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STAR Newsletter #70, February 2000
  Editor: Kathy Turner

Contents

  1. Headline News - from the management
  2. General News - Operations/Safety/Management/Meetings/etc.
  3. Data-Taking at STAR
  4. Contributions - Detector and Subsystem
  5. Contributions - Physics Groups
  6. People: Comings and Goings
  7. Employment Opportunities

  1. Headline News

    Spokesman's contribution:

    I wish to thank Bill Christie for being in charge of the STAR Newsletter since June 1994. Bill's new responsibilities in STAR have higher priority and preclude his continuing as editor of the newsletter. His column "Christie's Corner" in the newsletter will be missed, although Bill can be seen at the STAR Hall every day.

    As most of you are aware, STAR has made a transition from the STAR detector project to an operationing detector. What this is meant to convey is that there are many changes in responsibilities in STAR. I again congratulate Jay Marx and the STAR Technical Committee of Project Leaders for their successful construction and installation of the STAR baseline. I wish to point out that the new STAR Operations Group at BNL is in charge of the operation of the STAR detector and facility. This also includes installation of any additional detector components into STAR. Bill Christie is the STAR Detector Support Group Leader, and Ralph Brown is the STAR Technical Support Group Leader. Both work in the STAR Group at BNL under Tim Hallman. The STAR Detector Support Group consists of the STAR Subsystem Managers of the various detector components in STAR.

    The Council has voted to accept the Report of the STAR Shift Policy Committee. The policy can be found on the web under "organization" in the "table of contents" on the STAR homepage. I wish to thank the committee members - Bill Christie, Peter Jacobs, Jack Sandweiss, Jim Thomas, Gary Westfall, John Nelson, and Chuck Whitten (chair) for their hard work on this important task.

    The Council has voted to accept the proposal of the Chinese groups from Institute of High Energy Physics - Beijing, and the Institute of Particle Physics - Wuhan to join STAR. These groups have committed to take on major responsibilities for the Time-of-Flight patch detector. we enthusiastically welcome both groups.

    The STAR Time-of-Flight Patch detector system was reviewed and approved by a STAR review committee in October 1999. Subsequently, the proposal was approved in December by BNL for installation of the TOFp into STAR starting this year. I wish to thank the STAR review committee of R. Bellwied (chair), S. Margetis, M. LeVine, T. Ljubicic, J. Thomas, H. Wieman, H. Matis, and R. Majka for their careful work. I also thank Bill Llope and the STAR TOFp group for their rapid progress on the TOFp project. We have made arrangements for the TOFp to receive capital equipment funds from BNL for its construction. The STAR TOFp will now undergo the usual final design review by STAR, prior to installation. We look forward its installation into STAR this year.

    The Level 3 Trigger project is moving ahead rapidly with 12 new Alpha processors installed and testing with cosmic triggering. Please see their webpages under group documents for more information. It is anticipated that there will be sufficient information gained from the present partial Level 3 implementation by early summer to enable a review and proposal to complete the implementation of Level 3 triggering over the next year or two. Congratulations to the STAR Level 3 group for its progress.

    The STAR Forward TPC Project is also progressing rapidly. The first FTP chamber has been constructed, is equipped with 30 readout chambers, and holds chamber. The field cage and chambers are now being tested with HV. The FTPC electronics have been tested, exhibit low noise, and are still being optimized. Preparations are underway for transportation of the one FTPC to BNL next month, with a plan to install during the short PHOBOS-requested shutdown early in the run.

    A few notes of importance of which most people are aware - a single SVT ladder has been installed into STAR for testing, 4 EMC barrel modules have been installed, and the RICH detector has been installed and is operational in STAR for the first RHIC physics run.

    I wish to congratulate the Indiana University group and collaborators on the STAR End Cap EMC for their successful approval for funding from the NSF. This is a tremendous success and we look forward to the benefits that the STAR Spin Physics Program will reap in the future from this new detector once installed into STAR.

    The next STAR Collaboration Meeting will be held at BNL on August 4, 5 and possibly the 6th. We hope to have had collisions, data-taking, and some real discussion of data from STAR by then.

        - John Harris

  • General News - Operations/Safety/Management/Meetings/Etc.

  • Data-Taking at STAR

    The STAR experiment is currently in a commissioning phase. In the past week, approximately 30k cosmic events were taken with no magnetic field, and a few hundred with full field were taken on Fri, 2/25 before the magnet shutdown. We anticipate getting lots of field-on data this coming week (2/28-3/3), as well as laser data (with both halves of the TPC), before the run ends on Mar 3. Data has been taken with the Rich,TPC, SVT and L3 systems. The DAQ system worked reliably. The L3 trigger has enhanced the data-taking abilities. The MWC has been demonstrated to work.

  • Contributions - Detector and Subsystem

    (these are in random order)

  • Contributions - Physics Groups

    • Peripheral Collisions (from Spencer Klein)

      Since last summer, the peripheral collisions working group has made much progress, in simulation and reconstruction software and in triggering. Janet Seger has written a new photon-Pomeron event generator which is almost ready for production. Joakim Nystrand and Akio Ogawa have found and fixed numerous bugs in bfc that caused it to crash for low multiplicity events. As part of this, Joakim wrote a new low-multiplicity vertex finder which is now standard for low multiplicity events. Soeren Lange has been considering how to implement our algorithms in the Level 3 trigger.

      We continue to better define our physics. Spencer and Joakim finished a paper (appear in Phys. Rev. Lett.) about interference in the reaction A + A --> A + A + rho/omega/phi/J/psi. This reaction can occur in two ways: nucleus 1 can emit a photon which scatters off nucleus 2, or nucleus 2 can emit a photon which scatters off nucleus 1. The two pathways are indistinguishable, so the amplitudes add. The photon is long-ranged and the scattering short ranged, so the two nuclei act as two distinct emitters, like a two slit interferometer. Because vector mesons are negative parity, emission from the two 'slits' interferes destructively. So, for meson p_t < hbar/b, emission is suppressed. For the rho, with a a median impact parameter of 40 fermi, production with p_t < 5 MeV/c is suppressed. Because the low p_t rho decays to two high p_t pions, this effect can be easily studied by STAR.

  • People: Comings and Goings

    Coming:

    • Chris Allgower, Indiana Univ. (postdoc)
    • John Amonett, Kent (student)
    • Olga Baranikova, Purdue (postdoc)
    • Lee Barnby, Kent (postdoc)
    • Alex Cardenas, Purdue (student)
    • Subhasis Chattopadhyay, Wayne State (postdoc)
    • Bum Choi, Univ. of Texas (student)
    • Jon Gans, Yale (student)
    • Frank Guerts, Rice (postdoc)
    • Tim Herston, Purdue (student)
    • Ian Johnson, LBNL (student)
    • Masashi Kaneta, LBNL (postdoc)
    • Tony Krupien, BNL (STAR Facilities Manager)
    • Chris Kunz, Carnegie Mellon (student)
    • Curtis Lansdell, Univ. of Texas (student)
    • Qingjun Liu, U. of Washington (postdoc) - starting in April
    • Gaspare LoCurto, Munich (postdoc)
    • Zubayer Muhammed, Purdue (postdoc)
    • Benjamin Norman, Kent (student)
    • Alex Pozamantir, Purdue (postdoc)

    Going:

    • Hank Arneson will be retiring from BNL in March 2000.
    • Dave Dayton retired from BNL in late 1999.
    • Naomi Feiman left Yale to go to grad school
    • Bill Love retired from BNL in Fall 1999, but luckily he is still very active on STAR!
    • Dan Russ left Carnegie Mellon in Fall 1999 to join Raytheon at NASA Goddard Space Flight Center.
    • Markus Schulz left the BNL (DAQ group) in Fall 1999 to go to Heidelberg Univ.
    • Kathy Turner will be leaving BNL in July 2000 to go to DOE.

  • Employment Opportunities