June 12, 2013
Fermi National Accelerator Laboratory Batavia, IL 60510
US/Central timezone

High Pressure Gas-Filled RF Cavities for Use in a Muon Accelerator Cooling Channel

Not scheduled
Wilson Hall Atrium (Fermi National Accelerator Laboratory Batavia, IL 60510)

Wilson Hall Atrium

Fermi National Accelerator Laboratory Batavia, IL 60510

Speaker

Mr Ben Freemire (IIT)

Description

A high pressure hydrogen gas-filled RF (HPRF) cavity can operate in the multi-Tesla magnetic fields required for a muon accelerator cooling channel. A beam test was performed at the Fermilab MuCool Test Area by sending a 400 MeV proton beam through an 805 MHz cavity and quantifying the effects of the resulting plasma within the cavity. The resulting energy loss per electron-ion pair produced has been measured at 10E-18 to 10E-16 J every RF cycle. Doping the hydrogen gas with oxygen greatly decreases the lifetime of an electron, thereby improving the performance of the HPRF cavity. Electron lifetimes as short as 1 ns have been measured. The recombination rate of positive and negative ions in the cavity has been measured on the order of 10E-8 cm3/s. Extrapolation in both gas pressure and beam intensity are required to obtain Muon Collider parameters, however the results indicate HPRF cavities can be used in a muon accelerator cooling channel.

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