Beams Document 4760-v1

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Microwave Measurement of Recycler Electron Cloud, 12/19/14

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Jeffrey Eldred
Updated by:
Jeffrey Eldred
Document Created:
10 Feb 2015, 15:30
Contents Revised:
10 Feb 2015, 15:30
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13 May 2015, 16:25
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Measurements of Electron Cloud in the Fermilab Recycler are shown, using microwave propagation between BPM plates VP130 and VP202. The results shown strong ecloud activity only after the first batch, in marked contrast to simultaneous RFA measurements, loss patterns, and previous microwave measurements. The batch dependence and the bunch-length dependence match the Recycler instability; however we have no electron cloud model that explains all the features of the Recycler instability. These are the first microwave measurements made since the Fall 2014 shutdown, previous microwave measurements of electron cloud in the Recycler were made using VP201 and VP203. Presentation originally made to Fermilab ECLOUD group.
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Date uploaded to DocDb does not reflect the date the presentation was given and the data was collected (December 2014)
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