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RIS citation export for THPP25: Measurements of Ion Instability and Emittance Growth for the APS-Upgrade

TY  - CONF
AU  - Calvey, J.R.
AU  - Borland, M.
AU  - Clute, T.K.
AU  - Dooling, J.C.
AU  - Emery, L.
AU  - Gagliano, J.
AU  - Hoyt, J.E.
AU  - Kallakuri, P.S.
AU  - Morrison, L.H.
AU  - Wienands, U.
ED  - Tavares, Daniel
ED  - Picoreti, Renan
ED  - Bruno, Gustavo
ED  - Marques, Sergio
ED  - Schaa, Volker R.W.
TI  - Measurements of Ion Instability and Emittance Growth for the APS-Upgrade
J2  - Proc. of IBIC2020, Santos, Brazil, 14-18 September 2020
CY  - Santos, Brazil
T2  - International Beam Instrumentation Conference
T3  - 9
LA  - english
AB  - Ions are produced in an accelerator when the beam ionizes residual gas inside the vacuum chamber. If the beam is negatively charged, ions can become trapped in the beam’s potential, and their density will increase over time. Trapped ions can cause a variety of undesirable effects, including instability and emittance growth. Because of the challenging emittance and stability requirements of the APS-Upgrade storage ring, ion trapping is a serious concern. To study this effect at the present APS, a gas injection system was installed. A controlled pressure bump of Nitrogen gas was created over a 6m straight section, and the resulting ion instability was studied using several different detectors. Measurements were taken using a pinhole camera, spectrum analyzer, bunch-by-bunch feedback system, and a gas bremsstrahlung detector. Studies were done under a wide variety of beam conditions, and at different pressure bump amplitudes. In this paper we report on the results of some of these measurements, and discuss the implications for present and future electron storage rings.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 258
EP  - 262
KW  - emittance
KW  - detector
KW  - injection
KW  - photon
KW  - storage-ring
DA  - 2020/10
PY  - 2020
SN  - 2673-5350
SN  - 978-3-95450-222-6
DO  - doi:10.18429/JACoW-IBIC2020-THPP25
UR  - https://www.jacow.org/ibic2020/papers/thpp25.pdf
ER  -