TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
Universität Muenster, Physikalisches Institut, Muenster, Germany
SFU, Burnaby, BC, Canada
UBC & TRIUMF, Vancouver, British Columbia, Canada
Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany
University of Manitoba, Manitoba, Canada
Heidelberg University, Physics Institute, Heidelberg, Germany
UW/Physics, Waterloo, Ontario, Canada
University of Calgary, NW Calgary, Alberta, Canada
MPI, Muenchen, Germany
Modern rare isotope facilities provide beams of shortlived radionuclides primarily for studies in the field of nuclear structure, nuclear astrophysics, and low energy particle physics. At these facilities, many activities such as re-acceleration, improvement of resolving power, and precision experimental measurements require charge breeding of ions. However, the charge breeding process can increase the energy spread of an ion bunch, adversely affecting the experiment. A Cooler Penning Trap (CPET) is being developed to address such an energy spread by means of sympathetic electron cooling of the Highly Charged Ion bunches to . 1 eV/q. Recent work has focused on developing a strategy to effectively detect the trapped electron plasma without obstructing the passage of ions through the beamline. The first offline tests demonstrate the ability to trap and detect more than 108 electrons. This was achieved by using a novel wire mesh detector as a diagnostic tool for the electrons.
* E.M. Burbidge et al, Rev Mod Phys, 29 547 (1957)
** V.V. Simon et al, Phys Rev C, 85 064308 (2012)
*** Z. Ke et al, Hyp Int, 173 103 (2006)
**** U. Chowdhury et al, AIP Conf Proc, 1640 120 (2015)
Fermilab, Batavia, Illinois, USA
JLab, Newport News, Virginia, USA
Muons, Inc, Illinois, USA
IIT, Chicago, Illinois, USA
Fermilab, Batavia, Illinois, USA
University of Chicago, Chicago, Illinois, USA
BNL, Upton, Long Island, New York, USA
Ionization cooling is the preferred method of cooling a muon beam for the purposes of a bright muon source. This process works by sending a muon beam through an absorbing material and replacing the lost longitudinal momentum with radio frequency (RF) cavities. To maximize the effect of cooling, a small optical beta function is required at the locations of the absorbers. Strong focusing is therefore required, and as a result normal conducting RF cavities must operate in external magnetic fields on the order of 10 Tesla. Vacuum and high pressure gas filled RF test cells have been studied at the MuCool Test Area at Fermilab. Methods for mitigating breakdown in both test cells, as well as the effect of plasma loading in the gas filled test cell have been investigated. The results of these tests, as well as the current status of the two leading muon cooling channel designs, will be presented.