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e+/e- Vertical Beam Size during CESR-c Collisions

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Presentation on theme: "e+/e- Vertical Beam Size during CESR-c Collisions"— Presentation transcript:

1 e+/e- Vertical Beam Size during CESR-c Collisions
E. Tanke, R. Holtzapple Data taken 8/1/2006

2 e+ Average Vertical Beam Size:
Parasitic measurements made during CESR-c colliding beams. The vertical distribution is averaged over 100 turns (10,000 turn total). Fit each PMT profile to a Gaussian distribution to determine the sv(15.6 pixels/mm calibration). Two separate data sets taken. Typical 100 turn average e+ distribution. Note: Fit values shown here are in pixels not mm here

3 Average sv for two data sets.
100 turn pulse to pulse sv. e+ vertical beam size decreases along each train (except for train 3)!

4 Mean position of vertical distribution for each train.
e+ vertical position increases along each train. Correlation between sv and mean position of the vertical distribution.

5 Single bunch current Slight correlation between beam size and current

6 e+ Single Turn Vertical Beam Size:
Single turn vertical distribution for 500 turns. Typical single turn distribution Vertical beam size for bunch 1 over 500 turns Average single turn sv-Vertical beam size decreases along the train!

7 Single turn mean position along the trains
Single bunch mean position for bunch 1.

8 e- Average Vertical Beam Size::
The vertical distribution is averaged over 100 turns (10,000 turn total). Fit each distribution to Gaussian to determine the vertical beam size (5.5 pixels/mm calibration) Vertical beam size growth along each train (except for train 1)! Average sv. Typical distribution 100 turn pulse to pulse sv.

9 Current/bunch increases along each train (except for train 7).
Vertical position for each bunch along the train

10 e- Single Turn Vertical Beam Size:
Single turn vertical distribution for 500 turns. Typical single turn distribution Single turn vertical beam size for bunch 1 over 500 turns Single turn mean position for bunch 1 over 500 turns

11 Summary The positron sv decreases along the 3 bunch trains. In addition, the relative mean position of the distribution increases along the train which results in a correlation between sv and the mean vertical distribution. The electron sv increases along the 3 bunch trains. From the single turn analysis it is evident that the e- sv jitter (standard deviation) is ~3 time larger than the e+ sv jitter. The e- mean position jitter is ~2.5 times larger than the e+ mean position jitter.


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