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in creator/contributor: "Taylor, C."

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Alternative dipole magnets for ISABELLE

A dipole magnet, intended as a possible alternative for the ISABELLE main-ring magnet, was designed at LBL. Three layers of FNAL Doubler/Saver conductor were used. Two 1.3-m-long models were built and tested, both with and without an iron core, and in both helium I and helium II. The training behavior, cyclic energy loss, point of quench initiation, and quench velocity were determined. A central field of 6.5 tesla was obtained in He I (4.4 K), and 7.6 tesla in He II (1.8K).

Date: May 1, 1982

Creator: Taylor, C.; Althaus, R.; Caspi, S.; Gilbert, W.; Hassenzahl, W.; Meuser, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High-field superconducting accelerator magnets

The next generation of accelerators for high-energy physics will require high-field, small-bore dipole magnets: in the region of 10 T and 40-mm diam. For such magnets, there is a great incentive to attain high overall current density through increasing the current density within the superconductor and minimizing the copper stabilizer. Both Nb-Ti operating at 1.8 K and Nb/sub 3/sn at 4.2 are candidate superconductors. Two programs in the US and one in Japan are directed toward the development of… more

Date: May 1, 1982

Creator: Taylor, C.; Meuser, R.; Caspi, S.; Gilbert, W.; Hassenzahl, W.; Peters, C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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An alternate end design for SSC dipoles

Experience in the SSC dipole program has shown that fabrication of cylindrical coil ends is difficult. Cable stiffness requires large forces to maintain the proper position of the conductors in the end during winding. After winding, the coil ends remain distorted nd significant motion of the need conductors is required to force the coil end into the molding cavity. Local mechanical stresses are high during this process and extra pieces of insulation are required to prevent turn-to-turn shorts f… more

Date: February 1, 1989

Creator: Peters, C.; Caspi, S. & Taylor, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Stability in accelerator dipoles in He I and He II

Several epoxy-free magnets of 76 and 130 mm diameter have been constructed and tested at Lawrence Berkeley Laboratory. This report describes results of tests at 1.8 and 4.4 K on two recently completed magnets and presents some earlier data on heater induced quenches also at 1.8 and 4.4 K.

Date: November 1, 1981

Creator: Hassenzahl, W.; Gilbert, W.; Taylor, C.; Caspi, S.; Rechen, J. & Meuser, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Short sample testing facility for the Superconducting Super Collider

In this paper we present the system requirements of the apparatus measuring the short sample critical current of the cable for the Superconducting Super Collider (SSC), and the current status of our development work. Key features of the system presented here are: a sample holder which clamps the samples sufficiently well such that no training quenches are required to perform critical current measurements and another which may allow for faster sample mounting; voltage tap boards using a printed-… more

Date: June 1, 1989

Creator: Zbasnik, J.; Scanlan, R.; Taylor, C.; Peters, C.; Pope, W. & Royet, J. (Lawrence Berkeley Lab., CA (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Progress toward 10 tesla accelerator dipoles

A 9.1 T central field has been achieved in a Nb-Ti dipole operating in pressurized helium II at 1.8 K. Three different Nb-Ti dipoles, without iron yokes, have achieved central fields of 8.0, 8.6, and 9.1 T - all short sample performance for the conductors at 1.8 K. In helium I, at 4.3 K, the maximum central fields are from 1.5 to 2.0 T lower. Ten-tesla magnets have been designed for both Nb-Ti operating at 1.8 K and Nb/sub 3/Sn operating at 4.2 K. They are based on a very small beam aperture, (… more

Date: August 1, 1983

Creator: Hassenzahl, W.; Gilbert, G.; Taylor, C. & Meuser, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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SSC (Superconducting Super Collider) magnet technology

To minimize cost of the SSC facility, small-bore high field dipole magnets have been developed;some of the new technology that has been developed at several U.S. national laboratories and in industry is summarized. Superconducting wire with high J/sub c/ and filaments as small as 5..mu..m diameter is not produced iwht mechanical properties suitable for reliable cable production. A variety of collar designs of both aluminum and stainless steel have been used in model magnets. A low-heat leak pos… more

Date: September 1, 1987

Creator: Taylor, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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LBL program of 1 meter long, 50 mm diameter bore, dipoles with fields greater than 8 tesla

Model dipole superconducting magnets with central fields above 8 tesla are being developed for future multi-TeV colliding beam accelerators. The first three models are 1 meter long, have nominal 50 mm diameter cold bores, and utilize Nb-Ti superconductor operating in He II at 1.8 K. None of the three models had an iron flux-return yoke. The maximum central fields achieved are 8.0, 8.6, and 9.1 tesla - all short-sample performance at 1.8 K for the conductors used. At 4.3 K the maximum central fi… more

Date: August 1, 1983

Creator: Hassenzahl, W.; Gilbert, W.; Taylor, C. & Meuser, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Investigation on the enhancement of the critical current densities in bronze-process Nb/sub 3/Sn

The work reported here addressed the problem of improving the critical current characteristic of a comercial multifilamentary Nb/sub 3/Sn strand by varying its heat treatment. The work was done from the perspective that the critical current characteristic is controlled by the metallurgical state of the reacted layer, which is, in turn, fixed by the processing the wire has undergone. The research was carried out in parallel with metallographic studies which analyzed the microstructure and compos… more

Date: October 1, 1981

Creator: Hong, M.; Wu, I.W.; Morris, J.W. Jr.; Gilbert, W.; Hassenzahl, W.V. & Taylor, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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9. 1-T iron-free Nb-Ti dipole magnet with pancake windings

An eight-pancake Nb-Ti dipole magnet, with bent up ends, called D-108B has been built and tested. This magnet is a Nb-Ti version of a Nb/sub 3/Sn magnet designed to produce a 10-tesla dipole field in a 40 mm diameter aperture. The pancack design is used for the heavy 12,000 ampere Nb/sub 3/Sn cable because of the mechanical difficulty in winding such a heavy cable into the conventional nested cylindrical shell configuration with a 2'' inner winding diameter. The Nb-Ti version operates at 1.8K, … more

Date: March 1, 1983

Creator: Gilbert, W.; Caspi, S.; Hassenzahl, W.; Meuser, R.; Peters, C.; Rechen, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design and performance of 40 mm, 6. 5 T, collared, cold-iron model magnets

Model magnets have been built and tested at the Lawrence Berkeley Laboratory to verify a candidate design for the main bending magnets of the SSC. Construction of this series of dipole models was begun in October 1984 and will be completed in October 1985. To date, three models with collars, C1, C2, and C3, have been completed. Models C1 and C2 have been tested.

Date: May 1, 1985

Creator: Peters, C.; Gilbert, W.; Hassenzahl, W.; Mirk, K.; Rechen, J.; Scanlan, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Training of LBL-SSC model dipole magnets at 1. 8 K

We present the 1.8K training behavior of SSC Magnets, several of which have reached a peak current of 9400 A; a central field of 9 Tesla. For the SSC Project, more than 30 one meter long dipole magnets have been built and tested. The test results for the 4.3K operation have been presented previously. Magnet operation, primarily reaching design field without premature training, is expected to be superior in superfluid helium at 1.8K as compared with helium I at 4.3K. Not only is the critical cur… more

Date: March 1, 1989

Creator: Gilbert, W.S.; Althaus, R.; Benjegerdes, R.; Caspi, S.; Peters, C.; Rechen, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High-capacity, high-strength trailer designs for the GA-4/GA-9 Casks

General Atomics (GA) is developing final designs for two dedicated legal-weight trailers to transport the GA-4 and GA-9 Spent-Fuel Casks. The basic designs for these high-capacity, high-strength trailers are essentially identical except for small modifications to account for the differences in cask geometry. We are designing both trailers to carry a 55,000 lb (24,900 kg) payload and to withstand a 2.5 g vertical design load. The GA-4 and GA-9 trailers are designed for significantly higher loads… more

Date: January 1, 1991

Creator: Kissinger, J.A.; Rickard, N.D.; Taylor, C. & Zimmer, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Technology of superconducting accelerator dipoles

We discuss accelerator dipoles and their characteristics. Other types of magnets, in particular bubble chamber magnets have been quite successful. Their performance is based on cryogenic stability which is addressed only briefly in this chapter. This type of stability is not available to the accelerator designer because of the large quantities of copper or other stabilizer that would reduce the current density in the windings to an unacceptably low value.

Date: June 1, 1983

Creator: Hassenzahl, W.V.; Meuser, R.B. & Taylor, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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NC515: a new dipole cross-section for SSC

A new dipole cross-section for SSC is outlined which has multipole coefficients of less than 1.0 x 10/sup -6/ of the dipole field (or 0.01 units) at 1.0 cm. This cross-section has four conductor blocks (three wedges, sixteen turns) in the inner layer and tow conductor blocks (one wedge, twenty turns) in the outer layer. The two layers were formed from the same types of ''partially-keystoned'' cable used in model magnets at LBL and BNL. Based on present cable design an operating field of 6.6 T a… more

Date: January 1, 1986

Creator: Caspi, S.; Helm, M.; Laslett, L.J. & Taylor, C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Magnetic measurements at Lawrence Berkeley Laboratory

Recent magnetic measurement activities at LBL have been concentrated in two separate areas, electro-magnets and permanent magnets for the Advanced Light Source (ALS), and superconducting magnets for the Superconducting Super Collider Laboratory (SSCL). A survey of the many different measurement systems is presented. These include: AC magnetic measurements of an ALS booster dipole engineering model magnet, dipole moment measurements of permanent magnet blocks for ALS wigglers and undulators, per… more

Date: August 1, 1991

Creator: Green, M.I.; Barale, P.; Callapp, L.; Case-Fortier, M.; Lerner, D.; Nelson, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nb/sub 3/Sn dipole magnet reacted after winding

A 5 cm bore dia., 1-m-long dipole model magnet was constructed by winding un-reacted cable, followed by reaction and epoxy-impregnation. Experience and test results are described on the 1.7 mm dia. internal-tin wire, the eleven-strand flattened cable, fiberglass insulation, and construction of the magnet. Each half of the magnet has two double-pancake-type windings that were reacted in a single operation. The two double-pancakes were then separately vacuum impregnated after soldering the flexib… more

Date: September 1, 1984

Creator: Taylor, C.; Scanlan, R.; Peters, C.; Wolgast, R.; Gilbert, W.; Hassenzahl, W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Superconducting sextupole correction coil operating in persistent mode

Error fields in a dipole due to superconductor magnetization and conductor misplacements add unwanted multipole, mainly sextupole and decapole, terms to the desired dipole field. Two persistent mode sextupole correction coils inside the bore of model SSC dipoles have been built and tested. A shorted superconducting sextupole coil has a current induced in it by the error sextupole field such that no sextupole field can penetrate into the proton beam region. The correction sextupole coils are one… more

Date: September 1, 1984

Creator: Gilbert, W.; Borden, A.; Hassenzahl, W.; Mortiz, G. & Taylor, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Use of tapered key collars in dipole models for the SSC

Three one-meter SSC type dipole magnet models have been constructed and tested using tapered keys to lock interleaving aluminum alloy collars around the coils. This design enables the coil prestress to be created by hoop tention in the collars as the keys are pressed in. This method minimizes the high coil overstress required to insert traditional non-tapered keys. In particular, collaring may be accomplished without exceeding 10,000 psi coil pressure while producing in excess of 7500 psi coil … more

Date: September 1, 1987

Creator: Peters, C.; Mirk, K.; Wandesforde, A. & Taylor, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Novel epoxy-free construction method for fabricating dipole magnets and test results

Three model superconducting dipole magnets, lm length and having a bore diameter of 76mm, fabricated without epoxy resins or other adhesives, have been built and the first two have been tested in He I and He II. The conductor is the 23-strand Rutherford-type cable used in the Fermilab Doubler/Saver magnets, and is insulated with Mylar and Kapton. The two-layer winding is highly compessed by a system of structural support rings and tapered collets. Little training was required. Quench currents g… more

Date: March 1981

Creator: Taylor, C.; Althaus, R.; Caspi, S.; Gilbert, W.S.; Hassenzahl, W.; Meuser, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Large scale superfluid practice

Since 1979 Lawrence Berkeley Laboratory has been testing superconducting magnets in He II. The 1 atm pressure, 1.8 K, He II, test facility, is an integral part of the LBL Research and Development program on high field superconducting dipole magnets for particle accelerators. Some of the experience gained in this facility and the details of its operation are reported.

Date: July 1, 1982

Creator: Caspi, S.; Taylor, C.; Gilbert, W.S.; Hassenzahl, W.; Rechen, J. & Warren, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Conceptual magnet design for an iron-free colliding beam accelerator

Superconducting accelerator magnets usually have magnetic iron yokes to obtain maximum magnetic field and to limit stray field. However, the iron is expensive and heavy. The smaller size and weight of an iron-free magnet can result in lower magnet and refrigeration costs. However in a colliding beam accelerator the stray field from one ring produces aberrations in the field in the other. A way to eliminate this mutual interference is to surround each magnet with a coil that exactly cancels the … more

Date: March 1, 1983

Creator: Taylor, C. & Meuser, R.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Design of a 10-T superconducting dipole magnet using niobium-tin conductor

In order to minimize the size and cost of conventional facilities - land, tunneling, shielding, cryogenic and vacuum system - the dipole magnets for the next generation of particle accelerators must produce as strong a magnetic field as possible. Ten tesla seems to be a reasonable goal, and can be attained by using either niobium-tin conductor at 4.2 K or niobium-titanium at 1.8 K. The beam diameter in a multi-TeV accelerator, can in principle, be quite small, say 20 mm, depending on the design… more

Date: November 1, 1982

Creator: Taylor, C.; Meuser, R.; Caspi, S.; Gilbert, W.; Hassenzahl, W.; Peters, C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

40 mm bore Nb-Ti model dipole magnet

Preliminary R and D has been started on magnets for a next-generation high-energy-physics accelerator, the 20 TeV Superconducting Supercollider (SSC). One design now being developed at LBL is described in this paper. The design is based on two layers of flattened Nb-Ti cable, a 40 mm ID winding with flared ends, and an operating field of 6.5 T. Experimental results are presented on several one-meter-long models tested at both He I and He II temperature. Measurement of field, residual magnetizat… more

Date: September 10, 1984

Creator: Taylor, C.; Gilbert, W.; Hassenzahl, W.; Meuser, R.; Peters, C.; Rechen, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department