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Nuclear Seminars 2014 Spring


  Title: The TRIUMF experience with the Design, Fabrication and
Commissioning of Large Gap Wien Filters
  Speaker: Dr. Syd Kreitzman
  Institute: TRIUMF, Canada
  Date: Monday, April 28, 2014
  Time: 3:00 - 4:00 pm EST
  Place: Nieuwland Science Hall, Room 124

  Abstract:

In recent years TRIUMF has built two surface Muon (29.5 MeV/c) beam-lines each of which contained dual large gap Wien Filters. These were designed with the dual purpose of particle separation and simultaneous muon spin rotation up to 90 degrees (thereby creating a clean beam with variable transverse polarization). To achieve these functions achromatically (i.e. with essentially 100% transmission for a Δp/p of 10%), a phase space inverting triplet separated the Wien filter pair.
The Wien filter specifications are similar for the two pairs: Operating E-field range ~5-45kV/cm, effective length ~1.5m, operating B-field range ~60-540G, with the difference between the two pairs reflected in their inter-electrode gap. The first device pair required a gap of 12cm and the second a gap of 8cm, thereby requiring the systems to be designed for +/-300 and +/-200kV respectively. Due to space considerations, the +/-300kV system was designed with external power supply stacks + HV cables, whereas the +/-200kV system contained stacks internally integrated in the Wien filter.
To reliably commission these systems, many hard lessons were learned, with the most severe ones being revealed in the first +/-300kV system. Specific details on: i) Max e-field specifications; ii) power supply and cable issues; iii) feedthrough design; iv) triple point considerations; v) insulator design; vi) surface finish requirements; vii) conditioning and safety practices; and vii) cleanliness requirements will be discussed in the presentation.


Topic

Date

Speaker

Double beta decay and matter
dominated universe
January 14 Prof. Tadafumi Kishimoto
Research Center for Nuclear Physics, Osaka University, Japan
Nuclear Structure Studies with the Active-Target Time-Projection-Chamber: Moving Towards Exotic Beams January 20 Dr. Tan Ahn
NSCL/Michigan State University
Ion Traps for Astrophysics January 27 Dr. Jason Clark
Argonne National Laboratory
Probing Properties of the Weak Interaction using Trapped Atoms and Ions February 3 Prof. Daniel Melconian
Texas A&M University
Fishing in a sea of Xe – Barium-ion tagging for 136Xe double-beta decay studies with EXO February 17 Dr. Thomas Brunner
Stanford University
Accelerator Mass Spectrometry of Heavy Isotopes February 18 Dr. Stephan Winkler
University of Vienna, Austria
Nuclear astrophysics constraining cosmology February 20 Prof. René Reifarth
Goethe-University Frankfurt
am Main, Germany
Nuclear Data Measurements at LANSCE:
The NIFFTE fission TPC
February 24 Dr. Rhiannon Meharchand
Los Alamos National Laboratory
Modifications of the Nuclear Shell Structure: Spectroscopy in Islands of Inversion March 3 Prof. Kathrin Wimmer
Central Michigan University
Spring Break
Advances in Explosive Nuclear Astrophysics March 31 Dr. Gavin Lotay
University of Surrey, UK
Isospin Invariant Energy Density
Functional Approach
April 14 Dr. Javid Sheikh
Oak Ridge National Laboratory
An Advanced Ion Guide for Beam
Cooling and Bunching for Collinear Laser Spectroscopy of Rare Isotopes
Tue. April 22 Dr. Bradley Barquest
NSCL, MSU
Easter Holiday
The TRIUMF experience with the
Design, Fabrication and Commissioning
of Large Gap Wien Filters
April 28
3:00pm
Dr. Syd Kreitzman
TRIUMF,Canada
Neutrino and neutron spectroscopy
using trapped ions
May 5 Dr. Nicholas Scielzo
Lawrence Livermore National Laboratory
TBA May 12 Ms. Qian Li
Univeristy of Notre Dame


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