[Triumf-seminars] TRIUMF Accelerator Seminar today at 14:00

Wed Nov 1 05:00:03 PDT 2017

Date/Time: Wed 2017-11-01 at 14:00

Location:  ISAC II Conf Rm     

Speaker:   Yi-Nong Rao (TRIUMF)

Title:     Brief Report on 40th European Cyclotron Progress Meeting & Correction of Coupling Resonance ν_r – ν_z=1 in TRIUMF Cyclotron

Abstract: The 1st part is to briefly report the highlights from the 40th ECPM which took place in INFN-LNL Italy, 20-23 September 2017.

The 2nd part is about the correction of coupling resonance nu_r-nu_z=1 in TRIUMF cyclotron. The second order linear coupling resonance nu_r-nu_z=1 is driven by an asymmetry in the median plane of the cyclotron due to presence of the first harmonic in B_r. In TRIUMF cyclotron, this resonance is encountered at about 166MeV and 291MeV, where nu_r=1.2 and nu_z=0.2. When the beam is off-centered radially to pass through this resonance, the radial oscillation gets converted into vertical oscillation, which can cause beam loss to occur, though these loss modes do not reduce the machine transmission under normal operation. This report presents the results of simulations and measurements that we performed to correct this resonance by using the existing harmonic coils.

______________________________

General TRIUMF seminar information available at http://www.triumf.ca/home/upcoming-events/about-seminars-lectures