Beam dashboard explanations

This page explains the various status which can be found in the operation dashboard. The pictures below are not the "real time" ones, they are jsute examples of the different values of each field.

>>Click here for the present status of the beam.

 

Beamlines

The beamlines are listed in boxes whose color indicate their status:

• Grey : the beamline is under construction, or there is no beamline at this position in the storage ring
• Green : the beamline takes beam
• White : the beamline does not take beam
• Yellow : the beamline cannot take beam because there is a problem
• Pink : Front-end of the beamline is closed and locked (the beamline cannot take beam)
• Blue : for 2 beamlines only, ANATOMIX and NANOSCOPIUM, which share their front end and first hutch. When the beamline is blue, it does not take the beam whereas its neighbor does (this one is therefore green).
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Graph

The graph shows the intensity of the electron beam in the storage ring as a function of time (in hours). The value in mA (miliamperes) is shown in real time in a blue box, on top left of the dashboard. 

The filling color below the curve indicates whether:

• Yellow: the beam is not delivered to the beamlines, it is used for Machine studies, such as optimisations, settings or research. It is a Machine Run.
• Green: the beam is delivered to the beamlines
• Blue: the beam is used for radioprotection controls on one or several beamlines.
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Meanings of the different values:

Function mode

This field indicates the electron beam injection mode in the storage ring

• TOP-UP: Regular injections of electrons every few minutes to maintain the beam intesity within +/- 0,5 %
• INJECTION: Injection from zero intensity (takes a few minutes) 
• DELIVERY: No injection
• MACHINE: Set-up phase

Filling mode

This field indicates the number of electron bunches in the storage ring (maximum 416), and how they are distributed:

• 4/4 mode: electrons are distributed in 4 groups of 100 bunches 
• 8-bunch mode: 8 bunches of electrons, regularly spaced, are circulating in the storage ring.
• 1-bunch mode: 1 bunch of electrons is circulating in the storage ring 
• Hybrid mode: 301 bunches of electrons are circulating in the storage ring, among which 300 fill 3/4 of the ring and 1 is isolated in the middle of the remaining 1/4.

End of Beam

This field indicates the date and time of the next "end of avalaibility of the beam for the beamlines". It also shows the remaining time before this moment as a countdown.

Delivery since

This field indicates when the beam was made available for the beamlines.

Next User Beam

This field indicates, during Machine Runs, when the beam is made available for the beamlines.

Lifetime

Lifetime of the beam if there is no injection of "new" electrons. This lifetime, in hours, is the time needed for the intensity to naturally decrease down to 37% of the present value (exponential decay).

Integrated dose

Cumulated quantity of current (integral, given in Ampère.hour) since the beginning of SOLEIL.

Average Pressure

Mean value of the gas pressure in the vacuum chambers where the electrons are circulating.

Orbit (RMS) et Orbit (Peak)

Variations (standard deviation and peak) of the position of the beam with respect to the theoretical axis of the storage ring, in the horizontal (H) and vertical (V) planes. These values (in micrometers) are good indicators of the stability of the beam.

Emittance

Product of the the size by the divergence of the electron beam. The horizontal emittance is given in nm.rad (10^-9 m.rad) and the verical one, ~100 times smaller, is given in pm.rad (10^-12 m.rad). These values are representative of the beam horizontal and vertical sizes respectively.

Tune

Wavenumber related to the focalisation settings in the horizontal and vertical planes.