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PLT02 |
ERL-based Electron-Ion Collider eRHIC at BNL | |
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| In this paper, we describe our planned future electron-ion collider (EIC), based on the existing Relativistic Heavy Ion Collider (RHIC) hadron facility and the to-be-built electron-beam ERL with up-to six passes through its SRF linacs. Adding a polarized ERL-driven electron-beam with energy tunable within the 5-30 GeV range colliding with variety of species in the existing RHIC-accelerator complex, from polarized protons with a top energy of 250 GeV, to heavy fully striped ions with energies up to 100 GeV/u will turn it into most-advanced electron-ion collider with luminosity ~1034 cm-2ses−1. We also describe an FFAG-based option for eRHIC recirculating arcs. | ||
PLT04 |
ERL Requirements for X-ray Optics-Free FEL Oscillator | |
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| We present a comprehensive list of requirements for ERLs required for X-ray FEL oscillator. We discuss both the main ERL driving a high-gain FEL amplifier as well as ERL generating a feed-back electron beam. A scheme where a third ERL is used to generate a TEM-wiggler field used in the feed-back is also presented. | ||
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Slides PLT04 [2.058 MB] | |
WG202 |
Beam Dynamics and CSR Suppression in an ERL-driven X-ray FEL | |
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In this talk we present a self-consistent concept of ERL generated e-beam to drive an array of X-ray FELs. We use eRHIC multi-pass ERL design to explore all relevant beam dynamics. First, we study effects of incoherent and coherent synchrotron radiation on the e-beam parameters and present the set of parameters providing for the emittance preservation. Second, we present a sing bunch compressing scheme (similar to scheme described in *) with large compression ratio, which suppresses emittance growth caused by CSR. Finally, we present simulation result for soft- and hard-X-ray FELs driven by such electron beam. We compare projected performance of such facility with world's existing and proposed FEL facilities.
* Merger Designs for ERLs, V.N. Litvinenko, R.Hajima, D. Kayran, Nuclear Instruments and Methods in Physics Research A 557 (2006) 165 |
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Slides WG202 [0.972 MB] | |
WG204 |
Using Chromaticity to Suppress TBBU in High-Energy ERLs | |
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| Energy recovery linacs (ERLs) are an emerging generation of accelerators promising to revolutionize the fields of high-energy physics and photon sciences. These accelerators combine the advantages of linear accelerators with that of storage rings, and hold the promise of delivering electron beams of unprecedented power and quality. Use of superconducting radio-frequency (SRF) cavities converts ERLs into nearly perfect "perpetuum mobile" accelerators, wherein the beam is accelerated to a desirable energy, used, and then gives the energy back to the RF field. One potential weakness of these devices is transverse beam break-up instability that could severely limit the available beam current. In this paper, I propose a novel method of suppressing these dangerous effects using a natural phenomenon in the accelerators, viz., the chromaticity of the transverse motion. | ||
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Slides WG204 [0.655 MB] | |