HB2023 - List of Keywords (septum)

Paper	Title	Other Keywords	Page
TUA1C1	Major Longitudinal Impedance Sources in the J-PARC Main Ring	impedance, cavity, operation, kicker	53
	A. Kobayashi KEK, Tokai, Ibaraki, Japan
	Beam intensity upgrade is ongoing at the J-PARC main ring. The beam instability is controlled by feedback systems in both longitudinal and transverse directions respectively. However, in recent years, microbunch structures have been observed during debunching, inducing electron cloud and transverse beam instability, which has become a problem. It is essential to identify the cause and take countermeasures. A summary of model and measurement comparisons will be reported for the major impedances RF-cavities, FX-septa, and FX-kickers. Of the five septa, two have been subjected to impedance reduction measures. The remaining three septa are of different types, but similar measures are planning.
	Slides TUA1C1 [26.758 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-TUA1C1
About •	Received ※ 29 September 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 18 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEA4C2	Beam Loss Simulations for the Proposed TATTOOS Beamline at HIPA	target, proton, simulation, cyclotron	300
	M. Hartmann, D.C. Kiselev, D. Reggiani, M. Seidel, J. Snuverink, H. Zhang PSI, Villigen PSI, Switzerland M. Seidel EPFL, Lausanne, Switzerland
	IMPACT (Isotope and Muon Production with Advanced Cyclotron and Target Technology) is a proposed upgrade project for the high-intensity proton accelerator facility (HIPA) at the Paul Scherrer Institute (PSI). As part of IMPACT, a new radioisotope target station, TATTOOS (Targeted Alpha Tumour Therapy and Other Oncological Solutions) will allow to produce promising radionuclides for diagnosis and therapy of cancer in doses sufficient for clinical studies. The proposed TATTOOS beamline and target will be located near the UCN (Ultra Cold Neutron source) target area, branching off from the main UCN beamline. In particular, the 590 MeV proton beamline is intended to operate at a beam intensity of 100 uA (60 kW), requiring a continuous splitting of the main beam via an electrostatic splitter. Beam loss simulations to verify safe operation have been performed and optimised using BDSIM, a Geant4 based tool enabling the simulation of beam transportation through magnets and particle passage through accelerator. In this study, beam profiles, beam transmission and power deposits are generated and studied. Finally, a quantitative description of the beam halo is introduced.
	Slides WEA4C2 [4.534 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-WEA4C2
About •	Received ※ 29 September 2023 — Revised ※ 04 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 28 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	extraction, proton, betatron, cathode	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

Other Keywords

Page

TUA1C1

Major Longitudinal Impedance Sources in the J-PARC Main Ring

impedance, cavity, operation, kicker

53

A. Kobayashi
KEK, Tokai, Ibaraki, Japan

Beam intensity upgrade is ongoing at the J-PARC main ring. The beam instability is controlled by feedback systems in both longitudinal and transverse directions respectively. However, in recent years, microbunch structures have been observed during debunching, inducing electron cloud and transverse beam instability, which has become a problem. It is essential to identify the cause and take countermeasures. A summary of model and measurement comparisons will be reported for the major impedances RF-cavities, FX-septa, and FX-kickers. Of the five septa, two have been subjected to impedance reduction measures. The remaining three septa are of different types, but similar measures are planning.

Slides TUA1C1 [26.758 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-TUA1C1

About •

Received ※ 29 September 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 18 October 2023

Cite •

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

WEA4C2

Beam Loss Simulations for the Proposed TATTOOS Beamline at HIPA

target, proton, simulation, cyclotron

300

M. Hartmann, D.C. Kiselev, D. Reggiani, M. Seidel, J. Snuverink, H. Zhang
PSI, Villigen PSI, Switzerland
M. Seidel
EPFL, Lausanne, Switzerland

IMPACT (Isotope and Muon Production with Advanced Cyclotron and Target Technology) is a proposed upgrade project for the high-intensity proton accelerator facility (HIPA) at the Paul Scherrer Institute (PSI). As part of IMPACT, a new radioisotope target station, TATTOOS (Targeted Alpha Tumour Therapy and Other Oncological Solutions) will allow to produce promising radionuclides for diagnosis and therapy of cancer in doses sufficient for clinical studies. The proposed TATTOOS beamline and target will be located near the UCN (Ultra Cold Neutron source) target area, branching off from the main UCN beamline. In particular, the 590 MeV proton beamline is intended to operate at a beam intensity of 100 uA (60 kW), requiring a continuous splitting of the main beam via an electrostatic splitter. Beam loss simulations to verify safe operation have been performed and optimised using BDSIM, a Geant4 based tool enabling the simulation of beam transportation through magnets and particle passage through accelerator. In this study, beam profiles, beam transmission and power deposits are generated and studied. Finally, a quantitative description of the beam halo is introduced.

Slides WEA4C2 [4.534 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-WEA4C2

About •

Received ※ 29 September 2023 — Revised ※ 04 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 28 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

extraction, proton, betatron, cathode

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)