Abstract
Stable operation of a high-voltage high-current dc photoemission gun for the bunched beam electron cooler in RHIC
Highlights
To improve the integrated luminosity and lifetime limited by intrabeam scattering (IBS), a reduction of the transverse and longitudinal beam sizes σ and σl, will be achieved using the Low Energy Relativistic Heavy Ion Collider (RHIC) electron Cooler (LEReC) [15,16,17,18,19,20,21,22] located in IR2
Low Energy RHIC electron Cooling (LEReC) operated with an average current of up to 30 mA and demonstrated the design beam quality with low emittance and energy spread
When the MC is moved to the P1 position, the switch around R1 in Fig. 4 is open and the electron gun is in the conditioning mode; when the movable conductor is at the P2 position, the running resistor (R2) is connected between the electron gun and the high-voltage power supply (HVPS)
Summary
Motivation The Relativistic Heavy Ion Collider (RHIC) [1,2,3,4] at Brookhaven National Laboratory (BNL) is a circular collider that has operated successfully for almost two decades It has two rings in a horizontal plane with two head-on beam-beam interaction points (IP6 and IP8) and four crossing points without collisions (IP2, IP4, IP10, and IP12). For the BES program, the planned beam energies are 3.85, 4.59, 5.75, 7.3, and 9.8 GeV=nucleon At these energies, the luminosity is limited due to the relatively short ion beam lifetime and fast growth of both the transverse and longitudinal beam emittance because of several physical effects [10,11,12,13], such as intrabeam scattering (IBS), space charge, and beam-beam effects. To improve the integrated luminosity and lifetime limited by IBS, a reduction of the transverse and longitudinal beam sizes σ and σl, will be achieved using the Low Energy RHIC electron Cooler (LEReC) [15,16,17,18,19,20,21,22] located in IR2 (see Fig. 1)
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