[Eng-div] Accelerator Seminar: 1/23/15 - Yue Hao

[Gayle Sundeen]

ACCELERATOR SEMINAR 

"Beam-Beam Effects of Gear Changing in Ring-Ring Colliders" 

Yue Hao 
Brookhaven National Laboratory 

In ring-ring colliders, the collision frequency determines the bunch structures, e.g., the time between the bunches in both rings should be identical. Because of relatively low relativistic speed of the hadron beam in sub-TeV hadron-hadron and electron-ion colliders, scanning the hadron beams energy would require either a change in the circumference of one of the rings, or a switching of the bunch (harmonic) number in a ring. The later would cause so-called gear changing, i.e., the change of the colliding bunches turn by turn. In this talk, we examine the difficulties in beam dynamics in this gear-changing scheme. 

Friday, January 23, 2015 
10:00 a.m. 
ARC, Room 231/233 

------ 
Audrey N. Barron 
Administrative Assistant 
Center for Advanced Studies of Accelerators 
Jefferson Lab 
757-269-7327 
anichols at jlab.org / www.jlab.org 



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