Orbit reconstruction, correction and monitoring in the ATF2 extraction line

The orbit in the ATF2 extraction line has to be accurately controlled to allow orbit and optics corrections to work well downstream. The Final Focus section contains points with large beta function values which amplify incoming beam jitter, and few correctors since the steering is performed using quadrupole movers, and so good orbit stability is required. First experience monitoring the orbit and measuring transfer matrices in the extraction line during the ATF2 commissioning is described, along with relative orbit reconstruction, allowing comparisons with simulations to identify sources of variations

Study of time-dependent corrections in the ATF2 beam-line

International audienceGoals of ATF2 will be to provide beams with a few tens of nanometers and stability at the nanometer level. To achieve this, ground motion should be measured and the effects of element displacement on the beam at the Interaction Point (IP) should be well understood. Feedback systems should also be simulated with a gound motion generator which includes spatial coherence for effects to be computed realistically

Description of a PLACET-compatible ground motion generator

Goals of ATF2 will be to provide nanometer size beams and sub-nanometer stability. To achieve it, simulations of feedback systems should be done based on realistic ground motion generators. A generator which produces output compatible with the PLACET simulations was developed with Matlab to reproduce the vibration spectra measured on the ATF floor at KEK. Spatial coherence between elements was also introduced in an approximate way. This generator is described here

Feedback Corrections for Ground Motion Effects at ATF2

accelconf.web.cern.ch/accelconf/e08/papers/tupc122.pdfInternational audienceGoals of ATF2 will be to provide beams with a few tens of nanometers and stability at the nanometer level. To achieve this, several corrections have to be applied as tra- jectory corrections and optics correction. Once the most critical effects are found, they must be canceled by trajec- tory correction and rematching of the optics quickly and efficiently. A method using SVD-determined knobs and how it can be implemented in ATF2 are here described

Linear collider test facility: ATF2 final focus active stabilisation pertinence

International audienceBeam motion at the Interaction Point (IP) of ATF2 has to be less than 10nm relative to the instrumentation used for measurements. Due to ground motion (GM), the beam can pass off-axis through the quadrupoles of the beam line and hence be deflected. It was shown in previous studies that good spatial coherence of the GM over a few meters makes the relative motion of the Final Doublets (FD) small enough for the tolerance not to be exceeded. However, since the coherence drops rapidly with distance, other quadrupoles further upstream can be expected to induce significant effects. In this paper, an evaluation taking into account all ATF2 quadrupoles is presented, using a GM generator with parameters tuned to dedicated measurements done recently along the ATF2 beam line and propagating to the IP with the optical transfer matrices. It was shown that although large IP beam motion can indeed be induced by some specific upstream quadrupoles, the combined effect of all is small because of compensations. The tolerance can thus be achieved without specially stabilising these quadrupoles

Insights into the clinical effectiveness of whitening products. Part 2 Dentist-supervised-at-home LED gel bleaching product

This section of the report is about the success of a dentist-supervised-at home LED gel tooth whitener, giving the results of a clinical study. The product (LED light gel with 44% carbamide peroxide) was applied by the dentist on teeth 11 and 21 in the chair for 10 minutes. The process was repeated three times, followed by an athome treatment period (30 minutes/day) of 14 days with 35% carbamide peroxide. The treatment was as outlined by the manufacturers. The L* value improved (more white) after the in-chair treatment with the LED system but showed no further significant increase after the 14 day at-home treatment. However, the b* value improved (less yellow), after both the LED treatment and 14 day athome treatment. The a* value did not improve significantly throughout the treatments. The LED system provides inchair tooth whitening after a 14 day treatment although not as effectively as does Opalescence

Recent Improvements in the Tracking Code Placet

The tracking code Placet has recently undergone several improvements. A redesign of its internal data structures and a new user interface based on the mathematical toolbox Octave considerably expanded its simulation capabilities. Several new lattice elements, optimization algorithms and physics processes were added to allow for more complete start-to-end simulations. Finally, the use of the AML language and the Universal Parser Library have extended its interfacing capability. A review of these new features is presented in this paper

Treating urinary tract infections in public sector primary healthcare facilities in Cape Town, South Africa: A pharmaceutical perspective

Antibiotic resistance is a global healthcare burden complicating the management of infections. Urinary tract infections (UTIs) are commonly treated in primary care. Managing UTIs appropriately in primary care can combat antibiotic resistance. The treatment practices for UTIs in primary care in Western Cape Province, South Africa, are not well described. To describe treatment of UTIs in adults in primary care in the Cape Town metropole public sector of the Western Cape. A retrospective multicentre medical records review of patients diagnosed with UTIs was conducted during 1 October 2020 - 28 February 2021. Six public sector primary healthcare facilities were included in the study through random selection from three of the four substructures in the Cape Town metropole. Medical records of adult patients diagnosed with UTIs, through clinical diagnosis or microbiological testing, were identified via a selective sampling process. Data were collected from medical records using a standardised data collection tool