d. trbojevic, n. tsoupas, s. tepikian, b. parker, e. pozdeyev, y. hao, d. kayran, j. beebe-wang, c....
DESCRIPTION
Recirculation passes in eRHIC design At present design of eRHIC the beam passes the main linac five times during acceleration. Four of the beam recirculation passes will be placed in the tunnel. Lower energy pass can be put locally. Possible location of the recirculation passes in the tunnel Four recirculation passes PHENIX STAR e-ion detector eRHIC Main ERL (1.9 GeV) Low energy recirculation pass Beam dump Electron source Possible locations for additional e-ion detectors Dejan Trbojevic EIC-Stony Brook, January 10-12, 20103TRANSCRIPT
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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 Lattices and Interaction Regions
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eRHIC and MeRHIC Lattice and Interaction Regions
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010 2
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Recirculation passes in eRHIC designAt present design of eRHIC the beam passes the main linac five times during acceleration. Four of the beam recirculation passes will be placed in the tunnel. Lower energy pass can be put locally.
Possible location of therecirculation passes in the tunnelFour recirculation
passes
PHENIX
STAR
e-ion detector
eRHIC
Main ERL (1.9 GeV)
Low energy recirculation pass
Beam dump
Electronsource
Possible locationsfor additional e-ion detectors
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010 3
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Previous work on asynchronous lattice (1997)
1997 Particle Accelerator Conference, Vancouver, B.C., Canada, 5/12-16/97, “A Proton Driver for the Muon Collider Source with a Tunable Momentum Compaction Lattice”, D. Trbojevic et. all.
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FMC cell (D. Trbojevic)Dipole filling factor: 54%Reduced lengthTuned to ~0 momentum compaction
For 10GeV:Largest gradient: 7.7 T/mDipole field: 0.16 T
Dipole length: 5.5 mQuad length: 0.6 m
81 m
Basic cell for the arcs
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Separated functions:• R56 tuning: arcs• Phase trombone: straights• Path length tuned: in area of IR insertion (IR12)
One sextant with asynchronous cells
Arc and straights with no IR
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Interaction Straight Layout
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
-100 -50 0 50 100
H-plane V-plane
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
-100 -50 0 50 100
Presently considered geometry of the interaction region straight.Ongoing work on the optics to minimize (or eliminate) dispersion at the IP.
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Second high-Luminosity IR in eRHIC for Q2 detector using just built magnets
from US LARP Magnet Program
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New eRHIC IR designs with b*=5 cmwith the triplet magnets 4.5 m away from the IP.This is for different Q2 physics.
Examining two ways for the chromaticity corrections:1. With zero dispersion at the IP
but non-zero slope of dispersion
2. With zero dispersion and zero slope at the IP.
Quadrupole magnets have gradients of 200 T/m and are 1.6 m, 1 m and 0.85 long.
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Second high-Luminosity IR in eRHIC for Q2 detector using just built magnets
from US LARP Magnet Program
0.5 mm
Large aperture, Nb3Sn Quadrupoles for LHC Upgrade
90 mmG > 250 T/m
High PerformanceConductor Development
LengthScale-up
Steve Gourlay
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Assembled LHC triplet
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RHIC lattice for the present Au-Au run 2010
Dispersion at the IP is zero with non-zero slope. The Dx ~1.5m at the triplets.
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Chromaticity correction in RHIC with the IR sextupoles
sextupoles in triplets ON
Chromatic correction in the arcsextupoles strength is reduced
improvedlifetime
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Present RHIC lattice with b*=0.6 m
Chromaticities:xx=-109.39 = (dnx/nx)/(dp/p)xy=-108.23requires correction with 32 A of 100 A maximum for ‘defocusing’ sextupoles, and half for the ‘focusing’ sextupoles
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Methods of correcting the IP chromaticities
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4.5 m
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RHIC lattice with b*=0.05 m
Chromaticities:xx=-109.39 = (dnx/nx)/(dp/p)xy=-108.23requires correction with 32 A of 100 A maximum for ‘defocusing’ sextupoles, and half for the ‘focusing’ sextupoles
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010 19
CIRCUMFERENCE = 3833.845 M qX = 6.283185307 RAD nx = 28.8200 xx= -161.81595 RADIUS = 610.1755 M qy = 0.00000000 RAD ny = 26.8100 xy= -165.90281
a =(DS/S)/(DP/P)= 0.0016825 TGAM=( 24.37951, 0.00000)
MAXIMA --- bX ( 1261) = 2184.13229 by ( 1230) = 1733.92123 Dx= 2.92783 MINIMA --- bX ( 1247) = 0.050000 by ( 1247) = 0.050000 Dx= -3.11372
CHROMATICITY AFTER SEXTUPOLE CORRECTIONS xx= 0.00000 xy= 0.0000
AMPLITUDE DEPENDENCE OF TUNES DUE TO SEXTUPOLES nx= 28.820000 + 1630 * ex - 6570 * ey ex ~ ex = 0.2 mm mrad Dnx=0.000326 ny= 26.810000 – 6570 * ex + 3550 * ey
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MeRHIC - Lattice and IR
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Lattice design of the MeRHIC:- RHIC modification – Steven Tepikian- Lattice of the Energy recovery linac– Eduard Pozdeyev- Asynchronous arcs and IP – Dmitri Kayran, Dejan Trbojevic- Vertical splitters – Nicholaus Tsoupas- IP and detector protection: J. Beebe-Wang
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© J.C.Brutus, J. Tuozzolo, D. Trbojevic, G. Mahler, B. Parker, W. Meng
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22
Linacs, spreaders, and an arc
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Magnets: Preliminary Design
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Switchyard at the linac
4GeV
0.1GeV
1.4GeV
2.7GeV0.
2458
m
2.8423 m
1.25 m
0.55 m
0.16
m0.
16 m
1.866 m
0.70
2 m
0.13
6 m
Q4g3
D4g3
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Switchyard at the linac
4GeV
0.1GeV1.4GeV2.7GeV0.
16
1.866 m
Q4g3hb2u hb3
uqu4fqu5
dD4g4uqu3d
qu2f
qu1d
hb4u
hbdu hb1u
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Vertical splitters – Nicholaus Tsoupas
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RHIC lattice modification – Joanne-Beebe Wang
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RHIC lattice modification – Steven Tepikian
b*~0.4 m
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Requirements for the Energy Recovery Linac:• Geometrical constraints: If it is possible use the existing interaction region at RHIC 2
o’clock and wider tunnel to place the superconducting linac inside it. Minimize civil construction cost:
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Zero dispersion IP and detector
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One Flexible Momentum Compaction Cell:
QF/2QF3
QDQF/2
QD3 QD3
QD
QF3
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Asynchronous arcs: 3.35 GeV Betatron Functions Dmitri Kayran, Dejan Trbojevic
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Asynchronous arcs: 4.00 GeV Dmitri Kayran, Dejan Trbojevic
R=8.88 m
R=12
.3 m
LBL= 1.55 mBy = 1.502397853 Tq = 0.174532925 rad
27.8
9612
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Summary:
• Lattice design of the eRHIC and MeRHIC is complete.
• eRHIC:• High Luminosity RHIC lattice – The dynamical
aperture – many turn tracking studies of the RHIC lattice with b*=5 cm are in progress.
• Arc asynchronous lattice with splitters is completed.
• IR designs for large angle IP and high luminosity are in progress.
• Arc magnets samples are already built.
• MeRHIC: • Complete design and layout of the multi-pass
electron and accommodations of the RHIC lattices are completed.
• Preliminary magnet design is completed.• Detail cost estimate of the 4 GeV Medium electron
– ion collider is completed
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