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Laxdal, R. E.

Paper Title Page
MOPAN007 A Non-intercepting Beam Current Monitor for the ISAC-II SC-linac 155
  • W. R. Rawnsley, R. E. Laxdal, A. K. Mitra
    TRIUMF, Vancouver
  A personnel protection system will monitor the ion beam current into the experimental hall from the ISAC-II SC-linac. It will use continuous self-test and redundancy and have an accuracy of ±10% from 1 to 200enA. The system, based on an Atlas design, will use capacitive pickups with rf resonators and buffer amplifiers. Ion charge, velocity and bunch width will affect the sensitivity so periodic calibration with dc Faraday cups will be needed. The signal from each 13cm long, 5cm diameter pickup tube will pass through a vacuum feedthrough to a helical resonator. An AD8075 IC with an input impedance of 87kΩ at 35MHz will allow a high coil tap. The ISAC beam, bunched at 11.8MHz, is injected into the ISAC-II SC-linac via a 25m long transfer line. Monitors will be placed in the transfer line and downstream of the linac before the experimental hall. A 35MHz and a 70MHz coil (3 and 6 harmonic) have loaded Q's of 600. A test in the transfer line of the 35MHz coil gave a sensitivity 0.09mV/enA from the unity gain buffer using 20Ne+5 ions at 1.5MeV/u. The background was equivalent to 1enA. The 70MHz coil gave 0.04mV/enA using 22Ne+4 ions. System design and test data will be presented.  
TUPAN003 Beam Quality and Operational Experience with the Superconducting LINAC at the ISAC II RIB facility 1392
  • M. Marchetto, R. E. Laxdal, V. Zviagintsev
    TRIUMF, Vancouver
  The ISAC II superconducting LINAC is now in the operational phase. The linac was commissioned with stable beams from an off-line source. The commissioning not only proved the integrity of the infrastructure but benchmarked the beam quality and rf cavity performance. Measurements of the transverse and longitudinal emittance are consistent with little or no emittance growth through the acceleration. Transmission near 100% has been achieved though some solenoid steering is evident due to misalignment. The misalignment problem is being evaluated using the beam as diagnostic tool while applying corrections based on the beam measurements. The effectiveness of the corrections will be reported. The machine has been demonstrated to be easy to tune, reliable in restoring beam and flexible enough to accommodate different tuning strategies; software routines have been developed in order to facilitate the tuning process. In this paper the operational routine for tuning and beam delivery will be presented as well as the beam characteristics drawn from the commissioning studies.  
THXAB01 Commissioning and Early Experiments with ISAC II 2593
  • R. E. Laxdal
    TRIUMF, Vancouver
  The first phase of the ISAC-II superconducting accelerator has recently been commissioned. The heavy ion linac adds 20MV to the 1.5MeV/u beam injected from the ISAC post accelerator. The linac is composed of five cryomodules; each cryomodule housing four 106 MHz quarter wave resonators and one 9T superconducting solenoid. On-line performance has confirmed cw operation at a peak surface field in excess of 35MV/m. The talk will describe the very successful commissioning and the early operation with both stable and radioactive beams.  
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