LINAC2022 - List of Authors (Tantawi, S.G.)

Paper	Title	Page
MOPOJO12	Design of a Compact Linac for High Average Power Radiotherapy	53
	C.D. Nantista, G.B. Bowden, Z. Li, M. Shumail, S.G. Tantawi SLAC, Menlo Park, California, USA B.W. Loo Stanford University, Stanford, California, USA
	We present the design of a compact, 10 MeV, 300 mA pulsed X-band linac developed for medical application. The layout, <1 m including gun, buncher, capture section and current monitor, is of a recent configuration in which the 36 main linac cavities are individually fed in parallel through side waveguide manifolds, allowing for split fabrication. Initially destined for experimental study of FLASH irradiation of mouse tumors, the design was developed as a prototype for realization of a PHASER cancer treatment machine, in which multiple linacs, powered sequentially from a common RF source, are to provide rapid treatment to patients from multiple directions without mechanical movement, delivering dosage on a time scale that essentially freezes the patient. In this paper, we focus on the RF design, beam capture optimization, mechanical design and fabrication of the linac itself, deferring discussion of other important aspects such as window and target design, experimental specification setting, radiation shielding and operations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOJO12
About •	Received ※ 22 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 06 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPOJO16	Cryogenic Accelerator Design for Compact Very High Energy Electron Therapy	62
MOOPA02	use link to see paper's listing under its alternate paper code
	E.J.C. Snively, V. Borzenets, G.B. Bowden, A.K. Krasnykh, Z. Li, C.D. Nantista, M. Oriunno, M. Shumail, S.G. Tantawi SLAC, Menlo Park, California, USA B.W. Loo Stanford University, Stanford, California, USA
	Funding: This research has been supported by the U.S. Department of Energy (DOE) under Contract No. DE-C02-76SF00515. We report on the development of a cryogenic X-band (11.424 GHz) accelerator to provide electron beams for Very High Energy Electron therapy. The distributed coupling linac is designed with a 135° phase advance, capable of producing a 100 MeV/m accelerating gradient in a one-meter structure using only 19 MW when operating at 77 K. This peak power will be achieved through pulse compression of a 5-8 MW few-µs pulse, ensuring compatibility with a commercial power source. We present designs of the cryogenic linac and power distribution system, as well as a room temperature pulse compressor using the HE11 mode in a corrugated cavity. We discuss scaling this compact and economical design into a 16 linac array that can achieve FLASH dose rates (> 40 Gy/s) while eliminating the downtime associated with gantry motion.
	Slides MOPOJO16 [1.320 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOJO16
About •	Received ※ 14 August 2022 — Revised ※ 18 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 26 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPOJO14	Distributed Coupling Linac for Efficient Acceleration of High Charge Electron Bunches	724
	A. Dhar, M. Bai, Z. Li, E.A. Nanni, M.A.K. Othman, S.G. Tantawi, G.R. White SLAC, Menlo Park, California, USA
	Funding: This work was supported by the Department of Energy Contract No. DE-AC02-76SF00515. The Electron Ion Collider requires a pre-injector linac to accelerate large electron bunches from 4 MeV up to 400 MeV over 35 m. Currently this linac is being designed with 3 m long traveling wave structures, which provide a gradient of 16 MV/m. We propose the use of a 1 m distributed coupling design as a potential alternative and future upgrade path to this design. Distributed coupling allows power to be fed into each cavity directly via a waveguide manifold, avoiding on-axis coupling. A distributed coupling structure at S-band was designed to optimize for shunt impedance and large aperture size. This design provides greater efficiency, thereby lowering the number of klystrons required to power the full linac. In addition, particle tracking analysis shows that this linac maintains lower emittance as bunch charge increases to 14 nC and wakefields become more prevalent. We present the design of this distributed coupling structure, as well as progress on structure manufacturing and characterization. F. Willeke, "Electron ion collider conceptual design report 2021," tech. rep., United States, 2021. ** S. Tantawi et al., Phys. Rev. Accel. Beams, vol. 23, p. 092001, Sep 2020.
	Poster THPOJO14 [5.280 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO14
About •	Received ※ 24 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 15 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Design of a Compact Linac for High Average Power Radiotherapy

53

C.D. Nantista, G.B. Bowden, Z. Li, M. Shumail, S.G. Tantawi
SLAC, Menlo Park, California, USA
B.W. Loo
Stanford University, Stanford, California, USA

We present the design of a compact, 10 MeV, 300 mA pulsed X-band linac developed for medical application. The layout, <1 m including gun, buncher, capture section and current monitor, is of a recent configuration in which the 36 main linac cavities are individually fed in parallel through side waveguide manifolds, allowing for split fabrication. Initially destined for experimental study of FLASH irradiation of mouse tumors, the design was developed as a prototype for realization of a PHASER cancer treatment machine, in which multiple linacs, powered sequentially from a common RF source, are to provide rapid treatment to patients from multiple directions without mechanical movement, delivering dosage on a time scale that essentially freezes the patient. In this paper, we focus on the RF design, beam capture optimization, mechanical design and fabrication of the linac itself, deferring discussion of other important aspects such as window and target design, experimental specification setting, radiation shielding and operations.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOJO12

About •

Received ※ 22 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 06 September 2022

Cite •

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

MOPOJO16

Cryogenic Accelerator Design for Compact Very High Energy Electron Therapy

62

MOOPA02

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

E.J.C. Snively, V. Borzenets, G.B. Bowden, A.K. Krasnykh, Z. Li, C.D. Nantista, M. Oriunno, M. Shumail, S.G. Tantawi
SLAC, Menlo Park, California, USA
B.W. Loo
Stanford University, Stanford, California, USA

Funding: This research has been supported by the U.S. Department of Energy (DOE) under Contract No. DE-C02-76SF00515.
We report on the development of a cryogenic X-band (11.424 GHz) accelerator to provide electron beams for Very High Energy Electron therapy. The distributed coupling linac is designed with a 135° phase advance, capable of producing a 100 MeV/m accelerating gradient in a one-meter structure using only 19 MW when operating at 77 K. This peak power will be achieved through pulse compression of a 5-8 MW few-µs pulse, ensuring compatibility with a commercial power source. We present designs of the cryogenic linac and power distribution system, as well as a room temperature pulse compressor using the HE11 mode in a corrugated cavity. We discuss scaling this compact and economical design into a 16 linac array that can achieve FLASH dose rates (> 40 Gy/s) while eliminating the downtime associated with gantry motion.

Slides MOPOJO16 [1.320 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOJO16

About •

Received ※ 14 August 2022 — Revised ※ 18 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 26 September 2022

Cite •

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

THPOJO14

Distributed Coupling Linac for Efficient Acceleration of High Charge Electron Bunches

724

A. Dhar, M. Bai, Z. Li, E.A. Nanni, M.A.K. Othman, S.G. Tantawi, G.R. White
SLAC, Menlo Park, California, USA

Funding: This work was supported by the Department of Energy Contract No. DE-AC02-76SF00515.
The Electron Ion Collider requires a pre-injector linac to accelerate large electron bunches from 4 MeV up to 400 MeV over 35 m*. Currently this linac is being designed with 3 m long traveling wave structures, which provide a gradient of 16 MV/m. We propose the use of a 1 m distributed coupling design as a potential alternative and future upgrade path to this design. Distributed coupling allows power to be fed into each cavity directly via a waveguide manifold, avoiding on-axis coupling**. A distributed coupling structure at S-band was designed to optimize for shunt impedance and large aperture size. This design provides greater efficiency, thereby lowering the number of klystrons required to power the full linac. In addition, particle tracking analysis shows that this linac maintains lower emittance as bunch charge increases to 14 nC and wakefields become more prevalent. We present the design of this distributed coupling structure, as well as progress on structure manufacturing and characterization.
* F. Willeke, "Electron ion collider conceptual design report 2021," tech. rep., United States, 2021.
** S. Tantawi et al., Phys. Rev. Accel. Beams, vol. 23, p. 092001, Sep 2020.

Poster THPOJO14 [5.280 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO14

About •

Received ※ 24 August 2022 — Revised ※ 31 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 15 September 2022

Cite •

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