The Brookhaven National Laboratory electron beam ion source for RHIC

Abstract

As part of a new heavy ion preinjector that will supply beams for the Relativistic Heavy Ion Collider and the National Aeronautics and Space Administration Space Radiation Laboratory, construction of a new electron beam ion source (EBIS) is now being completed. This source, based on the successful prototype Brookhaven National Laboratory Test EBIS, is designed to produce milliampere level currents of all ion species, with q/m=(1/6)-(1/2). Among the major components of this source are a 5 T, 2-m-long, 204 mm diameter warm bore superconducting solenoid, an electron gun designed to operate at a nominal current of 10 A, and an electron collector designed to dissipate approximately 300 kW of peak power. Careful attention has been paid to the design of the vacuum system, since a pressure of 10(-10) Torr is required in the trap region. The source includes several differential pumping stages, the trap can be baked to 400 C, and there are non-evaporable getter strips in the trap region. Power supplies include a 15 A, 15 kV electron collector power supply, and fast switchable power supplies for most of the 16 electrodes used for varying the trap potential distribution for ion injection, confinement, and extraction. The EBIS source and all EBIS power supplies sit on an isolated platform, which is pulsed up to a maximum of 100 kV during ion extraction. The EBIS is now fully assembled, and operation will be beginning following final vacuum and power supply tests. Details of the EBIS components are presented.

Measurement of the total cross section of uranium-uranium collisions atsNN=192.8GeV

“…This was possible because a new Electron Beam Ion Source (EBIS) [27] was recently commissioned that could provide enough intensity for collider operation. The magnetic lattice was selected to provide a large dynamic aperture for on-and off-momentum particles with a beam envelope function β * at the IP slightly larger than in previous years [8].…”

Laser ion source with a double pulse laser system

“…For example, we plan to install a laser ion source for a seed ion beam provider for the RHIC-EBIS in BNL. 2,3 For this project, this technique seems quite useful. We can probably increase the number of laser cavities more than two if needed.…”

Preliminary result of rapid solenoid for controlling heavy-ion beam parameters of laser ion source

“…At Brookhaven National Laboratory (BNL), we developed a LIS (Kondo et al, 2012;Kanesue et al, 2014) to provide singly charged various ions to the electron beam ion source (EBIS) (Alessi et al, 2010). The first beam commissioning was done in March 2014 and since then solid-based ion beams have been provided by the LIS to NASA space radiation laboratory and relativistic heavy-ion collider.…”