HB2018 - Classification: Plenary Session

Paper

Title

Page

Challenges in Understanding Space Charge Dynamics

1

H. Bartosik
CERN, Geneva, Switzerland

Space charge effects in high intensity and high brightness synchrotrons can lead to undesired beam emittance growth, beam halo formation and particle loss. A series of dedicated machine experiments has been performed over the past decade in order to study these effects in the particular regime of long-term beam storage (10⁵-10⁶ turns) as required for certain applications. This paper gives an overview of the present understanding of the underlying beam dynamics mechanisms. In particular it focuses on the space charge induced periodic resonance crossing, which has been identified as the main mechanism causing beam degradation in this regime. The challenges in further progressing with the understanding, the modelling and the mitigation of these space charge effects and the resulting beam degradation are discussed. Furthermore, an outlook for possible future directions of studies is presented.

Slides MOA1PL01 [22.877 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOA1PL01

Export •

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

MOA1PL02

Beam Dynamics Challenges for the LHC and Injector Upgrades

8

G. Rumolo
CERN, Geneva, Switzerland

The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) will rely on significantly higher bunch current and brightness to meet the future yearly integrated luminosity target. The implications are twofold. On one side, all the accelerators of the LHC injection chain will have to be upgraded to produce the desired beam parameters. For this purpose, the LHC Injectors Upgrade (LIU) program has been established to implement all the needed modifications for meeting the required beam specifications. These upgrades will lead to the lifting of the main intensity and brightness limitations in the injectors, linked to beam instabilities driven by impedance or electron cloud (e-cloud), and space charge. On the other side, the LHC will have to be able to swallow the new beam parameters. This will mainly require control of impedance driven instabilities and beam-beam effects, and e-cloud mitigation. In this paper, we will focus on proton beams by describing the identified performance limitations of the LHC and its injectors, as well as the actions envisioned to overcome them.

Slides MOA1PL02 [13.138 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOA1PL02

Export •

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

MOA1PL03

Linac4 Commissioning Status and Challenges to Nominal Operation

14

G. Bellodi
CERN, Geneva, Switzerland

Linac4 will be connected to the Proton Synchrotron Booster (PSB) during the next long LHC shutdown in 2019 and it will operationally replace Linac2 as provider of protons to the CERN complex as of 2021. Commissioning to the final beam energy of 160 MeV was achieved by the end of 2016. Linac4 is presently under-going a reliability and beam quality test run to meet the beam specifications and relative tolerances requested by the PSB. In this paper we will detail the main challenges left before achieving nominal operation and we will re-port on the commissioning steps still needed for final validation of machine readiness before start of operation.

Slides MOA1PL03 [20.659 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOA1PL03

Export •

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

MOA2PL01

Status of the CSNS Commissioning

S. Wang
IHEP, Beijing, People's Republic of China

This talk is about Status of the CSNS Commissioning.

Slides MOA2PL01 [13.497 MB]

Export •

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

MOA2PL02

FRIB: Accelerator Physics Update and Initial Commissioning

Q. Zhao
FRIB, East Lansing, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB) is under construction at the Michigan State University. The driver linac consists of a front-end, three superconducting segments connected by two 180-degree bending sections, and a beam delivery system, which will accelerate all stable ions beyond 200 MeV/u and deliver beam to a fragment target with power up to 400 kW. The front-end beam commissioning has been completed recently, and the commissioning of the first three cryomodules is underway. This talk will update the accelerator physics associated with construction and commissioning, present initial beam commissioning results, and report the current status of the project.

Slides MOA2PL02 [10.723 MB]

Export •

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

MOA2PL03

Status of the RAON and its Beam Dynamics

J.-H. Jang
IBS, Daejeon, Republic of Korea

RISP (rare isotope science project) is developing a superconducting linac called RAON which can accelerate uranium beams 200 MeV/u of beam energy and 400 kW of beam power for uranium case. The broad range of ions from proton (A/q = 1) to uranium (A/q=7.2) will be used in RAON facility for the application in basic and applied sciences. RAON can also accelerate rare isotope beams generated by ISOL facility in order to generate more exotic isotope beams. Last year, the initial beam test in the SCL demo facility was successfully finished. Based on the vertical and horizontal tests for several types of SCL cavities, the mass production of the supercoducting cavities and cryomodules will start in this year. The beam optics study on error effects in the linac also confirmed that the beam loss should be less than 1 W/m through the linac. This work summarized the status of the linac development, the beam experiment in the SCL demo facility, and the important results in its beam dynamics.

Slides MOA2PL03 [4.904 MB]

Export •

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

WEA1PL01

What is Missing for the Design and Operation of High-Power Linacs?

195

A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA

Funding: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the U.S. Department of Energy.
The design process, tuning, and operation of high-power linacs are discussed. The inconsistencies between the basic beam physics principles used in the design and the operation practices are considered. The missing components of the beam physics tools for the design and operations are examined, especially for negative hydrogen ions linacs. The diagnostics and online models necessary for tuning and characterization of existing states of the linac are discussed.

Slides WEA1PL01 [3.294 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEA1PL01

Export •

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

WEA1PL02

Nonlinear Integrable Optics to Facilitate High Intensity Operation

A. Valishev
Fermilab, Batavia, Illinois, USA

Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
The nonlinear integrable optics is a novel concept for the use in storage rings. The benefits of strongly nonlinear betatron dynamics include the large particle frequency spread, which facilitates the Landau damping of coherent beam instabilities, and the potential to suppress the nonlinear resonances induced by forces such as space-charge. This talk discusses the recent progress in the numerical studies of the nonlinear integrable optics in high-intensity synchrotrons, presents the status of the first tests at Fermilab's IOTA ring, and provides an outlook for future research.

Slides WEA1PL02 [10.061 MB]

Export •

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

Paper	Title	Page
MOA1PL01	Challenges in Understanding Space Charge Dynamics	1
	H. Bartosik CERN, Geneva, Switzerland
	Space charge effects in high intensity and high brightness synchrotrons can lead to undesired beam emittance growth, beam halo formation and particle loss. A series of dedicated machine experiments has been performed over the past decade in order to study these effects in the particular regime of long-term beam storage (10⁵-10⁶ turns) as required for certain applications. This paper gives an overview of the present understanding of the underlying beam dynamics mechanisms. In particular it focuses on the space charge induced periodic resonance crossing, which has been identified as the main mechanism causing beam degradation in this regime. The challenges in further progressing with the understanding, the modelling and the mitigation of these space charge effects and the resulting beam degradation are discussed. Furthermore, an outlook for possible future directions of studies is presented.
	Slides MOA1PL01 [22.877 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOA1PL01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOA1PL02	Beam Dynamics Challenges for the LHC and Injector Upgrades	8
	G. Rumolo CERN, Geneva, Switzerland
	The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) will rely on significantly higher bunch current and brightness to meet the future yearly integrated luminosity target. The implications are twofold. On one side, all the accelerators of the LHC injection chain will have to be upgraded to produce the desired beam parameters. For this purpose, the LHC Injectors Upgrade (LIU) program has been established to implement all the needed modifications for meeting the required beam specifications. These upgrades will lead to the lifting of the main intensity and brightness limitations in the injectors, linked to beam instabilities driven by impedance or electron cloud (e-cloud), and space charge. On the other side, the LHC will have to be able to swallow the new beam parameters. This will mainly require control of impedance driven instabilities and beam-beam effects, and e-cloud mitigation. In this paper, we will focus on proton beams by describing the identified performance limitations of the LHC and its injectors, as well as the actions envisioned to overcome them.
	Slides MOA1PL02 [13.138 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOA1PL02
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOA1PL03	Linac4 Commissioning Status and Challenges to Nominal Operation	14
	G. Bellodi CERN, Geneva, Switzerland
	Linac4 will be connected to the Proton Synchrotron Booster (PSB) during the next long LHC shutdown in 2019 and it will operationally replace Linac2 as provider of protons to the CERN complex as of 2021. Commissioning to the final beam energy of 160 MeV was achieved by the end of 2016. Linac4 is presently under-going a reliability and beam quality test run to meet the beam specifications and relative tolerances requested by the PSB. In this paper we will detail the main challenges left before achieving nominal operation and we will re-port on the commissioning steps still needed for final validation of machine readiness before start of operation.
	Slides MOA1PL03 [20.659 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-MOA1PL03
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOA2PL01	Status of the CSNS Commissioning
	S. Wang IHEP, Beijing, People's Republic of China
	This talk is about Status of the CSNS Commissioning.
	Slides MOA2PL01 [13.497 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOA2PL02	FRIB: Accelerator Physics Update and Initial Commissioning
	Q. Zhao FRIB, East Lansing, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams (FRIB) is under construction at the Michigan State University. The driver linac consists of a front-end, three superconducting segments connected by two 180-degree bending sections, and a beam delivery system, which will accelerate all stable ions beyond 200 MeV/u and deliver beam to a fragment target with power up to 400 kW. The front-end beam commissioning has been completed recently, and the commissioning of the first three cryomodules is underway. This talk will update the accelerator physics associated with construction and commissioning, present initial beam commissioning results, and report the current status of the project.
	Slides MOA2PL02 [10.723 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOA2PL03	Status of the RAON and its Beam Dynamics
	J.-H. Jang IBS, Daejeon, Republic of Korea
	RISP (rare isotope science project) is developing a superconducting linac called RAON which can accelerate uranium beams 200 MeV/u of beam energy and 400 kW of beam power for uranium case. The broad range of ions from proton (A/q = 1) to uranium (A/q=7.2) will be used in RAON facility for the application in basic and applied sciences. RAON can also accelerate rare isotope beams generated by ISOL facility in order to generate more exotic isotope beams. Last year, the initial beam test in the SCL demo facility was successfully finished. Based on the vertical and horizontal tests for several types of SCL cavities, the mass production of the supercoducting cavities and cryomodules will start in this year. The beam optics study on error effects in the linac also confirmed that the beam loss should be less than 1 W/m through the linac. This work summarized the status of the linac development, the beam experiment in the SCL demo facility, and the important results in its beam dynamics.
	Slides MOA2PL03 [4.904 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEA1PL01	What is Missing for the Design and Operation of High-Power Linacs?	195
	A.P. Shishlo ORNL, Oak Ridge, Tennessee, USA
	Funding: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the U.S. Department of Energy. The design process, tuning, and operation of high-power linacs are discussed. The inconsistencies between the basic beam physics principles used in the design and the operation practices are considered. The missing components of the beam physics tools for the design and operations are examined, especially for negative hydrogen ions linacs. The diagnostics and online models necessary for tuning and characterization of existing states of the linac are discussed.
	Slides WEA1PL01 [3.294 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HB2018-WEA1PL01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEA1PL02	Nonlinear Integrable Optics to Facilitate High Intensity Operation
	A. Valishev Fermilab, Batavia, Illinois, USA
	Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. The nonlinear integrable optics is a novel concept for the use in storage rings. The benefits of strongly nonlinear betatron dynamics include the large particle frequency spread, which facilitates the Landau damping of coherent beam instabilities, and the potential to suppress the nonlinear resonances induced by forces such as space-charge. This talk discusses the recent progress in the numerical studies of the nonlinear integrable optics in high-intensity synchrotrons, presents the status of the first tests at Fermilab's IOTA ring, and provides an outlook for future research.
	Slides WEA1PL02 [10.061 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)