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A generalized fast feedback system has been developed to stabilize beams at various locations in the SLC. The system is designed to perform measurements and change actuator settings to control beam states such as position, angle and energy on a pulse to pulse basis. The software design is based on the state space formalism of digital control theory. The(More)
The BABAR detector, situated at the SLAC PEP-II asymmetric ee collider, has been recording data at energies on and around the Υ (4S) resonance since May 1999. In this paper, we briefly describe the PEP-II B Factory and the BABAR detector. The performance presently achieved by the experiment in the areas of tracking, vertexing, calorimetry and particle(More)
This paper describes preliminary results on the inclusive process b → sγ obtained from 20.7 fb of data recorded with the BABAR detector during 1999-2000. Signal event yields are found from a combination of twelve exclusive decay channels after subtracting continuum and BB backgrounds. Cross–feed from incorrectly reconstructed b → sγ events is also removed.(More)
A search for the exclusive radiative decays B → ρ(770)γ and B0 → ω(782)γ is performed on a sample of 84 million BB events collected by the BABAR detector at the PEP − II asymmetric e+e− collider. No significant signal is seen in any of the channels. We set preliminary upper limits of B[B0 → ρ0γ] < 1.4 × 10−6, B[B+ → ρ+γ] < 2.3 × 10−6 and B[B0 → ωγ] < 1.2 ×(More)
The SLAC Linear Collider now has a total of twentyfour beam-steering feedback loops used to keep the electron and positron beams on their desired trajectories. Seven of these loops measure and control the same beam as it proceeds down the linac through the arcs to the final focus. Ideally each loop should correct only for disturbances that occur between it(More)
one Pulse LowPaw The algorithms used in the database-driven SLC fastfeedback system are based on the state space formalism of digital control theory. These are implemented as a set of matrix equations which use a Kalman filter to estimate a vector of states from a vector of measurements, and then apply-a gain matrix to determine the actuator settings from(More)
A new feedback system has been developed that stabilizes the SLC beams at many locations. The feedback loops are designed to sample and correct at the repetition rate of the accelerator. Each loop can be distributed across several INTEL 80386 microprocessors that control the SLC hardware. ,4 new communications system, KISNET, has been developed to pass data(More)
M. C. Ross, L. Hendrickson, T. Himel, E. Miller Stanford Linear Accelerator Center Stanford, California 94309 Abstract A data acquisition method has been developed at the SLAC Linear Collider (SLC) that provides accurate beam parameter information using sub-tolerance xcitation and synchronized detection. This is being applied to several SLC sub-systems to(More)
Feedback systems are essential for stable operation of a linear collider, providing a cost-effective method for relaxing tight tolerances. In the Stanford Linear Collider (SLC), feedback controls beam parameters such as trajectory, energy, and intensity throughout the accelerator. A novel dithering optimization system which adjusts final focus parameters to(More)
A new feedback system has been developed for stabilizing the SLC beams at many locations. The feedback loops are desi ned rate oft % to sample and correct at the 60 Hz repetition e accelerator. Each loop can be distributed across several of the standard 80386 microprocessors which control the SLC hardware. A new communications system, KISNet, has been(More)