Results of beam tests on a high current EBIS test stand
At Brookhaven National Laboratory there is an R&D program to design an Electron Beam Ion Source (EBIS) for use in a compact ion injector to be developed for the Relativistic Heavy Ion Collider (RHIC). The BNL effort is directed at developing an EBIS with intensities of 3/spl times/10/sup 9/ particles/pulse of ions such as Au/sup 35+/ and U/sup 45+/, and requires an electron beam on the order of 10 A. The construction of a test stand (EBTS) with the full electron beam power and 1/3 the length of the EBIS for RHIC is nearing completion. Initial commissioning of the EBTS was made with pulsed electron beams of duration <1 ms and current up to 13 A. Details of the EBTS construction, results of the pulse tests, and preparations for DC electron beam tests are presented.
Possible application of an EBIS in preinjectors for large heavy ion colliders
High energy, heavy ion nuclear physics has so far been limited to experiments with a fixed target. Presently there are two projects that would greatly extend the available collision energy: the Relativistic Heavy Ion Collider (RHIC) under construction at Brookhaven National Laboratory (BNL), and the Large Hadron Collider (LHC) planned at CERN. While RHIC was from the very beginning designed for collisions of all heavy ions up to gold, LHC was initially considered as a p-p and, perhaps eventually, an e-p collider, with the heavy ion option added at a later stage; this option is now included in the planning right from the beginning. The present RHIC scenario for acceleration of gold ions starts with the BNL Tandem injecting Au{sup 14+} ions into the Booster; after acceleration ions are stripped to a charge state of 77+, injected into the AGS, stripped again to 79+ and injected into RHIC, with three bunches per cycle. The LHC scenario for acceleration of lead ions will use as the injector the CERN Heavy Ion Facility: production of ions in a charge state around 27+ in an ECR ion source, followed by an RFQ/linac combination, stripping to Pb{sup 53+} at 4.2 MeV/u, acceleration in themore » PSB and PS, stripping to the state 82+, and acceleration in the SPS. There would be 144 bunches injected into the LHC per SPS cycle. However, the resulting luminosity would be rather low and several accumulating schemes are being considered as well. In this paper we are considering a next-generation EBIS device as a possible substitution for ion sources in the preinjector stages of the two colliders with the objective of achieving an improved performance.« less
Metallic ion production with the dione EBIS
We report the first quantitative results obtained with metallic elements injected from an Hollow Cathode ion source into the Dione EBIS. These results are concerned with the charge state distribution of gold ions, with a maximum for Au47+ of (1,3 × 107 ions), and the highest charge state detectable on a wire profiler of Au63+. The Au50+ ions have been captured in Mimas storage synchrotron, and an Fe20+ ion beam has been accelerated in the Saturne synchrotron. The Hollow Cathode ion source lifetime has been tested on a long term basis (Au1+ injected into Dione during six weeks, 24 hours per day). This source, able to produce metallic ions with any buffer gas (Ne, Ar, Kr, Xe, or N) and is also used to inject gaseous ions into Dione.