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Bunch Profiling with a Rotating Mask

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Presentation on theme: "Bunch Profiling with a Rotating Mask"— Presentation transcript:

1 Bunch Profiling with a Rotating Mask
Mitchell Miller with Dr. Alan Fisher

2 Synchrotron Light Acceleration of charged particles = radiation
As V  C the radiation becomes focused Using a strong B field forces electrons to orbit Synchrotrons are a large ring of uniform B Beams generated are used for nearly infinite applications

3 LHC LHC is a proton collider, not synchrotron
Greater mass = less synchrotron radiation Collisions require careful beam alignment Order of microns compared to kilometers in circumference Previous bunch measurement techniques involved: High speed camera Long time Frequent replacement from radiation damage

4 Solution: Rotating Mask
Wheel with four groups of three slots Each group has slot at 0°,45°, and 90° Slots provide line integration points PMT will detect light that passes through slot In one ring turn slot has shifted slightly providing a new point with every ring turn Combining every point will give a Gaussian profile Each bunch will have a unique profile

5 Slot Positions

6 Profile Creation Each bunch provides a peak
Peaks are chosen using software that indexes each bunch Output from motor is recorded, giving position of wheel One bunch measured for this experiment “Timing Bunch”

7 Profile Results

8 Fitting to Obtain Beam Size
Beam sigma = µm Expect sigma = µm

9 Error Diffraction effects Precise focus PMT charging effects
Sampling and data access

10 Conclusion Benefits Drawbacks Deployment at LHC Fast
Radiation resistant Simple Drawbacks Error from diffraction (possibly from sampling rate) Deployment at LHC

11 Thank You Questions


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