In the Compact Linear Collider (CLIC), it is planned to use an active micro-mover system in order to align the components of the main linac with an accuracy in the micrometre range. This active alignment system has already been successfully tested in CTF2 [1]. The effectiveness of such an alignment system is simulated for different hardware configurations and correction algorithms.
In the main linac of the Compact Linear Collider (CLIC), longitudinal and transverse dynamic imperfections, such as RF phase jitter, variation of bunch length and movements of elements, can result in significant luminosity loss. The responses of local trajectory feedbacks to these imperfections are studied in this paper.
Simulations for linear colliders are traditionally performed separately for the different sub-systems, like damping ring, bunch compressor, linac, and beam delivery. The beam properties are usually passed from one subsystem to the other via bunch charge, RMS transverse emittances, RMS bunch length, average energy and RMS energy spread. It is implicitly assumed that the detailed 6D correlations in the beam distribution are not relevant for the achievable luminosity. However, it has recently been shown that those correlations can have a strong effect on the beam-beam interaction. We present first results on CLIC [1] simulations that integrate linac, beam delivery, and beam-beam interaction. These integrated simulations also allow a better simulation of time-dependent effects, like ground perturbations and interference between several beam-based feedbacks.
We have searched for Theta+(1.54) -> K0,p decays using data from the 1999 run of the HyperCP experiment at Fermilab. We see no evidence for a narrow peak in the K0,p mass distribution near 1.54 GeV/c among 106,000 K0,p candidates, and obtain an upper limit for the fraction of Theta+(1.54) to K0,p candidates of <0.25% at 90% confidence.
Using data collected with the HyperCP (E871) spectrometer during the 1997 fixed-target run at Fermilab, we report the first observation of the decay K--->pi(-)mu(+)mu(-) and new measurements of the branching ratios for K+/--->pi(+/-)mu(+)mu(-). By combining the branching ratios for the decays K+-->pi(+)mu(+)mu(-) and K--->pi(-)mu(+)mu(-), we measure Gamma(K+/--->pi(+/-)mu(+)mu(-))/Gamma(K+/--->all) = (9.8+/-1.0+/-0.5)x10(-8). The CP asymmetry between the rates of the two decay modes is [Gamma(K+-->pi(+)mu(+)mu(-))-Gamma(K--->pi(-)mu(+)mu(-))]/[Gamma(K+-->pi(+)mu(+)mu(-))+Gamma(K--->pi(-)mu(+)mu(-))] = -0.02+/-0.11+/-0.04.
We have searched for ${\ensuremath{\theta}}^{+}(1.54)\ensuremath{\rightarrow}{K}^{0}p$ decays using data from the 1999 run of the HyperCP experiment at Fermilab. We see no evidence for a narrow peak in the ${K}_{S}^{0}p$ mass distribution near $1.54\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/c$ among 106 000 ${K}_{S}^{0}p$ candidates, and obtain an upper limit for the fraction of ${\ensuremath{\theta}}^{+}(1.54)$ to ${K}_{S}^{0}p$ candidates of $<0.3%$ at 90% confidence.
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