| Paper | Title | Other Keywords | Page |
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| THPO004 | Pulsed Operation of CEBAF for JLEIC Injection | cavity, injection, electron, linac | 682 |
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Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. JLab Electron Ion Collider (JLEIC) is planning to use the recently upgraded 12 GeV CEBAF 1497 MHz SRF CW recirculating linac as a full-energy injector for the electron collider ring. The JLEIC electron injection requires 3-4µs long bunch trains with a 20-400ms spacing in between, resulting in uneven beam loading for the CW CEBAF. With the high beam current in JLEIC collider rings, the low duty factor of injection also requires to a very high pulsed beam current from CEBAF, exacerbating the transient beam loading issue. In this paper, we will present CEBAFs detailed pulsed operation scheme for JLEIC injection, as well as some experimental results at CEBAF. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO004 | ||
| About • | paper received ※ 20 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 | ||
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| THPO011 | First Energy Recovery Operation at the S-DALINAC: RF Control Stability Measurements | controls, operation, cavity, linac | 706 |
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Funding: *Supported by the DFG through GRK 2128. One of the main research instruments at the institute for nuclear physics at the TU Darmstadt is the recirculating superconducting linear accelerator S‑DALINAC. Many improvements were implemented since the first recirculated beam in 1991. One of the major enhancement is the upgrade from a twice to a thrice recirculating scheme in 2015/2016. With this upgrade the operation mode can be changed between a conventional accelerating operation and energy recovery linac (ERL) mode by an 180° rf phaseshift of the beam done via a path length variation of the arcs in the second recirculation. ERL operation was not possible when the rf control system for the superconducting structures was set up in 2010. Therefore the current rf control system is not optimized for this kind of operation and so it had to be tested during ERL operation in order to also demonstrate its capability of this operation mode. In August 2017 a first once recirculating ERL operation was achieved. During this operation measurements regarding the rf control stability and the demand of rf power were done. This contribution is discussing this measurements and possible improvements for future energy recovery beam times. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO011 | ||
| About • | paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 | ||
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| THPO127 | The Effect of Energy Fluctuation on the Multi-bunch Acceleration in E-driven ILC Positron Source | positron, acceleration, cavity, booster | 958 |
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| E-Driven method is a technical backup for positron source for ILC. In the positron source, the positron is generated and accelerated in a multi-bunch format with gaps in a macro-pulse. We employ AM (Amplitude Modulation) to suppress the transient beam-loading, but a small fluctuation is still expected, depending on the compensation accuracy. In this article, the positron yield which is ratio of numbers of positrons over electrons, is evaluated as a function of the compensation accuracy. With this result and the detail investigation of the beam loading compensation accuracy by AM, the positron yield of E-Driven Positron source for ILC is evaluated. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO127 | ||
| About • | paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019 | ||
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | ||