Status of the Phobos experiment at RHIC http
Status of the Phobos experiment at RHIC http: //phobos-srv. chm. bnl. gov/ S. Manly Univ. of Rochester (http: //hertz. pas. rochester. edu/smanly/) for the Phobos Collaboration RHIC 2000 Workshop Park City, Utah March 11 -18, 2000 S. Manly - RHIC 2000 - Park City 3/00
Phobos Collaboration ARGONNE NATIONAL LABORATORY Birger Back, Nigel George, Alan Wuosmaa BROOKHAVEN NATIONAL LABORATORY Mark Baker, Donald Barton, Alan Carroll, Stephen Gushue, George Heintzelman, Louis Remsberg, Peter Steinberg, Andrei Sukhanov INSTITUTE OF NUCLEAR PHYSICS, KRAKOW Andrzej Budzanowski, Kazimierz Galuszka, Jan Godlewski , Jerzy Halik, Roman Holynski, Jerzy Kotula, Marian Lemler, Jozef Ligocki, Jerzy Michalowski, Andrzej Olszewski , Pawel Sawicki Marek Stodulski, Adam Trzupek, Barbara Wosiek, Krzysztof Wozniak, Pawel Zychowski JAGELLONIAN UNIVERSITY, KRAKOW Andrzej Bialas, Wieslaw Czyz, Kacper Zalewski MASSACHUSETTS 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 Lin, Jaw. Luen Tang UNIVERSITY OF ROCHESTER Erik Johnson, Steven Manly, Robert Pak, Inkyu Park, Yanting Wang, Frank Wolfs UNIVERSITY OF ILLINOIS AT CHICAGO Russell Betts, Clive Halliwell, Burt Holzman, Judith Katzy, Wojtek Kucewicz, Don Mc. Leod, Rachid Nouicer, Michael Reuter UNIVERSITY OF MARYLAND Richard Baum, Richard Bindel, Edmundo Garcia-Solis, Alice Mignerey *Spokesperson Also with Brookhaven National Laboratory S. Manly - RHIC 2000 - Park City 3/00
spectrometer time of flight magnet multiplicity detectors v 4 p detector measuring charged particle multiplicity and d N/d df v multiparticle spectrometer covers 1% solid angle at midrapidity with low Pt threshold and good particle identification v Time-of-flight walls v Trigger counters S. Manly - RHIC 2000 - Park City 3/00
Primary detector technology Silicon strips and pads 300 microns Silicon detector scheme signal lines bias bus Dielectric 2 Dielectric 1 vias p+ Implant metal 2 metal 1 Polysilicon Drain Resistor n+ +HV S. Manly - RHIC 2000 - Park City 3/00
Multiplicity array < 5. 3 -3. 1 < < 3. 1 -5. 3 < 5. 04 m 2. 35 m 1. 13 m 0. 55 m -1. 13 m -2. 35 m -5. 05 m z • 85% of 4 p covered • Charged part. multiplicity d 2 N/d d (j is azimuthal angle to beam) D = 0. 1 and D =p/4 • Distinguish multiple hits by the energy deposition S. Manly - RHIC 2000 - Park City 3/00
Multiplicity determination (event-by-event) S. Manly - RHIC 2000 - Park City 3/00
The vertex detector -12. 5 cm 11. 8 cm 5. 6 cm x Beam Vertex detector z Octagon multiplicity detector S. Manly - RHIC 2000 - Park City 3/00
Two-arm multiparticle Spectrometer p- 1 Ge. V/c p- 100 Me. V/c p+ adjustable separation v 2 Tesla conventional magnet vlow field region helps with pattern recognition v. Particle ID via d. E/dx S. Manly - RHIC 2000 - Park City 3/00
Spectrometer performance S. Manly - RHIC 2000 - Park City 3/00
S. Manly - RHIC 2000 - Park City 3/00
Spectrometer physics v Pt spectra v correlations v phi mass, width v particle ratios S. Manly - RHIC 2000 - Park City 3/00
magnet RHIC!! Danfysik S. Manly - RHIC 2000 - Park City 3/00
Phobos Sensor Production Vertex and Multiplicity NCU Taiwan: Production & Pre-Testing DHL MIT and UIC: Testing Spectrometer S. Manly - RHIC 2000 - Park City 3/00
Silicon detector assembly and testing Hughes 2470 -V bonder Inspection stations Si detectors mounted on spectrometer cooling/support frame Gluing Station Clean Rooms Probe Stations S. Manly - RHIC 2000 - Park City 3/00
S. Manly - RHIC 2000 - Park City 3/00
Trigger Counters Cherenkov counters (548 cm) ir Paddle counters (321 cm) Cherenkov counters S. Manly - RHIC 2000 - Park City 3/00
Cherenkov counters Paddle counters Proud dad ZDC S. Manly - RHIC 2000 - Park City 3/00
Time-of-flight system Hamamatsu R 5900 -00 -M 4 MOD 12 stage multi-anode PMTs BC-404 fast plastic from Bicron S. Manly - RHIC 2000 - Park City 3/00
S. Manly - RHIC 2000 - Park City 3/00
Si Bias S. Manly - RHIC 2000 - Park City 3/00
Event Builder S. Manly - RHIC 2000 - Park City 3/00
Test beams S. Manly - RHIC 2000 - Park City 3/00
Engineering Run - summer 99 S. Manly - RHIC 2000 - Park City 3/00
S. Manly - RHIC 2000 - Park City 3/00
Software Root/C++ S. Manly - RHIC 2000 - Park City 3/00
Run Plan Time-of-Flight Walls v Detector has been assembled (Dec. -Jan. ), >95% success rate v Start current run with setup similar to what we had in engineering run Spectrometer v ~two week shutdown after machine becomes stable, install full (1. 5 arms) detector v second arm modules finished by end of the summer Octagon and Vertex Detector Magnet Ring Detectors S. Manly - RHIC 2000 - Park City 3/00
Phobos physics • high rate • large acceptance in eta for multiplicity detector • low Pt acceptance • use global event characteristics (multiplicity, fluctuations in dn/deta) event-by-event as criteria to form inclusive samples to study in more detail with spectrometer/TOF • multiplicity (and fluctuations), spectra, phi meson, particle correlations S. Manly - RHIC 2000 - Park City 3/00
Preliminary studies at Rochester of sensitivity to global K/ and ratios P in Ge. V/c Angle in degrees S. Manly - RHIC 2000 - Park City 3/00
S. Manly - RHIC 2000 - Park City 3/00
A discriminator that uses multiplicity detector information A B C S. Manly - RHIC 2000 - Park City 3/00
K/pi = 3. 5% K/pi = 12. 5% S. Manly - RHIC 2000 - Park City 3/00
Studying use of vertex detector to separate events with fluctuations in kaons vs. baryons Vtx layer 2 Vtx layer 1 S. Manly - RHIC 2000 - Park City 3/00
Preliminary studies on flow reconstruction in the Phobos multiplicity detector S. Manly - RHIC 2000 - Park City 3/00
• 100 RQMD events at each of +90, +45, 0, -45, -90 degrees • Use hit multiplicity in map with granularity 0. 05( )x 0. 2( ) and fit coordinate anisotropy (integrates over particle species and momenta) • Offset vertex to avoid area around spectrometer holes for initial study • Can reconstruct reaction plane to approximately 0. 5 radians S. Manly - RHIC 2000 - Park City 3/00
Summary: Phobos is in excellent shape and will be ready to do physics in year 1! In addition to the usual Phobos physics program, recent preliminary studies at Rochester indicate Phobos may be sensitive to integrated species flow, K/ , and on an event-by-event basis in region | |<3. 1. Work is continuing … hopefully with real data soon!! S. Manly - RHIC 2000 - Park City 3/00
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