Bob Lambiase May 21, 2012. The purpose of eRHIC is to have the capability to collide heavy ions with leptons, such as electrons and polarized electrons.

Slides:



Advertisements
Similar presentations
Beam Dynamics in MeRHIC Yue Hao On behalf of MeRHIC/eRHIC working group.
Advertisements

Chris Tennant Jefferson Laboratory March 15, 2013 “Workshop to Explore Physics Opportunities with Intense, Polarized Electron Beams up to 300 MeV”
1 Methods of Experimental Particle Physics Alexei Safonov Lecture #8.
Note: most of the slides shown here are picked from CERN accelerator workshops. Please refer to those workshop for further understanding of the accelerator.
Cooling Accelerator Beams Eduard Pozdeyev Collider-Accelerator Department.
Recirculating pass optics V.Ptitsyn, D.Trbojevic, N.Tsoupas.
ERHIC Main Linac Design E. Pozdeyev + eRHIC team BNL.
1 Low-energy RHIC electron Cooler (LEReC) Update November 17, 2014.
MeRHIC Design V.Ptitsyn on behalf of MeRHIC Design team: M. Bai, J. Beebe-Wang, I. Ben-Zvi, M. Blaskiewicz, A. Burrill, R. Calaga, X. Chang, A. Fedotov,
Scientific Goals: V. Litvinenko’s RHIC retreat talk Commissioning Goals: I. Pinayev presentation last week Run 14 Goals: Complete assembly of 112 MHz SCRF.
Electron and Ion Spin Dynamics in eRHIC V. Ptitsyn Workshop on Polarized Sources, Targets and Polarimetry Charlottesville, VA, 2013.
(ISS) Topics Studied at RAL G H Rees, RAL, UK. ISS Work Areas 1. Bunch train patterns for the acceleration and storage of μ ± beams. 2. A 50Hz, 1.2 MW,
Thomas Roser RHIC Open Planning Meeting December 3-4, 2003 RHIC II machine plans Electron cooling at RHIC Luminosity upgrade parameters.
Joseph Tuozzolo EIC Stony Brook University January 10, 2010 MeRHIC Engineering Challenges and Solutions for MeRHIC.
The LHC: an Accelerated Overview Jonathan Walsh May 2, 2006.
Storage Ring : Status, Issues and Plans C Johnstone, FNAL and G H Rees, RAL.
18 th International Spin Physics Symposium Polarized Beams at EIC V. Ptitsyn.
1 Low-energy RHIC electron Cooler (LEReC) cost estimate December 2, 2014.
EIC Meeting, Stony Brook University, January 10, 2010 Dmitry Kayran for MeRHIC group EIC Meeting January , 2010 MeRHIC: Injection System.
Workshop on High Average Power & High Brightness Beams UCLA, Los Angeles, CA, November 8 – 10, 2004 D. Kayran, I. Ben-Zvi, D.S. Barton, D. Beavis, M. Blaskiewicz,
Synchrotron radiation at eRHIC Yichao Jing, Oleg Chubar, Vladimir N. Litvinenko.
ERHIC: an Efficient Multi-Pass ERL based on FFAG Return Arcs June 9, 2015Stephen Brooks, ERL On behalf of the eRHIC design team.
CASA Collider Design Review Retreat HERA The Only Lepton-Hadron Collider Ever Been Built Worldwide Yuhong Zhang February 24, 2010.
Scaling VFFAG eRHIC Design Progress Report 4 July 15, 2013Stephen Brooks, eRHIC FFAG meeting1.
1 Studies of electron cooling at DESY K. Balewski, R. Brinkmann, Ya. Derbenev, Yu. Martirosyan, K. Flöttmann, P. Wesolowski DESY M. Gentner, D. Husmann,
Low Energy RHIC e - Cooling Meeting Minutes – 11/19/14 1. Cooling Section Magnets and Power Supplies –Most of power supplies will be from ERL (R. Lambiase).
First Thoughts on IDS G H Rees, RAL. Topics 1.Two-way, μ ± injection chicane for the dog-bone RLA. 2.Injection energy & efficiency for a first dog-bone.
ERHIC Conceptual Design V.Ptitsyn, J.Beebe-Wang, I.Ben-Zvi, A.Fedotov, W.Fischer, Y.Hao, V.N. Litvinenko, C.Montag, E.Pozdeyev, T.Roser, D.Trbojevic.
September 19-20, 2007 R. Lambiase Power Supplies Bob Lambiase September 19-20, 2007 DOE Annual Review.
Aug 23, 2006 Half Current Option: Impact on Linac Cost Chris Adolphsen With input from Mike Neubauer, Chris Nantista and Tom Peterson.
ERHIC design status V.Ptitsyn for the eRHIC design team.
Low Energy RHIC e - Cooling Meeting Minutes – 11/5/14 1.J. Tuozzolo will schedule a visit to NSLS next week to evaluate available magnets, power supplies,
BROOKHAVEN SCIENCE ASSOCIATES Electron Cooling at RHIC Enhancement of Average Luminosity for Heavy Ion Collisions at RHIC R&D Plans and Simulation Studies.
FFAG Studies at RAL G H Rees. FFAG Designs at RAL Hz, 4 MW, 3-10 GeV, Proton Driver (NFFAGI) Hz,1 MW, GeV, ISIS Upgrade (NFFAG) 3.
October, 2009 Magnet Electrical Systems Bob Lambiase October, 2009 Internal Review.
Design Optimization of MEIC Ion Linac & Pre-Booster B. Mustapha, Z. Conway, B. Erdelyi and P. Ostroumov ANL & NIU MEIC Collaboration Meeting JLab, October.
Thomas Roser EIC AC meeting November 3-4, 2009 EIC Accelerator R&D Strategy and Programs Thomas Roser/Andrew Hutton BNL / Jefferson Lab R&D program is.
D. Trbojevic, N. Tsoupas, S. Tepikian, B. Parker, E. Pozdeyev, Y. Hao, D. Kayran, J. Beebe-Wang, C. Montag, V. Ptitsyn, and V. Litvinenko eRHIC and MeRHIC.
R.Chehab/ R&D on positron sources for ILC/ Beijing, GENERATION AND TRANSPORT OF A POSITRON BEAM CREATED BY PHOTONS FROM COMPTON PROCESS R.CHEHAB.
MeRHIC Internal Cost Review October, Dmitry Kayran for injector group MeRHIC Internal Cost Review October 7-8, 2009 MeRHIC: Injection System Gun.
Future Circular Collider Study Kickoff Meeting CERN ERL TEST FACILITY STAGES AND OPTICS 12–15 February 2014, University of Geneva Alessandra Valloni.
“2:1” Scaled eRHIC FFAG Design Featuring ≤30T/m quadrupoles August 18, 2014Stephen Brooks, eRHIC FFAG meeting1.
Development of High Current Bunched Magnetized Electron DC Photogun MEIC Collaboration Meeting Fall 2015 October 5 – 7, 2015 Riad Suleiman and Matt Poelker.
P OSSIBILITIES FOR MAINTAINING AA AND PP CAPABILITIES IN PARALLEL WITH E RHIC V. Ptitsyn Collider-Accelerator Department BNL RHIC and AGS Users Meeting,
Experience with Novosibirsk FEL Getmanov Yaroslav Budker INP, Russia Dec. 2012, Berlin, Germany Unwanted Beam Workshop.
ApEx needs for CeC PoP Experiment December 11, 2015.
Powering The RHIC EBIS at BNL (And a few words on other new projects within the Collider –Accelerator Dept.) Bob Lambiase 16 June 2019.
Powering New Projects at Brookhaven National Laboratory Bob Lambiase 5 th Workshop on Power Converters for Particle Accelerators 24 – 26 May 2016.
eRHIC Design and R&D From RHIC to eRHIC
BEAM TRANSFER CHANNELS, INJECTION AND EXTRACTION SYSTEMS
Warm magnets for LHeC / Test Facility arcs
eRHIC FFAG Lattice Design
Arc magnet designs Attilio Milanese 13 Oct. 2016
R&D Topics for FOA Funding Proposals
Large Booster and Collider Ring
Electron Polarization In MEIC
Magnetized Bunched Electron Beam from DC High Voltage Photogun
eRHIC with Self-Polarizing Electron Ring
CASA Collider Design Review Retreat Other Electron-Ion Colliders: eRHIC, ENC & LHeC Yuhong Zhang February 24, 2010.
Performance Degradation cERL Injector Cryomodule
ERL accelerator review. Parameters for a Compton source
LHC (SSC) Byung Yunn CASA.
Collider Ring Optics & Related Issues
R. Suleiman and M. Poelker September 29, 2016
Why CeC is needed? High luminosity of US future electron-ion collider(EIC) is critical for success of its physics program 2018 NAS Assessment of U.S.-Based.
CEPC Collider Magnets CHEN, Fusan November 13, 2018.
Electron Collider Ring Magnets Preliminary Summary
Main Design Parameters RHIC Magnets for MEIC Ion Collider Ring
HE-JLEIC: Do We Have a Baseline?
Status of RCS eRHIC Injector Design
Presentation transcript:

Bob Lambiase May 21, 2012

The purpose of eRHIC is to have the capability to collide heavy ions with leptons, such as electrons and polarized electrons. To do this, an accelerator is added to the 2.48 mile (4 km) RHIC tunnel that can accelerate electrons to 30 GeV. The electron rings use Energy Recovery LINACs (ERLs) in both the pre- accelerator and the main ring. In the pre-accelerator, the ERL reduces the amount of RF energy required to accelerate the high current beam to 0.6 GeV, as well as reducing the amount of energy the beam dump must absorb. The ERLs in the main arcs deliver consistently high quality (luminosity) beam to the experiment. Prior to the collision, the electron beam has only traveled six times around the RHIC tunnel. Then, that beam has only one collision per experiment before having its energy recycled and dumped at low energies. The luminosity of the heavy ion beam will be maintained by a Coherent e-Cooler (CeC). The CeC uses the interaction between the heavy ion beam and another electron beam. I will present one design for eRHIC. Other designs are actively being explored.

e-Gun – Multiple cathode polarized source, 50 mA at 10 MeV Pre-injector – 10 MeV to 0.6 GeV Main LINACs – Each increase or decrease the beams by 2.45 GeV per pass. Combiner / Spreader – Combines all six beams to enter LINAC, then spreads them out to individual beam lines. Main Arc Magnets – Six separate rings, one for each energy. Bypass Lines – Lower energy lines separate from 30 GeV line to bypass experimental area. Delay Lines – Vertically bent beams to equalize time of flight around rings. IR-8 Experimental Magnets – Superconducting magnets define interaction. Coherent e-Cooler – Maintains luminosity of the heavy ion beam. Graphic: V. Litvinenko

The cathodes operate at -250 kV. A low power electrode floats at 20 kV on top of the cathode potential. It is planned to operate two of these is e-RHIC, switching them once per week, allowing maintenance. Twenty cathodes are arranged in a circular pattern. Each cathode is laser energized at a 700 kHz rate. By sequencing the 20 cathodes, beam pulses are produced at a 14 MHz rate. The combiner has both dipole and quadrupole windings. The dipole windings require 81 Amps at 3.5 kV, and about 120 W of losses. A resonating capacitor will be used to provide the reactive power. Graphic: X. Chang

The ERL reduces the amount of RF energy required to accelerate the high current beam to 0.6 GeV, as well as reducing the amount of energy the beam dump must absorb. The U-turn in the beam line to eRHIC uses combined function magnets with quadrupole trim winding. Pre-Accelerator Graphic: © D. Kayran, X. Chang

Each magnet the spreader or combiner is individually powered. That means two things. First, there is a large number of units required. For all four parts, 150 power converts are needed. Second, since the loads are single magnets, they are relatively low impedance. Together, these two items mean these converters are costly and consume a lot of power. The combiner at 2:00 is shown. These magnets combine the beams from the six rings as well as the 0.6 GeV line from the pre-accelerator. The splitter at 10:00 is the mirror image of this. At 10:00, the 0.6 GeV line feeds the beam line that returns to the electrons to the pre- accelerator ERL. The splitter at 2:00 and the combiner at 10:00 are similar, but do not have a 0.6 GeV line.

There is always an interaction between the magnet designer and the converter designer. Initially the dipole magnets were single turn and the quads had two turns. Even if the magnet has greater losses by increasing the number of turns, the net system losses can be much lower if the interconnection distances are long. In eRHIC, we are connecting magnets six times around the ring (6 x 4 = 24km) plus trips back and forth to the equipment buildings. Multiplying the number of turns on the dipoles and quads increased the power in the magnet by 44%, due to insulation reducing available cross section, and because the cooling channels did not scale with the conductor size. But the net energy savings were more than a factor of two.

The bypass and delay lines span the regions between the arcs. There is a straight bypass line at 12:00, where there is no immediate plans for an experiment, a pass through bypass line at 6:00 (shown below) with provisions for an experiment, and a bypass line at 8:00 where additional magnets are inserted into the 30 GeV line. The delay line is in the 4:00 region. The region between the arcs at 2:00 and 10:00 are filled the main LINACs and the spreaders and combiners. The blue boxes represent a basic quadrupole block, as configured in the main arcs. Similarly, the red blocks represent a basic dipole block (seven dipoles with correctors), as configured in the main arcs. Five beam lines are bent one way, and the sixth is bent another way.

The interaction region at 8:00 is the only place we’re adding superconducting magnets. Superconducting magnets are required here because they are needed to control the heavy ion beam. We’ve considered both superconducting links (which is how we power the rest of RHIC) and warm bus, and right now warm bus seems to be the most economical. One of the interesting features of this region are the septum quads. The electron beam travels through a hole in the laminations. Compensation windings are used to null out any fields that might exist in that channel. Except for the Compensation and trim windings, the mirror image magnets will be powered in series. For the larger superconducting windings, that will require a central quench protection assembly (QPA). There are also warm magnets in this interaction region. These are used to move the beam into place and pass it though the septum magnets. MagnetFunction# of Windings I, Amps Q1 6.2T Combined Function Septum Combined Function 11,600 Q2 90mm, 200 T/m LARP-like Septum Quad Quadrupole 120,000 Compensation 3600 Trim 290 Q3 120 mm, 200 T/m LARP-like Septum Quad Quadrupole 120,000 Compensation 3600 Trim 290 BON DX-like Dipole, Shielded Penetration Through SS Collars. Dipole 14,500 Trim 290

This diagram shows how CeC is built for collisions of two heavy ion beams. For eRHIC, only one of these coolers would be used. But the graphic shows all the elements. To cool the blue beam, we start at electron Gun 1. These electrons are accelerated in the ERL using the energy from the previous beam. It then merges with the blue ion beam in the modulator region. Here the ion beam modulates the electrons. The electron and ion beams are separated. The electron beam passes through a permanent magnet FEL, where the modulation is amplified. Then the electron beams are recombined, where the highly modulated electrons cool the ion beam. After that, the electron beam separates from the ion beam where its energy is returned to the ERL, and is deposited in Beam dump 1. Graphic: I. Pinayev