IPAC2019 - Table of Session: THYYPLM (Contributed Orals: Photon Sources and Electron Accelerators)

Paper	Title	Page
THYYPLM1	A Novel Compact High Rep-Rate Gamma Ray Source Based on Strongly Tapered Undulator Interactions
MOPRB108	use link to see paper's listing under its alternate paper code
	N.S. Sudar, P. Musumeci UCLA, Los Angeles, USA A.Y. Murokhpresenter RadiaBeam, Los Angeles, California, USA
	Recent experimental efforts have shown strongly tapered undulator interactions to be the most efficient means for exchanging energy between relativistic electron beams and electro-magnetic fields. The Rubicon Inverse Free Electron Laser (IFEL) accelerator demonstrated up to 100 MeV/m acceleration gradients, producing high quality mono-energetic beams. In separate experiments, it was also shown that this acceleration could occur at high rep-rates, and the accelerated beams could be used to produce X-rays through Inverse Compton Scattering (ICS). The Nocibur experiment demonstrated the reverse process, converting 30% of the energy in a relativistic electron beam to coherent radiation. Combining these concepts, we present here a novel scheme where a laser, re-circulated in an optical cavity drives an IFEL interaction, accelerating a 200 MeV beam up to 1 GeV, at which point an ICS interaction can be used to produce gamma rays. This is followed by a Nocibur-like interaction, decelerating the beam below it’s initial energy, replenishing the laser energy absorbed in the acceleration stage as well as compensating for cavity losses.
	Slides THYYPLM1 [5.666 MB]
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THYYPLM2	Two Orbit Operation at Bessy II - During a User Test Week	3419
	P. Goslawski, F. Andreas, F. Armborst, T. Atkinson, J. Feikes, A. Jankowiak, J. Li, T. Mertens, M. Ries, A. Schälicke, G. Schiwietz, G. Wüstefeld HZB, Berlin, Germany
	Operating a storage ring close to a horizontal resonance and manipulating the transverse non-linear beam dynamics can generate stable Transverse Resonance Island Buckets (TRIBs), which give a 2nd stable orbit in the ring. Both orbits can be populated with different electron bunch filling patterns and provide two different radiation sources to the user community. Such a machine setting has been established at BESSY II and was tested under realistic user conditions in a first ’TRIBs/Two Orbit User Test Week’ in February 2018. Results and user feedback will be discussed in this contribution.
	Slides THYYPLM2 [64.754 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THYYPLM2
About •	paper received ※ 14 May 2019 paper accepted ※ 24 May 2019 issue date ※ 21 June 2019
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THYYPLM3	High-Charge Injector for on-Axis Injection Into A High-Performance Storage Ring Light Source	3423
	K.C. Harkay, I.A. Abid, T.G. Berenc, W. Berg, M. Borland, A.R. Brill, D.J. Bromberek, J.M. Byrd, J.R. Calvey, J. Carvelli, J.C. Dooling, L. Emery, T. Fors, G.I. Fystro, A. Goel, D. Hui, R.T. Keane, R. Laird, F. Lenkszus, R.R. Lindberg, T.J. Madden, B.J. Micklich, L.H. Morrison, S.J. Pasky, V. Sajaev, N. Sereno, H. Shang, T.L. Smith, J.B. Stevens, Y. Sun, G.J. Waldschmidt, J. Wang, U. Wienands, K.P. Wootton, A. Xiao, B.X. Yang, Y. Yang, C. Yao ANL, Argonne, Illinois, USA A. Blednykh BNL, Upton, Long Island, New York, USA A.H. Lumpkin Fermilab, Batavia, Illinois, USA
	Funding: Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. Next-generation, high-performance storage ring light sources based on multibend achromat optics will require on-axis injection because of the extremely small dynamic aperture. Injectors will need to supply full-current bunch replacement in the ring with high single-bunch charge for swap-out. For upgrades of existing light sources, such as the Advanced Photon Source Upgrade (APS-U), it is economical to retain the existing injector infrastructure and make appropriate improvements. The challenges to these improvements include achieving high single-bunch charge in the presence of instabilities, beam loading, charge stability and reliability. In this paper, we discuss the rationale for the injector upgrades chosen for APS-U, as well as backup and potential alternate schemes. To date, we have achieved single-bunch charge from the injectors that doubles the original design value, and have a goal to achieve about three times the original design value.
	Slides THYYPLM3 [1.499 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THYYPLM3
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

THYYPLM1

A Novel Compact High Rep-Rate Gamma Ray Source Based on Strongly Tapered Undulator Interactions

use link to see paper's listing under its alternate paper code

N.S. Sudar, P. Musumeci
UCLA, Los Angeles, USA
A.Y. Murokhpresenter
RadiaBeam, Los Angeles, California, USA

Recent experimental efforts have shown strongly tapered undulator interactions to be the most efficient means for exchanging energy between relativistic electron beams and electro-magnetic fields. The Rubicon Inverse Free Electron Laser (IFEL) accelerator demonstrated up to 100 MeV/m acceleration gradients, producing high quality mono-energetic beams. In separate experiments, it was also shown that this acceleration could occur at high rep-rates, and the accelerated beams could be used to produce X-rays through Inverse Compton Scattering (ICS). The Nocibur experiment demonstrated the reverse process, converting 30% of the energy in a relativistic electron beam to coherent radiation. Combining these concepts, we present here a novel scheme where a laser, re-circulated in an optical cavity drives an IFEL interaction, accelerating a 200 MeV beam up to 1 GeV, at which point an ICS interaction can be used to produce gamma rays. This is followed by a Nocibur-like interaction, decelerating the beam below it’s initial energy, replenishing the laser energy absorbed in the acceleration stage as well as compensating for cavity losses.

Slides THYYPLM1 [5.666 MB]

Export •

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

THYYPLM2

Two Orbit Operation at Bessy II - During a User Test Week

3419

P. Goslawski, F. Andreas, F. Armborst, T. Atkinson, J. Feikes, A. Jankowiak, J. Li, T. Mertens, M. Ries, A. Schälicke, G. Schiwietz, G. Wüstefeld
HZB, Berlin, Germany

Operating a storage ring close to a horizontal resonance and manipulating the transverse non-linear beam dynamics can generate stable Transverse Resonance Island Buckets (TRIBs), which give a 2nd stable orbit in the ring. Both orbits can be populated with different electron bunch filling patterns and provide two different radiation sources to the user community. Such a machine setting has been established at BESSY II and was tested under realistic user conditions in a first ’TRIBs/Two Orbit User Test Week’ in February 2018. Results and user feedback will be discussed in this contribution.

Slides THYYPLM2 [64.754 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THYYPLM2

About •

paper received ※ 14 May 2019 paper accepted ※ 24 May 2019 issue date ※ 21 June 2019

Export •

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

THYYPLM3

High-Charge Injector for on-Axis Injection Into A High-Performance Storage Ring Light Source

3423

K.C. Harkay, I.A. Abid, T.G. Berenc, W. Berg, M. Borland, A.R. Brill, D.J. Bromberek, J.M. Byrd, J.R. Calvey, J. Carvelli, J.C. Dooling, L. Emery, T. Fors, G.I. Fystro, A. Goel, D. Hui, R.T. Keane, R. Laird, F. Lenkszus, R.R. Lindberg, T.J. Madden, B.J. Micklich, L.H. Morrison, S.J. Pasky, V. Sajaev, N. Sereno, H. Shang, T.L. Smith, J.B. Stevens, Y. Sun, G.J. Waldschmidt, J. Wang, U. Wienands, K.P. Wootton, A. Xiao, B.X. Yang, Y. Yang, C. Yao
ANL, Argonne, Illinois, USA
A. Blednykh
BNL, Upton, Long Island, New York, USA
A.H. Lumpkin
Fermilab, Batavia, Illinois, USA

Funding: Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
Next-generation, high-performance storage ring light sources based on multibend achromat optics will require on-axis injection because of the extremely small dynamic aperture. Injectors will need to supply full-current bunch replacement in the ring with high single-bunch charge for swap-out. For upgrades of existing light sources, such as the Advanced Photon Source Upgrade (APS-U), it is economical to retain the existing injector infrastructure and make appropriate improvements. The challenges to these improvements include achieving high single-bunch charge in the presence of instabilities, beam loading, charge stability and reliability. In this paper, we discuss the rationale for the injector upgrades chosen for APS-U, as well as backup and potential alternate schemes. To date, we have achieved single-bunch charge from the injectors that doubles the original design value, and have a goal to achieve about three times the original design value.

Slides THYYPLM3 [1.499 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THYYPLM3

About •

paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

Export •

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