HB2023 - List of Keywords (rfq)

Paper	Title	Other Keywords	Page
TUC1C2	The Impact of High-Dimensional Phase Space Correlations on the Beam Dynamics in a Linear Accelerator	linac, MEBT, simulation, LEBT	68
	A.M. Hoover, A.V. Aleksandrov, S.M. Cousineau, K.J. Ruisard, A.P. Shishlo, A.P. Zhukov ORNL, Oak Ridge, TN, USA
	Hadron beams develop intensity-dependent transverse-longitudinal correlations within radio-frequency quadrupole (RFQ) accelerating structures. These correlations are only visible in six-dimensional phase space and are destroyed by reconstructions from low-dimensional projections. In this work, we estimate the effect of artificial decorrelation on the beam dynamics in the Spallation Neutron Source (SNS) linac and Beam Test Facility (BTF). We show that the evolution of a realistic initial distribution and its decorrelated twin converge during the early acceleration stages; thus, low-dimensional projections are probably sufficient for detailed predictions in high-power linacs.
	Slides TUC1C2 [6.573 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC1C2
About •	Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 13 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUA3I2	Measurements of Momentum Halo Due to the Reduced RFQ Voltage During the LIPAc Beam Commissioning	MMI, operation, simulation, cryomodule	112
	K. Hirosawa, A. De Franco, K. Hasegawa, K. Kondo, S. Kwon, K. Masuda, A. Mizuno, M. Sugimoto QST Rokkasho, Aomori, Japan F. Bénédetti CEA-DRF-IRFU, France Y. Carin, H. Dzitko, D. Gex, I. Moya, F. Scantamburlo F4E, Germany J.C. Morales Vega Consorcio IFMIF-DONES España, Granada, Spain I. Podadera CIEMAT, Madrid, Spain
	The Linear IFMIF Prototype Accelerator, LIPAc, is being commissioned aiming in particular at validating the RFQ up to 5MeV beam acceleration. Eventually, the nominal beam of 5 MeV-125 mA in 1 ms/1 Hz pulsed mode was achieved in 2019. The beam operation has been resumed since July 2023 after long maintenance including recovery from unexpected problems in the RFQ RF system. This new phase aims at the commissioning of the full configuration except SRF linac, which is replaced by a temporary beam transport line. Focusing on the RFQ behavior, it will be interesting to operate it at higher duty especially for longer pulses. Indeed, a beam simulation study suggested that the beam extracted from the RFQ includes considerable momentum halo when the RFQ voltage reduces by a few percent, with a slight decrease of mean energy. It can be a potential source of quench like the mismatched beam in the cryomodule. This could be studied measuring the energy from the Time-of-Flight among multiple BPMs while monitoring beam loss around the dipole, where momentum halo should be lost. During the upcoming commissioning, we propose to study them by scanning the RFQ voltage.
	Slides TUA3I2 [4.465 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-TUA3I2
About •	Received ※ 29 September 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 29 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUA3I4	SARAF MEBT Commissioning	experiment, MEBT, linac, proton	123
	N. Pichoff, A. Chancé, J. Dumas, F. Gougnaud, F. Senée, D.U. Uriot CEA-IRFU, Gif-sur-Yvette, France A. Kreisel, J. Luner, A. Perry, E. Reinfeld, R. Weiss-Babai, L. Weissman Soreq NRC, Yavne, Israel
	SNRC in Israel is in the process of constructing a neutron production accelerator facility called SARAF. The facility will utilize a linac to accelerate a 5 mA CW deuteron and proton beam up to 40 MeV. In the first phase of the project, SNRC completed construction and operation of a linac (referred to as SARAF Phase I) which included an ECR ion source, a Low-Energy Beam Transport (LEBT) line, and a 4-rod RFQ. The second phase of the project involves collaboration between SNRC and Irfu in France to manufacture the linac. The injector control system has been updated and the Medium Energy Beam Transport (MEBT) line has been installed and integrated into the infrastructure. Recent testing and commissioning of the injector and MEBT with 5 mA CW protons and 5 mA pulsed Deuterons, completed in 2022 and 2023, will be presented and discussed. A special attention will be paid to the experimental data processing with the Bayesian inference of the parameters of a digital twin.
	Slides TUA3I4 [2.559 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-TUA3I4
About •	Received ※ 04 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 29 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEA4I2	Linac4 Source and Low Energy Experience and Challenges	emittance, linac, solenoid, simulation	290
	E. Sargsyan, G. Bellodi, F.D.L. Di Lorenzo, J. Etxebarria, J.-B. Lallement, A.M. Lombardi, M. O’Neil CERN, Meyrin, Switzerland
	At the end of Long Shutdown 2 (LS2), in 2020 Linac4 became the new injector of CERN’s proton accelerator complex. The previous version of the Linac4 H⁻ ion source (IS03), produced an operational pulsed peak beam current of 35 mA, resulting in 27 mA after the Radio-Frequency Quadrupole (RFQ). This limited transmission was mainly due to the extracted beam emittance exceeding the acceptance of the RFQ. A new geometry of the Linac4 source extraction electrodes has been developed with the aim of decreasing the extracted beam emittance and increasing the transmission through the RFQ. The new source (IS04) has been studied and thoroughly tested at the Linac4 source test stand. At the start of the 2023 run, the IS04 was installed as operational source in the Linac4 tunnel and is being successfully used for operation with 27 mA peak current after the RFQ. During high-intensity tests, the source, the linac, and the transfer-line to the Proton Synchrotron Booster (PSB) were also tested with a peak beam current of up to 50 mA from the source resulting in 35 mA at the PSB injection. This paper discusses the recent developments, tests, and future plans for the Linac4 H⁻ ion source.
	Slides WEA4I2 [2.217 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-WEA4I2
About •	Received ※ 27 September 2023 — Revised ※ 06 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 29 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THA2C2	Comparison of Longitudinal Emittance of Various RFQs	emittance, simulation, focusing, linac	368
	M. Comunian, L. Bellan, A. Pisent INFN/LNL, Legnaro (PD), Italy
	In various projects a large variety of RFQs has been developed, for different application, with different average current, frequency, and energy range. On this article a comparison, in a scaled way, will be done, using the build RFQs of IFMIF, ESS, SPES, ANTHEM, PIAVE. On particular the beam dynamics characteristics will be analyzed, like transmission, output longitudinal emittance and real performance versus simulation.
	Slides THA2C2 [6.261 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-THA2C2
About •	Received ※ 30 September 2023 — Revised ※ 07 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 16 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THBP01	ESS-Bilbao RFQ Power Coupler: Design, Simulations and Tests	vacuum, cavity, linac, multipactoring	433
	I. Bustinduy, A. Conde, D. Fernández-Cañoto, N. Garmendia, P.J. González, G. Harper, A. Kaftoosian, J. Martin, J.L. Muñoz ESS Bilbao, Zamudio, Spain A.P. Letchford STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	ESS-Bilbao RFQ power coupler is presented. The RFQ operates at 352.2 MHz and will accelerate the 32 mA proton beam extracted from the ion source up to 3.0MeV. The RFQ will complete the ESS-Bilbao injector, that can be used by the ARGITU neutron source or as a stand-alone facility. The machining of the RFQ is finished, and vacuum tests as well as low power RF measurements have been carried out. The presented power coupler is a first iteration of the device, designed to be of easier and faster manufacturing than what might be needed for future upgrades of the linac. The coupler does not have active cooling and no brazing has been needed to assemble it. It can operate at the RF power required by the RFQ but at lower duty cycles. The dielectric window is made of polymeric material, so it can withhold the assembly using vacuum seals and bolts. Design and manufacturing issues are reported in the paper, as well as the RF tests that have been carried out at medium power. Multipacting calculations compared to measured values during conditioning are also reported. High power tests of the coupler have also been performed in the ISIS-FETS RFQ and are also described here.
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP01
About •	Received ※ 29 September 2023 — Revised ※ 08 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 28 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THBP03	ESS-Bilbao RFQ Static Tuning Algorithm and Simulation	cavity, simulation, operation, neutron	440
	J.L. Muñoz, I. Bustinduy, A. Conde, N. Garmendia, P.J. González, J. Martin, V. Toyos ESS Bilbao, Zamudio, Spain
	The ESS-Bilbao RFQ operates at 352.2 MHz. The machining of the four RFQ segments has finished and the assembly and tuning operations will follow shorly. The static tuning and field flatness are provided by an array of 60 plunger tuners, distributed along the 3.2 meters length of the structure. There are four tuners per segment per quadrant, except for one of the segments where the ports are used by the power couplers. A bead-pull setup will provide the measurements of the field profiles, that will be collected in a matrix built up with the contributions of individual tuners. The conventional approach of inverting the matrix to get the optimum tuners distribution is explored, as well as additional optimization method. Particularly, a genetic optimization algorithm provides a very succesful tuning of the RFQ. The solution provided by this approach will be used as the initial configuration of the tuners before the bead-pull measurements are carried out. Additionally, static and dynamic tuning of the RFQ is studied by high performance computing simulations of the RFQ. The analysis of the in-house computational electromagnetics suite used for these tasks is also discussed in this paper.
	Poster THBP03 [2.285 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP03
About •	Received ※ 29 September 2023 — Revised ※ 08 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 28 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THBP06	RFQ Upgrades for IFMIF-DONES	simulation, emittance, neutron, toolkit	451
	M. Comunian, L. Bellan, A. Palmieri, A. Pisent INFN/LNL, Legnaro (PD), Italy
	In the framework of IFMIF-DONES (International Fusion Materials Irradiation Facility- DEMO-Oriented Neutron Early Source) ¿ a powerful neutron irradiation facility for studies and certification of materials to be used in fusion reactors is planned as part of the European roadmap to fusion electricity. A possible RFQ upgrade has been designed. In this article the beam dynamics of an RFQ able to handle CW 200 mA of Deuterium, based on experience of IFMIF RFQ, will be presented.
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP06
About •	Received ※ 24 September 2023 — Revised ※ 07 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 15 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THBP08	Simulation Studies on the Low Energy Beam Transfer (LEBT) System of the ISIS Neutron Spallation Source	ion-source, LEBT, solenoid, space-charge	454
	S.A. Ahmadiannamin, D.C. Faircloth, S.R. Lawrie, A.P. Letchford, T.M. Sarmento, O.A. Tarvainen STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The transmission efficiency and beam dynamic parameters of the low-energy beam transfer (LEBT) section of proton accelerators, serving as a neutron spallation source, have a critical impact on beam loss in subsequent sections of the linear accelerator. Due to variations and mismatches, the beam parameters at the entrance of the radio-frequency quadrupole (RFQ) change, significantly affecting the transmission efficiency of the RFQ and the matching between RFQ and drift tube linac (DTL) structures. Recognizing the importance of this concept, particle-in-cell studies were conducted to optimize the LEBT section of the ISIS accelerator. This study presents the results of simulations.
	Poster THBP08 [1.081 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP08
About •	Received ※ 01 October 2023 — Revised ※ 05 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 30 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRA1I1	Status of the IOTA Proton Injector	proton, electron, MEBT, LEBT	629
	D.R. Edstrom, D.R. Broemmelsiek, K. Carlson, J.-P. Carneiro, H. Piekarz, A.L. Romanov, A.V. Shemyakin, A. Valishev Fermilab, Batavia, Illinois, USA
	Funding: This work has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. The IOTA Proton Injector (IPI), currently under installation at the Fermilab Accelerator Science and Technology facility, is a beamline capable of delivering 20-mA pulses of protons at 2.5 MeV to the Integrable Optics Test Accelerator (IOTA) ring. First beam in the IPI beamline is anticipated in 2023, when it will operate alongside the existing electron injector beamline to facilitate further fundamental physics research and continued development of novel accelerator technologies in the IOTA ring. This report details the expected operational profile, known challenges, and the current state of installation.
	Slides FRA1I1 [6.466 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-FRA1I1
About •	Received ※ 08 October 2023 — Revised ※ 09 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 11 October 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRA2I2	Summary of the Working Group B	linac, space-charge, operation, simulation	666
	N.J. Evans ORNL RAD, Oak Ridge, Tennessee, USA F. Bouly LPSC, Grenoble Cedex, France H.W. Zhao IMP/CAS, Lanzhou, People’s Republic of China
	Summary of the Working Group on Beam Dynamics in Linacs.
	Slides FRA2I2 [1.306 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-HB2023-FRA2I2
About •	Received ※ 23 November 2023 — Accepted ※ 29 November 2023 — Issued ※ 24 January 2024
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

TUC1C2

The Impact of High-Dimensional Phase Space Correlations on the Beam Dynamics in a Linear Accelerator

linac, MEBT, simulation, LEBT

68

A.M. Hoover, A.V. Aleksandrov, S.M. Cousineau, K.J. Ruisard, A.P. Shishlo, A.P. Zhukov
ORNL, Oak Ridge, TN, USA

Hadron beams develop intensity-dependent transverse-longitudinal correlations within radio-frequency quadrupole (RFQ) accelerating structures. These correlations are only visible in six-dimensional phase space and are destroyed by reconstructions from low-dimensional projections. In this work, we estimate the effect of artificial decorrelation on the beam dynamics in the Spallation Neutron Source (SNS) linac and Beam Test Facility (BTF). We show that the evolution of a realistic initial distribution and its decorrelated twin converge during the early acceleration stages; thus, low-dimensional projections are probably sufficient for detailed predictions in high-power linacs.

Slides TUC1C2 [6.573 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-TUC1C2

About •

Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 13 October 2023

Cite •

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

TUA3I2

Measurements of Momentum Halo Due to the Reduced RFQ Voltage During the LIPAc Beam Commissioning

MMI, operation, simulation, cryomodule

112

K. Hirosawa, A. De Franco, K. Hasegawa, K. Kondo, S. Kwon, K. Masuda, A. Mizuno, M. Sugimoto
QST Rokkasho, Aomori, Japan
F. Bénédetti
CEA-DRF-IRFU, France
Y. Carin, H. Dzitko, D. Gex, I. Moya, F. Scantamburlo
F4E, Germany
J.C. Morales Vega
Consorcio IFMIF-DONES España, Granada, Spain
I. Podadera
CIEMAT, Madrid, Spain

The Linear IFMIF Prototype Accelerator, LIPAc, is being commissioned aiming in particular at validating the RFQ up to 5MeV beam acceleration. Eventually, the nominal beam of 5 MeV-125 mA in 1 ms/1 Hz pulsed mode was achieved in 2019. The beam operation has been resumed since July 2023 after long maintenance including recovery from unexpected problems in the RFQ RF system. This new phase aims at the commissioning of the full configuration except SRF linac, which is replaced by a temporary beam transport line. Focusing on the RFQ behavior, it will be interesting to operate it at higher duty especially for longer pulses. Indeed, a beam simulation study suggested that the beam extracted from the RFQ includes considerable momentum halo when the RFQ voltage reduces by a few percent, with a slight decrease of mean energy. It can be a potential source of quench like the mismatched beam in the cryomodule. This could be studied measuring the energy from the Time-of-Flight among multiple BPMs while monitoring beam loss around the dipole, where momentum halo should be lost. During the upcoming commissioning, we propose to study them by scanning the RFQ voltage.

Slides TUA3I2 [4.465 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-TUA3I2

About •

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

Cite •

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

TUA3I4

SARAF MEBT Commissioning

experiment, MEBT, linac, proton

123

N. Pichoff, A. Chancé, J. Dumas, F. Gougnaud, F. Senée, D.U. Uriot
CEA-IRFU, Gif-sur-Yvette, France
A. Kreisel, J. Luner, A. Perry, E. Reinfeld, R. Weiss-Babai, L. Weissman
Soreq NRC, Yavne, Israel

SNRC in Israel is in the process of constructing a neutron production accelerator facility called SARAF. The facility will utilize a linac to accelerate a 5 mA CW deuteron and proton beam up to 40 MeV. In the first phase of the project, SNRC completed construction and operation of a linac (referred to as SARAF Phase I) which included an ECR ion source, a Low-Energy Beam Transport (LEBT) line, and a 4-rod RFQ. The second phase of the project involves collaboration between SNRC and Irfu in France to manufacture the linac. The injector control system has been updated and the Medium Energy Beam Transport (MEBT) line has been installed and integrated into the infrastructure. Recent testing and commissioning of the injector and MEBT with 5 mA CW protons and 5 mA pulsed Deuterons, completed in 2022 and 2023, will be presented and discussed. A special attention will be paid to the experimental data processing with the Bayesian inference of the parameters of a digital twin.

Slides TUA3I4 [2.559 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-TUA3I4

About •

Received ※ 04 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 29 October 2023

Cite •

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

WEA4I2

Linac4 Source and Low Energy Experience and Challenges

emittance, linac, solenoid, simulation

290

E. Sargsyan, G. Bellodi, F.D.L. Di Lorenzo, J. Etxebarria, J.-B. Lallement, A.M. Lombardi, M. O’Neil
CERN, Meyrin, Switzerland

At the end of Long Shutdown 2 (LS2), in 2020 Linac4 became the new injector of CERN’s proton accelerator complex. The previous version of the Linac4 H⁻ ion source (IS03), produced an operational pulsed peak beam current of 35 mA, resulting in 27 mA after the Radio-Frequency Quadrupole (RFQ). This limited transmission was mainly due to the extracted beam emittance exceeding the acceptance of the RFQ. A new geometry of the Linac4 source extraction electrodes has been developed with the aim of decreasing the extracted beam emittance and increasing the transmission through the RFQ. The new source (IS04) has been studied and thoroughly tested at the Linac4 source test stand. At the start of the 2023 run, the IS04 was installed as operational source in the Linac4 tunnel and is being successfully used for operation with 27 mA peak current after the RFQ. During high-intensity tests, the source, the linac, and the transfer-line to the Proton Synchrotron Booster (PSB) were also tested with a peak beam current of up to 50 mA from the source resulting in 35 mA at the PSB injection. This paper discusses the recent developments, tests, and future plans for the Linac4 H⁻ ion source.

Slides WEA4I2 [2.217 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-WEA4I2

About •

Received ※ 27 September 2023 — Revised ※ 06 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 29 October 2023

Cite •

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

THA2C2

Comparison of Longitudinal Emittance of Various RFQs

emittance, simulation, focusing, linac

368

M. Comunian, L. Bellan, A. Pisent
INFN/LNL, Legnaro (PD), Italy

In various projects a large variety of RFQs has been developed, for different application, with different average current, frequency, and energy range. On this article a comparison, in a scaled way, will be done, using the build RFQs of IFMIF, ESS, SPES, ANTHEM, PIAVE. On particular the beam dynamics characteristics will be analyzed, like transmission, output longitudinal emittance and real performance versus simulation.

Slides THA2C2 [6.261 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-THA2C2

About •

Received ※ 30 September 2023 — Revised ※ 07 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 16 October 2023

Cite •

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

THBP01

ESS-Bilbao RFQ Power Coupler: Design, Simulations and Tests

vacuum, cavity, linac, multipactoring

433

I. Bustinduy, A. Conde, D. Fernández-Cañoto, N. Garmendia, P.J. González, G. Harper, A. Kaftoosian, J. Martin, J.L. Muñoz
ESS Bilbao, Zamudio, Spain
A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

ESS-Bilbao RFQ power coupler is presented. The RFQ operates at 352.2 MHz and will accelerate the 32 mA proton beam extracted from the ion source up to 3.0MeV. The RFQ will complete the ESS-Bilbao injector, that can be used by the ARGITU neutron source or as a stand-alone facility. The machining of the RFQ is finished, and vacuum tests as well as low power RF measurements have been carried out. The presented power coupler is a first iteration of the device, designed to be of easier and faster manufacturing than what might be needed for future upgrades of the linac. The coupler does not have active cooling and no brazing has been needed to assemble it. It can operate at the RF power required by the RFQ but at lower duty cycles. The dielectric window is made of polymeric material, so it can withhold the assembly using vacuum seals and bolts. Design and manufacturing issues are reported in the paper, as well as the RF tests that have been carried out at medium power. Multipacting calculations compared to measured values during conditioning are also reported. High power tests of the coupler have also been performed in the ISIS-FETS RFQ and are also described here.

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP01

About •

Received ※ 29 September 2023 — Revised ※ 08 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 28 October 2023

Cite •

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

THBP03

ESS-Bilbao RFQ Static Tuning Algorithm and Simulation

cavity, simulation, operation, neutron

440

J.L. Muñoz, I. Bustinduy, A. Conde, N. Garmendia, P.J. González, J. Martin, V. Toyos
ESS Bilbao, Zamudio, Spain

The ESS-Bilbao RFQ operates at 352.2 MHz. The machining of the four RFQ segments has finished and the assembly and tuning operations will follow shorly. The static tuning and field flatness are provided by an array of 60 plunger tuners, distributed along the 3.2 meters length of the structure. There are four tuners per segment per quadrant, except for one of the segments where the ports are used by the power couplers. A bead-pull setup will provide the measurements of the field profiles, that will be collected in a matrix built up with the contributions of individual tuners. The conventional approach of inverting the matrix to get the optimum tuners distribution is explored, as well as additional optimization method. Particularly, a genetic optimization algorithm provides a very succesful tuning of the RFQ. The solution provided by this approach will be used as the initial configuration of the tuners before the bead-pull measurements are carried out. Additionally, static and dynamic tuning of the RFQ is studied by high performance computing simulations of the RFQ. The analysis of the in-house computational electromagnetics suite used for these tasks is also discussed in this paper.

Poster THBP03 [2.285 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP03

About •

Received ※ 29 September 2023 — Revised ※ 08 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 28 October 2023

Cite •

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

THBP06

RFQ Upgrades for IFMIF-DONES

simulation, emittance, neutron, toolkit

451

M. Comunian, L. Bellan, A. Palmieri, A. Pisent
INFN/LNL, Legnaro (PD), Italy

In the framework of IFMIF-DONES (International Fusion Materials Irradiation Facility- DEMO-Oriented Neutron Early Source) ¿ a powerful neutron irradiation facility for studies and certification of materials to be used in fusion reactors is planned as part of the European roadmap to fusion electricity. A possible RFQ upgrade has been designed. In this article the beam dynamics of an RFQ able to handle CW 200 mA of Deuterium, based on experience of IFMIF RFQ, will be presented.

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP06

About •

Received ※ 24 September 2023 — Revised ※ 07 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 15 October 2023

Cite •

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

THBP08

Simulation Studies on the Low Energy Beam Transfer (LEBT) System of the ISIS Neutron Spallation Source

ion-source, LEBT, solenoid, space-charge

454

S.A. Ahmadiannamin, D.C. Faircloth, S.R. Lawrie, A.P. Letchford, T.M. Sarmento, O.A. Tarvainen
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The transmission efficiency and beam dynamic parameters of the low-energy beam transfer (LEBT) section of proton accelerators, serving as a neutron spallation source, have a critical impact on beam loss in subsequent sections of the linear accelerator. Due to variations and mismatches, the beam parameters at the entrance of the radio-frequency quadrupole (RFQ) change, significantly affecting the transmission efficiency of the RFQ and the matching between RFQ and drift tube linac (DTL) structures. Recognizing the importance of this concept, particle-in-cell studies were conducted to optimize the LEBT section of the ISIS accelerator. This study presents the results of simulations.

Poster THBP08 [1.081 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP08

About •

Received ※ 01 October 2023 — Revised ※ 05 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 30 October 2023

Cite •

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

FRA1I1

Status of the IOTA Proton Injector

proton, electron, MEBT, LEBT

629

D.R. Edstrom, D.R. Broemmelsiek, K. Carlson, J.-P. Carneiro, H. Piekarz, A.L. Romanov, A.V. Shemyakin, A. Valishev
Fermilab, Batavia, Illinois, USA

Funding: This work has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
The IOTA Proton Injector (IPI), currently under installation at the Fermilab Accelerator Science and Technology facility, is a beamline capable of delivering 20-mA pulses of protons at 2.5 MeV to the Integrable Optics Test Accelerator (IOTA) ring. First beam in the IPI beamline is anticipated in 2023, when it will operate alongside the existing electron injector beamline to facilitate further fundamental physics research and continued development of novel accelerator technologies in the IOTA ring. This report details the expected operational profile, known challenges, and the current state of installation.

Slides FRA1I1 [6.466 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-FRA1I1

About •

Received ※ 08 October 2023 — Revised ※ 09 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 11 October 2023

Cite •

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

FRA2I2

Summary of the Working Group B

linac, space-charge, operation, simulation

666

N.J. Evans
ORNL RAD, Oak Ridge, Tennessee, USA
F. Bouly
LPSC, Grenoble Cedex, France
H.W. Zhao
IMP/CAS, Lanzhou, People’s Republic of China

Summary of the Working Group on Beam Dynamics in Linacs.

Slides FRA2I2 [1.306 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-HB2023-FRA2I2

About •

Received ※ 23 November 2023 — Accepted ※ 29 November 2023 — Issued ※ 24 January 2024

Cite •

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