HIRFL-CSR1 Institute of Modern Physics, CAS, Lanzhou2 Department of Physics, Tsinghua Univ., BeijingHushan Xu 2Zhigang Xiao 11 HIRFL-CSR 2 HIRFL-CSR3 HPLUS 4 To Do List

1 Status of the HIRFL-CSR complex

Commissioning of HIRFL-CSR

2 Hadron Physics program planned at HIRFL-CSRHadron spectroscopy / Symmetry / Spin/isospin physics

Channels ThresholdGeVPhysical interestpp elasticppppppK+K2.59NpppK+ (n+)1.79(1.58)

ppda0(980) (f0(980))2.48Mesons a0/f0 & internal quark-gluon structurepppp ()pppp1.26(2.4)1.89Isospin symmetry violationppN*, ++(K)~1.38Baryon resonance pN*0.795Baryon excited states with Big N couplingpA(, )pA K+KSub-threholdLight Meson in Medium

2 Concept design of HPLUS(Hadron Physics LanzhoU Spectrometer)Luminosity estimation: 1031/s/cm-1;Event Rate estimation: 105/s {50mb} / 10/s {1b}Total Space length: ~3.5mLife time of beam estimation: 10~1000s Some basics related to the designSome Fast Simulations Results Charged particles distribution: >85% in 90, For and N* channels, >90% charged products dominated within 30; TPC only insufficient for PID and p measurement, >5 single forward tracking detectors required; For /K identification at 1000 blocks of CsI crystals needed, totally 2m3;

Concept design of HPLUS

3 Status of HPLUS3.1 MC Simulation3.2 Detector components R&D

G4 based simulation frameworkMC Simulation started

Event Generator = Pluto++ + Single Channel simu.

pppN*(K+)pppp*(K+K-)Feasibility Study of ppppppK+K in FTD

FTD Construction in Geant4

Track Finding and momentum reconstruction

Invariant mass spectrum of K+ K-

FTD: MWDC Prototype Able to assemble large area MWDCVarious MWDC Prototypes have been made and the performance have been tested.

MWDC tested by cosmic

MWDC tested by cosmicPosition Resolution =210m

TPC Prototype R&D in Tsinghua Univ.

TPC Test results (provided by Yulan Li from THU)Spatial Resolution and Working GasResolution achieved: 100 m @ 1T & 10 cm drift distanceTransverse resolution with P10 gas at B = 1.0 TTransverse resolution with Ar:CF4:i-C4H10=94:3:3 gas at 1 TTransverse resolution with Ar:CF4:i-C4H10=94:3:3 gasWidth of pad response with Ar:CF4:i-C4H10=94:3:3 gas

EMC Calorimeter R&DCsI crystal grown in IMP. Performance ensured.

CsI single unit tested with heavy ion beam101010 sample coupled to APD202020 sample coupled to PD101010 sample coupled to PDTested at IMP

samplePeak channelsIMP11836.61835.01836.0IMP21788.21791.71788.0IMP31729.21728.31729.0S.C.H1463.71463.51464.0

Peak channelIncrementBefore irradiation1730.0After 100 rad1696.9-1.9%After 1000 rad1611.6-6.8%

R&D of the targetPellet LDPT Pellet (in collaboration with Upp. & COSY )LDPT(in collaboration with Duke)

To do List 1 Simulation 2 Concept Design Report Version03 Detector R&D( )

Full Simulation1 Platform (Root and G4-Based) THU &IMP2 TPC ()3 TOF ()4 EMC ()5 FTD ( ) THU6 I/O and integration

CD0 Writing1 Physics Interest 1). 2). 3). ()2 Tsinghua3 Tsinghua4 5 Collaboration List and Responsibility