ORIC beam energy increase

M. L. Mallory; J. B. Ball; D. T. Dowling; E. D. Hudson; R. S. Lord; B. A. Tatum

doi:10.1109/PAC.2005.1591075

ORIC beam energy increase

M. L. Mallory, J. B. Ball, D. T. Dowling, E. D. Hudson, R. S. Lord, B. A. Tatum

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The detection of and solution to a beam interference problem in the Oak Ridge Isochronous Cyclotron (ORIC) extraction system has yielded a 20% increase in the proton beam energy. The beam from ORIC was designed to be extracted before the v_r = 1 resonance. Most cyclotrons extract after the v _r = 1 resonance, thus getting more usage of the magnetic field for energy acceleration. Attempts to increase the ORIC extraction radius over the past 40 years have failed. We determined that the electrostatic deflector septum in ORIC interferes with the last accelerated orbit, with the highest extraction efficiency being obtained near the maximum v_r. This v_r provides a rotation in the betatron oscillation amplitude that is equal to the same length as the electrostatic septum thus allowing the beam to jump over an interference problem with the septum. With a thinned septum we were able to tune the beam to the v_r = 1 resonance and achieve a 20% increase in beam energy. However, the method of extraction with v_r > 1 may be useful for very high field cyclotrons since it provides greater clearance at extraction than that obtained from dee voltage gain, thus allowing the possibility of utilizing a magnetic extractor.

Original language	English
Title of host publication	Proceedings of the Particle Accelerator Conference, PAC 2005
Pages	2257-2259
Number of pages	3
DOIs	https://doi.org/10.1109/PAC.2005.1591075
State	Published - 2005
Event	Particle Accelerator Conference, PAC 2005 - Knoxville, TN, United States Duration: May 16 2005 → May 20 2005

Publication series

Name	Proceedings of the IEEE Particle Accelerator Conference
Volume	2005

Conference

Conference	Particle Accelerator Conference, PAC 2005
Country/Territory	United States
City	Knoxville, TN
Period	05/16/05 → 05/20/05

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10.1109/PAC.2005.1591075

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@inproceedings{802173da9cc346ff91107ef9d8cffe29,

title = "ORIC beam energy increase",

abstract = "The detection of and solution to a beam interference problem in the Oak Ridge Isochronous Cyclotron (ORIC) extraction system has yielded a 20% increase in the proton beam energy. The beam from ORIC was designed to be extracted before the vr = 1 resonance. Most cyclotrons extract after the v r = 1 resonance, thus getting more usage of the magnetic field for energy acceleration. Attempts to increase the ORIC extraction radius over the past 40 years have failed. We determined that the electrostatic deflector septum in ORIC interferes with the last accelerated orbit, with the highest extraction efficiency being obtained near the maximum vr. This vr provides a rotation in the betatron oscillation amplitude that is equal to the same length as the electrostatic septum thus allowing the beam to jump over an interference problem with the septum. With a thinned septum we were able to tune the beam to the vr = 1 resonance and achieve a 20% increase in beam energy. However, the method of extraction with vr > 1 may be useful for very high field cyclotrons since it provides greater clearance at extraction than that obtained from dee voltage gain, thus allowing the possibility of utilizing a magnetic extractor.",

author = "Mallory, {M. L.} and Ball, {J. B.} and Dowling, {D. T.} and Hudson, {E. D.} and Lord, {R. S.} and Tatum, {B. A.}",

year = "2005",

doi = "10.1109/PAC.2005.1591075",

language = "English",

isbn = "0780388593",

series = "Proceedings of the IEEE Particle Accelerator Conference",

pages = "2257--2259",

booktitle = "Proceedings of the Particle Accelerator Conference, PAC 2005",

note = "Particle Accelerator Conference, PAC 2005 ; Conference date: 16-05-2005 Through 20-05-2005",

}

Mallory, ML, Ball, JB, Dowling, DT, Hudson, ED, Lord, RS & Tatum, BA 2005, ORIC beam energy increase. in Proceedings of the Particle Accelerator Conference, PAC 2005., 1591075, Proceedings of the IEEE Particle Accelerator Conference, vol. 2005, pp. 2257-2259, Particle Accelerator Conference, PAC 2005, Knoxville, TN, United States, 05/16/05. https://doi.org/10.1109/PAC.2005.1591075

TY - GEN

T1 - ORIC beam energy increase

AU - Mallory, M. L.

AU - Ball, J. B.

AU - Dowling, D. T.

AU - Hudson, E. D.

AU - Lord, R. S.

AU - Tatum, B. A.

PY - 2005

Y1 - 2005

N2 - The detection of and solution to a beam interference problem in the Oak Ridge Isochronous Cyclotron (ORIC) extraction system has yielded a 20% increase in the proton beam energy. The beam from ORIC was designed to be extracted before the vr = 1 resonance. Most cyclotrons extract after the v r = 1 resonance, thus getting more usage of the magnetic field for energy acceleration. Attempts to increase the ORIC extraction radius over the past 40 years have failed. We determined that the electrostatic deflector septum in ORIC interferes with the last accelerated orbit, with the highest extraction efficiency being obtained near the maximum vr. This vr provides a rotation in the betatron oscillation amplitude that is equal to the same length as the electrostatic septum thus allowing the beam to jump over an interference problem with the septum. With a thinned septum we were able to tune the beam to the vr = 1 resonance and achieve a 20% increase in beam energy. However, the method of extraction with vr > 1 may be useful for very high field cyclotrons since it provides greater clearance at extraction than that obtained from dee voltage gain, thus allowing the possibility of utilizing a magnetic extractor.

AB - The detection of and solution to a beam interference problem in the Oak Ridge Isochronous Cyclotron (ORIC) extraction system has yielded a 20% increase in the proton beam energy. The beam from ORIC was designed to be extracted before the vr = 1 resonance. Most cyclotrons extract after the v r = 1 resonance, thus getting more usage of the magnetic field for energy acceleration. Attempts to increase the ORIC extraction radius over the past 40 years have failed. We determined that the electrostatic deflector septum in ORIC interferes with the last accelerated orbit, with the highest extraction efficiency being obtained near the maximum vr. This vr provides a rotation in the betatron oscillation amplitude that is equal to the same length as the electrostatic septum thus allowing the beam to jump over an interference problem with the septum. With a thinned septum we were able to tune the beam to the vr = 1 resonance and achieve a 20% increase in beam energy. However, the method of extraction with vr > 1 may be useful for very high field cyclotrons since it provides greater clearance at extraction than that obtained from dee voltage gain, thus allowing the possibility of utilizing a magnetic extractor.

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U2 - 10.1109/PAC.2005.1591075

DO - 10.1109/PAC.2005.1591075

M3 - Conference contribution

AN - SCOPUS:33847118619

SN - 0780388593

SN - 9780780388598

T3 - Proceedings of the IEEE Particle Accelerator Conference

SP - 2257

EP - 2259

BT - Proceedings of the Particle Accelerator Conference, PAC 2005

T2 - Particle Accelerator Conference, PAC 2005

Y2 - 16 May 2005 through 20 May 2005

ER -

ORIC beam energy increase

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