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Title: A transverse emittance and acceptance measurement system in a low-energy beam transport line

Abstract

A transverse beam emittance and acceptance measurement system has been developed to visualize the relationship between the injected beam emittance and the acceptance of a cyclotron. The system is composed of a steering magnet, two pairs of slits to limit the horizontal and vertical phase-space, a beam intensity detector just behind the slits for the emittance measurement, and a beam intensity detector in the cyclotron for the acceptance measurement. The emittance is obtained by scanning the slits and measuring the beam intensity distribution. The acceptance is obtained by measuring the distribution of relative beam transmission by injecting small emittance beams at various positions in a transverse phase-space using the slits. In the acceptance measurement, the beam from an ion source is deflected to the defined region by the slits using the steering magnet so that measurable acceptance area covers a region outside the injection beam emittance. Measurement tests were carried out under the condition of accelerating a beam of {sup 16}O{sup 6+} from 50.2 keV to 160 MeV. The emittance of the injected beam and the acceptance for accelerating and transporting the beam to the entrance of the extraction deflector were successfully measured. The relationship between the emittance and acceptancemore » is visualized by displaying the results in the same phase-plane.« less

Authors:
; ; ;  [1]
  1. Department of Advanced Radiation Technology, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292 (Japan)
Publication Date:
OSTI Identifier:
22253618
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 43 PARTICLE ACCELERATORS; BEAM EMITTANCE; BEAM INJECTION; BEAM TRANSPORT; CYCLOTRONS; ION BEAMS; KEV RANGE; MAGNETS; OXYGEN 16; PHASE SPACE

Citation Formats

Kashiwagi, H., E-mail: kashiwagi.hirotsugu@jaea.go.jp, Miyawaki, N., Kurashima, S., and Okumura, S.. A transverse emittance and acceptance measurement system in a low-energy beam transport line. United States: N. p., 2014. Web. doi:10.1063/1.4858175.
Kashiwagi, H., E-mail: kashiwagi.hirotsugu@jaea.go.jp, Miyawaki, N., Kurashima, S., & Okumura, S.. A transverse emittance and acceptance measurement system in a low-energy beam transport line. United States. doi:10.1063/1.4858175.
Kashiwagi, H., E-mail: kashiwagi.hirotsugu@jaea.go.jp, Miyawaki, N., Kurashima, S., and Okumura, S.. 2014. "A transverse emittance and acceptance measurement system in a low-energy beam transport line". United States. doi:10.1063/1.4858175.
@article{osti_22253618,
title = {A transverse emittance and acceptance measurement system in a low-energy beam transport line},
author = {Kashiwagi, H., E-mail: kashiwagi.hirotsugu@jaea.go.jp and Miyawaki, N. and Kurashima, S. and Okumura, S.},
abstractNote = {A transverse beam emittance and acceptance measurement system has been developed to visualize the relationship between the injected beam emittance and the acceptance of a cyclotron. The system is composed of a steering magnet, two pairs of slits to limit the horizontal and vertical phase-space, a beam intensity detector just behind the slits for the emittance measurement, and a beam intensity detector in the cyclotron for the acceptance measurement. The emittance is obtained by scanning the slits and measuring the beam intensity distribution. The acceptance is obtained by measuring the distribution of relative beam transmission by injecting small emittance beams at various positions in a transverse phase-space using the slits. In the acceptance measurement, the beam from an ion source is deflected to the defined region by the slits using the steering magnet so that measurable acceptance area covers a region outside the injection beam emittance. Measurement tests were carried out under the condition of accelerating a beam of {sup 16}O{sup 6+} from 50.2 keV to 160 MeV. The emittance of the injected beam and the acceptance for accelerating and transporting the beam to the entrance of the extraction deflector were successfully measured. The relationship between the emittance and acceptance is visualized by displaying the results in the same phase-plane.},
doi = {10.1063/1.4858175},
journal = {Review of Scientific Instruments},
number = 2,
volume = 85,
place = {United States},
year = 2014,
month = 2
}
  • A nonintrusive diagnostic device that will measure the transverse-phase-space parameters of an 800 MeV H{sup {minus}} beam is under development. The diagnostic device will make the measurements under normal operating conditions and will not perturb the particle beam or produce unwanted radiation. The diagnostic will use the phenomenon of laser-induced photodissociation to sample the H{sup {minus}} beam. This paper discusses the preliminary design of the diagnostic device. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
  • Accurate measurement of the beam phase-space is essential for the next generation of electron accelerators. A scheme for beam optics optimization and beam matrix reconstruction algorithms for the diagnostics section of the beam delivery system of the International Linear Collider based on laser-wire beam profile monitors are discussed. Possible modes of operation of the laser-wire system together with their corresponding performance are presented. Based on these results, prospects for reconstructing the ILC beam emittance from representative laser-wire beam size measurements are evaluated.
  • A nonintrusive diagnostic device that will measure the transverse-phase-space parameters of an 800 MeV H{sup {minus}} beam is under development. The diagnostic device will make the measurements under normal operating conditions and will not perturb the particle beam or produce unwanted radiation. The diagnostic will use the phenomenon of laser-induced photodissociation to sample the H{sup {minus}} beam. This paper discusses the preliminary design of the diagnostic device.
  • Transversal emittance measurements of intense low-energy beams involve use of collimators. As most of the beam is stopped by a collimator, a question arises whether the special conditions in the vicinity of the collimator influence emittance measurement. In particular, the secondary electrons emitted from the slit surface may affect the measurement of the beam phase distribution. We have observed significant modification in the measured phase space distribution of a 5–6 mA DC proton beam at the Soreq Applied Research Accelerator Facility low-energy transport after application of a weak magnetic field in the plane of the slit collimator. The periphery regionmore » of the phase distribution was mostly affected. The overall effect on the emittance value was as large as 20%.« less