Optimizing the time resolution for the bunched beam using the first superconductor niobium resonator from the Linac accelerator

• Grant number: 11/19785-2
• Support Opportunities: Regular Research Grants
• Start date: August 01, 2012
• End date: January 31, 2015
• Field of knowledge: Physical Sciences and Mathematics - Physics - Nuclear Physics
• Principal Investigator: Nemitala Added
• Grantee: Nemitala Added
• Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated researchers: Leandro Romero Gasques ; Nilberto Heder Medina ; Valdir Guimarães

Abstract

A beam of particles endowed with a temporal structure allows both carrying out the measuring of excited states mean lives and ejecting masses coming from a nuclear reaction, by using a too simple experimental setup, which minimizes investiments aimed at the acquisition and maintenance of such a systems.Both minimum values of mean lives and mass resolution of the experimental setups depend upon the time resolution value of the beam particles temporal structure which is incident to the target. A major requirement for the Linac Accelerator installation was the continuous beam particles adaptation from Pelletron to be fed into the superconducting structures, since they are excited by electromagnetic radiation in the radiofrequency range (97 MHz). The pulsed beam system installed before the Pelletron accelerator tube (prebuncher) allows the beam bunching into packages with a typical resolution of 1.5 ns, with intervals of 82.5 ns, obtained by an applied sawtooth tension in a submultiple of the resonators frequency (12.125 MHz).Updating the control electronic for this system will supply us with a higher reliability while using the time reference information for the acquisition systems at the laboratory.It is obtained a gain of at least one magnitude order, as using the first superconducting resonator of the Linac Accelerator (superbuncher) in order to improve the time resolution of such a bunches, allowing an improvement both in the mass identification and in minimum values of mean lives of the observed excited states.Furthermore, the particle beams passage and control across this first resonator will demonstrate the required domain to make it possible to accelerate this beam in the remaining resonators of the accelerator, since the required control modules and infrastructure are essentially the same. (AU)