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S.Manly - RHIC 2000 - Park City 3/00 Status of the Phobos experiment at RHIC S.Manly Univ. of Rochester (http://hertz.pas.rochester.edu/smanly/) for the.

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Presentation on theme: "S.Manly - RHIC 2000 - Park City 3/00 Status of the Phobos experiment at RHIC S.Manly Univ. of Rochester (http://hertz.pas.rochester.edu/smanly/) for the."— Presentation transcript:

1 S.Manly - RHIC 2000 - Park City 3/00 Status of the Phobos experiment at RHIC 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 http://phobos-srv.chm.bnl.gov/

2 S.Manly - RHIC 2000 - Park City 3/00 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, JawLuen 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 McLeod, Rachid Nouicer, Michael Reuter UNIVERSITY OF MARYLAND Richard Baum, Richard Bindel, Edmundo Garcia-Solis, Alice Mignerey Phobos Collaboration *Spokesperson  Also with Brookhaven National Laboratory

3 S.Manly - RHIC 2000 - Park City 3/00 time of flight multiplicity detectors spectrometer magnet   4  detector measuring charged particle multiplicity and d N/d  d   multiparticle spectrometer covers 1% solid angle at midrapidity with low P t threshold and good particle identification  Time-of-flight walls  Trigger counters

4 S.Manly - RHIC 2000 - Park City 3/00 Silicon detector scheme +HV p+ Implant n+ Polysilicon Drain Resistor Dielectric 1 bias bussignal lines Dielectric 2vias metal 1 metal 2 Primary detector technology Silicon strips and pads 300 microns

5 S.Manly - RHIC 2000 - Park City 3/00 -0.55 m-5.05 m-2.35 m-1.13 m 0.55 m 1.13 m 2.35 m 5.04 m z      85% of 4  covered Charged part. multiplicity d 2 N/d  d  (  is azimuthal angle to beam)    and  Distinguish multiple hits by the energy deposition Multiplicity array

6 S.Manly - RHIC 2000 - Park City 3/00  Multiplicity determination (event-by-event)

7 S.Manly - RHIC 2000 - Park City 3/00 Beam z 12.5 cm -12.5 cm 11.8 cm 5.6 cm x The vertex detector Vertex detector Octagon multiplicity detector

8 S.Manly - RHIC 2000 - Park City 3/00 Two-arm multiparticle Spectrometer 100 MeV/c 1 GeV/c v2 Tesla conventional magnet vlow field region helps with pattern recognition vParticle ID via dE/dx 100 MeV/c ++  - adjustable separation --

9 S.Manly - RHIC 2000 - Park City 3/00 Spectrometer performance

10 S.Manly - RHIC 2000 - Park City 3/00

11 Spectrometer physics v Pt spectra v correlations v phi mass, width v particle ratios

12 S.Manly - RHIC 2000 - Park City 3/00 magnet Danfysik RHIC!!

13 S.Manly - RHIC 2000 - Park City 3/00 Phobos Sensor Production NCU Taiwan: Production & Pre-Testing MIT and UIC: Testing Spectrometer Vertex and Multiplicity DHL

14 S.Manly - RHIC 2000 - Park City 3/00 Silicon detector assembly and testing Clean Rooms Probe Stations Inspection stations Hughes 2470-V bonder Gluing Station Si detectors mounted on spectrometer cooling/support frame

15 S.Manly - RHIC 2000 - Park City 3/00

16 Trigger Counters Cherenkov counters Cherenkov counters (548 cm) Paddle counters (321 cm) ir

17 S.Manly - RHIC 2000 - Park City 3/00 Paddle counters Proud dad Cherenkov counters ZDC

18 S.Manly - RHIC 2000 - Park City 3/00 Time-of-flight system BC-404 fast plastic from Bicron Hamamatsu R5900-00-M4MOD 12 stage multi-anode PMTs

19 S.Manly - RHIC 2000 - Park City 3/00

20 Si Bias

21 S.Manly - RHIC 2000 - Park City 3/00 Event Builder

22 S.Manly - RHIC 2000 - Park City 3/00 Test beams

23 S.Manly - RHIC 2000 - Park City 3/00 Engineering Run - summer 99

24 S.Manly - RHIC 2000 - Park City 3/00

25 Root/C++ Software

26 S.Manly - RHIC 2000 - Park City 3/00 Run Plan Time-of-Flight Walls Ring Detectors Spectrometer Octagon and Vertex Detector Magnet  Detector has been assembled (Dec.-Jan.), >95% success rate  Start current run with setup similar to what we had in engineering run  ~two week shutdown after machine becomes stable, install full (1.5 arms) detector  second arm modules finished by end of the summer

27 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

28 S.Manly - RHIC 2000 - Park City 3/00 Preliminary studies at Rochester of sensitivity to global K/  and ratios Angle in degrees P in GeV/c

29 S.Manly - RHIC 2000 - Park City 3/00

30 ABC A discriminator that uses multiplicity detector information

31 S.Manly - RHIC 2000 - Park City 3/00 K/pi = 12.5%K/pi = 3.5%

32 S.Manly - RHIC 2000 - Park City 3/00 Studying use of vertex detector to separate events with fluctuations in kaons vs. baryons Vtx layer 1 Vtx layer 2

33 S.Manly - RHIC 2000 - Park City 3/00 Preliminary studies on flow reconstruction in the Phobos multiplicity detector

34 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(  )x0.2(  ) 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

35 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!!

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