Measurement of electron trapping in the Cornell Electron Storage Ring
The buildup of low-energy electrons has been shown to affect the performance of a wide variety of particle accelerators. Of particular concern is the persistence of the cloud between beam bunch passages, which can impose limitations on the stability of operation at high beam current. We have obtaine...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2015-04-01
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| Series: | Physical Review Special Topics. Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevSTAB.18.041001 |
| _version_ | 1818309460887601152 |
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| author | M. G. Billing J. Conway E. E. Cowan J. A. Crittenden W. Hartung J. Lanzoni Y. Li C. S. Shill J. P. Sikora K. G. Sonnad |
| author_facet | M. G. Billing J. Conway E. E. Cowan J. A. Crittenden W. Hartung J. Lanzoni Y. Li C. S. Shill J. P. Sikora K. G. Sonnad |
| author_sort | M. G. Billing |
| collection | DOAJ |
| description | The buildup of low-energy electrons has been shown to affect the performance of a wide variety of particle accelerators. Of particular concern is the persistence of the cloud between beam bunch passages, which can impose limitations on the stability of operation at high beam current. We have obtained measurements of long-lived electron clouds trapped in the field of a quadrupole magnet in a positron storage ring, with lifetimes much longer than the revolution period. Based on modeling, we estimate that about 7% of the electrons in the cloud generated by a 20-bunch train of 5.3 GeV positrons with 16-ns spacing and 1.3×10^{11} population survive longer than 2.3 μs in a quadrupole field of gradient 7.4 T/m. We have observed a nonmonotonic dependence of the trapping effect on the bunch spacing. The effect of a witness bunch on the measured signal provides direct evidence for the existence of trapped electrons. The witness bunch is also observed to clear the cloud, demonstrating its effectiveness as a mitigation technique. |
| first_indexed | 2024-12-13T07:30:32Z |
| format | Article |
| id | doaj.art-82b8ffbe72a5477a9c0e2cd3bfe5f13f |
| institution | Directory Open Access Journal |
| issn | 1098-4402 |
| language | English |
| last_indexed | 2024-12-13T07:30:32Z |
| publishDate | 2015-04-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Special Topics. Accelerators and Beams |
| spelling | doaj.art-82b8ffbe72a5477a9c0e2cd3bfe5f13f2022-12-21T23:55:12ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022015-04-0118404100110.1103/PhysRevSTAB.18.041001Measurement of electron trapping in the Cornell Electron Storage RingM. G. BillingJ. ConwayE. E. CowanJ. A. CrittendenW. HartungJ. LanzoniY. LiC. S. ShillJ. P. SikoraK. G. SonnadThe buildup of low-energy electrons has been shown to affect the performance of a wide variety of particle accelerators. Of particular concern is the persistence of the cloud between beam bunch passages, which can impose limitations on the stability of operation at high beam current. We have obtained measurements of long-lived electron clouds trapped in the field of a quadrupole magnet in a positron storage ring, with lifetimes much longer than the revolution period. Based on modeling, we estimate that about 7% of the electrons in the cloud generated by a 20-bunch train of 5.3 GeV positrons with 16-ns spacing and 1.3×10^{11} population survive longer than 2.3 μs in a quadrupole field of gradient 7.4 T/m. We have observed a nonmonotonic dependence of the trapping effect on the bunch spacing. The effect of a witness bunch on the measured signal provides direct evidence for the existence of trapped electrons. The witness bunch is also observed to clear the cloud, demonstrating its effectiveness as a mitigation technique.http://doi.org/10.1103/PhysRevSTAB.18.041001 |
| spellingShingle | M. G. Billing J. Conway E. E. Cowan J. A. Crittenden W. Hartung J. Lanzoni Y. Li C. S. Shill J. P. Sikora K. G. Sonnad Measurement of electron trapping in the Cornell Electron Storage Ring Physical Review Special Topics. Accelerators and Beams |
| title | Measurement of electron trapping in the Cornell Electron Storage Ring |
| title_full | Measurement of electron trapping in the Cornell Electron Storage Ring |
| title_fullStr | Measurement of electron trapping in the Cornell Electron Storage Ring |
| title_full_unstemmed | Measurement of electron trapping in the Cornell Electron Storage Ring |
| title_short | Measurement of electron trapping in the Cornell Electron Storage Ring |
| title_sort | measurement of electron trapping in the cornell electron storage ring |
| url | http://doi.org/10.1103/PhysRevSTAB.18.041001 |
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