| Autor: |
Angoletta, M E, Bodendorfer, M A, Findlay, A, Hancock, S, Manglunki, D |
| Jazyk: |
angličtina |
| Rok vydání: |
2014 |
| Předmět: |
|
| Popis: |
For the 2013 LHC ion run the anticipated request for batches from the PS Complex comprising four ion bunches spaced by 100 ns was changed to batches of two bunches spaced by 200 ns. This modified demand was met by suppressing a splitting step in the PS machine, but with the consequence of halving the longitudinal emittance required from LEIR. Thus NOMINAL Pb54+ beams from LEIR had to be delivered inside ~9 eVs to provide sufficient blow-up margin in the PS. Machine Development (MD) sessions were carried out in LEIR to investigate methods to satisfy these stricter requirements. Two main ingredients were found to reduce longitudinal emittance. The first and most important was to adjust carefully the frequency offset at capture in order to align the RF with the position where the beam is deposited by the electron cooling system prior to acceleration. The second ingredient was to reduce the final bucket area in order to reduce any residual filamentation during capture. This note documents the results obtained in several MD sessions carried out in January 2013 and provides guidelines on how to set up similar beams. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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