[Triumf-seminars] TRIUMF ISAC Seminar today at 10:30

Wed, 23 Feb 2005 05:00:01 -0800

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Date/Time: Wed 2005-02-23 at 10:30

Location:  Auditorium          

Speaker:   Mathew Smith (TRIUMF/UBC)

Title:     Simulation and Off-line testing of a square-wave-driven RFQ cooler and buncher for TITAN

Abstract: The TITAN (TRIUMF’s Ion Traps for Atomic and Nuclear science) experiment will carry out Penning trap mass spectrometry on the radioactive isotopes produced at TRIUMF’s ISAC facility.  The resolution of such measurements is proportional to the charge of the ion in consideration; hence, the system will use an EBIT (Electron Beam Ion Trap) in order to prepare the ions in a high charge state before injection into the Penning trap.  This will make it possible to carry out high precession mass measurements (dm/m = 1x10-8), for short-lived (t1/2 approx 50 ms) 0+ to 0+ superallowed beta emitters, that are required for tests of the CVC (Conserved Vector Current) hypothesis and CKM matrix unitarity. 

In order to obtain efficient injection of the ISAC beam into the EBIT it will be necessary to use an RFQ (Radiofrequency Quadrupole) cooler and buncher to modify it’s emittance.  Unlike previous such coolers, which have been driven sinusoidally, the RFQ developed for TITAN is driven with a large amplitude (Vpp = 400 V) high frequency (f = 1 MHz) square-wave.  This overcomes the problem of limited bandwidth associated with sinusoidally-driven traps, making broadband operation of an RFQ cooler possible for the first time.

Based on the results of simulations the RFQ has been designed and built along with an off-line test system.  This includes an ion source and four-way switching unit, as well as beam injection and extraction optics.  Results from the simulation and off-line testing of the system will be presented.

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