MERIT beam optics I.Efthymiopoulos – CERN, AB Dept. MERIT, VRVS Meeting July 16, 2008.

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Presentation transcript:

MERIT beam optics I.Efthymiopoulos – CERN, AB Dept. MERIT, VRVS Meeting July 16, 2008

September 11, 2007I.Efthymiopoulos - CERN2 MERIT Elements – Layout QFO.415s (focusing) quads 3 elements in series QDE.430s (de-focusing) quads 3 elements in series

Survey data after the MERIT run – September 11, 2007I.Efthymiopoulos - CERN3 Upstream face: -72.3cm

Beam optics Fit parameters: QFO, QDO strengths and locations (within limits) September 11, 2007I.Efthymiopoulos - CERN4

Beam envelope (1-sigma) -  =0.25 (mm.mrad), Dp=0.1% September 11, 2007I.Efthymiopoulos - CERN5 Without dispersion term With dispersion term  x) = 2.2mm,  y) = 0.86 mm, 164

Beam optics – summary Optics solution found within the overall constrains Lack of survey before the data-taken introduced an error to the beam focus position Beam waist advanced by ~1m upstream of solenoid Beam spot estimate depends on emittance measurement We did not insist of having systematic measurement of the beam emittance during the run Only five measurements done September 11, 2007I.Efthymiopoulos - CERN6

June 3, 2015I. Efthymiopoulos - CERNMERIT - VRVS Meeting - 7 Beam Emittance measurement – 14 GeV/c Friday Beam intensity: h16, 1E13

June 3, 2015I. Efthymiopoulos - CERNMERIT - VRVS Meeting - 8 Beam Emittance measurement – 14 GeV/c Friday Beam intensity: 2.5E11/bunch 2 extracted bunches, DT=1.7us

June 3, 2015I. Efthymiopoulos - CERNMERIT - VRVS Meeting - 9 Beam Emittance measurement – 14 GeV/c Friday Beam intensity: 1.3E12/bunch 2 extracted bunches, DT=1.7us

June 3, 2015I. Efthymiopoulos - CERNMERIT - VRVS Meeting - 10 Beam Emittance measurement – 24 GeV/c Friday Beam intensity: 2.5E11/bunch 16 bunches

June 3, 2015I. Efthymiopoulos - CERNMERIT - VRVS Meeting - 11 Beam Emittance measurement – 24 GeV/c Friday Beam intensity: 16 bunches, 6E12 protons

Emittance measurement Use the data to extrapolate at higher intensities September 11, 2007I.Efthymiopoulos - CERN12

Estimated beam spot and density Use the extrapolated emittances to estimate the beam spot and energy density at target Example : 24 GeV, 30 TP September 11, 2007I.Efthymiopoulos - CERN13