View
217
Download
0
Tags:
Embed Size (px)
Citation preview
1
Hesheng ChenInstitute of High Energy Physics
Beijing 100049, China
Prospect of Particle PhysicsProspect of Particle Physics
in China in China
2
Particle Physics in China• Chinese Nuclear physics and Particle physics have long tr
adition.• Institute of Modern Physics established 1950. • JINR: discovery of anti-• Independent Institute for High Energy Physics: establishe
d at Feb. 1973 • Beijing Electron Positron Collider: milestone of Chinese h
igh energy physics• Synchrotron radiation Light sources: BSRF, SSRF
3
Institute of High Energy Institute of High Energy PhysicsPhysics
Comprehensive and largest fundamental research center in China
Major research fields :Major research fields :– Particle physics: Charm physics @ BEPC, LHC exp., Particle physics: Charm physics @ BEPC, LHC exp.,
cosmic ray, particle astrophysics, cosmic ray, particle astrophysics, physics …physics …– Accelerator technology and applications Accelerator technology and applications – Synchrotron radiation technologies and applicationsSynchrotron radiation technologies and applications1030 employees, ~ 650 physicists and engineers, 400 PhD Students and postdoctors
Established at 1950, and became an independent inEstablished at 1950, and became an independent institute at 1973 . stitute at 1973 .
4
Particle Physics Experiments in China
• BEPC & BEPCII: BESII/BESIII• Non-accelerator experiments
– Yangbajing cosmic-ray observatory– L3cosmic (finished)– Hard X-ray modulated telescope – Daya Bay reactor neutrino experiment
• International collaboration:– Mark-J (finished)– LEP: L3, ALEPH (finished)– LHC : ATLAS, CMS, LHCb, Alice– AMS,… – KEKB: BELLE; Kamland, SuperK.– RHIC: Star, Phenix– ILC R&D
5
Bird’s Eye View of Bird’s Eye View of BEPCBEPC
6
BEPC constructed in 1984 –1988 with beam energy: 1 – 2.8 GeV– Physics Run : Luminosity 1031cm-2s-1 @ 1.89GeV, 5 month/year– Synchrotron Radiation Run : 140mA @ 2.2 GeV, 3 month/year
Physics Running finished March 2004 Synchrotron Radiation Running finished June 2005
7
Korea (4)Korea Univ.
Seoul National Univ. Chonbuk National Univ.Gyeongsang Nat. Univ.
Japan (5)Nikow Univ.
Tokyo Institute of TechnologyMiyazaki Univ.
KEKUniv. of Tokyo
USA (4)Univ. of Hawaii
Univ. of Texas at DallasColorado State Univ.
SLAC
UK (1)Queen Mary Univ.
China (18)IHEP
Univ. of Sci. and Tech. of ChinaShandong Univ., Zhejiang Univ.
Huazhong Normal Univ. Shanghai Jiaotong Univ.
Peking Univ., CCAST Wuhan Univ., Nankai Univ.
Henan Normal Univ.Hunan Univ., Liaoning Univ.
Tsinghua Univ., Sichuan Univ. Guangxi Univ., Guangxi Normal Univ.
Jiangsu Normal Univ.
8
0
10
20
30
40
50
60
CBAL MK II MK III DM2 BES I BES II
J/
World J/ Samples (×106)
BESII 58M J/
J/ decays: ideal to search for new types of hadrons
• Gluon rich
• Very high production
cross section
• Higher BR to hadrons than that of ’ (“12% rule”).
• Larger phase space to 1-3 GeV hadrons than that of Y
• Clean background environment compared with hadron collision experiments, e.g., “JP, I” filter
J/
J/
J/
9
Main Physics Results from BESBES
Precision measurement of mass: world average value changed by 3, accuracy improved by factor of 10, and approved lepton universality.
R Measurement at 2-5GeV: R/R 15-20% →6.6%– Higgs mass prediction from SM– g-2 experiment – (Mz
2) -1 : 128.890±0.090 → 128.936 ± 0.046• Systematic study of (2S) and J/ decays. Resonance X(1835) in with mass and width
are consistent with that of the S-wave resonance X(1860) indicated by the pp mass threshold enhancement.
'/J
10
Impact of BES’s New R Values on the SM Impact of BES’s New R Values on the SM FitFit for for α (Mα (Mzz
22) and Higgs mass) and Higgs mass
090.0890.128)( 12 ZM
046.0936.128)( 12 ZM
1995 1995 beforebefore BES R dataBES R data
2001 2001 withwith BES R dataBES R data
g – 2 experiment
11
Statistical Significance 7.7
BESII Preliminary
J
BES: X(1835) in
X(1835)7.7
BESII Preliminary
2
2
MeV/c 7.73.207.67
MeV/c 7.21.67.1833
54264
M
Nobs
410)4.04.02.2()()( XBXJB59.1
8.0 10)4.00.7()()(:.. ppXBXJBfc
'/J
12
• The mass and width of X(1835) are consistent with that of the S-wave resonance X(1860) indicated by the pp mass threshold enhancement
• X(1835) could be the same structure as ppbar mass threshold enhancement
• Currently all explanations have some difficulties
• Its spin-parity should be 0-+ BESIII may measure it with a factor of 100 more statistics
X(1835), the same as X(1860)?
13
Observation of non-DDbar decays of (3770)
• (3770) is believed to be a mixture of 1D and 2S states of cc-bar systemIt is thought to decay almost entirely to pure DD-bar
• From a measurement of DD-bar cross section and R value, BESII found for the first time a significant fraction of non-DD-bar Br.
• BESII also found for the first an exclusive channel of non-DDbar decays, which was confirmed later by CLEO-c:
PLB 605 (2005) 63
Hep-ex/0605105
14
LHC ExperimentsLHC Experiments
1. CMS – 1/3 of CSC at muon end caps (IHEP) – HV boards for RPC (IHEP) – RPC of barrel muon (Beijing Univ.) – Physics and MC
2. Atlas – Drift Monitor chambers (IHEP)– Physics and MC
3. LCG: Tier 24. LHCb: Tsinghua Univ. 5. Alice: CIAE,
15
Non-Accelerator physics experiment
1. Cosmic ray experiment– Yangbajing cosmic ray observatory
• China-Japan Air Shower Array • China-Italy Argo RPC carpet project
– L3 Cosmic ray measurement2. Particle Astrophysics experiments:
– Alpha Magnetic Spectrometer (AMS) – Hard X ray modulated Telescope satellite – ray burst detector– X-ray detector of Chinese Moon project.
16
Yangbajing Cosmic Ray Observatory ( Tibet a.s.l. 4300m )
IHEP-INFN Argo RPC China-Japan Air Shower Array
17
New anisotropy component and corotation of GCR (Science 314(2006) 439-443)
New anisotropy componentAmp=0.16% w/o corotation;Observation: 0.03%±0.03%.
Celestial Intensity map (E~3TeV) Intensity @ E~300TeV
18
AMS01 permanent magnet and structure were built at Beijing, and became the first big magnet in space as payload of Discovery June 1998.
• Search for antimatter and dark matter • precision measurement of isotopes
Alpha Magnetic Spectrometer
19
AMS02 ECAL: IHEP, PISA and LAPP
Space qualification at Beijing
ECAL assembling at IHEP
20
2. BEPCII: High Lumi. Double–ring Collider
Build new ring inside existing ring . Two half new rings and two half old rings cross at two IR’s, forming a double ring collider.
BEPCII
21
BEPC II Double ring Design• In the existing BEPC tunnel, add another ring, cross over at south a
nd north points, two equal rings for electrons and positrons. double-ring collision technology.
• 93 bunches , total current > 0.9A in each ring. • Collision spacing : 8 ns.• In south, collision with large horizontal cross-angle ( ±11 mr ) .• Calculated luminosity : 1033 cm-2 s-1 @ 3.78GeV of C.M. energy.• Linac upgrade: e+ 50mA/min. , Full energy injection up to 1.89GeV • In north cross point, connecting SR beam between two outer rings, in south cross point, use dipole magnet to bend the beam back to out
er ring.• SR run : 250mA @ 2.5 GeV.• Major detector upgrade : BES III.
22
1029
1030
1031
1032
1033
1034
1035
1036
1037
1 10 100 1000
GLC
ADONE
VEPP2000
KEK B and PEP II
KEK BPEP II
CESR
DAFNE
DAFNE2
BEPCIII
CESRc
Ecm
(GeV)
L (cm-2 sec-1)
VEPP2M
LEP
TRISTANPETRA
VEPP4MDORIS
SPEARBEPC
COLLIDERS
FACTORIES
SUPER FACTORIES
ee++-e-e-- Colliders: Past, Present and Future Colliders: Past, Present and Future
C. Biscari, Workshop on e+e- in 1-2 GeV Range, September 10-13, 2003, Italy
L (cm-2 s-1)
E (GeV)
23
Physics at BEPCII/BESIII• Precision measurement of CKM matrix elements
• Precision test of Standard Model
• QCD and hadron production
• Light hadron spectroscopy
• Charmonium physics
• Search for new physics/new particles
Physics
Channel
Energy
(GeV)
Luminosity
(1033 cm–2s –1)
Events/year
J/ 3.097 0.6 1.0×1010
3.67 1.0 1.2×107
’ 3.686 1.0 3.0 ×109
D* 3.77 1.0 2.5×107
Ds 4.03 0.6 1.0×106
Ds 4.14 0.6 2.0×106
24
Light hadron spectroscopy• Baryon spectroscopy• Charmonium spectroscopy• Glueball searches• Search for non-qqbar states
1010 J/ events together with LQCD are probably enough to pin down most of questions of light hadron spectroscopy
Spectrum of glueballs from LQCD
25
Precision measurement of CKM---- Branching rations of charm mesons
• Vcd /Vcs: Leptonic and semi-leptonic decays
• Vcb: Hadronic decays
• Vtd /Vts: fD and fDs from Leptonic decays
• Vub: Form factors of semi-leptonic decays
• Unitarity Test of CKM matrixCurrent BESIII
Vub 25% 5%
Vcd 7% 1%
Vcs 16% 1%
Vcb 5% 3%
Vtd 36% 5%
Vts 39% 5%
26
Precision test of SM and Search for new Physics• DDbar mixing
DDbar mixing in SM ~ 10 –3 - 10 –10
DDbar mixing sensitive to “new physics”
Our sensitivity : ~ 10-4
• Lepton universality
• CP violation
• Rare decays
FCNC, Lepton no. violation
27
Stage #1: Linac upgrade reached designed goal
RF Gallery
Linac Tunnel
Progress of BEPCII
28
Design Measured BEPC
Energy (e+ / e-) ( GeV ) 1.89 1.89 1.30-1.55
Current ( e+ ) ( mA ) 37 61 ~ 5
Current ( e- ) ( mA ) 500 > 500 ~300
Emittance ( e+ ) ( 1 σ, mm-mrad )0.40
(37 mA)
0.39~0.41
(40~46 mA)----
Emittance (e-) ( 1 σ, mm-mrad )0.10
(500 mA)
0.09~0.11
(600 mA)----
Pulse Repe. Rate ( Hz ) 50 50 12.5
Energy Spread ( e- ) ( % ) **± 0.50
(500 mA)
± 0.44
(600 mA)± 0.80
Energy Spread ( e+ ) ( % ) **± 0.50
(37 mA)
± 0.50
(≥37 mA)± 0.80
Assessment result: Linac Beam Performance measured by the Test Group, in June-July 2006
29
Stage #2: Storage Ring upgradereached Goal
1. Jan.- June 2005 SR running √
2. Production of Double ring components Finished√
3. Remove old ring√, install Double ring√
4. BESIII construction √
30
Storage Ring installation finished
31
1st Interaction region1st Interaction region 2rd Interaction 2rd Interaction regionregion
32
First beam stored in storage ring First beam stored in storage ring 18 18 Nov.2006Nov.2006 Synchrotron radiation run Synchrotron radiation run
provided provided Dec. 2006Dec. 2006
33
Tuning of Storage Ring: good progress
• Positron Injection rate reached ~ 50 mA/min. • Electron Ring stored beam Feb. 6 2007• Positron Ring stored beam March 9 2007• First collision: 25 March 2007. • Now 50 by 50 bunches collision works. • Electron beam current reaches 150 mA, positron bea
m current reaches 200mA• The measurement of the storage ring parameters are
in agreement with prediction. The luminosity is quite good.
• Difficulties in SC magnets and cryogenic system solved.
34
BESIII Detector — Adapt to high event rate : 1033cm-2 s-1 and bunch spacing 8ns
— Reduce sys. errors for high statistics: photon measurement, PID…
— Increase acceptance , and give space for SC quads
Be beam pipe
SC magnet, 1TMagnet yoke
MDC, 120 m
CsI(Tl) calorimeter, 2.5 %@1 GeV
TOF, 90ps
RPC
35
Main Drift Chamber• Small cell • 7000 Signal wires: 25m gold-plated tungsten • 22000 Field wires: 110 m gold-plated Aluminum • Gas: He + C3H8 (60/40)• Momentum resolution@1GeV: • dE/dX resolution: ~ 6%.
%37.0%32.0 t
P
Pt
36
MDC construction finished• Wiring completed with good quality• Inner chamber and outer chamber assembled• Gas leakage test finished• Cosmic-ray test started
37Cosmic ray test
38
CsI(Tl) crystal calorimeter• Design goals:
– Energy: 2.5% @ 1GeV
– Spatial: 0.6cm @ 1GeV
• Crystals:– Barrel: 5280 w: 21564 kg– Endcaps: 960 w: 4051 kg– Total: 6240 w: 25.6 T
2 Photodiode+2 Preamp+ (1 Amplifier)Photodiode(PD): Hamamatsu S2744-08 (1cm x 2cm)Preamplifier noise: <1100 e (~220kev)Shaping time of amplifier: 1μs
39
Support Structure of EMC Barrel
40
41
90% installation done90% installation done
42
system : RPC• 9 layer, 2000 m2
• Special bakelite plate w/o lineseed oil • 4cm strips, 10000 channels• Noise less than 0.1 Hz/cm2
• Good candidate for ILC HCAL and muon chamber
43
BESIII Magnet ProgressThermal
insulation assembl
y
transportation
wiring
installation
44
Field reached 1 teslaField reached 1 tesla
45
Schedule• May – Oct. 04. : √
– Linac upgrade – BESII detector removing
• Nov. 04 – June 05: Tuning and SR running √• July 05 – Oct. 06: Long shutdown
– Remove existing ring √– Upgrade infrastructure √– Install two rings:√
• Nov. 06 – Feb. 08: – Tuning of storage ring– SR running– field mapping of SC magnets– Assembling of BESIII
• Mar. 08: BESIII detector moved into beam line• May. 08 : Starting machine-detector tuning. • Physics run by Summer 2008
46
Particle Physics in 21Particle Physics in 21stst Century Century • Particle Physics & particle astrophysics: great challenges
– Symmetry breaking mechanism: Higgs? SUSY? – Neutrino physics– CP violation: – Dark matter? – Dark energy?
Great opportunities in 21st century !• Major frontiers: most are big facilities
– Accelerator Experiments: • High energy frontier: LHC, ILC… • High precision frontier
– Non-Accelerator experiments– Particle astrophysics– Neutrino experiments
• Difficulties in big sciences: more international cooperation and more invest are the key issues
47
Chinese Particle Physics in 21Chinese Particle Physics in 21stst Century Century
• Chinese economy grows quickly and steadily • Chinese government increases the supports to sciences
and technology significantly and constantly . • With construction of BEPCII/BESIII, Shanghai light
source and CSNS, the new generation of Chinese accelerator and detector teams are shaping: young and growing fast. They could catch the future opportunity in particle physics
• Strong demands on – the large scientific facilities based on accelerators. – the application of accelerator and detector technology
48
Chinese Particle PhysicsChinese Particle Physics Medium and Long Term Plan Medium and Long Term Plan
• Charm physics @ BEPCII • Intl. collaborations: LHC exp., ILC,… • Modulated hard X-ray telescope satellite• Yangbajing Cosmic ray Observatory• Neutrino experiments:
– Daya Bay Reactor neutrino to measure sin2213 – National underground Lab. (under discussion)– Very LBL oscillation: J-Prac→ Beijing (under di
scussion)
49
Chinese Particle PhysicsChinese Particle Physics Medium and Long Term Plan Medium and Long Term Plan (cont.)(cont.)
• High power proton Accelerator: – Chinese Spallation Neutron Source– Accelerator Driven Subcritical system
• Test facility of Hard X-ray FEL• Convert BEPC into dedicated SR source after BE
PCII finished physics runningIHEP extents research fields, to protein structure, n
ano-science, material science… → Multiple discipline research center
Hard X-ray Modulation Telescope (HXMT)
Service Cabin
Payload Cabin
51
Payloads onboard HXMT
HE: NaI/CsI 20-250 keV 5000 cm2
Size : 1900×1600×1000 mm
ME: Si-PIN,5-30keV952 cm2
LE:SCD,1-15 keV 384 cm2LE:SCD,1-15 keV 384 cm2
52
• Main Detector NaI(Tl)/CsI(Na) Phoswich– Total Detect Area ~5000 cm2
– Energy Range 20 ~ 250 keV– Energy Resolution ~19% (@60keV)– Continuum Sensitivity ~3.0×10-7 ph cm-2 s-1 keV-1 ,or 0.5 mCrab (3σ@100k
eV,105s)– Field of View 5.7°x 5.7° ( FWHM )– Source Location ≤1 arcmin(20)– Angular Resolution ≤5 arcmin(20)
• Secondary Instruments ME (5-30 keV, Si-PIN, 952 cm2), LE (1-15 keV, SCD, 384 cm2)• Mass ~2700 kg (payload ~1100 kg)• Dimension 2.0×2.0×2.8 m3 (L×W×H)• Nominal Mission lifetime 3-4 years (6 years desired)• Orbit Altitude 550km , Inclination 43° • Attitude Three-axis stabilized
Control precision : ±0.10° Stability: 0.005 °/s Measurement accuracy: <0.01°
Characteristics of the HXMT Mission
53
Sensitivity
54
Angular Resolution 12’ < 5’ 14’
Source Location (20σ) 1’ < 1’ 1’
Pointed Sensitivity (mCrab@100 keV) 3.8 0.5 9
Half Year Survey Sensitivity (mCrab) 2 0.5 1
Observation Capability
All sky survey ok good yes
Selected sky deep survey good good bad
Narrow field pointing observation bad good no
Integral/IBIS HXMT/HE wift/BAT
Comparison of HXMT and other two telescopes in the same energy band.
55
Hard X-ray sky survey with highest sensitivity• High precision hard X-ray full sky map: • Discover highly obscured supermassive BHs: • Discover new types of high energy objects:
High precision pointed observations of HE objects• Space-time in strong gravitational field: dynami
cs and radiation near stellar mass and supermassive BHs
• Equation of state in strong magnetic field: neutron star and its surface properties
• High energy particle acceleration: AGN, SNR, shock and relativistic jets
• Large scale structure: through hard X-ray detection of galaxy clusters
Main advantages and key science of HXMT
56
Parameterization of neutrino mixing
6 fundamental parameters in neutrino physics : Known : | m2
32|,sin2232 , m221,sin2221
Unknown: sin22 , , sign of m232
Exp. : reactor VLBL oscillation
Daya Bay Reactor J-Parc → Beijing
Neutrino mixing parameters
U 1 0 0
0 cos23 sin23
0 sin23 cos23
cos13 0 e i sin13
0 1 0
e i sin13 0 cos13
cos12 sin12 0
sin12 cos12 0
0 0 1
e
Ue1 Ue2 Ue3U1 U2 U3
U1 U2 U 3
1
2
3
57
3535大亚湾与岭澳核电站大亚湾与岭澳核电站
大亚湾核电站大亚湾核电站 岭澳核电站岭澳核电站
Daya bay reactor neutrino experiment with sensitivity of 0.01 to sin22
Daya bay reactor neutrino experiment with sensitivity of 0.01 to sin22
Daya Bay NPPDaya Bay NPP LingAo NPPLingAo NPP
58
59
Detector: Multiple modules
• Multiple modules for cross check, reduce uncorrelated errors
• Small modules for easy construction, moving, handing, …
• Small modules for less sensitive to scintillator aging
• Scalable
Two modules at near sitesFour modules at far site:Side-by-side cross checks
60
Central Detector modules
• Three zones modular structure: I. target: Gd-loaded scintillator
-ray catcher: normal scintillator
III. Buffer shielding: oil
• Reflection at two ends
• 20t target mass, ~200 8”PMT/module
E = 5%@8MeV, s ~ 14 cm
I
IIIII
Isotopes Purity(ppb)
20cm(Hz)
25cm (Hz)
30cm(Hz)
40cm(Hz)
238U(>1MeV) 50 2.7 2.0 1.4 0.8
232Th(>1MeV) 50 1.2 0.9 0.7 0.4
40K(>1MeV) 10 1.8 1.3 0.9 0.5
Total 5.7 4.2 3.0 1.7
Catcher thickness
Oil buffer thickness
61
Systematic error comparisonChooz Palo Verde KamLAND Daya Bay
Reactor power 0.7 0.7 2.05 <0.2%
Reactor fuel/spectra 2.0 2.0 2.7
cross section 0.3 0.2 0.2 0
No. of protons H/C ratio 0.8 0.8 1.7 0.2
Mass - - 2.1 0.2
Efficiency e+ Energy cuts 0.8 2.1 0.26 0.05
n energy cut 0.4 0.2
Position cuts 0.32 3.5 0
Time cuts 0.4 0. 0.2
P/Gd ratio 1.0 - 0.1
n multiplicity 0.5 - <0.1
background correlated 0.3 3.3 1.8 <0.5
uncorrelated 0.3 1.8 0.1 <0.1
Trigger 0 2.9 0 <0.1
livetime 0 0.2 0.2 <0.1
62
North America (9)LBNL, BNL, Caltech, UCLA
Univ. of Houston,Univ. of Iowa
Univ. of Wisconsin, IIT,
Univ. of Illinois-Urbana-champagne
China (12)IHEP, CIAE,Tsinghua Univ.
Zhongshan Univ.,Nankai Univ.Beijing Normal Univ.,
Shenzhen Univ., Hong Kong Univ.Chinese Hong Kong Univ.
Taiwan Univ., Chiao Tung Univ.,National United univ.
Europe (3)JINR, Dubna, Russia
Kurchatov Institute, Russia
Charles university, Czech
Daya Bay collaboration
63
Status of the project• Total Cost estimated 32 M$ in Chinese accounting. • MoST and CAS officially approved the project. • Chinese Atomic Energy Agency, Daya Bay nuclear power Co. and l
ocal government support the project strongly.• Most Funds from China were approved.• Site survey including bore holes completed. Design of tunnel is und
er way. • Construction of tunnel should be started in 3 month.• R&D started in collaborating institutions, the prototype is operation
al• DoE agreed to provide funds to construct 50% of the detector Propo
sals to governments under preparation • It is great challenge to reach the sensitivity of 0.01. Italian physicists
has long tradition on n physics. Italian physicist groups are most welcomed
64
Schedule of the project• Schedule
– 2004-2006 R&D, engineering design,
secure funding– 2007-2008 construction– 2009 installation– 2010 running
65
VLBL Experiment of J-Parc to Beijing • V LBL exp. with 2000 - 4000 km is very interesting for many i
mportant physics, if sin22is not too small:– Sign of the difference of mass square– CP phase of – τappearance
• V LBL experiment from JHF to Beijing– Good tunnel: 20 km north of Beijing, near highway to Great
Wall. 560 m long, 34 meter wide, 13 meter height , 150 m rock on top
– Good infrastructure available– 2200 km to JHF with 9.5o dip angle
• Second beam line required. J-Parc phase 2? Factory ? • Two reports issued and several papers published.
66
780 Km: CERN → Gran Sasso Opera 730 Km: FNAL → Soudan Minos2100 Km: J-Parc → Beijing
67
Tunnel Gate
(Aviation Museum)
20Km north of Beijing, near highway to Great Wall
68
Tunnel Inside
69
sin2(213) ~ 0.07
70
sin2(213) ~ 0.007
CSNS layout
Linac: H- beam, 81 MeV (DTL) to 230 MeV (SCL)Rapid-cycling synchrotron: 1.6 GeV at 25 Hz
Chinese Spallation Neutron Source
CSNS primary parameters
Phase I Phase II Phase II’
Beam power on target [kW] 120 240 500
Proton energy on target [GeV] 1.6 1.6 1.6
Average beam current [A] 76 151 315
Pulse repetition rate [Hz] 25 25 25
Protons per pulse [1013] 1.9 3.8 7.8
Linac energy [MeV] 81 134 230
Linac type DTL DTL DTL+SCL
Target number 1 1 1 or 2
Target material Tungsten
Moderators H2O (300K), CH4(100K), H2(20K)
Number of spectrometers 7 18 >18
CSNS ParametersCSNS Parameters
Status of CSNS
IHEP is in charge of the projectSite: Dongguan, Guangdong province. IHEP opens a branch. Budget: 1.46B RMB + the fund & the land from the local governments5.5 year: first beam Major project for machine team and detector team after BEPCII/BESIIIThe great challenges
74
Thank you!