarized. These results are used to compare the effects of beam-beam non-linear resonances in the ISR with those in CBA (Colliding Beam Accelerator at BNL), to estimate the effect of a spectrometer magnet placed at one of the beam crossing points, and to compare the beam-b… more
Date: January 1, 1983
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of coupling on intrabeam scattering

Description: The effect of coupling between horizontal and vertical betatron oscillations on the growth of a beam due to a intrabeam scattering has been studied. It was suggested that the presence of coupling may reduce the effects of intrabeam scattering. A procedure is outlined for revising intrabeam scattering theory to include coupling. There is one case where a plausible solution is not difficult to find, and this is the case of complete coupling. In this case, although coupling reduces the initial hor… more
Date: January 1, 1988
Creator: Parzen, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Magnetic fields for transporting charged beams

Description: The transport of charged particle beams requires magnetic fields that must be shaped correctly and very accurately. During the last 20 years or so, many studies have been made, both analytically and through the use of computer programs, of various magnetic shapes that have proved to be useful. Many of the results for magnetic field shapes can be applied equally well to electric field shapes. A report is given which gathers together the results that have more general significance and would be us… more
Date: January 1, 1976
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Possible effects of lowering the periodicity in ISABELLE

Description: The replacement of one or more of the standard insertions by either a low-..beta.. or high-..beta.. insertion will reduce the periodicity of ISABELLE, with resulting effects on the particle dynamics. Some of the possible dynamics effects are listed and discussed.
Date: January 1, 1976
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Error field across the aperture of the ISABELLE dipole

Description: Error field multipoles due to systematic errors in the current distribution are computed and compared with the error field multipoles due to random errors in the current distribution. The systematic field error multipoles are found to vary rapidly across the aperture, and in some cases may be the dominant error multipoles.
Date: July 22, 1976
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Correction coil for random magnetic field errors in a superconducting storage accelerator

Description: Some considerations are given on the relative size of the random nonlinear field errors in the magnets of a superconducting storage accelerator and of a conventional warm accelerator. A possible correction coil is presented for the random field errors in the magnets of a superconducting storage accelerator. This correction coil consists of 24 conductors spaced equally around a circle, 12 of which can be independently excited. Each conductor can carry a maximum current of 1000 A, and has the dim… more
Date: November 12, 1973
Creator: Parzen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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