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DOE OSTI2018

STATUS OF THE JLEIC ION COLLIDER RING DESIGN

We present an update on the lattice design and beam dynamics study of the ion collider ring of JLEIC (Jefferson Lab Electron Ion Collider). The collider ring consists of two 261.7 degree arcs connected by two straight sections crossing each other. One of the straights houses an interaction region (IR) and is shaped to make a 50 mrad crossing angle with the electron beam at the interaction point (IP) to meet physics requirements. The forward acceptance requirements downstream of the IP in the ion direction lead to an asymmetric IR lattice design. The detector solenoid effects and the multipole fields of the IR magnets further complicate this picture. In this paper, compensation of the detector solenoid effects is considered together with orbit correction and multipole effects. We also study local compensation of the magnet multipoles using dedicated multipole correctors. And an optimization of the betatron tunes is also presented.

Wei, Guohui↗

DOE OSTI2018

Analysis of Spin Response Function at Beam Interaction Point in JLEIC

The spin response function is determined by a collid-er’s magnetic lattice and allows one to account for con-tributions of perturbing fields to spin resonance strengths. The depolarizing effect of an incoming beam depends significantly on the response function value at the interaction point (IP). We present an analytic calcula-tion of the response function for protons and deuterons at the IP of Jefferson Lab Electron Ion Collider (JLEIC) over its whole momentum range. We find a good agreement of the analytic calculation with our numerical modeling results obtained using a spin tracking code, Zgoubi.

Derbenev, Yaroslav S.↗

DOE OSTI2018

JLEIC electron ring dynamic aperture with non-linear field errors

We present results of dynamic aperture study for the updated electron ring lattice of the Jefferson Lab Electron- Ion Collider (JLEIC). The lattice design features low emittance arcs with local compensation of sextupole nonlinear effects, and low emittance non-linear chromaticity correction sections. Dynamic aperture tracking simulations are performed to evaluate the effects of non-linear field errors, the sensitivity to betatron tune, and the impact of momentum error. Dynamic aperture is also evaluated with the measured PEP-II field errors. Preliminary tolerances to the non-linear field errors in the Final Focus quadrupoles are estimated.

Nosochkov, Yuri↗

DOE OSTI2018

Updates on Collective Effects Estimations for the JLEIC

JLEIC is the high luminosity and high polarization electron-ion collider (EIC) currently under active design at Jefferson Lab. It aims at high luminosity 1033~1034 cm-2s-1for a wide range of ion species and center-of-mass energies. This luminosity performance relies sensibly on beam stability with high intensity electron and ion beam operation. The impedance budget analysis and the estimations of the single and multibunch instabilities are currently underway. In this paper, we present the update status of estimations for the longitudinal and transverse coherent instabilities, and identify areas or parameter regimes where special attentions for instability mitigations are required.

Li, Rui↗

DOE OSTI2018

Revised Optics Design for the JLEIC Booster

We outline the recently redesigned booster for the proposed Jefferson Lab Electron Ion Collider (JLEIC). This booster will inject protons (or ions of equivalent rigidity) at 280 MeV and accelerate them to 8 GeV kinetic energy. To avoid transition crossing, the booster uses flexible momentum compaction (FMC) lattices to raise the transition gamma above the reach of the machine. We also include several families of sextupoles to simultaneously control the chromaticities, and nonlinear dispersions that were excited by the FMC cells.

Nissen, E.↗

DOE OSTI2018

952.6 MHz SRF cavity development for JLEIC

JLab is developing new SRF cavity designs at 952.6 MHz for the proposed Jefferson Lab Electron-Ion Collider (JLEIC). New cavities will be required for the ion ring, cooler ERL and booster and eventually for the electron ring to allow the highest possible bunch collision rate. The challenges include the need for strong HOM damping, high fundamental mode power couplers and high HOM power. Initial focus is on the cooler ERL five- cell cavity as this is a critical component for the strong, high energy, bunched-beam cooling concept. One-cell and five-cell Nb prototype cavities have been designed and fabricated. Details concerning the cavity fabrication and test results for the will be presented.

Rimmer, Robert A.↗

DOE OSTI2019

Dynamic Aperture of JLEIC Electron Collider Ring with Errors and Correction

Design of the electron and ion rings of the Jefferson Lab Electron-Ion Collider (JLEIC) features the low-beta Interaction Regions (IR) with detector solenoid, non-linear chromaticity compensation blocks (CCB), and spin rotator optics with solenoids. The high beta functions in the IR final focus quadrupoles (FFQ) and in the CCB magnets result in strong effects of errors in these magnets. Performance of the spin rotators may also be sensitive to the errors. The first part of this study includes the design of orbit correction system for both rings and evaluation of dynamic aperture (DA) with misalignment and the correction. The second part is devoted to the DA study with the FFQ non-linear field errors. The orbit correction design, the dynamic aperture, and the impact on error specifications are presented.

Lin, F.↗

DOE OSTI2019

FULL ACCEPTANCE INTERACTION REGION DESIGN OF JLEIC

Nuclear physics experiments envisioned at a proposed future Electron-Ion Collider (EIC) require high luminosity of 10^33-10^34 cm^-2s^-1 and a full-acceptance detector capable of reconstruction of a whole electron-ion collision event. Due to a large asymmetry in the electron and ion momenta in an EIC, the particles associated with the initial ion tend to go at very small angles and have small rigidity offsets with respect to the initial ion beam. They are detected after they pass through the apertures of the final focusing quadrupoles. Therefore, the apertures must be sufficiently large to provide the acceptance required by experiments. In addition, to maximize the luminosity, the final focusing quadrupoles must be placed as close to the interaction point as possible. A combination of these requirements presents serious detection, optics and engineering design challenges. We present a design of a full-acceptance interaction region of Jefferson Lab Electron-Ion Collider (JLEIC). The paper presents how this design addresses the above requirements up to an ion momentum of 200 GeV/c. We summarize the magnet parameters, which are kept consistent with the Nb-Ti superconducting magnet technology.

Morozov, V.S.↗

DOE OSTI2019

Status Update of a Harmonic Kicker Development for JLEIC

THE UPDATE ON THE STATUS OF HARMONIC KICKER DEVELOPMENT Gunn Tae Park, Jiquan Guo, Shaoheng Wang, James Henry, Mattew Marchlik,Robert Rimmer, and Haipeng Wang Thomas Jefferson National Laboratory, Newport News, VA 23606, USA Abstract An effort to develop the second prototype of the harmonic kicker for the Circulator Cooler Ring (CCR) of the Jeffer- son Lab Electron-Ion Collider (JLEIC) is under way. After beam dynamics study and RF design of the kicker [1], fur- ther progress has been made on coupler (loop) design, tuner ports, multipacting study, and mechanical design. On its compatibility with beam dynamics, the effects of multipoles was investigated and scheme to cancel the effects was devel- oped

Park, Gunn Tae↗

DOE OSTI2019

MAGNETIZED ELECTRON SOURCE FOR JLEIC COOLER

Magnetized bunched-beam electron cooling is a critical part of the Jefferson Lab Electron Ion Collider (JLEIC). Strong cooling of ion beams will be accomplished inside a cooling solenoid where the ions co-propagate with an electron beam generated from a source immersed in a magnetic field. This contribution describes the production and characterization of magnetized electron beam using a compact 300 kV DC high voltage photogun and bialkali-antimonide photocathodes. Beam magnetization was studied using a diagnostic beamline that includes viewer screens for measuring the shearing angle of the electron beamlet passing through a narrow upstream slit. Correlated beam emittance with magnetic field (0-1.5 kG)at the photocathode was measured for various laser spot sizes. Measurements of photocathode lifetime were carried out at different magnetized electron beam currents up to 28 mA and high bunch charge up to 0.7 nano-Coulomb was demonstrated.

Suleiman, R.↗

DOE OSTI2019

Multipole effects on dynamic aperture in JLEIC ion collider ring

In a collider, stronger focusing at the interaction point (IP) for low beta-star and high luminosity produces large beams at final focusing quadrupoles (FFQs). To achieve the high luminosity requirement in the Jefferson Lab Electron-Ion Collider (JLEIC), the interaction region (IR) beta functions peak at ~4.2 km in downstream FFQs. These large beta functions and FFQ multipoles reduce the dynamic aperture (DA) of the ring. A study of the multipole effects on the DA was performed to determine limits on multipoles, and to include a multipole compensation scheme to increase the DA and beam lifetime.

Rajput-Ghoshal, Renuka↗

DOE OSTI2018

TAMU JLEIC Dipole Project Final Report

The Accelerator Research Lab has developed a long-length superconducting cable-in-conduit and a fiber-reinforced polymer structure for use in building a 3 T superferric dipole for the arcs of JLab/s proposed JLEIC collider.

36 MATERIALS SCIENCE↗

DOE OSTI2018

JLEIC HOM Damping Study

The JLab Electron-Ion Collider (JLEIC) proposed by Jefferson Lab is a high luminosity collider consists of a few high current sub-complexes, including a 3-12 GeV electron collider ring with up to 3 A beam current, a 20-100 GeV ion collider ring of up to 1 A, and a 20-55 MeV circulation bunched electron cooler ring with up to 1.5 A. Beam induced HOM problems are prevalent in the RF systems of all these accelerator sub-complexes. In this talk, we will present our preliminary HOM damping study in these RF systems.

Guo, Jiquan↗

DOE OSTI2018

Polarized Ion Beams with JLEIC

alk on Polarized Ion Beams with JLEIC at Workshop on polarized light ion physics with EIC, Ghent University, Ghent, Belgium, February 8, 2018

Morozov, V.↗

DOE OSTI2017

SRF Systems for the Jefferson Lab Electron Ion Collider (JLEIC)

We report on the development of new CW SRF systems for the colliding rings of a proposed electron-ion collider (EIC) at Jlab. Jefferson Lab is developing new strongly HOM-damped SRF cavities for the ion collider ring and a high-energy electron cooler at 952.6 MHz. The baseline design JLEIC will re-use the PEP-II 476 MHz cavities for the electron ring with a possible future upgrade to 952.6 MHz SRF cavities at a later date. We discuss the design optimization of the new high current cavities and compare options for the strong HOM damping required. A concept for a modular cryostat to house these various cavities will be shown, and an overview of the challenging high-level parameters will be presented. These designs and concepts may be useful in other high current storage rings and ERLs.

Rimmer, Robert↗

DOE OSTI2017

The low Q 2 chicane and Compton polarimeter at JLEIC

The JLAB EIC (JLEIC) design includes a chicane after the interaction point to detect electron associated with production of quasi-real photon at the interaction. This chicane layout can also be used for Compton polarimetry to measure the electron beam polarization. This proceeding will present the layout of the low Q^ 2 chicane and the implementation and current R&D of a Compton polarimeter which would be located in the middle of this chicane.

Camsonne, Alexandre↗

DOE OSTI2018

Geometry tagging for heavy ions at JLEIC

Geometry tagging is an experimental analysis technique for selecting event samples where one can, on a statistical basis, control the geometry of the collision in order to make more incisive physics measurements. Several physics measurements at the EIC would benefit significantly from the use of this technique, including studies of gluon anti-shadowing, studies of parton propagation, attenuation and hadronization in the nucleus, and ultimately the search for parton saturation. The JLEIC full-acceptance detector, with full acceptance to forward-going neutrons, protons and nuclear fragments and a high data-taking rate is ideally suited to such geometry tagging. We improve, tune, and apply existing modeling codes, BeAGLE, Sartre, and GEMC, and detector descriptions to study this physics.

Morozov, Vasiliy↗

DOE OSTI2016

Error Correction for the JLEIC Ion Collider Ring

The sensitivity to misalignment, magnet strength error, and BPM noise is investigated in order to specify design tolerances for the ion collider ring of the Jefferson Lab Electron Ion Collider (JLEIC) project. Those errors, including horizontal, vertical, longitudinal displacement, roll error in transverse plane, strength error of main magnets (dipole, quadrupole, and sextupole), BPM noise, and strength jitter of correctors, cause closed orbit distortion, tune change, beta-beat, coupling, chromaticity problem, etc. These problems generally reduce the dynamic aperture at the Interaction Point (IP). According to real commissioning experiences in other machines, closed orbit correction, tune matching, beta-beat correction, decoupling, and chromaticity correction have been done in the study. Finally, we find that the dynamic aperture at the IP is restored. This paper describes that work.

Wei, Guohui↗