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Production techniques for measuring SSC (Superconducting Super Collider) accelerator magnets

Description: This paper reviews plans for the formidable task of measuring SSC accelerator magnets. The focus is on measurements of the dipoles for the two collider rings. The magnitude of the job is summarized. The required accuracy of the measurements is discussed in terms of SSC accelerator requirements and expected magnet production tolerances. The measuring system which will be used for the first 16.6 m SSC dipoles is described.
Date: January 1, 1986
Creator: Wanderer, P.
Partner: UNT Libraries Government Documents Department

Summary of field quality data from SSC R and D dipoles

Description: The field quality data from the R and D SSC 4.5m-long dipoles are summarized and compared to SSC requirements. In most respects, the magnets exceed the requirements. Modifications incorporated into the 16.6m magnets are expected to correct the few deficiencies. Specific aspects of the magnet design are discussed in terms of their effect on particular multipoles and the time required for modifications.
Date: July 1, 1986
Creator: Wanderer, P.
Partner: UNT Libraries Government Documents Department

Quench plateau, coil cure temperature, and copper-to-superconductor ratio in recent 1. 8 m SSC model dipoles

Description: The ratio of the conductor-limited quench currents to the short-sample prediction, I[sub Q]/I[sub ss], is tabulated for a series of 1.8 m-long SSC model collider dipoles. Sixteen of these magnets have 40 mm aperture, four have 50 mm aperture. For these magnets, the coil cure temperature ranged from 135 C to 217 C and the ratio of copper-to-superconductor ranged from 1.27 to 1.54. At 4.35 K, the value of I[sub Q]I[sub ss] was between 1.00 and 1.04 with no clear dependence on cure temperature or Cu:S.C. ratio.
Date: January 1, 1992
Creator: Wanderer, P.
Partner: UNT Libraries Government Documents Department

Summary of construction details and test performance of recent series of 1. 8 meter SSC dipoles at BNL

Description: Certain design features of the SSC dipole magnets are evaluated with 1.8-meter models built and tested at BNL. We report the results of recent tests of such magnets relating quench performance and field quality measurements to mechanical design and assembly features such as collar material, collared coil dimensions and fit with the yoke and coil prestress level. 9 figs., 5 tabs.
Date: January 1, 1990
Creator: Goodzeit, C. & Wanderer, P.
Partner: UNT Libraries Government Documents Department

Quench plateau, coil cure temperature, and copper-to-superconductor ratio in recent 1.8 m SSC model dipoles

Description: The ratio of the conductor-limited quench currents to the short-sample prediction, I{sub Q}/I{sub ss}, is tabulated for a series of 1.8 m-long SSC model collider dipoles. Sixteen of these magnets have 40 mm aperture, four have 50 mm aperture. For these magnets, the coil cure temperature ranged from 135 C to 217 C and the ratio of copper-to-superconductor ranged from 1.27 to 1.54. At 4.35 K, the value of I{sub Q}I{sub ss} was between 1.00 and 1.04 with no clear dependence on cure temperature or Cu:S.C. ratio.
Date: December 31, 1992
Creator: Wanderer, P.
Partner: UNT Libraries Government Documents Department

EXOTIC MAGNETS FOR ACCELERATORS.

Description: Over the last few years, several novel magnet designs have been introduced to meet the requirements of new, high performance accelerators and beam lines. For example, the FAIR project at GSI requires superconducting magnets ramped at high rates ({approx} 4 T/s) in order to achieve the design intensity. Magnets for the RIA and FAIR projects and for the next generation of LHC interaction regions will need to withstand high doses of radiation. Helical magnets are required to maintain and control the polarization of high energy protons at RHIC. In other cases, novel magnets have been designed in response to limited budgets and space. For example, it is planned to use combined function superconducting magnets for the 50 GeV proton transport line at J-PARC to satisfy both budget and performance requirements. Novel coil winding methods have been developed for short, large aperture magnets such as those used in the insertion region upgrade at BEPC. This paper will highlight the novel features of these exotic magnets.
Date: September 18, 2005
Creator: WANDERER, P.
Partner: UNT Libraries Government Documents Department

Solenoid spectrometer magnets

Description: Three solenoid detectors are considered for Isabelle. They are characterized by their diameters of 3, 5, and 8 meters. The size of an experimental hall is then considered, taking into account the likely physics goals, detector and return yoke geometries, thickness of superconducting coils, necessary space for detector repair, etc. Comments and major conclusions are presented. (GHT)
Date: unknown
Creator: Baltay, C.; Danby, G.; Mishina, M.; Wanderer, P. & Willis, W.
Partner: UNT Libraries Government Documents Department

Construction and testing of arc dipoles and quadrupoles for the relativistic heavy ion collider (RHIC) at BNL

Description: The production run of superconducting magnets for the Relativistic Heavy Ion Collider (RHIC) project at Brookhaven National Laboratory (BNL) is well underway. Of the 288 arc dipoles needed for the collider, more than 120 have been delivered. More than 150 arc quadrupoles have been delivered. All of these magnets have been accepted for RHIC. This paper reports the construction and performance of these magnets. Novel features of design and test, introduced to enhance technical performance and control costs, are also discussed. Other papers submitted to this Conference summarize work on the sextupoles and tuning quads, arc correctors, and combined corrector-quadrupole-sextupole assemblies (CQS).
Date: May 1, 1995
Creator: Wanderer, P.; Muratore, J. & Anerella, M.
Partner: UNT Libraries Government Documents Department

Magnetization, critical current, and injection field harmonics in superconducting accelerator magnets

Description: The very large energy ratio of machines such as the SSC dictates rather low injection field (for 6T, 20 TeV it is approximately 0.3T). Since the harmonic content at such low fields is largely determined by magnetization currents in the superconductor, the random errors depend on the uniformity of the superconducting wire. In principle the magnitude of the residual fields can be reduced indefinitely by using finer filaments, but in practice there is a lower limit of a few microns. We have compared the injection field harmonics for a number of accelerator dipoles with magnetization measurements made on samples of the conductor used to wind the coils. In addition both the magnetization and harmonics have been compared with short sample critical current measurements made at 5T. The results indicated that an accurate estimate of the variation in injection field harmonics can only be obtained from direct measurements of the magnetization of the cable. It appears feasible to use such measurements to ''shuffle'' magnets for a large accelerator by predicting the low field properties of a magnet before actually winding the coils. 10 refs., 4 figs., 2 tabs.
Date: January 1, 1985
Creator: Ghosh, A.K.; Sampson, W.B. & Wanderer, P.
Partner: UNT Libraries Government Documents Department

Detecting heavy flavors at CBA

Description: In the CBA luminosity range (L approx. = 10/sup 32/-10/sup 33/cm/sup -2/sec/sup -1/) the expected rate of bare heavy flavor production is high enough to allow for detection schemes which rely on relatively small leptonic branching ratios. These provide a clean separation of the signal from the gluon plus light quark background, while retaining sufficient statistics for further study. The current status of the investigation of lepton-related triggers and cuts is presented, and the jet topologies of events (both signal and background) with high-P/sub T/ leptons are discussed. While these studies have been carried out with samples of high-P/sub T/ q anti q and gluon jets generated with ISAJET, other sources of heavy flavor production at CBA are surveyed.
Date: March 1, 1983
Creator: Aronson, S.; Ogilvie, M.; Stumer, I.; Tanaka, M. & Wanderer, P.
Partner: UNT Libraries Government Documents Department

Random errors in the magnetic field coefficients of superconducting magnets

Description: Random errors in the multipole magnetic coefficients of superconducting magnet have been of continuing interest in accelerator research. The Superconducting Super Collider (SSC) with its small magnetic aperture only emphasizes this aspect of magnet design, construction, and measurement. With this in mind, we present a magnet model which mirrors the structure of a typical superconducting magnet. By taking advantage of the basic symmetries of a dipole magnet, we use this model to fit the measured multipole rms widths. The fit parameters allow us then to predict the values of the rms multipole errors expected for the SSC dipole reference design D, SSC-C5. With the aid of first-order perturbation theory, we then give an estimate of the effect of these random errors on the emittance growth of a proton beam stored in an SSC. 10 refs., 6 figs., 2 tabs.
Date: January 1, 1985
Creator: Herrera, J.; Hogue, R.; Prodell, A.; Wanderer, P. & Willen, E.
Partner: UNT Libraries Government Documents Department

Quench performance of six similar 17 m-long, 40 mm-aperture SSC model dipoles

Description: The quench performance of the final six 17 m-long, 40 mm-aperture SSC model dipoles made at Brookhaven National Laboratory is presented in summary form. The six magnets are of similar construction, except for two features (1) the copper-to-superconductor ratio of the inner cable (either 1.3:1 or 1.5:1) and (2) the axial Preload at 4.35K. The inner coil quench performance does not appear to be correlated with the copper-to-superconductor ratio. There does appear to be a correlation between the outer coil quench performance and the cold axial preload.
Date: January 1, 1992
Creator: Wanderer, P. & Willen, E.
Partner: UNT Libraries Government Documents Department

Performance of R and D sextupole trim coils for SSC (Superconducting Super Collider) dipoles

Description: For the proposed Superconducting Super Collider (SSC), trim coils placed inside the main coils of the dipoles are needed to correct for field nonuniformities due to superconducting magnetization, iron saturation, and systematic construction errors. Four 4.5 m superconducting sextupole trim coils have been made using methods adapted from printed circuit technology and suitable for mass production. This paper presents measurements of the multipoles and quench currents and compares them with SSC requirements. Based on these results, this type of trim coil (''Multiwire'') looks quite promising for use in the SSC.
Date: January 1, 1987
Creator: Wanderer, P.; Herrera, J.; Thompson, P. & Willen, E.
Partner: UNT Libraries Government Documents Department

A comparison of calculations and measurements of the magnetic characteristics of the SSC (Superconducting Super Collider) design D dipole

Description: Measurements on two 4.5 m long design D dipoles are compared with computer calculations of their harmonics. These two magnets were tested at high fields, up to about 7.5 T, by subcooling.
Date: January 1, 1987
Creator: Gupta, R.C.; Morgan, G.H. & Wanderer, P.
Partner: UNT Libraries Government Documents Department

Workshop on the AGS fixed-target research program

Description: The summarized results of a two day workshop to determine experiment programs for the Brookhaven AGS during the construction period of the ISABELLE storage rings and after are presented. Topics covered include: experiments with low-energy beams; experiments with higher energy beams; neutrino physics; and polarized protons. (GHT)
Date: January 1, 1978
Creator: Ahrens, L.; Schewe, P.; Wanderer, P. & Weisberg, H.
Partner: UNT Libraries Government Documents Department

Design and B-field measurements of a Lambertson injection magnet for the RHIC machine

Description: Two Lambertson-type injection magnets have been designed, constructed and tested magnetically. One magnet is the mirror image of the other and each will serve as an injector in the rings of die Relativistic Heavy Ion Collider (RHIC) accelerators under construction at Brookhaven National Laboratory (BNL). To obtain the required field quality in the injected beam region and low stray fields in the circulating beam region of the magnet, an optimization study was performed using computer codes to provide solutions for a two and three dimensional model of the magnet. The calculations are compared to the magnetic field measurements taken in the injected and circulating beam regions mentioned above. Field inhomogeneities in the injected beam region were less than 6 {times} 10{sup {minus}4}, for either measured or calculated B-fields. The magnetic-field strength in the circulating beam region was less than 0.1 Gauss (measured or calculated). A description of the mechanical design of the magnet as well as a detailed comparison of the measured magnetic fields to those calculated using the two and three dimensional computer codes is presented here.
Date: May 1, 1995
Creator: Tsoupas, N.; Rodger, E.; Claus, J.; Foelsche, H.W. & Wanderer, P.
Partner: UNT Libraries Government Documents Department

SKEW QUADRUPOLES IN RHIC DIPOLE MAGNETS AT HIGH FIELDS.

Description: In the RHIC arc dipoles, the center of the cold mass lies above the center of the cryostat. At the maximum design field, the magnetic flux lines leak through the yoke to the asymmetrically located cryostat, which provides an additional return path. This introduces a systematic top-bottom asymmetry leading to a skew quadrupole term at high fields. A similar asymmetry is also created by any difference in weights of the upper and the lower yoke halves. Data from measurements of several RHIC dipoles are presented to study this effect. In the current production series of the RDIC dipoles, an attempt is made to compensate the effect of the cryostat by an asymmetry in the iron yoke. Seven dipoles with this type of yoke have been cold tested, and show a reduced saturation in the skew quadrupole term, as expected.
Date: June 11, 1995
Creator: JAIN, A.; GUPTA, P.; THOMPSON, P. & WANDERER, P.
Partner: UNT Libraries Government Documents Department

Quench observation using quench antennas on RHIC IR quadrupole magnets

Description: Quench observation using quench antennas is now being performed routinely on RHIC dipole and quadrupole magnets. Recently, a quench antenna was used on a RHIC IR magnet which is heavily instrumented with voltage taps. It was confirmed that the signals detected in the antenna coils do not contradict the voltage tap signals. The antenna also detects a sign of mechanical disturbance which could be related to a training quench. This paper summarizes signals detected in the antenna and discusses possible causes of these signals.
Date: July 1995
Creator: Ogitsu, T.; Terashima, A.; Tsuchiya, K.; Ganetis, G.; Muratore, J. & Wanderer, P.
Partner: UNT Libraries Government Documents Department

Quench antennas for RHIC quadrupole magnets

Description: Quench antennas for RHIC quadrupole magnets are being developed jointly by KEK and BNL. A quench antenna is a device to localize a quench origin using arrays of pick-up coils lined up along the magnet bore. Each array contains four pick-up coils: sensitive to normal sextupole, skew sextupole, normal octupole, and skew octupole field. This array configuration allows an azimuthal localization of a quench front while a series of arrays gives an axial localization and a quench propagation velocity. Several antennas have been developed for RHIC magnets and they are now routinely used for quench tests of production magnets. The paper discusses the description of the method and introduces a measured example using an antenna designed for quadrupole magnets.
Date: May 1, 1995
Creator: Ogitsu, T.; Terashima, A.; Tsuchiya, K.; Ganetis, G.; Muratore, J. & Wanderer, P.
Partner: UNT Libraries Government Documents Department

Skew quadrupole in RHIC dipole magnets at high fields

Description: In the RHIC arc dipoles, the center of the cold mass lies above the center of the cryostat. At the maximum design field, the magnetic flux lines leak through the yoke to the asymmetrically located cryostat, which provides an additional return path. This introduces a systematic top-bottom asymmetry leading to a skew quadrupole term at high fields. A similar asymmetry is also created by any difference in weights of the upper and the lower yoke halves. Data from measurements of several RHIC dipoles are presented to study this effect. In the current production series of the RHIC dipoles, an attempt is made to compensate the effect of the cryostat by an asymmetry in the iron yoke. Seven dipoles with this type of yoke have been cold tested, and show a reduced saturation in the skew quadrupole term, as expected.
Date: July 1, 1995
Creator: Jain, A.; Gupta, P.; Thompson, P. & Wanderer, P.
Partner: UNT Libraries Government Documents Department

Measurement of the magnetic field coefficients of particle accelerator magnets

Description: An important aspect in the development of magnets to be used in particle accelerators is the measurement of the magnetic field in the beam aperture. In general it is necessary to measure the harmonic multipoles in the dipole, quadrupole, and sextupole magnets for a series of stationary currents (plateaus). This is the case for the Superconducting Super Collider (SSC) which will be ramped to high field over a long period (/approximately/1000 sec.) and then remain on the flat top for the duration of the particle collision phase. In contrast to this mode of operation, the Booster ring being constructed for the Brookhaven AGS, will have a fast ramp rate of approximately 10 Hz. The multipole fields for these Booster magnets must therefore be determined ''on the ramp.'' In this way the effect of eddy currents will be taken into account. The measurement system which we will describe in this paper is an outgrowth of that used for the SSC dipoles. It has the capability of measuring the field multipoles on both a plateau or during a fast ramp. In addition, the same basic coil assembly is used to obtain the magnetic multipoles in dipole, quadrupole, and sextupole magnets. 2 refs., 3 figs., 1 tab.
Date: January 1, 1989
Creator: Herrera, J.; Ganetis, G.; Hogue, R.; Rogers, E.; Wanderer, P. & Willen, E.
Partner: UNT Libraries Government Documents Department

Field measuring probe for SSC (Superconducting Super Collider) magnets

Description: The field probe developed for measuring the field in SSC dipole magnets is an adaptation of the rotating tangential coil system in use at Brookhaven for several years. Also known as the MOLE, it is a self-contained room-temperature mechanism that is pulled through the aperture of the magnet with regular stops to measure the local field. Several minutes are required to measure the field at each point. The probe measures the multipole components of the field as well as the field angle relative to gravity. The sensitivity of the coil and electronics is such that the field up to the full 6.6 T excitation of the magnet as well as the field when warm with only 0.01 T excitation can be measured. Tethers are attached to both ends of the probe to carry electrical connections and to supply dry nitrogen to the air motors that rotate the tangential windings as well as the gravity sensor. A small computer is attached to the probe for control and for data collection, analysis and storage. Digital voltmeters are used to digitize the voltages from the rotating coil and several custom circuits control motor speeds in the probe. The overall diameter of the probe is approximately 2 cm and its length is 2.4 m; the field sensitive windings are 0.6 m in length.
Date: March 1, 1987
Creator: Ganetis, G.; Herrera, J.; Hogue, R.; Skaritka, J.; Wanderer, P. & Willen, E.
Partner: UNT Libraries Government Documents Department

Random errors in the magnetic field coefficients of superconducting quadrupole magnets

Description: The random multipole errors of superconducting quadrupoles are studied. For analyzing the multipoles which arise due to random variations in the size and locations of the current blocks, a model is outlined which gives the fractional field coefficients from the current distributions. With this approach, based on the symmetries of the quadrupole magnet, estimates are obtained of the random multipole errors for the arc quadrupoles envisioned for the Relativistic Heavy Ion Collider and for a single-layer quadrupole proposed for the Superconducting Super Collider. (LEW)
Date: January 1, 1987
Creator: Herrera, J.; Hogue, R.; Prodell, A.; Thompson, P.; Wanderer, P. & Willen, E.
Partner: UNT Libraries Government Documents Department