The main objective of the ODAC is the beam quality, which is the measure of the “goodness” of a light source. This depends upon the reliability of the source (up time), the lifetime, the current and the beam stability (both orbit and collective effects). The machine is constantly monitored with two programs developed by the machine physics group (MacMon i.e. Machine monitoring and Bqc, i.e. beam quality controller) and the beam up time is continuously on display in the server elog accessible from anyone in the laboratory via a web browser. In general in 2013 a higher operational stability and up time / integrated intensity should be achieved.
Especially for 2013 the following objectives should be met:

Injectors: finalization and stabilization


Work will continue in 2015 on the pre-injector (spare gun electronics, SF6 circuit, stability measurements) and on the booster ring (instrumentation and radioprotection). The work on the SF6 circuit should finish in 2015 as well as the booster instrumentation. The project on the booster power converters started in 2011 with the scope to replace all electronics and power parts –second stage modules- and all modules should be reconstructed, finished successfully in 2014 and all booster big power supplies run on the new modules. The spare modulator of the pre-injecotr is constructed and tested and currently in use. The gun electronics should be refurbished and the 20 year old design will be upgraded. Work on temperature stabilization continues with the installation of temperature sensors.


The global orbit feedback should continue providing micron stability at the source point. Thermal stability is greatly improved with operations in top-up thus for 2015 the long term orbit stability should be of the order of ±5 micron at most whereas the short term stability will be at 2% of the beam dimensions provided that the ambient temperature will not oscillate by more than ±0.5 degrees from its set point. However since the airconditioning temperature control system does not work, during abrupt environment temperature changes we observe large oscillations of the order of ± 4 C that of course influences with the machine operations and stability. It is of very high importance that the temperature control system gets fixed.


Following the total re-alignment of the machine done in 2010, the beam based alignment (BBA) has been automatized during 2012 and can contribute in a fast and automatic way in minimising and making reproducible the electron orbit.  Orbit reproducibility in the bending magnet source points are about a factor 3-4 better than before (being before 40 um).  A new golden orbit has been defined that produces an absolute vertical global orbit of about 250 microns rms decreasing thus the geometric coupling from 1% down to 0.4% and therefore increasing the photon beam brilliance.
   New software has been developed to correct the optical asymmetries and thus not allowing the degradation of beam optics.


Last Updated on Tuesday, 24 February 2015 13:07