Statistical Measurement of Longitudinal Beam Halo in Fermilab Recycler

Conference · Mon Jun 24 00:00:00 EDT 2019

DOI:https://doi.org/10.18429/JACoW-IPAC2019-WEPGW106· OSTI ID:1843482

Prebys, Eric  ^[1]; Dyshkant, Alexander  ^[2]; Gaponenko, Andrei  ^[3]; Hedin, David  ^[2]; Hooper, Ryan  ^[4]; Jones, Matthew  ^[5]; Nguyen, Truong ^[1]

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1. UC, Davis, Dept. Math.
2. Northern Illinois U.
3. Fermilab
4. Lewis U.
5. Purdue U.

The formation of non-Gaussian halo in both the transverse and longitudinal dimensions of beam bunches has been notoriously difficult both the model and to measure. We present a technique to measure the longitudinal halo of 2.5 MHz bunches in the Fermilab Recycler, which have been formed for the g-2 anomalous magnetic moment experiment. While out of time beam is not a particular concern to this experiment, it is a key issue for the subsequent Mu2e rare muon decay experiment, which will use the same bunch formation procedure. Our measurement relies on a statistical technique, in which a small fraction of the beam is scattered from the primary collimation foil in the recycler, and then is detected by a charge telescope consisting of quartz Cherenkov radiators and photomultiplier tubes. By integrating over many revolutions, the time profile of longitudinal halo (out-of-time beam) can be measured down to less than a 10⁻⁵ fractional level, relative to in-time beam. These results can then be compared to simulations.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1843482
• Report Number(s): FERMILAB-CONF-19-800-PPD; oai:inspirehep.net:1745382
• Country of Publication: United States
• Language: English

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