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The Electron Lens upgrade project at the Relativistic Heavy Ion Collider (RHIC) has reached an operational status, whereby intense, pulsed or DC beams of electrons are generated in order to interact with the RHIC polarized proton beams in both the Blue and Yellow Rings at the 10 o'clock Interaction Region. Interactions between the electrons and protons are utilized to counteract the beambeam effect that arises from the desired polarized proton collisions, which result in a higher RHIC luminosity. A complex system for operating the e-lens has been developed, including superconducting and nonsuperconducting magnet controls, instrumentation systems, a COTS-based Machine Protection System, custom Blue and Yellow e-lens timing systems for synchronizing the electron beam with the RHIC timing system, beam alignment software tools for maximizing electron-proton collisions, as well as complex user interfaces to support routine operation of the system. elens software and hardware design will be presented, as well as recent updates to the system that were required in order to meet changing system requirements in preparation for the first operational run of the system. E-LENS GOALS AND DESIGN The Blue and Yellow e-lenses are installed in the RHIC Ring at Interaction Region 10, in order to partially counteract the head-on beam-beam tune shift effect on the colliding RHIC beams, and thus permit RHIC proton beam operations at higher beam intensities, and therefore higher colliding beam luminosities for the RHIC experiments [1]. First commissioned during the FY2014 run, both electron lenses were successfully operated on a routine basis in a DC mode during the FY2015 RHIC 100 GeV polarized proton run [2]. The main components of each e-lens are the electron gun, electron collector, and superconducting solenoid magnet, though a set of additional systems is required for their routine operation. Beam transport magnets of both superconducting and non-superconducting varieties are controlled through two separate sets of standard VME hardware and software: warm magnets use equipment (PSC, QFG, and PSI) developed for the Injector machines within the Brookhaven National Laboratory (BNL) Collider-Accelerator (C-A) Department, and the cold magnets utilize the RHIC equipment (WFG, MADC) for reference control and readback information. Another system of note is beam instrumentation, which is primarily comprised of BPMs, current transformers, YAG crystal-based beam profile monitors, pinhole raster scan beam profilers, as well as new electron backscattering detectors [3]. TIMING SYSTEM The Blue and Yellow e-lenses must be capable of operating in two distinct timing modes: pulsed mode for beam diagnostic measurements and system commissioning, as well as DC mode for routine operations. Activity in pulsed mode must be synchronized with the RHIC Event and Beam Sync Links, such that the timing system is capable of pulsing electron beam from the e-lens as a desired RHIC hadron bunch is passing through the Blue or Yellow Ring in IR10. To achieve these requirements, both e-lenses are dependent on the existing RHIC timing links as shown in Figure 1. Figure 1: Schematic of the e-lens timing system, including RHIC components (building 1004A) and e-lens-specific components (1010B).

Design and status for the Electron Lens Project at the Relativistic Heavy Ion Collider