IBIC2020 - List of Authors (Cao, S.V.)

Paper	Title	Page
WEPP06	Investigation of an Optical-Fiber Based Beam Loss Monitor at the J-PARC Extraction Neutrino Beamline	110
	S.V. Cao, M.L. Friend KEK, Ibaraki, Japan
	Optical fibers, which at once generate and guide Cherenkov light when charged particles pass through them, are widely used to monitor the beam loss at accelerator facilities. In this report, we investigate this application at the J-PARC extraction neutrino beamline, where a 30GeV proton beam with eight bunches of ~20ns (1σ) bunch width and 581ns bucket length, is extracted from the Main Ring, guided, and hit onto a graphite target to produce a highly intense beam of neutrinos. Three 30m-length 200um-core-diameter optical fibers, which are arranged flexibly to form 60m or 90m length fibers, were installed in the beamline. The beam loss signal was observed with the Muti-Pixel Photon Counters. We will discuss the result and prospects of using optical fibers for monitoring and locating the beam loss source.
	Poster WEPP06 [9.014 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-WEPP06
About •	paper received ※ 02 September 2020 paper accepted ※ 15 September 2020 issue date ※ 30 October 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPP34	First Beam Profile Measurements by Beam Induced Fluorescence at the J-PARC Neutrino Extraction Beamline	184
	M.L. Friend, S.V. Cao, K. Nakayoshi, K. Sakashita KEK, Ibaraki, Japan M. Hartz Kavli IPMU, Kashiwa, Japan Y. Koshio Okayama University, Faculty of Science, Okayama City, Japan A. Nakamura Okayama University, Okayama, Japan
	A Beam Induced Fluorescence (BIF) profile monitor is under development at the J-PARC neutrino extraction beamline, where neutrinos are produced using 30 GeV protons from the J-PARC MR accelerator. Towards the goal of continuously and non-destructively measuring the 1.3MW proton beam profile spill-by-spill using fluorescence from proton interactions with injected gas, a full working prototype monitor was installed in the beamline in 2019. The prototype includes a scheme for pulsed injection of N₂ gas into the ultra-high vacuum beampipe and two optical readout arms, a conventional one using an Image Intensifier coupled to a CID camera, along with an array of optical fibers coupled to a Multi-Pixel Photon Counter array. Initial beam tests of the system were carried out in early 2020, and BIF light was successfully observed in both optical systems. Details of the prototype monitor, along with first proton beam profile measurement results, will be shown. Improvement plans towards continuous operation of the new profile monitor will also be discussed.
	Poster WEPP34 [5.890 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-WEPP34
About •	paper received ※ 03 September 2020 paper accepted ※ 17 September 2020 issue date ※ 30 October 2020
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Investigation of an Optical-Fiber Based Beam Loss Monitor at the J-PARC Extraction Neutrino Beamline

110

S.V. Cao, M.L. Friend
KEK, Ibaraki, Japan

Optical fibers, which at once generate and guide Cherenkov light when charged particles pass through them, are widely used to monitor the beam loss at accelerator facilities. In this report, we investigate this application at the J-PARC extraction neutrino beamline, where a 30GeV proton beam with eight bunches of ~20ns (1σ) bunch width and 581ns bucket length, is extracted from the Main Ring, guided, and hit onto a graphite target to produce a highly intense beam of neutrinos. Three 30m-length 200um-core-diameter optical fibers, which are arranged flexibly to form 60m or 90m length fibers, were installed in the beamline. The beam loss signal was observed with the Muti-Pixel Photon Counters. We will discuss the result and prospects of using optical fibers for monitoring and locating the beam loss source.

Poster WEPP06 [9.014 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-WEPP06

About •

paper received ※ 02 September 2020 paper accepted ※ 15 September 2020 issue date ※ 30 October 2020

Export •

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

WEPP34

First Beam Profile Measurements by Beam Induced Fluorescence at the J-PARC Neutrino Extraction Beamline

184

M.L. Friend, S.V. Cao, K. Nakayoshi, K. Sakashita
KEK, Ibaraki, Japan
M. Hartz
Kavli IPMU, Kashiwa, Japan
Y. Koshio
Okayama University, Faculty of Science, Okayama City, Japan
A. Nakamura
Okayama University, Okayama, Japan

A Beam Induced Fluorescence (BIF) profile monitor is under development at the J-PARC neutrino extraction beamline, where neutrinos are produced using 30 GeV protons from the J-PARC MR accelerator. Towards the goal of continuously and non-destructively measuring the 1.3MW proton beam profile spill-by-spill using fluorescence from proton interactions with injected gas, a full working prototype monitor was installed in the beamline in 2019. The prototype includes a scheme for pulsed injection of N₂ gas into the ultra-high vacuum beampipe and two optical readout arms, a conventional one using an Image Intensifier coupled to a CID camera, along with an array of optical fibers coupled to a Multi-Pixel Photon Counter array. Initial beam tests of the system were carried out in early 2020, and BIF light was successfully observed in both optical systems. Details of the prototype monitor, along with first proton beam profile measurement results, will be shown. Improvement plans towards continuous operation of the new profile monitor will also be discussed.

Poster WEPP34 [5.890 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2020-WEPP34

About •

paper received ※ 03 September 2020 paper accepted ※ 17 September 2020 issue date ※ 30 October 2020

Export •

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