[en] Beam transfer from the AGS to RHIC is performed in single-bunch mode. Close spacing of the bunches in the collider requires an injection kicker with a rise time of <90 nsec, suggesting adoption of a travelling wave structure. The required vertical kick of 0.186 t·m is provided by 4 magnets, each 1.12 m long with a 48.4 x 48.4 mm aperture and operated at 1.6 kA. The kicker is constructed as a open-quotes Cclose quotes cross section magnet, in which ferrite and high-permittivity dielectric sections alternate. The dielectric blocks provide the capacity necessary for the nominally 25 Ω characteristic impedance of the travelling wave structure, but impose the practical limit on the peak voltage, and thus current, achievable. Computer studies to minimize local electric field enhancements resulted in a configuration capable of holding ∼ 50 kV, with adequate safety margin over the nominal 40 kV. Equivalent circuit analysis indicated the possibility of lowering the nominal voltage by operating mismatched into 20 Ω terminations without degrading the pulse shape. In this paper, the experience gained in the fabrication of the production units and the results from various single-unit tests and operation of four kickers with beam in the open-quotes Sextant Testclose quotes are reported

[en] Two types of degassing sources, a uv lamp and in Infrared (IR) radiant heat lamp, were tested in spare AGS kicker magnets and septum magnets. This paper reports our study of the degassing treatment during pumpdowns of two kicker magnets

[en] Ion beams are transferred from the AGS into RHIC in boxcar fashion as single bunches. The nominal design assumes 60 bunches per ring but increasing the number of bunches to gain luminosity is possible, thereby requiring injection kickers with a shorter rise time. The original injection system consists of traveling-wave dielectric loaded kicker magnets and a Blumlein pulser with a rise time adequate for the present operation. Voltage breakdown in the dielectric kickers suggested the use of all-ferrite magnets. In order to minimize the conversion cost, the design of the all-ferrite kicker uses the same components as the dielectric loaded units. The all-ferrite kickers showed in bench measured good breakdown properties and a current rise time of < 50 ns. A prototype kicker has been installed in the blue ring and was tested with beam. Beam measurements indicate suitability of all-ferrite kicker magnets for upgraded operation

[en] In the vacuum system of particle accelerators most injection and extraction equipment, such as bump magnets, inflectors, kickers and septums, is located inside the vacuum system. This equipment is made of various materials with high outgassing rates which becomes the major sources of gases in the vacuum system. This is the case for Brookhaven's AGS ring where the kicker magnets and the extraction septums, due to their size and construction, usually have the highest outgassing, and have been the cause of several major vacuum failures during AGS operation. Several approaches can be taken to reduce the outgassing of these magnets: (1) redesign and construct the new ones using UHV standards and practices, which will be costly and time-consuming; (2) modify the existing magnets, which will increase the radiation exposure to personnel because the beam loss around these magnets is usually high; (3) install special degassing equipment in the existing magnets. The authors have investigated the third approach by testing two types of degassing sources, a UV lamp and an Infrared (IR) radiant heat lamp, in spare AGS kicker magnets and septum magnets. This paper reports their study of the degassing treatment during pumpdowns of two kicker magnets

[en] The vacuum system of the Alternating Gradient Synchrotron (AGS) at Brookhaven National Laboratory has more than a thousand metal vacuum seals. Also, numerous elastomer seals are used throughout the AGS to seal large beam component chambers. An accelerator upgrade program is being implemented to reduce the AGS operating pressure by x100 and improve the reliability of the vacuum system. This paper describes work in progress on metal and elastomer vacuum seals to help meet those two objectives. Tests are reported on the sealing properties of a variety of metal seals used on different sealing surfaces. Results are also given on reversible sorption properties of certain elastomers. 16 refs., 6 figs., 4 tabs

[en] Three years ago a program was initiated at Brookhaven National Laboratory to upgrade the Alternating Gradient Synchrotron (AGS) vacuum system. The three objectives of this work were to: (1) improve the vacuum system reliability; (2) improve its maintainability; and (3) improve its operating pressure from the present 2-3 x 10^-7 Torr to < 10^-8 Torr. This paper discusses how these objectives can be met. 9 refs., 8 figs., 1 tab

[en] A brief over-view of the subject of sealography was given. Those results will be published elsewhere. However, results of metal vacuum seal tests, conducted at Brookhaven National Laboratory will be herein summarized. The paper then summarizes results of work done by the first author, at the Stanford Linear Acceleration Center, on the extended outgassing properties of elastomers including Viton reg-sign and Buna N reg-sign

[en] The purpose of the injection kicker is to provide the ultimate deflection to the incoming beam from the Alternating Gradient Synchrotron (AGS) into the Relativistic Heavy Ion Collider (RHIC). The beam is kicked in the vertical direction to place it on the equilibrium orbit of RHIC. Each bunch in the AGS is transferred separately, and stacked box-car fashion in the appropriate RHIC rf bucket. In order to achieve the required deflection angle four magnets powered by four pulsers will be used for each ring of RHIC. When the bunches are stacked in RHIC the last few rf buckets are left unfilled in order to provide a gap in the beam to facilitate the ejection or beam abort process. This also means there is not a severe constraint on the fall-time of the injection kicker. One prototype pulser has been built and tested. Much of the development effort has gone into the magnet design. Although lumped ferrite magnets are simpler to build and require less power to reach full field, a transmission line magnet was developed because of the very fast rise-time requirement and the tolerances imposed on the field variation and ripple

[en] In excess of a thousand metal vacuum seals are used in the vacuum system of the Alternating Gradient Synchrotron (AGS) at Brookhaven National Laboratory. Numerous elastomer seals are used throughout the AGS to seal large beam component chambers. An accelerator upgrade program is being implemented to reduce the AGS operating pressure by a factor of 100 and improve the reliability of the vacuum system. This paper describes work in progress on metal and elastomer vacuum seals to help meet these two objectives. Tests are reported on the sealing properties of a variety of metal seals used with different sealing surfaces. Results are also given on reversible sorption properties of certain elastomers. (author)

[en] Coherent electron cooling (CEC) has a potential to significantly boost luminosity of high-energy, high-intensity hadron-hadron and electron-hadron colliders*. In a CEC system, a hadron beam interacts with a cooling electron beam. A perturbation of the electron density caused by ions is amplified and fed back to the ions to reduce the energy spread and the emittance of the ion beam. To demonstrate the feasibility of CEC we propose a proof-of-principle experiment at RHIC using one of JLab's SRF cryo-modules. In this paper, we describe the experimental setup for CeC installed into one of RHIC's interaction regions. We present results of analytical estimates and results of initial simulations of cooling a gold-ion beam at 40 GeV/u energy via CeC.