Top up operation

All available filling patterns (single and few bunch, multibuch and hybrid) are top-up compatible. New timing-bunch marker boards will be constructed for time resolved experiments in the beam line nanospectroscopy.


The Beam uptime should be more than 96% and this is the first KPI of the project
The definition of uptime% = 100- downtime%
The beam downtime is defined as the percentage of User Non usable beam time (No or bad beam excluding storms and other external factors) divided with the total user hours (minus 45 minutes for every programmed injection)
Downtime%= 100*(no or bad beam time-storms)/(user time - inj. time)
As always this requirement may be re-examined if big installations or modifications with unknown impact factor are completed and used by the machine for a period up to six month.
The second KPI is related to the top up operations. The system should stay in top-up for at least 88% of its user time.

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Beam current, lifetime, collective beam and orbit stability are defined basically in Elettra web page operating conditions:
http://www.elettra.eu/lightsources/elettra/elettra-main.html (excluding the usual conditioning/testing period for new installations).These quantities are continuously monitored with the above-mentioned programs and displayed on line in the server elog. Elettra can operate at higher currents up to 200 mA at 2.4 GeV (after the installation of the cooling fans on the hottest 24 bpms and the succesfull tests up to 200 mA at the end of 2012 and 360 mA at 2 GeV) and it was planned to increase the intensity of the 2.4 GeV operations from 150 to 175 mA however some beam lines can not get the thermal load as well as we have observed that some gaskets get damaged. However with intelligent use of the fans that stop when there is no beam current was possible to avoid gasket damage and hence vacuum problems. In 2015 an automatic system will modulate the speed of the fans according to the machine current intensity.

Last Updated on Tuesday, 24 February 2015 13:07