Status of the Phobos experiment at RHIC

S.ManlyUniv. of Rochester

(http://maxwell.nsrl.rochester.edu/smanly/)

for the Phobos Collaboration

APS - AtlantaMarch 23, 1999

http://phobos-srv.lns.mit.edu

ARGONNE NATIONAL LABORATORY

Birger Back, Alan Wuosmaa BROOKHAVEN NATIONAL LABORATORY

Mark Baker, Donald Barton, Alan Carroll, Stephen Gushue, George Heinzelman, Louis Remsberg, Andrei SukhanovCASE-WESTERN RESERVE UNIVERSITY

Cyrus TaylorINSTITUTE OF NUCLEAR PHYSICS, KRAKOW

Wojciech Bogucki , Andrzej Budzanowski, Tomir Coghen, Kazimierz Galuszka, Jan Godlewski ,Roman Holynski, Jerzy Kotula, Marian Lemler, Jerzy Michalowski, Andrzej Olszewski, Pawel Sawicki

Marek Stodulski, Adam Trzupek, Barbara Wosiek, Krzysztof Wozniak, Pawel ZychowskiJAGELLONIAN UNIVERSITY, KRAKOW

Andrzej Bialas, Wieslaw Czyz, Kacper ZalewskiMASSACHUSETTS INSTITUTE OF TECHNOLOGY

Wit Busza*, Patrick Decowski, Kristjan Gulbrandsen, P. Haridas, Piotr Kulinich, Heinz Pernegger, Miro Plesko, Gunther Roland†, Leslie Rosenberg, Pradeep Sarin, Stephen Steadman, George Stephans, Gerrit van Nieuwenhuizen,

Carla Vale, Robin Verdier, Bernard Wadsworth, Bolek Wyslouch‡NATIONAL CENTRAL UNIVERSITY, TAIWAN

Yuan-Hann Chang, Augustine Chen, Willis LinUNIVERSITY OF ROCHESTER

Adam Hayes, Erik Johnson, Steven Manly, Robert Pak, Inkyu Park, Frank WolfsUNIVERSITY OF ILLINOIS AT CHICAGO

Russell Betts, Clive Halliwell, Burt Holzman, Judith Katzy, Wojtek Kucewicz, Don McLeod, Rachid Nouicer, Michael Reuter

UNIVERSITY OF MARYLANDEdmundo Garcia-Solis, Peter Stanskas, Alice Mignerey

*Spokesperson†At Goethe University, Frankfurt‡Project Manager

Phobos CollaborationPhobos Collaboration

4 detector measuring charged particle multiplicity and d N/dd

multiparticle spectrometer covers 1% solid angle at midrapidity with low Pt threshold and good particle identification

time of flightmultiplicitydetectors

spectrometer

magnet

Two detectors:

2

Silicon detector schema

+HV

p+ Implant

n+

Polysilicon Drain Resistor

Dielectric 1

bias bussignal lines

Dielectric 2 vias metal 1metal 1metal 2metal 2

Primary detector technology

Silicon strips and pads300 microns

-0.5

5 m

-5.0

4 m

-2.3

4 m

-1.1

3 m

0.5

5 m

1.1

3 m

2.3

4 m

5.0

4 m

z

• 85% of 4 covered• Charged part. multiplicity d2N/dd ( is azimuthal angle to beam) and • Distinguish multiple hits by the energy deposition

Multiplicity array

ddM

Multiplicity determination (event-by-event)

Beam

z

12.5 cm -12.5 cm

11 cm

5.5 cm

x

The vertex detector

Vertex detector

Octagonmultiplicity detector

Two-arm multiparticle Spectrometer100 MeV/c1 GeV/c

100 MeV/c+

-

adjustable separation

-

2 Tesla conventional magnet

low field region helps with pattern recognition

Particle ID via dE/dx

Spectrometer performance

Spectrometer physics

Pt spectra

correlations

phi mass, width

particle ratios

FacilitiesCounting house

Holes thru berm for cables

Cable trays

magnet

Danfysik

AGS

RHIC!!

Phobos Sensor Production

NCU Taiwan:Production &Pre-Testing

MIT and UIC: Testing

Spectrometer

Vertex and Multiplicity

DHL

Silicon detector assembly and testing

Clean Rooms

Probe Stations

Inspection stationsHughes 2470-V bonder

Gluing Station

Si detectors mounted on spectrometer

cooling/support frame

Trigger Counters

Time-of-flight system

BC-404 fast plastic from Bicron

Hamamatsu R5900-00-M4MOD 12 stage multi-anode PMTs

Si Bias

RIN-T (2 Slots)

PowerPC 200 MHz32 MB RAM

PowerPC 200 MHz32 MB RAM

Mercury™ RACEway™ System

A

B

C

D

ILK 8 Mercury Backplane ( 8 Slots - only 3 are shown here)

Standard VME Backplane

MVME 2604PowerPC withVxWorks 200 MHz32 MB RAM

To Event Builderover Ethernet

MCH6

A

B

C

D ROU-T (2 Slots)

PowerPC 200 MHz32 MB RAM

PowerPC 200 MHz32 MB RAM

MCH6

0 21

MCH6

A

B

C

D

PowerPC 200 MHz32 MB RAM

PowerPC 200 MHz32 MB RAM

PowerPC 75032MB DRAM

1MB SRAM L2 Cache32kB L1 Cache

FPDP

Event Builder

MV

ME

260

4M

VM

E 2

306

MV

ME

230

6

GigaEthernet to RCF

Gig

aEth

erne

t

CPUCPUCPU

Int D

iscs

Tape

Ext

Dis

cs

Fast Ethernet

Trigger VME

MV

ME

260

4Slow Control VMEFa

stE

ther

net

SUN HPC 3000

LAN

Trig

Inte

rface

Trig

Inte

rface

TOF FASTBUS

ADC TDC

Trig

AD

CTr

ig T

DC

SFI340

Trig

Sup

ervi

sor

Rac

eWay

Rac

eWay

Rac

eWay

Rac

eWay

Silicon VME

Test beams

pion dE/dx

20000

21000

22000

23000

24000

25000

0.1 1 10

momentum [GeV/c]

peak

sig

nal [

e-h]

Root/C++Software

Miscellaneous Time-of-Flight Walls

Ring Detectors

Spectrometer

Octagon and VertexDetector

Magnet

One spectrometer arm for year-one running

~20 silicon detectors (mostly multiplicity and vertex),DAQ, trigger, and parts of TOFinstalled for commissioning runthis summer

conclusions

•PHOBOS is becoming a reality

•Significant parts of PHOBOS will be installed forcommissioning run.

•Expect to be ready for day-1 physics (except for acompleted second arm)