Where can I see the injection emittance?
Where can I see the injection emittance?
Where can I see the injection emittance for a fill?
Re: Where can I see the injection emittance?
Some “emittance” information is displayed on the “Wire Scan Application” snapshot that is frequently posted in the “Operations Log”. Access to the “Operations Log” requires a CERN Log On Id.
Re: Where can I see the injection emittance?
You can also work out the emittance from the beam size, if you know the beta (Twiss beta) at the point where the beam size is measured. Beam size = sqrt(beta * emmittance).
On the LHC dashboard, I think that the blue lines on the 'beam size' graph correspond to the BSRT synchrotron-light camera. In this case the beta (measured in metres) would be:
450 GeV BETX BETY
B1 162.5 174.0
B2 130.1 417.6
3500 GeV BETX BETY
B1 173.0 194.8
B2 130.0 371.7
I have no idea what the red lines show, does anyone know?
On the LHC dashboard, I think that the blue lines on the 'beam size' graph correspond to the BSRT synchrotron-light camera. In this case the beta (measured in metres) would be:
450 GeV BETX BETY
B1 162.5 174.0
B2 130.1 417.6
3500 GeV BETX BETY
B1 173.0 194.8
B2 130.0 371.7
I have no idea what the red lines show, does anyone know?
Re: Where can I see the injection emittance?
Blue solid = B1 horizontaladam_jeff wrote:I have no idea what the red lines show, does anyone know?
Blue dotted = B1 vertical
Red solid = B2 horizontal
Red dotted = B2 vertical
Re: Where can I see the injection emittance?
Oh yes, kind of obvious. D'oh!