HIRFL-CSR的强子物理讨论

1 Institute of Modern Physics, CAS, Lanzhou2 Department of Physics, Tsinghua Univ., Beijing

Hushan Xu 2

Zhigang Xiao 1

1 HIRFL-CSR 状态 2 HIRFL-CSR计划的强子物理3 HPLUS的现状 4 To Do List

Building 2#

Building

6#

CSRm

CSRe

SFC

SSCSFC: up to 10 AMeV

SSC: up to 100 AMeV

CSRm: 1.1 AGeV(12C6+), 2.8 GeV(p)

CSRe: 0.76 AGeV (12C6+)

North

HPLUS

1 Status of the HIRFL-CSR complex

Commissioning of HIRFL-CSR

Ions: 12C6 + ， 36Ar18+ ， 129Xe27+ (Not yet proton )Energy: 1GeV/u for C & Ar in CSRm Intensity in CSRm:

10mA (7109) for C-600MeV/u in CSRm1.2mA (4108) for Ar-368MeV/u in CSRm0.5mA (1108) for Xe-235MeV/u in CSRm

Slow-extraction: 1.2s for Ar-368MeV/u3.0s for 12C4+-300 MeV/u

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

Channels Threshold（ GeV） Physical interest

pp elastic 测试探测器

ppppppK+K 2.59 与 N耦合相关的重子激发态

pppK+ (n+) 1.79(1.58)多夸克态和奇异夸克成分

ppda0(980) (f0(980)) 2.48Mesons a0/f0 & internal quark-gluon

structurepppp ()pppp

1.26(2.4)1.89

Isospin symmetry violation

ppN*, ++(K…) ~1.38 Baryon resonance

pN* 0.795Baryon excited states with Big N coupling

pA(, )pA K+K Sub-threhold Light 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: ~3.5m Life time of beam estimation: 10~1000s

Some basics related to the design

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

G4 based simulation framework HPLUS

TPC

Det. Response

Det. Constr.

Data Store

HIT & Digi.

IO definitionIO implem.

IO

Det. Response

Det. Constr.

Data Store

HIT & DIGI

FTD

Track gene/store

Hit gen/store

MC Truth

Gmake env.

Gmake imple.External

Det. Response

Det. Response

Data Store

HIT & Digi

XML writer

Det. Install. DefGDML writer

TPC

FTD

Det. On/off

Phys. list

Field

Kernel

Event Generator

Pluto++/Chan.

G4 Interface

MC Simulation started

Event Generator = Pluto++ + Single Channel simu.

pppp pdpp(n)pp elastic ds/d in c.m.

P in Lab

in Lab

pppN*(K+)

pppp*(K+K-)

Feasibility Study of ppppppK+K in FTD

FTD Construction in Geant4

Track Finding and momentum reconstruction

Elect. DrfitEne. Depos. Digi.Hit

Tracking+Rescon.

Invariant mass spectrum of K+ K-。

FTD: MWDC PrototypeFTD: MWDC Prototype

Able to assemble large area MWDC Various MWDC Prototypes have been made and the

performance have been tested.

Wiring machine MWDC prototype

MWDC tested by cosmicMWDC tested by cosmic

Hit multiplicityHit multiplicity

Total Hit Multi.Total Hit Multi.

drift spec.drift spec.

Layer Layer multiplicitymultiplicity

MWDC tested by cosmicMWDC tested by cosmic

Eff. VS. HVEff. VS. HVGain VS. HV Gain VS. HV (85%Ar+15%CO(85%Ar+15%CO22))

Tracking Tracking residualresidual

VS. ResidualVS. Residual

Position Resolution Position Resolution =210=210mm

TPC Prototype TPC Prototype （（ R&D in Tsinghua Univ. R&D in Tsinghua Univ. ））

TPCTPC Test results (provided by Yulan Li from THU) Test results (provided by Yulan Li from THU) Spatial Resolution and Working Gas

Resolution achieved: 100 m @ 1T & 10 cm drift distance

Transverse resolution with P10 gas at B = 1.0 T

Transverse resolution with Ar:CF4:i-C4H10=94:3:3 gas at 1 T

Transverse resolution with Ar:CF4:i-C4H10=94:3:3 gas

Width of pad response with Ar:CF4:i-C4H10=94:3:3 gas

EMC Calorimeter R&DEMC Calorimeter R&D

CsI crystal grown in IMP. Performance ensured.

CsI single unit tested with heavy ion beamCsI single unit tested with heavy ion beam

101010 sample coupled to APD 202020 sample coupled to PD101010 sample coupled to PD

Tested at IMP

IMP3 2×2 inch

IMP11×1 inch

IMP21×1 inch

S.C.H1×1 inch

sample Peak channels

IMP1 1836.6 1835.0 1836.0

IMP2 1788.2 1791.7 1788.0

IMP3 1729.2 1728.3 1729.0

S.C.H 1463.7 1463.5 1464.0

Peak channel Increment

Before irradiation 1730.0

After 100 rad 1696.9 -1.9%

After 1000 rad 1611.6 -6.8%

R&D of the targetR&D of the target

Pellet LDPT

Pellet Pellet

(in collaboration with Upp. & COSY )

LDPTLDPT

(in collaboration with Duke)

To do List

1 Simulation 2 Concept Design Report Version03 Detector R&D

( 要得到资助，可能需要将工作做到一定程度 要将工作做到一定程度，需要形成合作 我们需要建立一个合作组 )

Full Simulation

1 Platform (Root and G4-Based) （ THU &IMP）2 TPC (构建／信号／数字化／重建 )

3 TOF (构建／信号／数字化／重建 )

4 EMC (构建／信号／数字化／重建 )

5 FTD (构建／信号／数字化／重建 ) （ THU）6 I/O and integration

CD0 Writing

1 Physics Interest

1). 2). 3). … (统计条件，相空间分布 ) 2 条件和初步设计 （ Tsinghua） 3 模拟现状和计划 （ Tsinghua） 4 子探测器预研计划与进展 5 Collaboration List   and Responsibility