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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 on theme: "MERIT beam spot from optics (update of July 16,2008 talk) I.Efthymiopoulos – CERN, AB Dept. MERIT, VRVS Meeting September 25, 2008."— Presentation transcript:

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

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

3 Survey data after the MERIT run – 18.12.2007 September 25, 2008 Upstream face: -72.3cm 3

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

5 Beam envelope (1-sigma) -  =0.25 (mm.mrad), Dp=0.1% September 25, 2008 Without dispersion term  x) = 1.2mm,  y) = 1.1 mm 238 J/gr @ 30TP With dispersion term  x) = 2.2mm,  y) = 1.1 mm 130 J/gr @ 30TP 5

6 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] (  ) 14.014.92 24.025.58 Including dispersion What is measured in the machine: 6

7 September 25, 2008 Beam Emittance measurement – 14 GeV/c Friday 26.10@15:55 Beam intensity: h16, 1E13 7

8 September 25, 2008 Beam Emittance measurement – 14 GeV/c Friday 26.10@17:37 Beam intensity: 2.5E11/bunch 2 extracted bunches, DT=1.7us 8

9 September 25, 2008 Beam Emittance measurement – 14 GeV/c Friday 26.10@18:24 Beam intensity: 1.3E12/bunch 2 extracted bunches, DT=1.7us 9

10 September 25, 2008 Beam Emittance measurement – 24 GeV/c Friday 02.11@14:55PM Beam intensity: 2.5E11/bunch 16 bunches 10

11 September 25, 2008 Beam Emittance measurement – 24 GeV/c Friday 02.11@16:02PM Beam intensity: 16 bunches, 6E12 protons 11

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

13 Emittance extrapolation September 25, 200813

14 Estimated beam spot and density Use the extrapolated emittances to estimate the beam spot and energy density at target September 25, 200814

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