MERIT beam spot from optics (update of July 16,2008 talk) I.Efthymiopoulos – CERN, AB Dept. MERIT, VRVS Meeting September 25, 2008.

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Presentation transcript:

MERIT beam spot from optics (update of July 16,2008 talk) I.Efthymiopoulos – CERN, AB Dept. MERIT, VRVS Meeting September 25, 2008

MERIT Elements – Layout QFO.415s (focusing) quads 3 elements in series QDE.430s (de-focusing) quads 3 elements in series 2

Survey data after the MERIT run – September 25, 2008 Upstream face: -72.3cm 3

Beam optics Fit parameters: QFO, QDO strengths and locations (within limits) September 25, 20084

Beam envelope (1-sigma) -  =0.25 (mm.mrad), Dp=0.1% September 25, 2008 Without dispersion term  x) = 1.2mm,  y) = 1.1 mm TP With dispersion term  x) = 2.2mm,  y) = 1.1 mm TP 5

September 25, 2008 Reminder – Beam Emittance For proton machines, the emittance is measured by measuring the beam profile in a position of known beam parameters (optics) The convention is to use TWO sigma value  2  Emittance (87% of beam) Geometrical emittance:Normalized emittance: P [GeV/c] (  ) Including dispersion What is measured in the machine: 6

September 25, 2008 Beam Emittance measurement – 14 GeV/c Friday Beam intensity: h16, 1E13 7

September 25, 2008 Beam Emittance measurement – 14 GeV/c Friday Beam intensity: 2.5E11/bunch 2 extracted bunches, DT=1.7us 8

September 25, 2008 Beam Emittance measurement – 14 GeV/c Friday Beam intensity: 1.3E12/bunch 2 extracted bunches, DT=1.7us 9

September 25, 2008 Beam Emittance measurement – 24 GeV/c Friday Beam intensity: 2.5E11/bunch 16 bunches 10

September 25, 2008 Beam Emittance measurement – 24 GeV/c Friday Beam intensity: 16 bunches, 6E12 protons 11

Beam Emittance measurement Summary of measured data September 25, 2008 Using the formulas of slide #6 in good agreement with the online calculations 12

Emittance extrapolation September 25,

Estimated beam spot and density Use the extrapolated emittances to estimate the beam spot and energy density at target September 25,