PHENIX RPC in ChinaPHENIX RPC in China

Li Ye Shouyang Hu XiaomeLi Ye Shouyang Hu Xiaomei LIi LI

China Institute of Atomic EnergyChina Institute of Atomic Energy

2009. 082009. 08

OutlineOutline

1.Motivation of the PHENIX Forward Upgradeof the PHENIX Forward Upgrade

2.Study of PHENIX-RPC in China

3.Laboratory construction at CIAE3.Laboratory construction at CIAE

4.The task of PHENIX-China group4.The task of PHENIX-China group

5.Perspective of PHENIX-RPC in China5.Perspective of PHENIX-RPC in China

1. Motivation of the PHENIX 1. Motivation of the PHENIX Forward UpgradeForward Upgrade

Motivation of the PHENIX Forward Motivation of the PHENIX Forward UpgradeUpgrade

Add RPC ( Resistive Plate Chamber)Resistive Plate Chamber) as a fast muon trigger to study the quark-gluon structure of the proton by observing W-bosons from colliding polarized proton beams at RHIC.

.

Motivation of the PHENIX Forward Motivation of the PHENIX Forward UpgradeUpgrade

1.a fast online measurement of the muon momentum to reject low momentum muons from hadron decays in jets

2.on a coarse timing measurements to remove background correlated with the incoming proton beam bunches.

2. Study of PHENIX RPC Study of PHENIX RPC Detector in ChinaDetector in China

• Bakelite resistivity 10 10- 10 12 cm• Gas Gap: 2 mm Gas pressure : ~ 1 Atm Gas mixture: F134a, Isobutane, SF6

• HV electrodes : 100 m graphite• Read-out strips

Structure of RPCStructure of RPC

The Basics of RPCThe Basics of RPC

Advantage: easy and cheap Two modes: Avalanche and Streamer

PHENIX-RPC will work at avalanche

mode to ensure the proper operation at

very high rate.

RPC Prototype Made in ChinaRPC Prototype Made in China Size: 43×43 × 0.6 cm3

Graphite coat: 40 × 40 cm2 Double gas-gaps: 2 mm each Read-out strip placed between the two gas-gaps bakelite resistivity: ~ 10 10- 10 12 cm

Beam Test at RHIC Run5Beam Test at RHIC Run5

RPC1RPC2

•RPC1 Grounded to Platform•RPC2 Grounded to MUID Gas Panel

Test Result at BNLTest Result at BNL

Cosmic

RPCCosmic &&

RPC

RPCSC1SC1

Shielding

Top View test location Cosmic ray test result

3. Laboratory construction at CIAELaboratory construction at CIAE

Main goals:Train students and technicians for

future QA and assembly

Test prototypes

Research & Development

Laboratory construction at CIAELaboratory construction at CIAE

located at the building of HI-13 tandem accelerator

Laboratory construction at CIAELaboratory construction at CIAE

The New prototype (No.1)

Two new prototypes: The resistivitiesresistivities of the bakelites of prototypes are around 1012cm.The sizes are same as PHENIX RPC2A design.

The New Prototype (No.2)

The upstream of Prototype No.2 is separated into two parts and

the readout strips are jointed with ground by matched resistances.

Laboratory construction at CIAELaboratory construction at CIAEThe RPC test multilayer ： 2.0×1.0×0.8 m3, 9 detector supporting layers in total, can test 5-7 RPCs at the same time.

Laboratory construction at CIAELaboratory construction at CIAE

Has equipped gas system, electronics and DAQ system.

Experimental Set-up

RPC

Plastic scintillator

Plastic scintillator

F134a

C4H10

SF6

Gas system

CFD

CFD

CFD

Logical unit

Start stop

TACMCAcomputer

HV

DGG

DGG

Ns-delay line

preampl i fi er

oscilloscope

Prototype Test at CIAEPrototype Test at CIAE Current gas mixture: 90.1% F134a,

9% Isobutane and 0.9% SF6

Time resolution <2.0 ns

Comparing the Signals from Avalanche Mode and Streamer Mode

Avalanche mode Streamer mode

RPC working voltage=9800V RPC working voltage=10200V

The chambers have high noises from 9000V to 9800 V

Prototype Test at CIAEPrototype Test at CIAE

We changed HV and the ratio of the gases to study time resolution.

For different gas mixtures, we got best time resolutions at different HVs.

The HV of the best resolution moves ahead as the ratio of SF6 increases

4. The Task of PHENIX-China groupThe Task of PHENIX-China group

Some Collaborators

GSU UIUC Korea Uni. CIAE

Prototype Development & QA

Gas mixingPosition resolution

ChamberProduction

MechanicalcomponentsAssembly &QA

The RPC chambers is manufactured at Korea The RPC chambers is manufactured at Korea University and all other mechanical parts are University and all other mechanical parts are made in China.made in China.

CIAE will also take care of the CIAE will also take care of the QA and assembly.

The Task of PHENIX-China groupThe Task of PHENIX-China group

5. Perspective of PHENIX-RPC in ChinaPerspective of PHENIX-RPC in China

Time Schedule

Summer 2009 Summer 2010 Summer 2011

RPCs RPC 3

North & South

RPC 1

North & South

RPC 2

North & South?

RPC test lab in CIAE:

Research &DevelopmentExperienceGood collaborators Man power

What do we have now?What do we have now?

中国原子能院中高能物理组（ CIHENP）

Confidence!

Thanks!