Y Hao D Kayran J BeebeWang C Montag V Ptitsyn and V Litvinenko eRHIC and MeRHIC Lattices and Interaction Regions eRHIC and MeRHIC Lattice and Interaction Regions Dejan Trbojevic EICStony Brook January 1012 2010 ID: 487820
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Slide1
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 RegionsSlide2
eRHIC and MeRHIC Lattice and Interaction Regions
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
2Slide3
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 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, 2010
3Slide4
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.
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
4Slide5
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 m
Quad length: 0.6 m
81 m
Basic cell for the arcs
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
5Slide6
Separated functions:R
56 tuning: arcsPhase trombone: straights
Path length
tuned:
in
area of IR insertion (IR12)
One sextant with asynchronous cellsArc and straights with no IR
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
6Slide7
Interaction Straight LayoutH-plane
V-plane
Presently considered geometry of the interaction region straight.
Ongoing work on the optics to minimize (or eliminate) dispersion at the IP.
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
7Slide8
Second high-Luminosity IR in eRHIC for Q2 detector using just built magnets from US LARP Magnet Program
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
8
New
eRHIC
IR designs with
b
*
=5 cm
with the triplet magnets 4.5
m
away from the IP.
This is for different Q
2
physics.
Examining two ways for the chromaticity corrections:
With zero dispersion at the IP but non-zero slope of dispersion
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. Slide9
Second high-Luminosity IR in eRHIC for
Q2 detector using just built magnets
from
US
LARP Magnet Program
Large aperture, Nb
3
Sn Quadrupoles for LHC Upgrade
90 mm
G >
250 T/m
High Performance
Conductor Development
Length
Scale-up
Steve Gourlay
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
9Slide10
Assembled LHC triplet
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
10Slide11
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
11
RHIC lattice for the present Au-Au run 2010
Dispersion at the IP is zero with non-zero slope. The
D
x
~1.5m at the triplets.Slide12
Chromaticity correction in RHIC with the IR sextupoles
sextupoles in triplets ON
Chromatic correction in the arc
sextupoles strength is reduced
improved
lifetime
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
12Slide13
Present RHIC lattice with b*=0.6 mChromaticities:x
x=-109.39 = (dnx/n
x
)/(d
p/p
)x
y=-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
13Slide14
Methods of correcting the IP chromaticitiesDejan Trbojevic EIC-Stony Brook, January 10-12, 2010
14Slide15
4.5 m
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
15Slide16
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
16Slide17
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
17Slide18
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
18Slide19
RHIC lattice with b*=0.05 mChromaticities:xx=-109.39 = (dnx
/nx)/(d
p/p
)
x
y=-108.23requires correction with 32 A of 100 A maximum for ‘defocusing’ sextupoles,
and half for the ‘focusing’ sextupolesDejan Trbojevic EIC-Stony Brook, January 10-12, 2010
19
CIRCUMFERENCE = 3833.845 M
q
X
= 6.283185307 RAD
n
x
= 28.8200
x
x
= -161.81595
RADIUS = 610.1755 M q
y = 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 --- b
X ( 1247) = 0.050000 b
y ( 1247) = 0.050000 D
x= -3.11372 CHROMATICITY AFTER SEXTUPOLE CORRECTIONS x
x= 0.00000 xy= 0.0000
AMPLITUDE DEPENDENCE OF TUNES DUE TO SEXTUPOLES n
x= 28.820000 + 1630 * ex
- 6570 * ey
ex ~
ex = 0.2 mm mrad
Dnx=
0.000326 ny
= 26.810000 – 6570 * ex + 3550 *
eySlide20
MeRHIC - Lattice and IR
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
20
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-WangSlide21
© J.C.Brutus, J. Tuozzolo, D. Trbojevic,
G. Mahler, B. Parker, W. Meng
21
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
21Slide22
22Linacs, spreaders, and an arc
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
22Slide23
Magnets: Preliminary Design
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
23Slide24
Switchyard at the linac
4GeV
0.1GeV
1.4GeV
2.7GeV
0.2458 m
2.8423 m
1.25 m
0.55 m
0.16 m
0.16 m
1.866 m
0.702 m
0.136 m
Q4g3
D4g3
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
24Slide25
Switchyard at the linac
4GeV
0.1GeV
1.4GeV
2.7GeV
0.16
1.866 m
Q4g3
hb2u
hb3u
qu4f
qu5d
D4g4u
qu3d
qu2f
qu1d
hb4u
hbdu
hb1u
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
25Slide26
Vertical splitters – Nicholaus Tsoupas Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
26Slide27
RHIC lattice modification – Joanne-Beebe Wang
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
27Slide28
RHIC lattice modification – Steven Tepikianb*
~0.4 m
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
28Slide29
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:
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
29Slide30
Zero dispersion IP and detector
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
30Slide31
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
31Slide32
One Flexible Momentum Compaction Cell:QF/2
QF3
QD
QF/2
QD3
QD3
QD
QF3
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
32Slide33
Asynchronous arcs: 3.35 GeV Betatron Functions Dmitri Kayran, Dejan Trbojevic
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
33Slide34
Asynchronous arcs: 4.00 GeV Dmitri Kayran, Dejan Trbojevic
R=8.88 m
R=12.3 m
L
BL
= 1.55 m
B
y
= 1.502397853 T
q
= 0.174532925 rad
27.89612 m
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
34Slide35
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
Dejan Trbojevic EIC-Stony Brook, January 10-12, 2010
35