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| MO1PA02 | Beam Commissioning of Normal Conducting Part and Status of ESS Project | 18 |
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| The European Spallation Source, currently under construction in Lund Sweden, will be a spallation neutron source driven by a superconducting proton linac with a design power of 5 MW. The linac features a high peak current of 62.5 mA and long pulse length of 2.86 ms with a repetition rate of 14 Hz. The normal conducting part of the linac has been undergoing beam commissioning in multiple steps, and the main focus of the beam commissioning has been on bringing systems into operation, including auxiliary ones. In 2022, beam was transported to the end of the first tank of the five-tank drift tube linac. This paper provides a summary of the beam commissioning activities at ESS and the current status of the linac. | ||
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Slides MO1PA02 [18.907 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MO1PA02 | |
| About • | Received ※ 20 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 21 September 2022 | |
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| TUPOJO14 | Status of Testing and Commissioning of the Medium Energy Beam Transport Line of the ESS Normal Conducting Linac | 376 |
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| The latest beam commissioning phase of the Normal Conducting Linac at ESS delivered a proton beam through the Medium Energy Beam Transport (MEBT) into the first Drift Tube Linac (DTL) tank. The probe beam in MEBT consisted of 3.6 MeV protons of <6 mA, <5 microseconds pulse length and 1 Hz repetition rate. Following the delivery of the components at ESS in Lund in June 2019, the commissioning phase with the MEBT was completed in July 2022. In March 2022, the maximum beam current of 62.5 mA was transported up to the MEBT Faraday cup. This proceeding focuses on the status of MEBT including magnets, buncher cavities, scrapers and beam diagnostics designed and tested in collaboration with ESS Bilbao. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO14 | |
| About • | Received ※ 13 August 2022 — Revised ※ 19 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 01 September 2022 | |
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| TUPORI29 | Space Charge and Electron Confinement in High Current Low Energy Transport Lines: Experience and Simulations From IFMIF/EVEDA and ESS Commissioning | 618 |
| TUOPA08 | use link to see paper's listing under its alternate paper code | |
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| The mechanism of space charge compensation given by the residual gas ionization is a key factor for the emittance containment in the low energy beam transport (LEBT) lines of high intensity hadron injectors. A typical front end including a microwave Ion source, a LEBT and Radio Frequency Quadrupole (RFQ), is equipped with two repellers at each interface to prevent electrons from flowing back, to the source, or forward, to the RFQ. In this paper we will emphasize the importance of the ion Source and LEBT repellers on giving the appropriate boundary conditions for the space-charge compensation building-up mechanism. The theory and simulations are supported by experiments performed in the high intensity facility such as ESS and IFMIF/EVEDA. | ||
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Slides TUPORI29 [1.633 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPORI29 | |
| About • | Received ※ 23 August 2022 — Revised ※ 03 September 2022 — Accepted ※ 06 September 2022 — Issue date ※ 15 September 2022 | |
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| THPORI19 | HSMDIS Performance on the ESS Ion Source | 863 |
| THOPA10 | use link to see paper's listing under its alternate paper code | |
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The ESS ion source, developed at INFN-LNS and installed at the ESS facility, is fully working and in operation for the linac beam commissioning. The commissioning of the source was done in Catania and in Lund showing high reproducibility related to the beam diagnostic parameters that can be measured with the subset of equipment currently available in Lund. The analysis of the data collected during the commissioning in Catania discloses the possibility to use a new source configuration named High Stability Microwave Discharge Ion Source (HSMDIS), able to improve beam stability and lower the beam emittance. This paper shows the capability to increase the beam current intensity, with preserving beam stability, by changing only the microwave power. Linearity was tested from 10 to 120 mA to be able to provide the lower values needed for the different phases of the accelerator commissioning and higher values for future accelerator development. The source stability is evaluated through intra-pulse stability and pulse-to-pulse stability.
Reference: L. Neri, L. Celona "High stability microwave discharge ion sources" Sci Rep 12, 3064 (2022). https://doi.org/10.1038/s41598-022-06937-7 |
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Slides THPORI19 [37.408 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPORI19 | |
| About • | Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 16 September 2022 | |
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