NAPAC2022 - List of Authors (Ainsworth, R.)

Paper	Title	Page
MOPA14	A Wide Dynamic-Range Halo Monitor for 8 GeV Proton Beams at FNAL	75
	Y. Hashimoto, C. Ohmori, T. Sasaki, M. Tejima, T. Toyama, M. Uota KEK, Ibaraki, Japan R. Ainsworth Fermilab, Batavia, Illinois, USA H. Sakai Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan Y. Sato J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	Funding: Foundation: U.S.-Japan Science and Technology Cooperation Program in High Energy Physics. Eliminating harmful beam halos is the most important technique for high-intensity proton accelerators. Therefore, beam halo diagnosis is indispensable and becomes more and more important. At J-PARC, a wide dynamic range monitor was installed in the beam transport line in 2012. The device is a two-dimensional beam profile monitor [, ], and it has a dynamic range of approximately six digits of magnitude by using Optical Transition Radiation and fluorescence screens. The FNAL accelerator complex has been upgrading through increased beam intensity and beam quality. A new beam halo diagnostic device is required in the beam transport line between the booster and recycler. It will be manufactured in a collaboration between J-PARC and FNAL as a part of the U.S.-Japan Science and Technology Cooperation Program in High Energy Physics. We are redesigning the monitor to satisfy FNAL specifications for beam energy, intensity, and size. The equipment will be manufactured at J-PARC and then shipped to FNAL in 2024. In this report, the design of the device will be described. https://accelconf.web.cern.ch/IBIC2013/papers/tucl2.pdf ** http://accelconf.web.cern.ch/HB2014/papers/tuo2ab04.pdf
DOI •	reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA14
About •	Received ※ 03 August 2022 — Revised ※ 07 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 09 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPA18	Residual Dose and Environmental Monitoring for the Fermilab Main Injector Tunnel Using the Data Acquisition Logging Engine (Dale)	87
	N. Chelidze, R. Ainsworth, B.C. Brown, D. Capista, K.J. Hazelwood, D.K. Morris, M.J. Murphy Fermilab, Batavia, Illinois, USA
	Funding: Fermi National Accelerator Laboratory The Recycler and the Main Injector are part of the Fermilab Accelerator complex used to deliver proton beam to the different experiments. It is very important to control and minimize losses in both machines during operation, to reduce personnel dose from residual activation and to preserve component lifetime. To minimize losses, we need to identify the loss points and adjust the components accordingly. The Data Acquisition Loss Engine (DALE) platform has been developed within the Main Injector department and upgraded throughout the years. DALE is used to survey the entire enclosure for residual dose rates and environmental readings when unrestricted access to the enclosure is possible. Currently DALE has two radiation meters, which are aligned along each machine, so loss points can be identified for both at the same time. DALE attaches to the enclosure carts and is continuously in motion monitoring dose rates and other environmental readings. In this paper we will describe how DALE is used to provide radiation maps of the residual dose rates in the enclosure. We will also compare the loss points with the Beam Loss monitor data.
DOI •	reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA18
About •	Received ※ 02 August 2022 — Revised ※ 05 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 21 September 2022
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MOPA19	The Effect of the Main Injector Ramp on the Recycler	90
	N. Chelidze, R. Ainsworth, K.J. Hazelwood Fermilab, Batavia, Illinois, USA
	The Recycler and Main Injector are part of the Fermilab Accelerator complex used to deliver a high power proton beam. Both machines share the same enclosure with the Recycler mounted 6 ft above the Main Injector. The Main Injector accelerates beam from 8 GeV to 120 GeV. While the majority of the Recycler has mu metal shielding, the effect of the Main Injector ramp is still significant and can affect both the tunes and the orbit. In this paper, we detail the size of these effects.
DOI •	reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA19
About •	Received ※ 02 August 2022 — Accepted ※ 04 August 2022 — Issue date ※ 23 August 2022
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MOPA33	Waker Experiments at Fermilab Recycler Ring	124
	O. Mohsen, R. Ainsworth, N. Eddy Fermilab, Batavia, Illinois, USA
	Attaining high-intensity hadron beams is often limited due to the transverse collective instabilities, whose understanding is thus required to see and possibly extend the intensity limitations. To explore such instabilities, a novel artificial wake system, the waker, has been built and tested at the Fermilab Recycler Ring (RR). In this report, we show recent upgrades of the waker. Also, we present experimental studies of instabilities at various space charge and wake parameters.
DOI •	reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA33
About •	Received ※ 03 August 2022 — Revised ※ 08 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 28 August 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEYE3	Improvements to the Recycler/Main Injector to Deliver 850 kW+	578
	R. Ainsworth, P. Adamson, D. Capista, N. Chelidze, K.J. Hazelwood, I. Kourbanis, O. Mohsen, D.K. Morris, M.J. Murphy, M. Wren, M. Xiao Fermilab, Batavia, Illinois, USA C.E. Gonzalez-Ortiz MSU, East Lansing, Michigan, USA
	The Main Injector is used to deliver a 120 GeV high power proton beam for Neutrino experiments. The design power of 700 kW was reached in early 2017 but further improvements have seen a new sustained peak power of 893 kW. Two of the main improvements include the shortening of the Main Injector ramp length as well optimizing the slip-stacking procedure performed in the Recycler to reduce the amount of uncaptured beam making its way into the Main Injector. These improvements will be discussed in this paper as well future upgrades to reach higher beam powers.
	Slides WEYE3 [24.715 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEYE3
About •	Received ※ 02 August 2022 — Revised ※ 08 August 2022 — Accepted ※ 10 August 2022 — Issue date ※ 18 August 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEYE4	Electron Cloud Simulations in the Fermilab Recycler	581
	A.P. Schreckenberger University of Illinois at Urbana-Champaign, Urbana, USA R. Ainsworth Fermilab, Batavia, Illinois, USA
	We present a simulation study to characterize the stability region of the Fermilab Recycler Ring in the context of secondary emission yield (SEY). Interactions between electrons and beam pipe material can produce electron clouds that jeopardize beam stability in certain focusing configurations. Such an instability was documented in the Recycler, and the work presented here reflects improvements to better understand that finding. We incorporated the Furman-Pivi Model into a PyECLOUD analysis, and we determined the instability threshold given various bunch lengths, beam intensities, SEY magnitudes, and model parameters.
	Slides WEYE4 [2.096 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEYE4
About •	Received ※ 01 August 2022 — Revised ※ 06 August 2022 — Accepted ※ 08 August 2022 — Issue date ※ 30 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

A Wide Dynamic-Range Halo Monitor for 8 GeV Proton Beams at FNAL

75

Y. Hashimoto, C. Ohmori, T. Sasaki, M. Tejima, T. Toyama, M. Uota
KEK, Ibaraki, Japan
R. Ainsworth
Fermilab, Batavia, Illinois, USA
H. Sakai
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
Y. Sato
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

Funding: Foundation: U.S.-Japan Science and Technology Cooperation Program in High Energy Physics.
Eliminating harmful beam halos is the most important technique for high-intensity proton accelerators. Therefore, beam halo diagnosis is indispensable and becomes more and more important. At J-PARC, a wide dynamic range monitor was installed in the beam transport line in 2012. The device is a two-dimensional beam profile monitor [*, **], and it has a dynamic range of approximately six digits of magnitude by using Optical Transition Radiation and fluorescence screens. The FNAL accelerator complex has been upgrading through increased beam intensity and beam quality. A new beam halo diagnostic device is required in the beam transport line between the booster and recycler. It will be manufactured in a collaboration between J-PARC and FNAL as a part of the U.S.-Japan Science and Technology Cooperation Program in High Energy Physics. We are redesigning the monitor to satisfy FNAL specifications for beam energy, intensity, and size. The equipment will be manufactured at J-PARC and then shipped to FNAL in 2024. In this report, the design of the device will be described.
* https://accelconf.web.cern.ch/IBIC2013/papers/tucl2.pdf
** http://accelconf.web.cern.ch/HB2014/papers/tuo2ab04.pdf

DOI •

reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA14

About •

Received ※ 03 August 2022 — Revised ※ 07 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 09 September 2022

Cite •

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

MOPA18

Residual Dose and Environmental Monitoring for the Fermilab Main Injector Tunnel Using the Data Acquisition Logging Engine (Dale)

87

N. Chelidze, R. Ainsworth, B.C. Brown, D. Capista, K.J. Hazelwood, D.K. Morris, M.J. Murphy
Fermilab, Batavia, Illinois, USA

Funding: Fermi National Accelerator Laboratory
The Recycler and the Main Injector are part of the Fermilab Accelerator complex used to deliver proton beam to the different experiments. It is very important to control and minimize losses in both machines during operation, to reduce personnel dose from residual activation and to preserve component lifetime. To minimize losses, we need to identify the loss points and adjust the components accordingly. The Data Acquisition Loss Engine (DALE) platform has been developed within the Main Injector department and upgraded throughout the years. DALE is used to survey the entire enclosure for residual dose rates and environmental readings when unrestricted access to the enclosure is possible. Currently DALE has two radiation meters, which are aligned along each machine, so loss points can be identified for both at the same time. DALE attaches to the enclosure carts and is continuously in motion monitoring dose rates and other environmental readings. In this paper we will describe how DALE is used to provide radiation maps of the residual dose rates in the enclosure. We will also compare the loss points with the Beam Loss monitor data.

DOI •

reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA18

About •

Received ※ 02 August 2022 — Revised ※ 05 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 21 September 2022

Cite •

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

MOPA19

The Effect of the Main Injector Ramp on the Recycler

90

N. Chelidze, R. Ainsworth, K.J. Hazelwood
Fermilab, Batavia, Illinois, USA

The Recycler and Main Injector are part of the Fermilab Accelerator complex used to deliver a high power proton beam. Both machines share the same enclosure with the Recycler mounted 6 ft above the Main Injector. The Main Injector accelerates beam from 8 GeV to 120 GeV. While the majority of the Recycler has mu metal shielding, the effect of the Main Injector ramp is still significant and can affect both the tunes and the orbit. In this paper, we detail the size of these effects.

DOI •

reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA19

About •

Received ※ 02 August 2022 — Accepted ※ 04 August 2022 — Issue date ※ 23 August 2022

Cite •

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

MOPA33

Waker Experiments at Fermilab Recycler Ring

124

O. Mohsen, R. Ainsworth, N. Eddy
Fermilab, Batavia, Illinois, USA

Attaining high-intensity hadron beams is often limited due to the transverse collective instabilities, whose understanding is thus required to see and possibly extend the intensity limitations. To explore such instabilities, a novel artificial wake system, the waker, has been built and tested at the Fermilab Recycler Ring (RR). In this report, we show recent upgrades of the waker. Also, we present experimental studies of instabilities at various space charge and wake parameters.

DOI •

reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA33

About •

Received ※ 03 August 2022 — Revised ※ 08 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 28 August 2022

Cite •

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

WEYE3

Improvements to the Recycler/Main Injector to Deliver 850 kW+

578

R. Ainsworth, P. Adamson, D. Capista, N. Chelidze, K.J. Hazelwood, I. Kourbanis, O. Mohsen, D.K. Morris, M.J. Murphy, M. Wren, M. Xiao
Fermilab, Batavia, Illinois, USA
C.E. Gonzalez-Ortiz
MSU, East Lansing, Michigan, USA

The Main Injector is used to deliver a 120 GeV high power proton beam for Neutrino experiments. The design power of 700 kW was reached in early 2017 but further improvements have seen a new sustained peak power of 893 kW. Two of the main improvements include the shortening of the Main Injector ramp length as well optimizing the slip-stacking procedure performed in the Recycler to reduce the amount of uncaptured beam making its way into the Main Injector. These improvements will be discussed in this paper as well future upgrades to reach higher beam powers.

Slides WEYE3 [24.715 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEYE3

About •

Received ※ 02 August 2022 — Revised ※ 08 August 2022 — Accepted ※ 10 August 2022 — Issue date ※ 18 August 2022

Cite •

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

WEYE4

Electron Cloud Simulations in the Fermilab Recycler

581

A.P. Schreckenberger
University of Illinois at Urbana-Champaign, Urbana, USA
R. Ainsworth
Fermilab, Batavia, Illinois, USA

We present a simulation study to characterize the stability region of the Fermilab Recycler Ring in the context of secondary emission yield (SEY). Interactions between electrons and beam pipe material can produce electron clouds that jeopardize beam stability in certain focusing configurations. Such an instability was documented in the Recycler, and the work presented here reflects improvements to better understand that finding. We incorporated the Furman-Pivi Model into a PyECLOUD analysis, and we determined the instability threshold given various bunch lengths, beam intensities, SEY magnitudes, and model parameters.

Slides WEYE4 [2.096 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEYE4

About •

Received ※ 01 August 2022 — Revised ※ 06 August 2022 — Accepted ※ 08 August 2022 — Issue date ※ 30 September 2022

Cite •

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