| Autor: |
Smith, Stephen R., Johnson, Ronald G. |
| Předmět: |
|
| Zdroj: |
AIP Conference Proceedings; 2000, Vol. 546 Issue 1, p601, 5p |
| Abstrakt: |
In many modern storage rings, position monitors process beam signals at frequencies above cutoff for propagating modes in the beam duct. This is common in beam ducts with antechambers. Propagating modes introduce fields at the position monitor pickups unrelated to beam position at the monitor, and therefore can cause errors in indicated position. We discuss issues of generation and propagation of these fields, how they couple to position monitor pickups, and steps that can be taken to minimize their effects. We report some experiences with propagating modes affecting position measurements and our experience with lowering the processing frequency of several BPMs, which must operate in wide beam chamber near the interaction point of the PEP-II ring. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
