Tuning the Operational Parameters of the First Microtron Stage

Author(s)

Cristiane Jahnke

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Instituto de Física (IF/SBI)
• Defense date: 2012-03-14

Examining board members

Marcos Nogueira Martins; Nemitala Added; Celso Fuhrmann

• Advisor: Marcos Nogueira Martins

Abstract

The Laboratório do Acelerador Linear is building a racetrack microtron electron accelerator. It has two acceleration stages: the booster and the main microtron. The injection system has already been commissioned and is delivering a 1.9-MeV continuous wave beam. This beam will be injected in the booster stage, which is ready to be commissioned, and should increase the energy to 5 MeV. The aim of this work is to optimize the operation parameters of the booster stage by means of simulation tools. We also studied the feasibility of injecting the 1.9 MeV beam in the booster, which has been designed to operate with a 1.765 MeV beam. Some simulation routines had to be developed in order to determine the admittance of the booster stage. For the 1.765 MeV beam the admittances were determined to be 3.08 pi mm.mrad, 0.58 pi mm.mrad, and 0.38 pi keV.rad for the transverse horizontal, transverse vertical, and longitudinal phase spaces, respectively. For the 1.9 MeV injection beam we were able to find a viable acceleration condition, with slightly better admittances: 3.65 pi mm.mrad, 0.62 pi mm.mrad, and 0.77 pi keV.rad, for the same phase spaces cited above. The injection beam has been characterized previously, and the available data were used, in the simulation codes, to match the transverse beam emittances of the injector to the transverse beam admittances of the booster. The phase space manipulations were accomplished by tuning a quadrupole triplet placed before the booster entrance. These simulations are intended as a supporting tool for the commissioning of the booster stage, helping the experimental determination of the working parameters and their optimization. (AU)

• FAPESP's process: 10/03350-4 - Tuning the Operational Parameters of the First Microtron Stage
• Grantee: Cristiane Jahnke
• Support Opportunities: Scholarships in Brazil - Master