Method for maximizing the brightness of the bunches in a particle injector by converting a highly space-charged beam to a relativistic and emittance-dominated beam

• US 9,408,289 B2
• Filed: 03/04/2015
• Issued: 08/02/2016
• Est. Priority Date: 03/09/2014
• Status: Expired due to Fees

• Current Assignee: Jefferson Science Associates, Llc
• Original Assignee: Jefferson Science Associates, Llc
• Inventors: Hannon, Fay
• Primary Examiner(s): Owens, Douglas W
• Assistant Examiner(s): Sathiraju, Srinivas
• Application Number:
  US14/638,319
• Publication Number:
  US 20150257247A1
• Time in Patent Office: 517 Days
• Field of Search: 315/501, 315/500
• US Class Current: 1/1
• CPC Class Codes: H05H 2007/004 for modifying beam energy, e.g. spread out Bragg peak devices
• CPC Class Codes: H05H 2007/025 Radiofrequency systems
• CPC Class Codes: H05H 7/001 Arrangements for beam delivery or irradiation irradiation systems per se G21K5/00
• CPC Class Codes: H05H 7/02 Circuits or systems for supplying or feeding radio-frequency energy radio-frequency generators H03B

Abstract

A method for maximizing the brightness of the bunches in a particle injector by converting a highly space-charged beam to a relativistic and emittance-dominated beam. The method includes 1) determining the bunch charge and the initial kinetic energy of the highly space-charge dominated input beam; 2) applying the bunch charge and initial kinetic energy properties of the highly space-charge dominated input beam to determine the number of accelerator cavities required to accelerate the bunches to relativistic speed; 3) providing the required number of accelerator cavities; and 4) setting the gradient of the radio frequency (RF) cavities; and 5) operating the phase of the accelerator cavities between −90 and zero degrees of the sinusoid of phase to simultaneously accelerate and bunch the charged particles to maximize brightness, and until the beam is relativistic and emittance-dominated.

Claims

1. A method for maximizing the brightness of a bunch of charged particles in a particle injector, comprising:

a. providing an input beam;

b. determining the bunch charge and the initial kinetic energy of the highly space-charge dominated input beam;

c. applying the bunch charge and initial kinetic energy properties of the highly space-charge dominated input beam to determine a number of accelerator cavities required to accelerate the bunches to relativistic speed;

d. providing the required number of accelerator cavities;

e. setting the gradient of the radio frequency (RF) cavities; and

f. operating the accelerator cavities at a phase between −

90 and zero degrees of the sinusoid of phase to simultaneously accelerate and bunch the charged particles until the beam is relativistic and emittance-dominated.