Hadron Programs at HIRFL-CSR

Hadron Programs at HIRFL-CSR Hushan Xu 2 Zhigang Xiao 1 1 Institute of Modern Physics, CAS, Lanzhou 2 Department of Physics, Tsinghua Univ., Beijing 1 Status of the HIRFL-CSR complex (by Hushan Xu) 2 Hadron Physics program planned at CSR 3 Status of HPLUS 4 Summary

North SFC: up to 10 AMeV SSC: up to 100 AMeV SSC Building 2# SFC CSRe Building 6# CSRm CSRm: 1.1 AGeV(12C6+), 2.8 GeV(p) CSRe: 0.76 AGeV (12C6+) HPLUS 1 Status of the HIRFL-CSR complex

Ions: 12C6+， 36Ar18+，129Xe27+ (Not yet proton ) Energy: 1GeV/u for C & Ar in CSRm Intensity in CSRm: 10mA (7109) for C-600MeV/u in CSRm 1.2mA (4108) for Ar-368MeV/u in CSRm 0.5mA (1108) for Xe-235MeV/u in CSRm Slow-extraction: 1.2s for Ar-368MeV/u 3.0s for 12C4+-300 MeV/u Commissioning of HIRFL-CSR

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

2 Concept design of HPLUS(Hadron Physics LanzhoU Spectrometer) Some basics related to the design • Luminosity estimation: 1031/s/cm-1; • Event Rate estimation: 105/s {50mb} / 10/s {1b} • Total Space length: ~3.5m • Life time of beam estimation: 10~1000s Some 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 <1.5 GeV, Flight path length up to 2.5m+; • >1000 blocks of CsI crystals needed, totally 2m3;

Concept design of HPLUS

3 Status of HPLUS 3.1 MC Simulation 3.2 Detector components R&D Simulation and Detector R&D is distributed in various institutions in China.

MC Simulation started HPLUS  IO External TPC FTD MC Truth Kernel Phys. list Field Det. Constr. Det. On/off Det. Response Track gene/store HIT & Digi. Hit gen/store Data Store IO definition Det. Constr. IO implem. Det. Response Gmake env. HIT & DIGI Gmake imple. Data Store XML writer Det. Install. Def GDML writer TPC Det. Response FTD Det. Response  HIT & Digi Data Store Event Generator Pluto++/Chan. G4 Interface G4 based simulation framework

pp elastic ds/d in c.m. pppp pdpp(n)‏ P in Lab  in Lab Event Generator = Pluto++ + Single Channel simu.

Feasibility Study of ppppppK+K in FTD pppN*(K+) pppp*(K+K-)

FTD Construction in Geant4

Track Finding and momentum reconstruction Ene. Depos. Hit Elect. Drfit Digi. Tracking+Rescon.

Invariant mass spectrum of K+ K-。

Wiring machine MWDC prototype FTD: MWDC Prototype • Able to assemble large area MWDC • Various MWDC Prototypes have been made and the performance have been tested.

drift spec. Hit multiplicity Layer multiplicity Total Hit Multi. MWDC tested by cosmic

Gain VS. HV (85%Ar+15%CO2) Eff. VS. HV Tracking residual  VS. Residual MWDC tested by cosmic Position Resolution =210m

TPC Prototype （R&D in Tsinghua Univ. ）

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

EMC Calorimeter R&D CsI crystal grown in IMP. Performance ensured.

CsI single unit tested with heavy ion beam S.C.H 1×1 inch IMP3  2×2 inch IMP1 1×1 inch IMP2 1×1 inch 101010 sample coupled to APD 101010 sample coupled to PD 202020 sample coupled to PD Tested at IMP

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

Summary HIRFL-CSR provides an opportunity to open hadron physics program in <3AGeV region. HPLUS is on the R&D stage. The geometry design and sub-detector configuration are preliminarily advised according to the simulation results. R&D of various sub-detectors are ongoing. We call for collaborations from outside.

Hadron Programs at HIRFL-CSR