LINAC2022 - List of Authors (Akintola, A.E.T.)

Paper	Title	Page
MOPOGE25	Rf Measurement and Characterisation of European Spallation Source Cavities at UKRI-STFC Daresbury Laboratory and DESY	212
	P.A. Smith, A.E.T. Akintola, K.D. Dumbell, M.J. Ellis, S. Hitchen, P.C. Hornickel, C.R. Jenkins, A.J. May, P.A. McIntosh, K.J. Middleman, A.J. Moss, S.M. Pattalwar, M.D. Pendleton, J.O.W. Poynton, A.E. Wheelhouse, S. Wilde STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom G. Jones, M. Lowe, D.A. Mason, G. Miller, J. Mutch, A. Oates, J.T.G. Wilson STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom K.J. Middleman Cockcroft Institute, Warrington, Cheshire, United Kingdom D. Reschke, L. Steder, M. Wiencek DESY, Hamburg, Germany
	The Accelerator Science and Technology Centre (ASTeC) is responsible for delivering 88 High Beta (HB) cavities as part of the European Spallation Source (ESS) facility in Sweden. The bulk Niobium Superconducting Radio Frequency (SRF) cavities operate at 704 MHz. They have been fabricated in industry and are currently being tested at Daresbury Laboratory and Deutsches Elektronen-Synchrotron (DESY). They will then be delivered to Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA) Saclay, France for integration into cryomodules. To date 50 cavities have been conditioned and evaluated and 36 cavities have been delivered to CEA. This paper discusses the experiences and testing of the cavities performed to date at both sites
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE25
About •	Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 04 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOJO15	Commissioning of UKRI-STFC SRF Vertical Test and HPR Reprocessing Facility	380
	M.D. Pendleton, A.E.T. Akintola, R.K. Buckley, G. Collier, K.D. Dumbell, M.J. Ellis, S. Hitchen, P.C. Hornickel, G. Hughes, C.R. Jenkins, A.J. May, P.A. McIntosh, K.J. Middleman, A.J. Moss, S.M. Pattalwar, J.O.W. Poynton, P.A. Smith, A.E. Wheelhouse, S. Wilde STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom G. Jones, M. Lowe, D.A. Mason, G. Miller, C. Mills, J. Mutch, A. Oates, J.T.G. Wilson STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
	Mark Pendleton, et al. The UK’s first and only vertical test facility and associated cleanroom reprocessing suite has been developed, commissioned, and entered steady-state operations at the UKRI-STFC Daresbury Laboratory. The facility is capable of 2 K testing of 3 jacketed SRF cavities in a horizontal configuration per 2-week test cycle. We report on the associated cryogenic, RF, UHV, mechanical, cleanroom, and HPR infrastructure. SRF cavity workflows have been developed to meet the requirements of the ESS high beta cavity project within a newly developed quality management system, SuraBee, in accordance with ISO9001. To support standardisation of measurements across the collaboration, reference cavities have been measured for cross-reference between CEA, DESY, and UKRI-STFC. We further report on commissioning objectives, observations, and continuous improvement activities.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO15
About •	Received ※ 24 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 05 September 2022 — Issue date ※ 08 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOGE07	Magnetic Field Measurements and Shielding at the UKRI-STFC Daresbury Laboratory SRF Vertical Test Facility	495
	A.E.T. Akintola, A.R. Bainbridge, S. Hitchen, A.J. May, S.M. Pattalwar, P.A. Smith STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom M. Lowe, D.A. Mason, A.D. Shabalina STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
	A novel vertical test facility has been developed, commissioned, and entered steady-state operations at the UKRI-STFC Daresbury Laboratory. The cryostat is designed to test 3 jacketed superconducting RF cavities in a horizontal configuration in a single cool-down run at 2 K. A 2-year program is currently underway to test ESS high-beta cavities. Upon completion of this program, the facility will undertake a testing program for PIP-II HB650 cavities. In the current configuration, a solution combining passive and active magnetic shielding has been validated for the ESS requirement of field attenuation to the level of <1 uT, although continuous field measurements are not provided. This paper reports the implementation of passive and active shielding, along with simulation and experimental measurements thereof.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE07
About •	Received ※ 22 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 01 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOGE09	Steady-State Cryogenic Operations for the UKRI-STFC Daresbury SRF Vertical Test Facility	501
	A.J. May, A.E.T. Akintola, R.K. Buckley, G. Collier, K.D. Dumbell, S. Hitchen, P.C. Hornickel, G. Hughes, C.R. Jenkins, S.M. Pattalwar, M.D. Pendleton, P.A. Smith STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	A novel vertical test facility has been developed, commissioned, and entered steady-state operations at the UKRI-STFC Daresbury Laboratory. The cryostat is designed to test 3 jacketed superconducting RF cavities in a horizontal configuration in a single cool-down run at 2 K. The cavities are cooled with superfluid helium filled into their individual helium jackets. This reduces the liquid helium consumption by more than 70% in comparison with the conventional facilities operational elsewhere. The facility is currently undertaking a 2-year program to qualify 84 high-beta SRF cavities for the ESS (European Spallation Source) as part of the UK’s in-kind contribution. This paper reports on the steady-state operations, along with a detailed discussion of the cryogenic performance of the facility, including that of the cryoplant.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE09
About •	Received ※ 13 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 04 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPOGE10	A Final Acceptance Test Kit for Superconducting RF Cryomodules	504
	A.J. May, A.E.T. Akintola, S.M. Pattalwar, A. White STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	UKRI-STFC Daresbury Laboratory is currently undertaking several projects involving assembly of superconducting RF cryomodules, including HL-LHC crab cavities and PIP-II HB650 cavities. As part of the final acceptance tests before shipping of the modules, extensive leak testing, pressure testing, and thermal cycling with gaseous and liquid must be performed. A Final Acceptance Test kit (FAT-kit) has been developed to support these tests. The FAT-kit, designed as a single portable unit, sits as an interface module between the cryomodule under test and the required utilities (liquid cryogen supply and return, gaseous cryogen supply and return, warm gas supply and return, vacuum pumps, leak detectors, etc.). The kit features a valve manifold to make or break connections to, from, and between circuits in the cryomodule, safety groupings to provide protection for the circuits as required, and various instrumentation. We report here on the design and commissioning of the kit.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE10
About •	Received ※ 23 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 15 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPOGE05	Some Interesting Observations During Vertical Test on ESS-HB-704 SRF Cavities	812
	K.D. Dumbell, A.E.T. Akintola, R.K. Buckley, M.J. Ellis, S. Hitchen, P.C. Hornickel, C.R. Jenkins, J. Lewis, A.J. May, P.A. McIntosh, K.J. Middleman, A.J. Moss, S.M. Pattalwar, M.D. Pendleton, P.A. Smith, A.E. Wheelhouse, S. Wilde STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom M.D. Hancock, J. Hathaway, C. Hodgkinson, G. Jones, M. Lowe, D.A. Mason, G. Miller, J. Mutch, A. Oates, J.T.G. Wilson STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
	The vertical test stand in use at Daresbury has three cavities loaded horizontally at different heights. The jacketed cavities are supplied with liquid helium from a header tank at the top of the configuration. A few cavities have been tested in different positions and the results have been analysed. The pressure of the helium inside the jacketed cavities is affected by the height of the liquid helium column above the jacket and using results from earlier analysis during cool-down enables the pressure of the cavity to be determined from the frequency of operation. Analysis of the effects may allow for corrections to the frequency to be made. In addition to the above observations there have also been some challenges in the operation at higher power as the phase of the self-excited loop driving the system, has been seen to change. This paper discusses some of the observation, analysis of those observations and challenges that are being addressed in the continuing use of this facility.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOGE05
About •	Received ※ 10 August 2022 — Revised ※ 13 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 15 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Rf Measurement and Characterisation of European Spallation Source Cavities at UKRI-STFC Daresbury Laboratory and DESY

212

P.A. Smith, A.E.T. Akintola, K.D. Dumbell, M.J. Ellis, S. Hitchen, P.C. Hornickel, C.R. Jenkins, A.J. May, P.A. McIntosh, K.J. Middleman, A.J. Moss, S.M. Pattalwar, M.D. Pendleton, J.O.W. Poynton, A.E. Wheelhouse, S. Wilde
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
G. Jones, M. Lowe, D.A. Mason, G. Miller, J. Mutch, A. Oates, J.T.G. Wilson
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
K.J. Middleman
Cockcroft Institute, Warrington, Cheshire, United Kingdom
D. Reschke, L. Steder, M. Wiencek
DESY, Hamburg, Germany

The Accelerator Science and Technology Centre (ASTeC) is responsible for delivering 88 High Beta (HB) cavities as part of the European Spallation Source (ESS) facility in Sweden. The bulk Niobium Superconducting Radio Frequency (SRF) cavities operate at 704 MHz. They have been fabricated in industry and are currently being tested at Daresbury Laboratory and Deutsches Elektronen-Synchrotron (DESY). They will then be delivered to Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA) Saclay, France for integration into cryomodules. To date 50 cavities have been conditioned and evaluated and 36 cavities have been delivered to CEA. This paper discusses the experiences and testing of the cavities performed to date at both sites

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE25

About •

Received ※ 24 August 2022 — Revised ※ 29 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 04 September 2022

Cite •

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

TUPOJO15

Commissioning of UKRI-STFC SRF Vertical Test and HPR Reprocessing Facility

380

M.D. Pendleton, A.E.T. Akintola, R.K. Buckley, G. Collier, K.D. Dumbell, M.J. Ellis, S. Hitchen, P.C. Hornickel, G. Hughes, C.R. Jenkins, A.J. May, P.A. McIntosh, K.J. Middleman, A.J. Moss, S.M. Pattalwar, J.O.W. Poynton, P.A. Smith, A.E. Wheelhouse, S. Wilde
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
G. Jones, M. Lowe, D.A. Mason, G. Miller, C. Mills, J. Mutch, A. Oates, J.T.G. Wilson
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom

Mark Pendleton, et al. The UK’s first and only vertical test facility and associated cleanroom reprocessing suite has been developed, commissioned, and entered steady-state operations at the UKRI-STFC Daresbury Laboratory. The facility is capable of 2 K testing of 3 jacketed SRF cavities in a horizontal configuration per 2-week test cycle. We report on the associated cryogenic, RF, UHV, mechanical, cleanroom, and HPR infrastructure. SRF cavity workflows have been developed to meet the requirements of the ESS high beta cavity project within a newly developed quality management system, SuraBee, in accordance with ISO9001. To support standardisation of measurements across the collaboration, reference cavities have been measured for cross-reference between CEA, DESY, and UKRI-STFC. We further report on commissioning objectives, observations, and continuous improvement activities.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOJO15

About •

Received ※ 24 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 05 September 2022 — Issue date ※ 08 September 2022

Cite •

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

TUPOGE07

Magnetic Field Measurements and Shielding at the UKRI-STFC Daresbury Laboratory SRF Vertical Test Facility

495

A.E.T. Akintola, A.R. Bainbridge, S. Hitchen, A.J. May, S.M. Pattalwar, P.A. Smith
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
M. Lowe, D.A. Mason, A.D. Shabalina
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom

A novel vertical test facility has been developed, commissioned, and entered steady-state operations at the UKRI-STFC Daresbury Laboratory. The cryostat is designed to test 3 jacketed superconducting RF cavities in a horizontal configuration in a single cool-down run at 2 K. A 2-year program is currently underway to test ESS high-beta cavities. Upon completion of this program, the facility will undertake a testing program for PIP-II HB650 cavities. In the current configuration, a solution combining passive and active magnetic shielding has been validated for the ESS requirement of field attenuation to the level of <1 uT, although continuous field measurements are not provided. This paper reports the implementation of passive and active shielding, along with simulation and experimental measurements thereof.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE07

About •

Received ※ 22 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 01 September 2022

Cite •

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

TUPOGE09

Steady-State Cryogenic Operations for the UKRI-STFC Daresbury SRF Vertical Test Facility

501

A.J. May, A.E.T. Akintola, R.K. Buckley, G. Collier, K.D. Dumbell, S. Hitchen, P.C. Hornickel, G. Hughes, C.R. Jenkins, S.M. Pattalwar, M.D. Pendleton, P.A. Smith
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

A novel vertical test facility has been developed, commissioned, and entered steady-state operations at the UKRI-STFC Daresbury Laboratory. The cryostat is designed to test 3 jacketed superconducting RF cavities in a horizontal configuration in a single cool-down run at 2 K. The cavities are cooled with superfluid helium filled into their individual helium jackets. This reduces the liquid helium consumption by more than 70% in comparison with the conventional facilities operational elsewhere. The facility is currently undertaking a 2-year program to qualify 84 high-beta SRF cavities for the ESS (European Spallation Source) as part of the UK’s in-kind contribution. This paper reports on the steady-state operations, along with a detailed discussion of the cryogenic performance of the facility, including that of the cryoplant.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE09

About •

Received ※ 13 August 2022 — Revised ※ 21 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 04 September 2022

Cite •

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

TUPOGE10

A Final Acceptance Test Kit for Superconducting RF Cryomodules

504

A.J. May, A.E.T. Akintola, S.M. Pattalwar, A. White
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

UKRI-STFC Daresbury Laboratory is currently undertaking several projects involving assembly of superconducting RF cryomodules, including HL-LHC crab cavities and PIP-II HB650 cavities. As part of the final acceptance tests before shipping of the modules, extensive leak testing, pressure testing, and thermal cycling with gaseous and liquid must be performed. A Final Acceptance Test kit (FAT-kit) has been developed to support these tests. The FAT-kit, designed as a single portable unit, sits as an interface module between the cryomodule under test and the required utilities (liquid cryogen supply and return, gaseous cryogen supply and return, warm gas supply and return, vacuum pumps, leak detectors, etc.). The kit features a valve manifold to make or break connections to, from, and between circuits in the cryomodule, safety groupings to provide protection for the circuits as required, and various instrumentation. We report here on the design and commissioning of the kit.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE10

About •

Received ※ 23 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 15 September 2022

Cite •

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

THPOGE05

Some Interesting Observations During Vertical Test on ESS-HB-704 SRF Cavities

812

K.D. Dumbell, A.E.T. Akintola, R.K. Buckley, M.J. Ellis, S. Hitchen, P.C. Hornickel, C.R. Jenkins, J. Lewis, A.J. May, P.A. McIntosh, K.J. Middleman, A.J. Moss, S.M. Pattalwar, M.D. Pendleton, P.A. Smith, A.E. Wheelhouse, S. Wilde
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
M.D. Hancock, J. Hathaway, C. Hodgkinson, G. Jones, M. Lowe, D.A. Mason, G. Miller, J. Mutch, A. Oates, J.T.G. Wilson
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom

The vertical test stand in use at Daresbury has three cavities loaded horizontally at different heights. The jacketed cavities are supplied with liquid helium from a header tank at the top of the configuration. A few cavities have been tested in different positions and the results have been analysed. The pressure of the helium inside the jacketed cavities is affected by the height of the liquid helium column above the jacket and using results from earlier analysis during cool-down enables the pressure of the cavity to be determined from the frequency of operation. Analysis of the effects may allow for corrections to the frequency to be made. In addition to the above observations there have also been some challenges in the operation at higher power as the phase of the self-excited loop driving the system, has been seen to change. This paper discusses some of the observation, analysis of those observations and challenges that are being addressed in the continuing use of this facility.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOGE05

About •

Received ※ 10 August 2022 — Revised ※ 13 August 2022 — Accepted ※ 31 August 2022 — Issue date ※ 15 September 2022

Cite •

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