IPAC2021 - List of Authors (Latina, A.)

Paper	Title	Page
MOPAB168	Nanoplasmonic Accelerators Towards Tens of TeraVolts per Meter Gradients Using Nanomaterials	574
	A.A. Sahai, M. Golkowski, V. Harid CU Denver, Denver, Colorado, USA C. Joshi UCLA, Los Angeles, California, USA T.C. Katsouleas Duke ECE, Durham, North Carolina, USA A. Latina, F. Zimmermann CERN, Geneva, Switzerland J. Resta-López Cockcroft Institute, Warrington, Cheshire, United Kingdom P. Taborek UCI, Irvine, California, USA A.G.R. Thomas University of Michigan, Ann Arbor, Michigan, USA
	Funding: University of Colorado Denver Ultra-high gradients which are critical for future advances in high-energy physics, have so far relied on plasma and dielectric accelerating structures. While bulk crystals were predicted to offer unparalleled TV/m gradients that are at least two orders of magnitude higher than gaseous plasmas, crystal-based acceleration has not been realized in practice. We have developed the concept of nanoplasmonic crunch-in surface modes which utilizes the tunability of collective oscillations in nanomaterials to open up unprecedented tens of TV/m gradients. Particle beams interacting with nanomaterials that have vacuum-like core regions, experience minimal disruptive effects such as filamentation and collisions, while the beam-driven crunch-in modes sustain tens of TV/m gradients. Moreover, as the effective apertures for transverse and longitudinal crunch-in wakes are different, the limitation of traditional scaling of structure wakefields to smaller dimensions is significantly relaxed. The SLAC FACET-II experiment of the nano2WA collaboration will utilize ultra-short, high-current electron beams to excite nonlinear plasmonic modes and demonstrate this possibility. * doi:10.1109/ACCESS.2021.3070798 doi:10.1142/S0217751X19430097 * indico.fnal.gov/event/19478/contributions/52561 **** indico.cern.ch/event/867535/contributions/3716404
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB168
About •	paper received ※ 11 May 2021 paper accepted ※ 08 June 2021 issue date ※ 20 August 2021
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WEPAB013	A New Algorithm for Positron Source Parameter Optimisation	2609
	Y. Zhao, L. Ma SDU, Shandong, People’s Republic of China S. Döbert, A. Latina CERN, Geneva, Switzerland
	In this report, we proposed a new simple and efficient algorithm for positron source parameter optimisation, which is based on iterations of scan of free parameters in the simulation. The new algorithm is fast, simple and convincing since the results can be visually drawn and flexibly tuned and it has an advantage that it can easily handle realistic parametric problems with more than one objective quantities to optimise. The optimisation of the main parameters of the CLIC positron source at the 380 GeV stage is presented as an example to demonstrate how the algorithm works.
	Poster WEPAB013 [1.352 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB013
About •	paper received ※ 15 May 2021 paper accepted ※ 24 June 2021 issue date ※ 17 August 2021
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WEPAB014	Optimisation of the CLIC Positron Source	2613
	Y. Zhao, L. Ma SDU, Shandong, People’s Republic of China H.M.A. Bajas, S. Döbert, A. Latina CERN, Geneva, Switzerland
	In this report, we reoptimised the CLIC positron source at all collision energy stages. Simulation, optimisation algorithm and results were all improved compared with previous studies. Two different target schemes were studied and compared in terms of the advantages and disadvantages. The spot size of the injected electron beam was also optimised to achieve a compromise between large positron yields and safe energy deposition. The matching device for the capture of positrons was simulated and optimised with both improved analytic and realistic field maps. Conical aperture and front and rear gaps of the matching device were also considered for the first time. The optimised positron source is expected to have the lowest cost.
	Poster WEPAB014 [1.825 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB014
About •	paper received ※ 15 May 2021 paper accepted ※ 21 June 2021 issue date ※ 25 August 2021
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WEPAB015	Comparison of Different Matching Device Field Profiles for the FCC-ee Positron Source	2617
	Y. Zhao, L. Ma SDU, Shandong, People’s Republic of China B. Auchmann, P. Craievich, J. Kosse, R. Zennaro PSI, Villigen PSI, Switzerland I. Chaikovska, R. Chehab Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France S. Döbert, A. Latina CERN, Geneva, Switzerland P.V. Martyshkin BINP SB RAS, Novosibirsk, Russia
	In this report, we compared different matching device field profiles for the FCC-ee positron source. The matching device is used to capture positrons with magnetic field. A flux concentrator was designed with a conical inner chamber. A smaller aperture and a larger aperture were studied. An analytic field profile was also studied using an adiabatic formula. The peak field of the analytic profile as well as beam and target parameters was optimised to achieve a maximum positron yield. A safe energy deposition in the target was guaranteed by requiring a constraint on the deposited power and peak energy deposition density.
	Poster WEPAB015 [3.066 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB015
About •	paper received ※ 15 May 2021 paper accepted ※ 23 June 2021 issue date ※ 30 August 2021
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WEPAB028	MAD-X for Future Accelerators	2664
	T.H.B. Persson, H. Burkhardt, L. Deniau, A. Latina, P.K. Skowroński CERN, Geneva, Switzerland
	The feasibility and performance of the future accelerators must, to a large extent, be predicted by simulation codes. This implies that simulation codes need to include effects that previously played a minor role. For example, in large electron machines like the FCC-ee the large energy variation along the ring requires that the magnets strength is adjusted to the beam energy at that location, normally referred to as tapering. In this article, we present new features implemented in the MAD-X code to enable and facilitate simulations of future colliders.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB028
About •	paper received ※ 17 May 2021 paper accepted ※ 06 July 2021 issue date ※ 27 August 2021
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THPAB203	Update of the Tracking Code RF-Track	4180
	A. Latina CERN, Geneva, Switzerland
	During the last couple of years, the RF-Track particle tracking code has seen a tremendous increase in the number of its applications: medical linacs, compact injector electron guns, and positron sources are among the main ones. Following a work of consolidation of its internal structure, new simulation capabilities have been introduced, together with several new effects: arbitrary orientation of elements in space, full element overlap, short- and long-range wakefields, and laser-beam interaction through Compton scattering are the most significant ones. In this paper, some of these new features are presented and discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB203
About •	paper received ※ 14 May 2021 paper accepted ※ 02 August 2021 issue date ※ 01 September 2021
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THPAB209	Tracking Complex Re-Circulating Machines with PLACET2	4197
	R.A.J. Costa, A. Latina CERN, Geneva, Switzerland
	We present the latest version of the multi-particle tracking package PLACET2. This software was designed to track multiple electron bunches through re-circulating machines with complex topologies, such as the recombination complex of the Compact Linear Collider (CLIC), energy-recovery linacs such as the Large Hadron-Electron Collider (LHeC), racetracks and others. This update also expands the capabilities of PLACET2 to track heavier particles such as muons. In addition to simulation, PLACET2 was also developed to allow beamline optimization scans, evaluating beam properties and tuning the beamline parameters at runtime either standalone or accessing the optimization tools present in the Octave and Python packages, with which it interfaces. This paper presents and benchmarks PLACET2’s latest features, such as coherent and incoherent synchrotron radiation, long and short wakefields and power extraction.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB209
About •	paper received ※ 18 May 2021 paper accepted ※ 13 July 2021 issue date ※ 27 August 2021
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FRXB02	Development of 36 GHz RF Systems for RF Linearisers	4518
	A. Castilla, G. Burt Lancaster University, Lancaster, United Kingdom M. Behtouei, B. Spataro INFN/LNF, Frascati, Italy G. Burt Cockcroft Institute, Warrington, Cheshire, United Kingdom J.C. Cai, A. Castilla, A. Latina, X. Liu, I. Syratchev, X.W. Wu, W. Wuensch CERN, Meyrin, Switzerland J.C. Cai, A. Castilla Cockcroft Institute, Lancaster University, Lancaster, United Kingdom A.W. Cross, L. Zhang USTRAT/SUPA, Glasgow, United Kingdom L.J.R. Nix University of Strathclyde, Glasgow, United Kingdom
	Funding: This project has received funding from the European Union’s Horizon2020 research and innovation programme under grant agreement No 777431. As part of the deign studies, the CompactLight project plans to use an injector in the C-band. Which constitutes a particular complication for the harmonic system in charge of linearising the beam’s phase space, since it means its operation frequency could be higher than the standard X-band RF technologies. In the present work, we investigated a 36 GHz (Ka-band) as the ideal frequency for the harmonic system. A set of structure designs are presented as candidates for the lineariser, based on different powering schemes and pulse compressor technologies. The comparison is made both in terms of beam dynamics and RF performance. Given the phase stability requirements for the MW class RF sources needed for this system, we performed careful studies of a Gyro-Klystron and a multi-beam klystron as potential RF sources, with both showing up to 3 MW available power using moderate modulator voltages. Alternatives for pulse compression at Ka-band are also discussed in this work.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-FRXB02
About •	paper received ※ 17 May 2021 paper accepted ※ 19 July 2021 issue date ※ 25 August 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Nanoplasmonic Accelerators Towards Tens of TeraVolts per Meter Gradients Using Nanomaterials

574

A.A. Sahai, M. Golkowski, V. Harid
CU Denver, Denver, Colorado, USA
C. Joshi
UCLA, Los Angeles, California, USA
T.C. Katsouleas
Duke ECE, Durham, North Carolina, USA
A. Latina, F. Zimmermann
CERN, Geneva, Switzerland
J. Resta-López
Cockcroft Institute, Warrington, Cheshire, United Kingdom
P. Taborek
UCI, Irvine, California, USA
A.G.R. Thomas
University of Michigan, Ann Arbor, Michigan, USA

Funding: University of Colorado Denver
Ultra-high gradients which are critical for future advances in high-energy physics, have so far relied on plasma and dielectric accelerating structures. While bulk crystals were predicted to offer unparalleled TV/m gradients that are at least two orders of magnitude higher than gaseous plasmas, crystal-based acceleration has not been realized in practice. We have developed the concept of nanoplasmonic crunch-in surface modes which utilizes the tunability of collective oscillations in nanomaterials to open up unprecedented tens of TV/m gradients. Particle beams interacting with nanomaterials that have vacuum-like core regions, experience minimal disruptive effects such as filamentation and collisions, while the beam-driven crunch-in modes sustain tens of TV/m gradients. Moreover, as the effective apertures for transverse and longitudinal crunch-in wakes are different, the limitation of traditional scaling of structure wakefields to smaller dimensions is significantly relaxed. The SLAC FACET-II experiment of the nano2WA collaboration will utilize ultra-short, high-current electron beams to excite nonlinear plasmonic modes and demonstrate this possibility.
* doi:10.1109/ACCESS.2021.3070798
** doi:10.1142/S0217751X19430097
*** indico.fnal.gov/event/19478/contributions/52561
**** indico.cern.ch/event/867535/contributions/3716404

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB168

About •

paper received ※ 11 May 2021 paper accepted ※ 08 June 2021 issue date ※ 20 August 2021

Export •

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

WEPAB013

A New Algorithm for Positron Source Parameter Optimisation

2609

Y. Zhao, L. Ma
SDU, Shandong, People’s Republic of China
S. Döbert, A. Latina
CERN, Geneva, Switzerland

In this report, we proposed a new simple and efficient algorithm for positron source parameter optimisation, which is based on iterations of scan of free parameters in the simulation. The new algorithm is fast, simple and convincing since the results can be visually drawn and flexibly tuned and it has an advantage that it can easily handle realistic parametric problems with more than one objective quantities to optimise. The optimisation of the main parameters of the CLIC positron source at the 380 GeV stage is presented as an example to demonstrate how the algorithm works.

Poster WEPAB013 [1.352 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB013

About •

paper received ※ 15 May 2021 paper accepted ※ 24 June 2021 issue date ※ 17 August 2021

Export •

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

WEPAB014

Optimisation of the CLIC Positron Source

2613

Y. Zhao, L. Ma
SDU, Shandong, People’s Republic of China
H.M.A. Bajas, S. Döbert, A. Latina
CERN, Geneva, Switzerland

In this report, we reoptimised the CLIC positron source at all collision energy stages. Simulation, optimisation algorithm and results were all improved compared with previous studies. Two different target schemes were studied and compared in terms of the advantages and disadvantages. The spot size of the injected electron beam was also optimised to achieve a compromise between large positron yields and safe energy deposition. The matching device for the capture of positrons was simulated and optimised with both improved analytic and realistic field maps. Conical aperture and front and rear gaps of the matching device were also considered for the first time. The optimised positron source is expected to have the lowest cost.

Poster WEPAB014 [1.825 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB014

About •

paper received ※ 15 May 2021 paper accepted ※ 21 June 2021 issue date ※ 25 August 2021

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

WEPAB015

Comparison of Different Matching Device Field Profiles for the FCC-ee Positron Source

2617

Y. Zhao, L. Ma
SDU, Shandong, People’s Republic of China
B. Auchmann, P. Craievich, J. Kosse, R. Zennaro
PSI, Villigen PSI, Switzerland
I. Chaikovska, R. Chehab
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
S. Döbert, A. Latina
CERN, Geneva, Switzerland
P.V. Martyshkin
BINP SB RAS, Novosibirsk, Russia

In this report, we compared different matching device field profiles for the FCC-ee positron source. The matching device is used to capture positrons with magnetic field. A flux concentrator was designed with a conical inner chamber. A smaller aperture and a larger aperture were studied. An analytic field profile was also studied using an adiabatic formula. The peak field of the analytic profile as well as beam and target parameters was optimised to achieve a maximum positron yield. A safe energy deposition in the target was guaranteed by requiring a constraint on the deposited power and peak energy deposition density.

Poster WEPAB015 [3.066 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB015

About •

paper received ※ 15 May 2021 paper accepted ※ 23 June 2021 issue date ※ 30 August 2021

Export •

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

WEPAB028

MAD-X for Future Accelerators

2664

T.H.B. Persson, H. Burkhardt, L. Deniau, A. Latina, P.K. Skowroński
CERN, Geneva, Switzerland

The feasibility and performance of the future accelerators must, to a large extent, be predicted by simulation codes. This implies that simulation codes need to include effects that previously played a minor role. For example, in large electron machines like the FCC-ee the large energy variation along the ring requires that the magnets strength is adjusted to the beam energy at that location, normally referred to as tapering. In this article, we present new features implemented in the MAD-X code to enable and facilitate simulations of future colliders.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB028

About •

paper received ※ 17 May 2021 paper accepted ※ 06 July 2021 issue date ※ 27 August 2021

Export •

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

THPAB203

Update of the Tracking Code RF-Track

4180

A. Latina
CERN, Geneva, Switzerland

During the last couple of years, the RF-Track particle tracking code has seen a tremendous increase in the number of its applications: medical linacs, compact injector electron guns, and positron sources are among the main ones. Following a work of consolidation of its internal structure, new simulation capabilities have been introduced, together with several new effects: arbitrary orientation of elements in space, full element overlap, short- and long-range wakefields, and laser-beam interaction through Compton scattering are the most significant ones. In this paper, some of these new features are presented and discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB203

About •

paper received ※ 14 May 2021 paper accepted ※ 02 August 2021 issue date ※ 01 September 2021

Export •

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

THPAB209

Tracking Complex Re-Circulating Machines with PLACET2

4197

R.A.J. Costa, A. Latina
CERN, Geneva, Switzerland

We present the latest version of the multi-particle tracking package PLACET2. This software was designed to track multiple electron bunches through re-circulating machines with complex topologies, such as the recombination complex of the Compact Linear Collider (CLIC), energy-recovery linacs such as the Large Hadron-Electron Collider (LHeC), racetracks and others. This update also expands the capabilities of PLACET2 to track heavier particles such as muons. In addition to simulation, PLACET2 was also developed to allow beamline optimization scans, evaluating beam properties and tuning the beamline parameters at runtime either standalone or accessing the optimization tools present in the Octave and Python packages, with which it interfaces. This paper presents and benchmarks PLACET2’s latest features, such as coherent and incoherent synchrotron radiation, long and short wakefields and power extraction.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB209

About •

paper received ※ 18 May 2021 paper accepted ※ 13 July 2021 issue date ※ 27 August 2021

Export •

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

FRXB02

Development of 36 GHz RF Systems for RF Linearisers

4518

A. Castilla, G. Burt
Lancaster University, Lancaster, United Kingdom
M. Behtouei, B. Spataro
INFN/LNF, Frascati, Italy
G. Burt
Cockcroft Institute, Warrington, Cheshire, United Kingdom
J.C. Cai, A. Castilla, A. Latina, X. Liu, I. Syratchev, X.W. Wu, W. Wuensch
CERN, Meyrin, Switzerland
J.C. Cai, A. Castilla
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
A.W. Cross, L. Zhang
USTRAT/SUPA, Glasgow, United Kingdom
L.J.R. Nix
University of Strathclyde, Glasgow, United Kingdom

Funding: This project has received funding from the European Union’s Horizon2020 research and innovation programme under grant agreement No 777431.
As part of the deign studies, the CompactLight project plans to use an injector in the C-band. Which constitutes a particular complication for the harmonic system in charge of linearising the beam’s phase space, since it means its operation frequency could be higher than the standard X-band RF technologies. In the present work, we investigated a 36 GHz (Ka-band) as the ideal frequency for the harmonic system. A set of structure designs are presented as candidates for the lineariser, based on different powering schemes and pulse compressor technologies. The comparison is made both in terms of beam dynamics and RF performance. Given the phase stability requirements for the MW class RF sources needed for this system, we performed careful studies of a Gyro-Klystron and a multi-beam klystron as potential RF sources, with both showing up to 3 MW available power using moderate modulator voltages. Alternatives for pulse compression at Ka-band are also discussed in this work.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-FRXB02

About •

paper received ※ 17 May 2021 paper accepted ※ 19 July 2021 issue date ※ 25 August 2021

Export •

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