Beam profile vs time Analyzed Vx vs Vy distributions vs time for –Run 72 (13:26:02 – 28:25) –Run 73 (13:36:10 – 13:37:30) –Run 74 (43:12 – 44:21) Binned.

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Presentation transcript:

Beam profile vs time Analyzed Vx vs Vy distributions vs time for –Run 72 (13:26:02 – 28:25) –Run 73 (13:36:10 – 13:37:30) –Run 74 (43:12 – 44:21) Binned distributions with the same Vernier scan location No Z vertex cuts Cut on Vr < 2 Rosi Reed 6/9/08

Gaussian Multiplication Beam is gaussian in shape Distribution of collisions in xy space is equal to the beam distributions multiplied by each other –Also gaussian in shape

Assuming the beams have the same width

Vernier Scan

Beam profile vs time Summary Calculated from Vx vs Vy distributions # Beam- Beam Events

Plots with less than 12 data points not included

Beam Sigmas calculated from formula on pg 3 Sigma X = 1.75 mm +/-.20 Sigma Y = 2.40 mm +/-.15 Error reflect statistical error only If our assumptions are correct, these distributions should be flat

Horizontal Vernier Scan Slope should be +/- 0.5 if our assumptions were correct

Vertical Vernier Scan Slope should be +/- 0.5 if our assumptions were correct

Some comments I noticed that as the good event rate went down, the ratio of good events to beam pipe events went down –I would like to quantify this next week No events with a vertex in Run 72 between 13:23:29 and 26:02 I have not looked at what happened in Run 73 between ~13:30 and 35 We conclude that the widths of the beams are –Sigma X = 1.75 mm +/-.20 –Sigma Y = 2.40 mm +/-.15