View
219
Download
0
Category
Tags:
Preview:
Citation preview
1
Hesheng ChenInstitute of High Energy Physics
Beijing 100049, China
Future Plan of IHEP Future Plan of IHEP
1. Introduction 2. BEPCII3. Medium and long term plan4. Neutrino Physics Experiment5. Beijing Spallation Neutron Source6. CXFEL
2
Institute of High Energy PhysicsInstitute of High Energy PhysicsChinese Academy of Sciences
Comprehensive and largest fundamental research center in China
For :For :– Particle physicsParticle physics– Accelerator technologies and applications Accelerator technologies and applications – Synchrotron radiation technologies and applicationsSynchrotron radiation technologies and applications1000 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 for HEP at 1973 . stitute for HEP at 1973 .
3
Major Facilities • Beijing Electron-Positron Collider (BEPC)
• Beijing Spectrometer (BES)
• Beijing Synchrotron Radiation Facility (BSRF)
• Yangbajing Cosmic Ray Observatory
• Beijing Free Electron Laser (BFEL)
• High Density Slow Positron Source
4
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/yearFinished running April 2004, and started upgrade interleaving with
SR runnning.
5
Observation of an anomalous enhancement near the threshold of mass spectrum at BES II
M=1859 MeV/c2
< 30 MeV/c2 (90% CL)
J/pp
M(pp)-2mp (GeV)
0 0.1 0.2 0.33-body phase space
acceptance
2/dof=56/56
acceptance weighted BW +3 +5
10 25
pp
BES II
Phys. Rev. Lett. 91, 022001 (2003)
X(1860)
6
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
7
X(1835) could be the same structure as X(1860) indicated by pp mass threshold
enhancement
• X(1835) mass is consistent with the mass of the S-wave resonance X(1860) indicated by the pp mass threshold enhancement.
Its width is 1.9 higher than the upper limit of the width obtained from pp mass threshold enhancement.
• On the other hand, if the FSI effect is included in the fit of the pp mass spectrum, the width of the resonance near pp mass threshold will become larger.
8
Yangbajing Cosmic Ray Observatory ( Tibet, 4300m )
IHEP-INFN RPC China-Japan Air Shower Array
9
Hard X-ray Modulate Telescope Satellitescan sky for hard X ray point sources
Charged particle shielding
Collimator
Crystals
PMTSupport structure
10
Comparison between HXMT and INTEGRAL
Angular Resolution 2’ 15’Source Location 0.2’ 2’Sensitivity (10-7 / cm2 S keV) 3 10Observation Mode survey yes no local imaging yes yes pointing yes no
the HXMT satellite is expected to be launched by 2010
HXMT INTEGRAL
11
BEPC
4w1
Diffuse ScatteringX-ray fluorescence
analysis
Topography
4B9
X-ray DiffractionSmall angle scattering
Photoemission SpectroscPopy
3B1
Lithography
3W1
Middle energy
4W1B
4W1A
4B9B
4B9A3B
1B
3B1A
3W1A
3W1B
4 wigglers and 13 beam lines. > 300 exp./year from > 100 institutions
Beijing Synchrotron Radiation Facility
140mA@2.2GeV
1W1A
XAFS1W1B
High-pressure diffraction
LIGA
VUV
Macromolecular
3B3
1w1
4w2
3B3
Soft X-ray Optics
12
Structure of third type of light–harvester protein. The structure diffraction data taken at BSRF.
13
BEPC future development
High Precision Frontier: precision measurement in charm energy region (2-4 GeV), and search for new phenomena. • Transition between continuum and resonance's, perturbative and non-perturbative QCD• Rich of resonance's, charmonium and charmed mesons. • New type of hadronic matter predicted in the region, e.g. glueball and hybrid , pentquark, exotic particles…• Advantages at Threshold : large , low multiplicity, pure initial state, S/B optimum Upgrade BEPC into two ring collider, increasing luminosity by a factor 100, rebuild detector to adapt high event rate and reduce sys. errors. Estimated cost: 77M US$.
14
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
15
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. Advanced double-ring collision technology.
• 93 bunches , total current > 0.9A in each ring. • Collision spacing : 8 ns.• In south, collision with large 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.
16
Schedule: 3 stages• Stage I:
– May –Oct. 2004: Linac upgrade – Dec. 2004 – June 2005: Synchrotron Radiation running
• Stage II: 1 June- 30 Nov. 2006: – Tuning of two ring machine – SR running – BES III detector assembling and tuning
• Stage III– 1 -15 Dec. 2006 dismount interaction region. – 16-31 Dec. 2006 BESIII detector moving into beam line– Jan. – April . 07 : Machine-Detector tuning.
• Physics run by May 2007
17
Progress of BEPCII: Linac
• The installation of Linac upgrade finished at middle of Oct. 2004.
• Tuning Linac, e- beam available for the ring injection middle of Nov.
• Synchrotron radiation running started at the end of Dec. 2004,
• Linac Tuning progress: close to design goals. – e+ beam available at the end of Linac March 19 – At the end of Linac, e+ current reached design value, and em
mitance is better than design value. – Frequency 12.5Hz →25Hz → 50Hz– Positron injection successful.
18
19
Progress of BEPCII
• Most of prototype R&D are successful. – Antechambers – Magnets – Special magnets at interaction region– Power supplies– Pre-alignment of half unit. – ……
• Mass production of storage ring and detector components go smoothly.
• Jan.- June 2005 SR ruuning finished. • 4 July Storage ring upgrade started.
20
SC cavities designed by KEK and IHEP, arrived
21
Magnet Production finished
22
Pre-alignment of half unit
Half unitHalf unit
23Simulation of installation
24
Injection kicker magnet
25
Fabrication of vacuum chamber
26
Production and test of SC quads at BNL
27
Dual-aperture magnet (Q1)
Q1a Q1b
28
Installation of two cryogenics systems finished, and reached the specification
29
Event statistics at BESIII
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
30
• Adapt to high event rate of BEPCII: 1033cm-2 s-1 and bunch spacing 8ns• Reduce sys. errors to match high statistics photon measurement, PID…• Increase acceptance
MDC: small cell & He gas xy=130 m sp/p = 0.5% @1GeV dE/dx=6%
EMCAL: CsI crystal E/E = 2.2% @1 GeV z = 0.5 cm/E
TOF: T = 100 ps Barrel 110 ps Endcap
Magnet: 1 T Super conducting
Muon ID: 9 layer RPC
Trigger: Tracks & ShowersPipelined; Latency = 2.4 ms
Data Acquisition: Event rate = 3 kHz Thruput ~ 50 MB/s
BESIII detectorBESIII detector
31
Mechanical Structure of Draft Chamber
32洁净间 穿丝机
Draft Chamber wiring machine
33
SC magnet: coil winding
Coil winding completed on June 3
35
Assembling of BESII SC Magnet
36
Return yoke pre-assembly completed May 31
37
Return Yoke at Exp. Hall
38
Progress of CsI calorimeter 6300 crystals, (5.2x 5.2 – 6.4 x 6.4) x 28cm3 PD readout, noise ~1100 ENC Energy resolution: 2.5%@1GeV Position resolution: 5mm@1GeV
crystal testing and assembling for barrel
Total in barrel
received tested Assembled
# of crystal
5280 3736 3340 2400
% 71% 63% 45%
39
no partition wall Mechanical support structure
40
Simulation of installation
41
system : RPC• 9 layer, 2000 m2
• Bakelites, no lineseed oil
• 4cm strips, 10000 channels
• Noise less than 0.04 Hz/cm2
• Production finished
• Installation of end cap finished
42
BESIII International Collaboration
• 20 Chinese Univ. and institutions
• US groups: Hawaii, Seattle …
• Japanese Groups: Univ. of Tokyo, KEK
• JINR
• Panda of GSI.
43
BESIII Expected Physics Results
Because lum. Increase by two-orders of magnitude, BES III can obtain many important results in tau-charm physics, the main focus of this workshop.
Some expected results with Monte Carlo simulation:
• Precise measure CKM parameters
• Precise R measurement
• Search for glueballs and exotic states, determine spin and
parity
• studies on pentquark
44
Progress of BEPCII
• Most of prototype R&D are successful. – Antechambers – Magnets – Special magnets at interaction region– Power supplies– Pre-alignment of half unit. – ……
• Mass production of storage ring and detector components go smoothly.
• Jan.- June 2005 SR ruuning finished. • 4 July Storage ring upgrade started.
45
Possible projects for Middle term Possible projects for Middle term • Charm physics @ BEPCII • Modulated hard X-ray telescope satellite• Neutrino experiments:
– Reactor neutrino to measure sin2213 – National underground Lab.– Very LBL oscillation experiment: J-Prac→ Beijing
• High power proton Accelerator: – Chinese Spallation Neutron Source 100KW→200 KW– Accelerator Driven Subcritical system
• Hard X-ray FEL• Convert BEPC into dedicated SR source after
BEPCII finished physics running
46
International Collaborations• CMS & Atlas @ LHC: tier 2 for each • EXFEL… • ILC:
Parameter choice, IHEP & Tsinghua U., headed by J.Gao Damping Ring study, IHEP group;Positron source study, sponsored by NSFC (G.X.Pei)RF power and modulators (Y.L.Chi)ATF2 collaboration, magnet production is in progress (J.Q.Wang);Superconducting RF cavity study (IHEP and Peking U., S.C.Zhao & D.Zhao);
47
Superconducting laboratory in IHEP
48
Multi-cell SRF cavity study ( 2003 - )
49
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
50
Experiment to measure sin2213 using Daya Bay reactor neutrino
• Daya Bay NPS is the best site in the world: – 60 km from Hong Kong, – 12GW now, 18 GW @ 2008– good mountain near NPP for near and far detectors.
• Near (500m) and Far detector (1.8km), modular, expect accuracy of 1% in sin2213 • NPS is happy to cooperate • Site study and tunnel design are underway • Chinese funding agencies agreed to support • US physicists from LBL… joined collaboration, and DOE expressed interest to support
51
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
Dayabay Nuclear Power StationDayabay Nuclear Power Station
52
53
Schematics of a multi-module detector
54
(4) (4) Beijing Spallation Neutron SBeijing Spallation Neutron Sourceource
55
Main Parameters of the BSNS
Approved by Chinese Government in principle July 2005
57
H- ion source (20mA):
RFQ (3.5 MeV)
ML loaded RF cavity
Rapid cycling magnet
White circuit power supply
Ceramic vacuum chamber
BSNS R &D Activities
58
The Beijing XFEL Test Facility
Seeding L. s=270nm , P=200MW, s=100fs
e beam E=1.1GeV , Ip=600Amp , n=2.5mmmrad , E/E=0.01%
Parameters 1st stage 2nd stage
Undulator u (cm ) 6.0 4.0 4.0 2.8
g (cm) 0.94 0.92 0.92 0.92
Dispersion d/d 2.3 4.0
FEL
(nm) 270 45 45 9
Lg (m) 0.84 0.91 0.91 1.43
Lu (m) 1 5.7 1 8.7
P (MW) 200 in 1140out 300 in 711out
59
The CXFEL plan
Undulators and user stations of stations
LCLS TESLA PAL XFEL SCSS CXFEL
Radiation wavelength [Å] 1.5 1.0 3.0 36 1.5
FEL parameter, [x10-4] 5.0 3.4 4.3 8.7 4(3.5)
Peak coherent power [GW] 9 24 2.3 1.8 4.4(2.8)
Peak brightness [x1033]* 1.2 5.4 0.14 0.01 0.3
Average brightness[x1022 ] 3.3 4320 0.22 0.01
Electron beam energy [GeV] 14.35 20 3.0 1.0 7.7(6)
Peak current [kA] 3.4 5.0 4.0 2.0 4
Normalized emittance [m-rad] 1.2 1.4 1.5 2.0 1.5
RMS energy spread [%] 0.008 0.0125 0.02 0.02 0.02
FWHM bunch length [fs] 230 200 230 470 230
Repetition rate [Hz] 120 10 60 50 25
Bunches per pulse 1 4,000 1 1 1
Undulator period/full gap [mm] 30/5 38/10 12.5/3.0 15/3.5 25/8(18/4)
Undulator peak field [T] 1.32 1.06 0.97 0.94 0.8(0.95)
Undulator parameter, K 3.71 3.8 1.14 1.3 1.9(1.6)
Undulator beta [m] 18 35 15 10 25(25)
Saturation length/total length [m] 86/113 145/175 50/58.5 20/22.5 120(104)
Segment length [m]* No. of segment 3.42x33 5x35 4.5x13 4.5x5
Cost/construction schedule ~225M$/3 684 M€/6 42M$/3 30M$/4 ~1.5BRMB/5
60
Thanks !
Recommended