Radiation Generation with an Existing Demonstrator of an Energy-Recovery Continuous-Wave Superconducting RF Accelerator
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Radiation Generation with an Existing Demonstrator of an Energy-Recovery Continuous-Wave Superconducting RF Accelerator Ji-Gwang Hwang,∗ Michael Abo-Bakr, Aleksandr Matveenko and Georgios Kourkafas Helmholtz-Zentrum Berlin (HZB), Albert-Einstein-Straβe 15, Berlin 12489, Germany
Thorsten Kamps† Helmholtz-Zentrum Berlin (HZB), Albert-Einstein-Straβe 15, Berlin 12489, Germany and Humboldt-Universit¨ at zu Berlin Institut f¨ ur Physik, Newton-Straβe 15, Berlin 12489, Germany (Received 8 January 2020; accepted 20 Febuary 2020) Over the past decades, many accelerator laboratories have put much effort into the development of compact energy-recovery linac (ERL) demonstrators to verify various physical and technical aspects of the generation, acceleration, transport and energy recovery of high brightness and high average current electron beams in a superconducting radio-frequency (SRF) linear accelerator. Beyond these goals, the ERL demonstrator also offers unique opportunities to study novel schemes for THz and X-ray radiation generation. In this paper, we discuss feasible options for schemes generating THz and X-ray radiation at low-energy continuous-wave (CW) SRF ERL demonstrators such as the bERLinPro accelerator. Keywords: THz source, Energy recovery linac demonstrator, bERLinPro DOI: 10.3938/jkps.77.337
I. INTRODUCTION During the past two decades, the design and construction of energy recovery linear accelerators (ERLs), such as cERL in Japan [1], bERLinPro [2], S-DALINAC [3], and MESA [4] in Germany, ALICE in UK [5], PERLE in France [6], CBETA [7], ER@CEBAF [8] and CeC@RHIC in USA [9], and NovoFEL in Russia [10], have been carried out all over the world to demonstrate key technologies for a GeV-scale energy-recovery linac (ERL)-based radiation source. Almost all of these accelerators utilize continuous-wave (CW) superconducting cavities to accelerate ultra-bright electron beams in 6-dimensional phase space at high repetition rates. This combination is substantial for obtaining high average and peak brightnesses as in lightsources based on storage rings, where the only task of accelerating cavities is to replenish losses arising from the emission of synchrotron radiation. Recently, the fundamental technology developments of a superconducting radio-frequency (SRF) high-power electron gun, high quantum efficiency photocathode and high-gradient accelerating cavities have been coming together gradually and the operational techniques for energy recovery have been proven with a beam current of 5–9 mA [11, 12]. Here, we want to discuss science cases and applications ∗ E-mail: † E-mail:
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pISSN:0374-4884/eISSN:1976-8524
beyond accelerator science research for bERLinPro [13], which is an ERL project and currently under construction at the Helmholtz-Zentrum Berlin (HZB) Institute in Germany. Various options have been discussed at the 63rd ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs 2019 (ERL’19) and at a satellite meeting [14]. One option was to use th
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