Measurement of Proton Transverse Emittance in the Brookhaven AGS

Huang, Haixin; Ahrens, Leif; Dawson, Craig; Harper, Caitlin; Liu, Chuyu; Méot, Francois; Minty, Michiko; Schoefer, Vincent; Tepikian, Steven; Zeno, Keith

doi:10.18429/JACoW-IPAC2017-MOPAB154

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RIS citation export for MOPAB154: Measurement of Proton Transverse Emittance in the Brookhaven AGS

TY - CONF
AU - Huang, H.
AU - Ahrens, L.
AU - Dawson, C.W.
AU - Harper, C.E.
AU - Liu, C.
AU - Minty, M.G.
AU - Méot, F.
AU - Schoefer, V.
AU - Tepikian, S.
AU - Zeno, K.
ED - Schaa, Volker RW
ED - Arduini, Gianluigi
ED - Pranke, Juliana
ED - Seidel, Mike
ED - Lindroos, Mats
TI - Measurement of Proton Transverse Emittance in the Brookhaven AGS
J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017
C1 - Copenhagen, Denmark
T2 - International Particle Accelerator Conference
T3 - 8
LA - english
AB - High luminosity and high polarization in RHIC require good control and measurement of emittance in its injector, the Brookhaven AGS. In the past, the AGS emittance has been measured by using an ion collecting IPM during the whole cycle. The beam profiles from this IPM are distorted by space charge forces at higher energy, which makes the emittance determination very hard. The effect has been measured with IPM measurement at different energies with RF off to mitigate the space charge effect. In addition, helical snake magnets and near integer vertical tune for polarized proton operation distort the lattice in the AGS and introduce large beta beating. For more precise measurements of the emittance, we need turn-by-turn (TBT) measurements near injection and beta function measurements at the IPM. The AGS has also been modeled to get the beta functions at the locations of IPM. A new type of electron collecting IPM has been installed and tested in the AGS with proton beam. The vertical beta functions at the IPM locations have been measured with a local corrector near the IPM. This paper summarizes our current understanding of AGS emittances and plans for the further improvements.
PB - JACoW
CP - Geneva, Switzerland
SP - 494
EP - 496
KW - emittance
KW - dipole
KW - injection
KW - flattop
KW - proton
DA - 2017/05
PY - 2017
SN - 978-3-95450-182-3
DO - 10.18429/JACoW-IPAC2017-MOPAB154
UR - http://jacow.org/ipac2017/papers/mopab154.pdf
ER -