Development and Performance Test of the BPM System for the SPring-8 Upgrade

Maesaka, Hirokazu; Dewa, Hideki; Fujita, Takahiro; Masaki, Mitsuhiro; Takano, Shiro

doi:10.18429/JACoW-IPAC2017-MOPAB066

Joint Accelerator Conferences Website

The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.

RIS citation export for MOPAB066: Development and Performance Test of the BPM System for the SPring-8 Upgrade

TY - CONF
AU - Maesaka, H.
AU - Dewa, H.
AU - Fujita, T.
AU - Masaki, M.
AU - Takano, S.
ED - Schaa, Volker RW
ED - Arduini, Gianluigi
ED - Pranke, Juliana
ED - Seidel, Mike
ED - Lindroos, Mats
TI - Development and Performance Test of the BPM System for the SPring-8 Upgrade
J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017
C1 - Copenhagen, Denmark
T2 - International Particle Accelerator Conference
T3 - 8
LA - english
AB - We are developing a stable and precise BPM system for the low-emittance upgrade of SPring-8. One of the essential requirements for the BPM is the long term stabilization of the photon beam by regulating the electron beam orbit. Both the single-pass resolution of 100 um rms for an injected beam charge of 100 pC and an accuracy of 100 um rms are also crucial for beam commissioning. Drift sources of the present BPM system have been investigated extensively, such as humidity-dependent drifts coming from the radiation damage of coaxial cables, and the results are fed back to the design of the new BPM system. We have optimized the design of the button BPM electrodes to reconcile reduction of trapped-mode heating and maximization of the signal intensity. Stringent machining tolerance is imposed on a BPM head to align the BPM electric center accurately. A few kinds of the BPM head prototypes were produced and the machining accuracy, RF characteristics etc. were confirmed to be sufficient. We have installed one of the prototypes in the present storage ring to test the performance of the new BPM system under development, and have been obtaining successful results satisfying the requirements.
PB - JACoW
CP - Geneva, Switzerland
SP - 265
EP - 267
KW - radiation
KW - simulation
KW - storage-ring
KW - electron
KW - photon
DA - 2017/05
PY - 2017
SN - 978-3-95450-182-3
DO - 10.18429/JACoW-IPAC2017-MOPAB066
UR - http://jacow.org/ipac2017/papers/mopab066.pdf
ER -