Single bunch longitudinal measurements at the Cornell Electron-Positron Storage Ring

Holtzapple, R.; Billing, M.; Hartill, D. L.; Stedinger, M.G.; Podobedov, B.

doi:10.1103/physrevstab.3.034401

Cited by 15 publications

(29 citation statements)

References 6 publications

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“…We used a streak speed of 1ns/15mm for these measurements. The streak camera and experimental set-up for these measurements are similar to previous measurements [2]. In addition to using a different camera, a periscope has been removed from the streak camera optics and a new diamond turned copper mirror is used as a primary mirror for the SRF cavity measurements.…”

Section: Introductionmentioning

confidence: 72%

“…These distributions, like the ones displayed in figure 5, can be used to extract the vacuum chamber impedance of CESR. The growth rate of the asymmetry factor with the SRF cavities is -0.0042AF/mA and with the NRF cavities it was -0.0062AF/mA [2] indicating a reduction in the resistive part of the vacuum chamber impedance with the SRF cavities.…”

Section: Ii) Bunch Length As a Function Of Currentmentioning

confidence: 95%

“…where 2 I , 3 I and 4 I are the synchrotron radiation integrals. The term is the momentum V rf 6.70 MV Table 2.…”

Section: Cesr Single Bunch Dynamicsmentioning

confidence: 99%

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Single bunch longitudinal measurements of the Cornell Electron-Positron Storage Ring with the superconducting RF cavities

Holtzapple

Rice²

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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As part of the Phase III luminosity upgrade, the Cornell Electron-Positron Storage Ring (CESR) RF system has been upgraded from normal conducting (NRF) to superconducting (SRF) cavaties. The new superconducting cavities change the overall impedance of CESR and thus change the longitudinal bunch distribution. Measurements of the single bunch longitudinal distribution have been made using a streak camera on CESR with the SRF cavities present. These measurements are compared with earlier measurements on CESR with the NRF cavities. The CESR vacuum chamber impedance is determined from the current dependence of the single bunch charge distribution.

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Section: Introductionmentioning

confidence: 72%

Section: Ii) Bunch Length As a Function Of Currentmentioning

confidence: 95%

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Single bunch longitudinal measurements of the Cornell Electron-Positron Storage Ring with the superconducting RF cavities

Holtzapple

Rice²

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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“…A description of the camera and experimental set-up is described in detail elesewhere [2]. To determine the bunch length, the longitudinal profiles of the beam distribution are fit to an asymmetric Gaussian function with a constant background given by…”

Section: Discussionmentioning

confidence: 99%

“…. mm [2]. 3) With the bunch spacing of 42 ns between bunches, the longitudinal instability was not present.…”

Section: Stable Bunch Measurmentsmentioning

confidence: 99%

Streak camera measurements of the longitudinal distribution with multiple bunches in CESR

Holtzapple

Billing²,

Hartill³

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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The Cornell Electron-Positron Storage Ring (CESR) has a longitudinal dipole-coupled-bunch instability that limits the total amount of current that can be stored in the ring. As a result, it is one of the major limitations for higher luminosity [1]. This paper reports the results from a streak camera used to measure the dependence of the bunch's distribution on current and accelerating RF voltage for multiple bunches in CESR, as well as the effects of the longitudinal instability on the bunch distribution. Measurements of the bunch's longitudinal distribution at CESR, with multiple bunches present in the ring, help give an understanding of the nature of the longitudinal instability.

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Visible-light beam size monitors using synchrotron radiation at CESR

Wang

Rubin

Conway

et al. 2013

Nuclear Instruments and Methods in Physics Research Section A:

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A beam profile monitor utilizing visible synchrotron radiation (SR) from a bending magnet has been designed and installed in Cornell Electron-Positron Storage Ring (CESR). The monitor employs a double-slit interferometer to measure both the horizontal and vertical beam sizes over a wide range of beam currents. By varying the separation of the slits, beam sizes ranging from 50 to 500 um can be measured with a resolution of approximately 5 um. To measure larger beam size (> 500 um), direct imaging can be employed by rotating the double slits away from SR beam path. By imaging the pi-polarized component of SR, a small vertical beam size (~70 um) was measured during an undulator test run in CESR, which was consistent with the interferometer measurement. To measure the bunch length, a beam splitter is inserted to direct a fraction of light into a streak camera setup. This beam size monitor measures the transverse and longitudinal beam sizes simultaneously, which is successfully used for intrabeam scattering studies. Detailed error analysis is discussed.Comment: 26 pages, 13 figure

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Single bunch longitudinal measurements at the Cornell Electron-Positron Storage Ring

Cited by 15 publications

References 6 publications

Single bunch longitudinal measurements of the Cornell Electron-Positron Storage Ring with the superconducting RF cavities

Single bunch longitudinal measurements of the Cornell Electron-Positron Storage Ring with the superconducting RF cavities

Streak camera measurements of the longitudinal distribution with multiple bunches in CESR

Visible-light beam size monitors using synchrotron radiation at CESR

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