Paper | Title | Page |
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THO1AB03 |
BNL Electron Beam Ion Sources: Status and Challenges | |
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Funding: US Department of Energy and the National Aeronautic and Space Administration The Electron Beam Ion Source (EBIS) at the Brookhaven National Laboratory (BNL) is a main source of highly charged ions for both Relativistic Heavy Ion Collider (RHIC) and NASA Space Radiation Laboratory (NSRL). It has delivered a wide variety of ions since 2010 with good stability and reliability. The ongoing development of the electron gun with electrostatic compression has a goal to significantly increase the current density of the electron beam. Such electron beam would allow boosting the charge state of ions, which RHIC EBIS injects into RFQ and therefore to increase their final energy at Booster for NSRL applications. This development can also benefit ISOLDE experiment at CERN, where high charge state of the extracted ions is as important as a large acceptance of EBIS and high repetition rate. The current status of RHIC EBIS and the results of the new gun development are presented. |
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Slides THO1AB03 [3.358 MB] | ||
THO3LR03 |
The Physics and Use of Electron Lenses at BNL | |
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Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy To compensate for the beam-beam effects from the proton-proton interactions at the two interaction points in the Relativistic Heavy Ion Collider (RHIC), two electron lenses (e-lenses) have been installed and commissioned in 2014. In this report, the physics of electron lens is briefly introduced, followed by the electron lens hardware and electron beam commissioning results in 2014 RHIC run. Although in 2014, RHIC is operating with gold and 3He beams, and the luminosity is not limited by head on beam-beam interactions, we still aligned the electron beam with the hadron beam to get the first experience with the electron-hadron beam interaction. The demonstration of electron and gold beam overlap has been achieved via electron backscattered detector, as well as the demonstration of electron beam parameters that are sufficiently stable to have no negative impact on the gold beam life time. With the experience of using electron lens on hadron beam, head on beam-beam compensation can be commissioned in the following year with proton beams, with a lattice which phase advance has a multiple of 180 degrees between the beam-beam interaction and electron lens locations. |
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Slides THO3LR03 [4.736 MB] | ||