Comparison of the Coupling of Dipole Motion From Bunch to Bunch in an Electron Beam Caused by Electron Clouds at CesrTA Due to Variations in Bunch Length and Chromaticity

Billing, Michael; Bartnik, Laurel; Crittenden, James; Forster, Michael; Holtzapple, Robert; Rider, Nate; Runburg, Elliott; Shanks, James; Spiegel, Michael; Wang, Suntao

doi:10.18429/JACoW-IPAC2017-THPVA034

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RIS citation export for THPVA034: Comparison of the Coupling of Dipole Motion From Bunch to Bunch in an Electron Beam Caused by Electron Clouds at CesrTA Due to Variations in Bunch Length and Chromaticity

TY - CONF
AU - Billing, M.G.
AU - Bartnik, L.Y.
AU - Crittenden, J.A.
AU - Forster, M.J.
AU - Holtzapple, R.
AU - Rider, N.T.
AU - Runburg, E.C.
AU - Shanks, J.P.
AU - Spiegel, M.B.
AU - Wang, S.
ED - Schaa, Volker RW
ED - Arduini, Gianluigi
ED - Pranke, Juliana
ED - Seidel, Mike
ED - Lindroos, Mats
TI - Comparison of the Coupling of Dipole Motion From Bunch to Bunch in an Electron Beam Caused by Electron Clouds at CesrTA Due to Variations in Bunch Length and Chromaticity
J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017
C1 - Copenhagen, Denmark
T2 - International Particle Accelerator Conference
T3 - 8
LA - english
AB - Earlier experiments at the Cornell Electron-Positron Storage Ring Test Accelerator (CesrTA) have probed the interaction of the electron cloud (EC) with a 2.1 GeV stored positron beam. Since a very low EC density is expected with the electron bunches, these results characterize the dependence of beam-vacuum chamber impedance interactions, which are common to both positron and electron beams. The experiments were performed on a 30-bunch electron train with a 14 ns spacing, at a fixed current of 0.75mA/bunch, at two different vertical chromaticity settings and for four different bunch lengths (or synchrotron tunes.) The beam dynamics of the stored beam, in the presence of the electron cloud, was quantified using: 20 turn-by-turn beam position monitors in CESR to measure the correlated bunch-by-bunch dipole motion and an x-ray beam size monitor to record the bunch-by-bunch, turn-by-turn vertical size of each bunch within the trains. In this paper we report on the analysis of the observations from these experiments and compare them with effects of the EC on the positron beam's dipole motion and coupling of the motion from each bunch to its succeeding bunches.
PB - JACoW
CP - Geneva, Switzerland
SP - 4509
EP - 4511
KW - electron
KW - damping
KW - positron
KW - dipole
KW - coupling
DA - 2017/05
PY - 2017
SN - 978-3-95450-182-3
DO - 10.18429/JACoW-IPAC2017-THPVA034
UR - http://jacow.org/ipac2017/papers/thpva034.pdf
ER -