Status of and planned facilities for Nuclear Physics in Korea

Report
08. 17. 2012
The Rare Isotope Science Project
a.k.a. KoRIA
IUPAP 2012 (Japan)
Dong-O Jeon
The Institute for Basic Science
Brief History of IBS
• International Science Business Belt plan (2009.1)
• The Institute for Basic Science is the core facility of the
ISBB plan
• Under the IBS, a heavy ion accelerator facility is built –
The Rare Isotope Science Project
• Preliminary Design Study (2009.3 - 2010.2)
• Conceptual Design study (2010.3 - 2011.2)
• International Advisory Committee (2011.7)
• Institute for Basic Science(IBS) established (2011.11)
• Rare Isotope Science Project(RISP) launched (2011.12)
• Technical Advisory Committee (2012.5)
• Baseline Design Summary (2012.6)
• International Advisory Committee (2012.7)
Organization of
the Institute for Basic Science
Board of Directors
Auditor
Scientific Advisory Board
President
Accelerator Institute
(Affiliated Institution)
Office of
Policy Planning
Secretariats
Rare Isotope Science Project
Research Center
(Headquarters)
Office of
Research Services
Research Center
(Campus)
Research Center
(Extramural)
Office of Administrative
Services
IBS consists of 50 research centers, supporting organizations, and affiliated research institutes
Each Research Center : ~50 staff, average annual budget ~ 9 M USD
The number of staff: 3,000 (2017, including visiting scientists and students)
Annual Budget: USD 610 million (2017, including operational cost for the Accelerator Institute)
4
Location
Daejeon
Bird Eye View of IBS
Bird’s Eye View of
Accelerator Facility
Bird’s Eye View of
Accelerator Facility
Making Rare Isotope Beams
ISOL(Isotope Separator On-Line)
p  thick target (eg. Uranium Carbide)  target spallation or fission (low energy)
RI Ions
Reacceleration
RI Beam
Cyclotron
Proton 70 MeV, 70 kW
Driver LINAC
Heavy ion
e.g. U : 200MeV/u, 200 kW
Stopping
RI ion beam
IF(In-Flight Fragmentation)
Stable Heavy ion beam  thin target  projectile fragmentation (high energy)
Stopped Beam
Experiment
(Traps)
Fast Beam
Experiment
Accelerator System
• Main Driver Superconducting Linac
LEBT
with 400 kW beam power
ECR-IS ( 10keV/u, 12 pμA)
RFQ (300keV/u, 9.5 pμA)
• Cyclotron 70 MeV 1 mA p beam as
ISOL driver
MEBT
• Post Accelerator to accelerate RI
beams
SCL1 (18.5 MeV/u, 9.5 pμA)
Driver Linac
Chg.
Stripper
SCL2 (200 MeV/u, 8.3 pμA for U+79)
(600MeV, 660 μA for p)
MEBT
RFQ
CB
HRMS
ISOL
Target
μSR, Medical
Cyclotron
RF Cooler (p, 70 MeV, 1mA)
SCL1 (Post Acc.)
IF Target
IF system
IF Separator
Post Accelerator
Atomic Trap
ECR-IS
ISOL system
Gas Catcher
Accelerator System
Beam Parameters of Accelerator System
Accelerator
Driver Linac
Post Acc.
RI beam
Cyclotron
Particle
proton
U+79
proton
Beam energy
600 MeV
200 MeV/u 18.5 MeV/u 70 MeV
Beam current
660μA
8.3 pμA
-
1 mA
Power on target
400 kW
400 kW
-
70 kW
Driver Linac
Injector
LEBT
ECR-IS ( 10keV/u, 12 pμA)
RFQ (300keV/u, 9.5 pμA)
MEBT
SCL1
SCL1 (18.5 MeV/u, 9.5 pμA)
• Main Driver Linac with 400 kW
beam power
• Accelerates from proton (600
MeV) to uranium (200 MeV/u)
• Designed for high intensity beams
• Send beam to the IF target or
ISOL target
Driver Linac
Chg.
Stripper
SCL2 (200 MeV/u, 8.3 pμA for U+79)
(600MeV, 660 μA for p)
MEBT
RFQ
CB
SCL2
HRMS
ISOL
Target
μSR, Medical
Cyclotron
RF Cooler (p, 70 MeV, 1mA)
SCL1 (Post Acc.)
IF Target
IF system
IF Separator
Post Accelerator
Atomic Trap
ECR-IS
ISOL system
Gas Catcher
ECR Ion Source
• Consists of 28 GHz RF system and
superconducting magnets for high
current ion beam generation
• X-ray shielding required
• High temp oven under design
• Generating 12 pmA (U beam)
Superconducting
Magnet
ECR-IS
Ion Beam
Proton to Uranium beam
Extraction Energy
10 keV/u
RF power
10 kW
Extraction Emittance
0.1π mm-mrad
Beam Current
12 puA (238U33+, 238U34+)
RF Frequence
28GHz
RFQ
RFQ is
• To accelerate ion beams from 10 keV/u to 300 keV/u
• 4 m long, 81.25 MHz
RFQ
Input Energy
10 keV/u
Output Energy
300 keV/u
Input Emittance (rms)
0.12π mm-rad
Frequency
81.25 MHz
Input charge
33, 34 (Uranium-238)
Input current
12 pμA
Output current
9.5 pμA
RFQ
Transmission : 80.5%
•
•
•
•
ex=0.12 mm-mrad, ey=0.18 mm-mrad, ez=8.2 MeV-deg @ exit of RFQ
With LEBT bunchers (TRACK code)
Accelerate ion beams 10 keV/u to 300 keV/u
Assessing available options.
Driver SCL
SCL is designed
• To accommodate the needs of various user groups
• To accelerate high intensity beams
• Nb Cavities operating at 2K
• Focusing by normal conducting quad doublets
• Optimized geometric beta of SC cavities (0.047, 0.12,
0.30, 0.53)
• Employs larger aperture to reduce beam loss (4cm
and 5 cm aperture)
• Cryogenic load estimated 1.9 kW [Driver Linac 2K] +
0.35 kW [Post Acc]
• Cavity geometry optimized for Epeak/Eacc , Bpeak/Eacc ,
R/Q, QRs
Cavity Geometric Beta Optimization
SSR2
SSR1
QWR
HWR
RISP: 0.047, 0.120, 0.30, 0.53
16
For U beam
Cavity Geometry Optimized
Parameters
Unit
QWR
HWR
SSR 1
SSR 2
bg
-
0.047
0.12
0.30
0.53
Resonant frequency
MHz
81.25
162.5
325
325
No of cavities
-
24
138
88
136
Aperture diameter
mm
40
40
50
50
QRs
Ohm
37
47
86
108
R/Q
Ohm
480
319
242
304
Vacc
MV
1.02
1.07
2.04
3.53
Epeak
MV/m
30
30
30
30
Bpeak
mT
48
41
54
57
Epeak/Eacc
5.08
6.2
4.06
4.15
Bpeak/Eacc
9.16
8.4
7.07
8.6
Qcalc/109
-
3.6
4.6
8.1
10
Operating temperature
K
2
2
2
2
P0
W
1.3
1.5
4.7
7.9
Pbeam / emA (proton)
W
854
925
1440
2770
Pbeam / emA (Uranium)
W
113
134
524
926
Average charge state (U)
-
33.5
33.5
79
79
SCL Layout
• Linac base frequency = 81.25 MHz
• Design to accelerate high intensity ion beams
• Flexile operation to meet the needs of various user groups
SC Cavity
QWR1
1m
QWR
Focusing solenoids
QWR2
18
HWR1 Driver SCL Design
Previous
with SC solenoids
SC cavity
NC quadrupole
beam box
HWR
Driver SCL
with NC doublets
SCL Layout
NC quadrupole lattice option has the following merits:
1. Accurate alignment < 150 mm of NC quadrupoles is
straightforward.
2. Beam quality control is straightforward and design is
more adequate for high power beam operation.
3. Advantages in beam diagnostics and collimation
through beam boxes.
4. The linac cost seems to be in error range compared
with the SC solenoid option. ( removal of costly SC
solenoids)
5. Preliminary cryo-load comparison suggests that
overall cryo-load difference is small compared with the
dynamic load.
SCL Layout
• Present SCL layout provides good beam diagnostics
configuration for machine tuning.
• Necessary beam diagnostics can be installed at beam
boxes.
• Also provides good beam loss collimation configuration,
improving beam quality for users, reducing beam loss.
Beam
Beam loss
cryomodule
quadrupole
beam box
collimator
SCL Layout
[1 QWR + 1 QD] x 24
SCL1
[3 HWR + 1 QD] x 14
[6 HWR + 1 QD] x 16
[4 SSR + 1 QD] x 22
SCL2
beam box example
(courtesy of SPIRAL2)
[8 SSR + 1 QD] x 17
SCL
SCL1
SCL2
Cavity
structure
Frequency
βg
Number of
cavities
Output energy
QWR
81.25 MHz
0.047
24
2.5 MeV/u (U+33)
HWR
162.5 MHz
0.12
138
18.6 MeV/u (U+33)
SSR
325 MHz
0.30
88
71 MeV/u (U+79)
SSR
325 MHz
0.53
136
200 MeV/u (U+79)
SCL machine tolerance
(Driver SCL, Post SCL)
Machine imperfections for actual accelerator
Parameters
SCRF
Cavity
Warm
Quadrupole
SC
Solenoid
Displacement (mm)
±1
±0.15
±0.5
Uniform
-
±5
-
Uniform
Phase (deg)
±1
-
-
3σ Gaussian
Amplitude (%)
±1
-
-
3σ Gaussian
Rotation (mrad)
Distribution
• Preliminary study is done.
• Further studies on machine tolerances will be done.
SCL machine tolerance
Max. envelope
Centroid
Emittance
76% increase
10% increase
baseline
350% increase
130% increase
solenoid


The shade region represents the bounds of envelope, centroid
and emittance due to misalignment and field errors.
The aperture of quadrupole and solenoid is 4 cm.
Cyclotron
LEBT
ECR-IS ( 10keV/u, 12 pμA)
RFQ (300keV/u, 9.5 pμA)
MEBT
SCL1 (18.5 MeV/u, 9.5 pμA)
• Cyclotron – 70 MeV, 1 mA, proton
beam
• Supports CW and pulsed beam
• Pulsed beam by fast chopping
system
• Driver for the ISOL target
• Will be procured through bidding
Driver Linac
Chg.
Stripper
SCL2 (200 MeV/u, 8.3 pμA for U+79)
(600MeV, 660 μA for p)
MEBT
RFQ
CB
Cyclotron
HRMS
ISOL
Target
μSR, Medical
Cyclotron
RF Cooler (p, 70 MeV, 1mA)
SCL1 (Post Acc.)
IF Target
IF system
IF Separator
Post Accelerator
Atomic Trap
ECR-IS
ISOL system
Gas Catcher
Post-Accelerator System
LEBT
ECR-IS ( 10keV/u, 12 pμA)
RFQ (300keV/u, 9.5 pμA)
MEBT
SCL1 (18.5 MeV/u, 9.5 pμA)
Driver Linac
CS
• Accelerates RI beams from the
ISOL system up to 18.5 MeV/u and
RI beam can be injected to SCL2 to
higher energy
• Consists of charge breeder, RFQ,
MEBT, superconducting linac etc.
• High beam quality required
• Adopts the same SCL layout
SCL2 (200 MeV/u, 8.3 pμA for U+79)
(600MeV, 660 μA for p)
MEBT
RFQ
CB
HRMS
ISOL
Target
μSR, Medical
Cyclotron
RF Cooler (p, 70 MeV, 1mA)
SCL1 (Post Acc.)
IF Target
IF system
IF Separator
Post Accelerator
Atomic Trap
ECR-IS
ISOL system
Gas Catcher
Design of IF Separator
Pre-separator: S-shape
Main separator: C-shape
Max. magnetic rigidity= 8 Tm
W. Wan, J. Kim, Cyclotron Conf. 2010
Beam Optics of Pre-Separator
Horizontal
Beam Shielding Wedge
dump
Vertical
p/p= 1.5%
Aberrations up to 7th order
Calculated with TURTLE
e= 4  mm mrad
p/p =  5 %
Schedule
• SAR (Safety Analysis Report) Review is a critical path to
accelerator system installation and commissioning.
• Rather optimistic schedule for SAR Review process is
assumed.
• Accelerator tunnel construction begins Feb/01/2016.
• Installation of accelerators will begin Jul/01/2016.
Schedule
Schedule
• Very tight installation and commissioning schedule to
meet the 2017 completion
Organization Chart
Rare Isotope Science Project
Kim, Sun Kee
Recruiting on-going
Accelerator Sys. Division
Jeon, Dong-O
SCL Team
Kim, Hyung Jin (leader)
Jung, Hoe Chun
Lee, Jung Han
Choi, Chul Jin
Joo, Jong Dae
Experimental Sys. Division
Kim, Yong Kyun
IF ∙ RF Team
Kim, Jong Won (leader)
Han, Jae Eun
Kim, Mi Jung
Kim, Do Gyun
Kim, Myeong Jin
Song, Jeong Seog
Kim, Seong Jun
Injector ∙ Beam Phy Team
Hong, In Seok (leader)
Kim, Byoung Chul
Choi, Bong Hyuk
Seo, Chang Seok
Kim, Hye Jin
Jang, Si Won
Hwang, Ji Gwang
Bang, Jung Bae
Man-power Plan
Recruiting Plan for young scientists and engineers
2012
2013
2014
2015
2016
Total
/ engineers
20
20
12
10
8
70
Budget (\100M)
10
10
6
5
4
35
Young scientists
Project-wise Man-power Plan
2011
2012
2013
2014
2015
2016
2017
Regular
1
33
50
116
130
140
150
(Termed)
(0)
(39)
(50)
(50)
(50)
(50)
(50)
Summary
• Previous conceptual design was reviewed / assessed
and design changes are made (reflected in Baseline
Design Summary).
• The RISP is phasing into technical design stage.
• Schedule and Cost are being evaluated.
• Having developed man-power plan to support the
schedule.
• We are getting ready for the construction of the SRF
Test Facility.
• International Collaboration is an important part for
the success of the project.
Thanks for Your Attention!

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