HB2023 - Table of Session: FRC1I (Invited Presentations WG E)

Paper	Title	Page
FRC1I1	The Beam Destinations for the Commissioning of the ESS High Power Normal Conducting Linac	643
	E.M. Donegani, V. Grishin, E. Laface, C. Neto, A. Olsson, L. Page, T.J. Shea ESS, Lund, Sweden V.V. Bertrand PANTECHNIK, Bayeux, France I. Bustinduy ESS Bilbao, Zamudio, Spain M. Ruelas RadiaBeam, Santa Monica, California, USA
	At the European Spallation Source (ESS) in Lund (Sweden), the commissioning of the high-power normal conducting linac started in 2018. This paper deals with the beam destinations for the commissioning phases with initially the proton source and LEBT, then the MEBT and lately four DTL sections. The beam destinations were designed to withstand the ESS commissioning beam modes (with proton current up to 62.5mA, pulse length up to 50E-6s and repetition rates up to 14Hz). The EPICS-based control system allows measurements of the proton current and pulse length in real-time; it controls the motion and the power suppliers, and it also monitors the water cooling systems. Special focus will be on the results of thermo-mechanical simulations in MCNP/ANSYS to ensure safe absorption and dissipation of the volumetric power-deposition. The devices’ materials were chosen not only to cope with the high-power proton-beam, but also to be vacuum-compatible, to minimize the activation of the beam destinations themselves and the residual dose nearby. The results of neutronics simulations will be summarized with special focus on the shielding strategy, the operational limits and relocation procedures.
	Slides FRC1I1 [6.348 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-FRC1I1
About •	Received ※ 29 September 2023 — Revised ※ 07 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 13 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRC1I2	High Beam Current Operation with Beam Diagnostics at LIPAc	649
	S. Kwon, T. Akagi, A. De Franco, K. Hirosawa, K. Kondo, K. Masuda, M. Ohta QST Rokkasho, Aomori, Japan F. Bénédetti, Y. Carin, F. Cismondi, D. Gex IFMIF/EVEDA, Rokkasho, Japan B. Bolzon, N. Chauvin CEA-IRFU, Gif-sur-Yvette, France D. Jimenez-Rey, I. Podadera, A. Rodríguez Páramo, V. Villamayor CIEMAT, Madrid, Spain L. Maindive UGR, Granada, Spain J. Marroncle CEA-DRF-IRFU, France J.C. Morales Vega, I. Podadera Consorcio IFMIF-DONES España, Granada, Spain M. Poggi INFN/LNL, Legnaro (PD), Italy
	The Linear IFMIF Prototype Accelerator (LIPAc) is under commissioning in Rokkasho Fusion Institute in Japan and aims to accelerate 125 mA D⁺ at 9 MeV in CW mode for validating the IFMIF accelerator design. To insure a fine characterization and tuning of the machine many beam diagnostics are installed such as CTs, profile/position/loss/bunch length monitors spanning from Injector to the beam dump (BD). The beam operations in 1.0 ms pulsed D⁺ at 5 MeV was successfully completed with a low power BD (Phase B) in 2019. Despite the challenges posed by the pandemic, the crucial transition to a new linac configuration was also finalized to enable operation in 1.0 ms to CW D⁺ at 5 MeV with the high-power BD (Phase B+). Thanks to the efforts of the entire team, the 1st beam operation of Phase B+ was carried out in 2021. We present the experiences and challenges encountered during the beam operations, particularly the findings from the interceptive devices to measure the beam profile and emittance using tungsten wires rackets, SEMGrid. We also discuss the quick results on other beam diagnostics from the beam operation of Phase B+ toward HDC, which are currently conducting in this Summer.
	Slides FRC1I2 [9.323 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-FRC1I2
About •	Received ※ 02 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 23 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRC1I3	Devices for High-Efficiency Slow Extraction at J-PARC Main Ring	656
	R. Muto, T. Kimura, S. Murasugi, K. Numai, K. Okamura, Y. Shirakabe, M. Tomizawa, E. Yanaoka KEK, Ibaraki, Japan A. Matsumura Nihon Advanced Technology Co., Ltd, Ibaraki, Nakagun, Tokaimura, Japan
	J-PARC Main Ring (MR) is a synchrotron that accelerates protons up to 30 GeV and supplies them to the Neutrino Experimental Facility and the Hadron Experimental Facility (HEF). Beam extraction from MR to HEF is performed by slow extraction using third-order resonance. In the slow extraction a device called an electrostatic septum (ESS) is used to scrape out the beam, and it is important to reduce the beam loss at the septum electrode of the ESS in order to supply a high-intensity beam. So far, we have achieved a slow extraction efficiency of 99.5% by developing an ESS with a thin septum electrode and tuning the bump orbit to reduce the width of the angular distribution of protons at the ESS. In addition, a collimator is installed downstream of the ESS to absorb particles scattered by the septum electrode, thereby reducing activation of the components downstream. In order to achieve further reduction of the beam loss, we are currently considering to install beam diffusers and/or bent silicon crystals at the upstream of the ESS. In this talk, we will present the current status of the slow extraction devices and future plans to further improve the extraction efficiency.
	Slides FRC1I3 [3.167 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-FRC1I3
About •	Received ※ 18 October 2023 — Revised ※ 19 October 2023 — Accepted ※ 23 October 2023 — Issued ※ 01 November 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

The Beam Destinations for the Commissioning of the ESS High Power Normal Conducting Linac

643

E.M. Donegani, V. Grishin, E. Laface, C. Neto, A. Olsson, L. Page, T.J. Shea
ESS, Lund, Sweden
V.V. Bertrand
PANTECHNIK, Bayeux, France
I. Bustinduy
ESS Bilbao, Zamudio, Spain
M. Ruelas
RadiaBeam, Santa Monica, California, USA

At the European Spallation Source (ESS) in Lund (Sweden), the commissioning of the high-power normal conducting linac started in 2018. This paper deals with the beam destinations for the commissioning phases with initially the proton source and LEBT, then the MEBT and lately four DTL sections. The beam destinations were designed to withstand the ESS commissioning beam modes (with proton current up to 62.5mA, pulse length up to 50E-6s and repetition rates up to 14Hz). The EPICS-based control system allows measurements of the proton current and pulse length in real-time; it controls the motion and the power suppliers, and it also monitors the water cooling systems. Special focus will be on the results of thermo-mechanical simulations in MCNP/ANSYS to ensure safe absorption and dissipation of the volumetric power-deposition. The devices’ materials were chosen not only to cope with the high-power proton-beam, but also to be vacuum-compatible, to minimize the activation of the beam destinations themselves and the residual dose nearby. The results of neutronics simulations will be summarized with special focus on the shielding strategy, the operational limits and relocation procedures.

Slides FRC1I1 [6.348 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-FRC1I1

About •

Received ※ 29 September 2023 — Revised ※ 07 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 13 October 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRC1I2

High Beam Current Operation with Beam Diagnostics at LIPAc

649

S. Kwon, T. Akagi, A. De Franco, K. Hirosawa, K. Kondo, K. Masuda, M. Ohta
QST Rokkasho, Aomori, Japan
F. Bénédetti, Y. Carin, F. Cismondi, D. Gex
IFMIF/EVEDA, Rokkasho, Japan
B. Bolzon, N. Chauvin
CEA-IRFU, Gif-sur-Yvette, France
D. Jimenez-Rey, I. Podadera, A. Rodríguez Páramo, V. Villamayor
CIEMAT, Madrid, Spain
L. Maindive
UGR, Granada, Spain
J. Marroncle
CEA-DRF-IRFU, France
J.C. Morales Vega, I. Podadera
Consorcio IFMIF-DONES España, Granada, Spain
M. Poggi
INFN/LNL, Legnaro (PD), Italy

The Linear IFMIF Prototype Accelerator (LIPAc) is under commissioning in Rokkasho Fusion Institute in Japan and aims to accelerate 125 mA D⁺ at 9 MeV in CW mode for validating the IFMIF accelerator design. To insure a fine characterization and tuning of the machine many beam diagnostics are installed such as CTs, profile/position/loss/bunch length monitors spanning from Injector to the beam dump (BD). The beam operations in 1.0 ms pulsed D⁺ at 5 MeV was successfully completed with a low power BD (Phase B) in 2019. Despite the challenges posed by the pandemic, the crucial transition to a new linac configuration was also finalized to enable operation in 1.0 ms to CW D⁺ at 5 MeV with the high-power BD (Phase B+). Thanks to the efforts of the entire team, the 1st beam operation of Phase B+ was carried out in 2021. We present the experiences and challenges encountered during the beam operations, particularly the findings from the interceptive devices to measure the beam profile and emittance using tungsten wires rackets, SEMGrid. We also discuss the quick results on other beam diagnostics from the beam operation of Phase B+ toward HDC, which are currently conducting in this Summer.

Slides FRC1I2 [9.323 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-FRC1I2

About •

Received ※ 02 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 23 October 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRC1I3

Devices for High-Efficiency Slow Extraction at J-PARC Main Ring

656

R. Muto, T. Kimura, S. Murasugi, K. Numai, K. Okamura, Y. Shirakabe, M. Tomizawa, E. Yanaoka
KEK, Ibaraki, Japan
A. Matsumura
Nihon Advanced Technology Co., Ltd, Ibaraki, Nakagun, Tokaimura, Japan

J-PARC Main Ring (MR) is a synchrotron that accelerates protons up to 30 GeV and supplies them to the Neutrino Experimental Facility and the Hadron Experimental Facility (HEF). Beam extraction from MR to HEF is performed by slow extraction using third-order resonance. In the slow extraction a device called an electrostatic septum (ESS) is used to scrape out the beam, and it is important to reduce the beam loss at the septum electrode of the ESS in order to supply a high-intensity beam. So far, we have achieved a slow extraction efficiency of 99.5% by developing an ESS with a thin septum electrode and tuning the bump orbit to reduce the width of the angular distribution of protons at the ESS. In addition, a collimator is installed downstream of the ESS to absorb particles scattered by the septum electrode, thereby reducing activation of the components downstream. In order to achieve further reduction of the beam loss, we are currently considering to install beam diffusers and/or bent silicon crystals at the upstream of the ESS. In this talk, we will present the current status of the slow extraction devices and future plans to further improve the extraction efficiency.

Slides FRC1I3 [3.167 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-FRC1I3

About •

Received ※ 18 October 2023 — Revised ※ 19 October 2023 — Accepted ※ 23 October 2023 — Issued ※ 01 November 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)