| Paper |
Title |
Page |
| WEBZ01 |
Correction of unevenness in Recycler beam profile
|
244 |
| |
- K. Y. Ng, J. L. Crisp, M. Hu
Fermilab, Batavia, Illinois
|
|
| |
When a beam is confined between two rf barriers in the Fermilab Recycler Ring, it is observed that the longitudinal beam profile between the barriers is in general very uneven (typically about 20% for a beam of intensity 5E11). This leads to the consequence that the momentum-mined antiproton bunches may have an intolerable variation in bunch intensity. It is shown that the observed unevenness in beam profile is the result of a tiny amount (around 2%) of rf potential imperfection and a tiny amount (around 0.5%) of rf beam loading. The beam profile can be made even by feeding back the unevenness of the effective rf potential to the low-level rf.
|
|