IPAC2021 - List of Authors (Chehab, R.)

Paper	Title	Page
TUXB05	Intense Channeling Radiation as a Tool for a Hybrid Crystal-Based Positron Source for Future Colliders
	L. Bandiera, A. Mazzolari, M. Romagnoni, A.I. Sytov INFN-Ferrara, Ferrara, Italy L. Bomben, V. Mascagna INFN MIB, MILANO, Italy G. Cavoto INFN-Roma, Roma, Italy I. Chaikovska, R. Chehab Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France D. De Salvador Univ. degli Studi di Padova, Padova, Italy L.G. Foggetta INFN/LNF, Frascati, Italy E. Lutsenko, M. Prest Università dell’Insubria & INFN Milano Bicocca, Como, Italy M. Soldani Università degli Studi di Ferrara, Ferrara, Italy V.V. Tikhomirov INP BSU, Minsk, Belarus E. Vallazza INFN-Trieste, Trieste, Italy
	There is a strong need for intense positron sources for future colliders. A crystal-based hybrid positron source could be an alternative to conventional sources based on the e^- conversion into e⁺ in a thick target. The basic idea of the hybrid source is to split the e⁺ converter into a gamma-quanta radiator plus a gamma-to-positron converter. In such a scheme an e^- beam crosses a thin axially oriented crystal with emission of "channeling radiation", characterized by a considerably larger amount of photons w.r.t. standard bremsstrahlung. The net result is an increase in the number of e⁺ produced at the converter target. In the hybrid scheme, only photons reach the converter, thereby reducing the Peak Energy Deposition Density (PEDD) in the target. Here we present the results of a test conducted at the DESY TB with 5.6 GeV e^- interacting with a W crystal. A huge enhancement in the radiated energy and in the photon emission has been recorded and reproduced with Monte Carlo simulations*. This study is relevant for the design of the FCC-ee positron source. Indeed, through Monte Carlo, we also investigated the best parameters of the crystal radiator suited for the FCC-ee e⁺ source. R. Chehab et al. PAC’89,10.1109/PAC.1989.73147 X.Artru et al. NIMB 266 (2008) 3868 * A. Sytov, V. Tikhomirov, L. Bandiera PRAB 22 (2019) 064601
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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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Paper

Title

Page

TUXB05

Intense Channeling Radiation as a Tool for a Hybrid Crystal-Based Positron Source for Future Colliders

L. Bandiera, A. Mazzolari, M. Romagnoni, A.I. Sytov
INFN-Ferrara, Ferrara, Italy
L. Bomben, V. Mascagna
INFN MIB, MILANO, Italy
G. Cavoto
INFN-Roma, Roma, Italy
I. Chaikovska, R. Chehab
Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
D. De Salvador
Univ. degli Studi di Padova, Padova, Italy
L.G. Foggetta
INFN/LNF, Frascati, Italy
E. Lutsenko, M. Prest
Università dell’Insubria & INFN Milano Bicocca, Como, Italy
M. Soldani
Università degli Studi di Ferrara, Ferrara, Italy
V.V. Tikhomirov
INP BSU, Minsk, Belarus
E. Vallazza
INFN-Trieste, Trieste, Italy

There is a strong need for intense positron sources for future colliders. A crystal-based hybrid positron source could be an alternative to conventional sources based on the e^- conversion into e⁺ in a thick target. The basic idea of the hybrid source is to split the e⁺ converter into a gamma-quanta radiator plus a gamma-to-positron converter*. In such a scheme an e^- beam crosses a thin axially oriented crystal with emission of "channeling radiation", characterized by a considerably larger amount of photons w.r.t. standard bremsstrahlung**. The net result is an increase in the number of e⁺ produced at the converter target. In the hybrid scheme, only photons reach the converter, thereby reducing the Peak Energy Deposition Density (PEDD) in the target. Here we present the results of a test conducted at the DESY TB with 5.6 GeV e^- interacting with a W crystal. A huge enhancement in the radiated energy and in the photon emission has been recorded and reproduced with Monte Carlo simulations***. This study is relevant for the design of the FCC-ee positron source. Indeed, through Monte Carlo, we also investigated the best parameters of the crystal radiator suited for the FCC-ee e⁺ source.
* R. Chehab et al. PAC’89,10.1109/PAC.1989.73147
** X.Artru et al. NIMB 266 (2008) 3868
*** A. Sytov, V. Tikhomirov, L. Bandiera PRAB 22 (2019) 064601

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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

Export •

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