AGS Longitudinal emittance measurements for upcoming RHIC low energy gold runs
- Brookhaven National Lab. (BNL), Upton, NY (United States)
Many longitudinal emittance (ε) measurements were made in the AGS towards the end of Run 18 with Au from EBIS at the flattop energies to be used for the upcoming RHIC low energy runs. The primary motivation for this was to determine what emittances and bunch intensities could be provided by the injectors. The measurements were also taken for many different configurations to try to gain a better understanding of the observed ε growth on the acceleration ramp in the hope of finding some way to reduce it. The tentative requirements for the 5 energies are shown in Table I. Different parameters were varied depending on the requirements at each extraction energy and they included: The type of AGS merge, the main magnet voltage banks (Pulsed and Flattop) used for ramping, the ramp and flattop Rf voltages, and the amount of bunch squeezing after the merge. The measurements were made over a period of a month (May 15 to June 15), starting with the lowest energy and generally working up to the highest. The measurements for each energy, from lowest to highest, are in Tables II through VI, respectively. Figures 4 through 7 also show some of the more relevant data for the first four energies. Table VII (and Figure 8) show the data for the best candidates for the different energies. Some of the setups may seem irrelevant, but at the time that was not clear. This is particularly true in cases where the ramping and flattop voltages were varied. On the other hand, with the benefit of hindsight, there are setups that should have been checked but weren’t.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- DOE Contract Number:
- SC0012704
- OSTI ID:
- 1481406
- Report Number(s):
- C-A/AP/615; BNL-209430-2018-TECH
- Country of Publication:
- United States
- Language:
- English
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