Abstract

Beam intensity is a key performance parameter for particle accelerators. Modern high-performance storage rings demand injectors that can deliver large currents per injection cycle, which translates to an increase in machine size and consumed power. Therefore, it is justifiable to look for ways to increase the injector's performance while minimizing the size increase. We have investigated a number of ways to accumulate charge in a booster synchrotron and applied one of them to the NSLS-II booster. We have designed a scheme to transversely stack two bunch trains from the injector linac in the booster. In this paper we discuss this stacking scheme. The relevant booster dynamics are studied. The charge transport efficiency of the stacking scheme is studied in detail at injection and through a full booster ramp. Pulsed magnet requirements for the injection system and methods to achieve them are discussed. We show that the charge transport efficiency of the stacking scheme is similar to a single bunch train in the booster. This has become a critical design feature of the NSLS-II booster.

Highlights

  • Beam intensity is a key performance parameter for particle accelerators

  • Modern high-performance storage rings demand injectors that can deliver large currents per shot, which translates to an increase in machine size and consumed power

  • We have developed a method to transversely stack two bunch trains in the booster to ensure that the charge requirement can be met

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Summary

INTRODUCTION

Beam intensity is a key performance parameter for particle accelerators. Modern high-performance storage rings demand injectors that can deliver large currents per shot, which translates to an increase in machine size and consumed power. Beam stacking in a circular machine is a well-known method of accumulating charged particles when their source has limited intensity. We discuss methods of increasing the NSLS-II injector performance by accumulating the bunch trains during the booster ramp. Beam motion, power supply variations, and the nonlinear fields in the combined function magnets during the early portions of the ramp can eat away at the remaining acceptance or cause emittance growth. This can cause enough charge loss such as to make the stacking scheme worse than ramping a single beam. The effect of the field errors at low field for beam with betatron amplitudes several times their emittance

NSLS-II BOOSTER REFERENCE DESIGN
BOOSTER INJECTION SYSTEM
BOOSTER RAMP WITH SINGLE TRAIN INJECTION
BEAM STACKING
Findings
CONCLUSION
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