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| STAR Newsletter #70, February 2000 | |
| Editor: Kathy Turner | |
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.
The people in the group are Ralph Brown, Tony Krupien, Craig Consiglio, John Scheblein, Alexei Lebedev, a tech from C-AD (paid for 3/4 by us), and an admin person (this is a new hire, which is ongoing now). These people all used to be in the RHIC Department; since the RHIC Department is no more, they are now in the Physics Department.
The group has in it the subsystem managers for components of the STAR Detector which have been delivered and are operating as part of the year-1 STAR Detector.
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.
We started bringing the TPC systems up at the beginning of February for the anticipated cosmic ray run. P10 was put into the TPC on Feb 14 and, after some initial difficulties with instabilities, the gas system has been running smoothly. We are running in recirculation mode during the day and switching to a slow purge overnight.
At the beginning of the month Craig Consiglio made a large effort to fix and/or replace the remaining FEE/RDO problems. By the time the pole tips went in the electronics were in the best shape ever.
Some time was devoted to commissioning the MWC trigger cards and the LBL people were able to get one day of running to get some data sets to analyze offline. Some noise problems remain that require further study.
We were also able to solve a long term problem with noise showing up in the TPC for time bins less than 10. This was thought to be due to gated grid switching noise, but the problem was traced to an incorrect pedestal subtraction. All noise below time bin 10 is now gone.
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 week, as well as laser data, before the run ends on Mar 3.
...good progress continues. FEE version 6 (Final) with Remote Threshold Control was completed last week and is now under test. For TOFp, we're presently just tidying up a few mechanical loose ends in preparation for the FDR which is unscheduled but hopefully will be in early April. The safety review for TOFp was last December and we are preparing for the same for the pVPD also to be in early April. Simulations on specifically the pVPD are soon to be released as a STAR Note. The only major effort regarding the pVPD now concentrates on defining the mounting approach. Progress on the DAQ/TRG interfaces for the TOFp/pVPD Systems is being made in China, and these groups ordered 25 PMTs in January. While there is no official word yet, rumors are that the remaining funding for the TOFp/pVPD construction (80k$) may soon be allocated. The present estimate is that the TOFp and pVPD Detectors and related systems will be at BNL and ready for installation 4.5 months after this final funding is in hand. Finally, I am happy to welcome Dr. Frank Guerts to Rice and the STAR-TOFp Project. He's from Utrecht and will be devoting his talents to TOFp software and the TOFp/pVPD commissioning efforts early this Summer.
We have been working hard on the MWPC system which is needed to trigger on peripheral collisions. The hardware was installed last summer, and Spencer, Joakim and Hans Georg Ritter have recently begun testing and commissioning. Vladimir Morozov is deep in the midst of a detailed simulation program that will properly account for ion drift times and electronics shaping.
The Endcap EMC, which will play a crucial role in the p+p spin physics program for STAR, is now firmly attached to the real axis. A Major Research Instrumentation grant ($1.85M) from the US NSF was awarded in September 1999, with an additional $2.34M coming from the NSF Physics Division over the next three years. Mechanical and optical designs for the calorimeter towers and the scintillating strip shower-maximum detector (SMD) are close to being finalized, and were reviewed favorably at a Technical Design Review held two weeks ago. (The associated technical report, along with related documents, can be obtained via anonymous ftp from ftp.iucf.indiana.edu in the pub/iustar subdirectory, in either pdf or gzipped ps format.) A complete EEMC prototype, containing 12 towers and two planes of SMD strips, has been built and tested successfully with cosmic rays and beams of 5-20 GeV electrons at SLAC. In preparation for many months of megatile fabrication, a high-speed routing machine has recently been installed at IUCF. Additional details on the detector PMT's, electronics, and plans for calibration and diagnostic systems can be found in the TDR. The endcap group is presently in the process of adding new collaborators to help with the EEMC construction and spin physics analysis.
The picture (at the WWW address shown below) shows one of the cosmic events triggered on 02/25/00. For the first time, the level-3 trigger made a yes/no event building decision, based upon a level-3 algorithm (in this case simply "there is a track !"). The event was processed in 20 ms (B field off, color corresponds to cluster ADC sum, black lines are reconstructed track helices, no further post-analysis).
http://ikf1.star.bnl.gov/l3/selftrigger1.jpg
Dear FTPC colleagues and friends,
If you have a short look on the FTPC homepage under NEWS you will see some progress:
Both points together have been the reason for a little celebration with all our technicians last Wednesday!
Parallel to the test program the preparation for the transport to Brookhaven is under way.
Greetings from Munich, with a first touch of spring outside, The proposal to add a preshower photon multiplicity detector (PMD) to STAR has been revived after some gap. The PMD is an Indian proposal from the team working at CERN in the WA98 and ALICE experiments. The physics potential of the PMD had been earlier evaluated by a STAR review panel chaired by Huan Huang of UCLA and had recommended its inclusion to STAR in Jan. 1998. Since then the R&D part of the PMD has been extensively persued and the PMD has been approved to be a part of the ALICE experiment at the LHC.
As part of revival, Y.P. Viyogi and Murthy S. ganti of VECC, Calcutta visited BNL during the week of 18-21 Jan. 2000 and had extensive discussions on all aspects of integration with Ralph Brown, Bill Christie, Tim Hallman, Mike Levine and others. The team is now working on a technical design report to be submitted to the STAR collaboration for further consideration.
The third Mock Data Challenge (MDC3) will be held March 26 - April 9, 2000. MDC3 will be a STAR-only exercise directed at physics analysis, exercising physics analysis software, analysis infrastructure and CAS tools and facilities. More info is available from the MDC3 Home page
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.
Going:
Anybody can add items!
Shown are conferences of interest, who is giving STAR-related talks, and links to their slides and/or proceedings.
A publication list is available for each year in Latex or postscript form. They are separated into 3 types: journal publications, conference proceedings, and proposals and reports.
(these are in random order)
Coming:
CARNEGIE MELLON UNIVERSITY
Postdoctoral Position in Relativistic Heavy Ion Collisions
______________________________________________________________
The Nuclear Heavy Ion Group at Carnegie Mellon University (CMU) has an
immediate opening for an experimental postdoctoral researcher. The group
is actively involved with the Trigger subsystem for the STAR Detector at
RHIC, as well as participating in several STAR physics analysis working
groups. The successful candidate will be expected to be in full-time
residence at Brookhaven National Laboratory, and to participate in all
aspects of the CMU group's research program. With the initial STAR physics
run beginning later this year, the major activities will involve operation
and continued development of the STAR trigger system and analysis of STAR
data within the framework of the STAR spectra and strangeness physics
working groups. Specific physics emphasis has some flexibility, depending
on the candidate's experience and interests. Outstanding computational
resources are available at CMU as well as at BNL. The initial appointment
will be for one year, with the expectation (assuming mutual agreement) for
renewal well into the STAR/RHIC running time frame.
Candidates are invited to contact Professor Morton Kaplan as soon as
possible by e-mail or snail-mail (addresses below). To expedite the full
consideration of applicants, please arrange for your CV, statement of
research interests, and three letters of recommendation to be sent directly
to:
Professor Morton Kaplan
Carnegie Mellon University
4400 Fifth Avenue
Pittsburgh, Pennsylvania 15213-2683
(e-mail: kaplan@cmchem.chem.cmu.edu)
Carnegie Mellon University is an EO/AA employer.
FACULTY POSITION IN EXPERIMENTAL
NUCLEAR/PARTICLE PHYSICS
INDIANA UNIVERSITY
Applications are invited for a junior tenure-track faculty position
in the Physics Department of Indiana University to start in Fall 2000.
We seek outstanding candidates with demonstrated leadership potential
in forefront experimental research at the interface of nuclear and
particle physics. Indiana physicists are currently playing major
roles in developing programs to study nucleon spin structure with
polarized proton beams at the Relativistic Heavy Ion Collider, hadron
spectroscopy with photon beams (Hall D) at the Thomas Jefferson
National Accelerator Facility, and fundamental symmetry tests with
low-energy neutron beams at the Los Alamos Neutron Scattering Center
and the National Institute of Standards and Technology. More information
concerning these programs and the Physics Department can be accessed on
the web at http://dustbunny.physics.indiana.edu/facpos/. A new faculty
member will be expected either to markedly enhance the efforts in one of
these areas or to help establish a viable new research program in an
interface area of comparable impact. The successful candidate should
also have demonstrated ability and desire to teach physics at the
undergraduate and graduate levels. Each applicant should submit a
curriculum vitae, a description of research interests and accomplishments,
and a list of publications, and arrange for three letters of
reference to be sent independently to: Faculty Search Committee, c/o
Professor Alan Kostelecky, Chair, Department of Physics, Swain Hall
West 117, Indiana University, Bloomington, IN 47405, U.S.A. Applications
received before February 1, 2000 may receive preference. Indiana University
is an Equal Opportunity/Affirmative Action Employer.
LBNL - postdoc
The LBNL relativistic nuclear collisions group is looking for a
postdoc, to start this spring, to work on commissioning and data
analysis from the STAR detector at RHIC. STAR expects to take it's
first data this year, so the timing is excellent.
The successful candidate will work with Spencer Klein on peripheral
collisions of
heavy ions. He or she will replace Joakim Nystrand, who is returning
to Sweden to take a staff position. The group is studying coherent
interactions of nuclei, such as two-photon physics and photonuclear
interactions. Specific topics include strong field QED (single and
multiple e^+e^- pair production), vector meson production (Pomeron
physics and vector meson-nucleon cross sections), interference and
multiple vector meson production (meson interferometry) and meson
spectroscopy (searches for exotica such as glueballs, meson properties
and decays). Because of the strong fields accompanying heavy ions,
the rates for these processes are high. This is a completely new
field, with lots of opportunity for innovation.
Candidates should have a PhD in experimental particle or nuclear
physics or a related field. Strong computer skills are a major plus,
as is some hardware experience.
Anyone interested in peripheral collisions should contact Spencer
Klein at SRKLEIN@LBL.GOV or (510)486-5470.
LBNL
Five Year Fellowship in Experimental High Energy Nuclear Physics
The Lawrence Berkeley National Laboratory^ñs Nuclear Science Division is
seeking a person with outstanding promise and creative ability in the field
of experimental high energy nuclear physics. The appointment will be as
Divisional Fellow for a term of five years with the expectation of
promotion to Senior Scientist, upon successful review. The successful
candidate will have several years of experience beyond the Ph.D. in nuclear
or particle physics and is expected to assume a leadership role in the
Relativistic Nuclear Collisions (RNC) Program at LBNL.
The RNC group has a leading role in the STAR experiment at the Relativistic
Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. The group
currently has a strong physics program in nucleus-nucleus collisions at
RHIC. Candidates having an interest in all aspects of RHIC physics,
including spin, are encouraged to apply.
Applicants are requested to e-mail (our preferred method) curriculum
vitae, list of publications, statement of research interests, and the names
of at least four references, no later than May 31, 2000 to:
HGRitter@lbl.gov. Please reference job number NS 011700. You can also
visit our website at www.lbl.gov/CJO. Berkeley Lab is an AA/EEO employer.
LBNL - postdoc
The Relativistic Nuclear Collisions Program (RNC) of the Nuclear Science
Division at Lawrence Berkeley National Laboratory is seeking outstanding
candidates to fill a postdoc position for the spring of 2000. The RNC
Program plays a lead role in the STAR experiment at the Relativistic Heavy
Ion Collider (RHIC) at BNL. Candidates having interests in all aspects of
heavy ion physics at RHIC are invited to apply. We are especially seeking
to expand our efforts in the areas of high pT physics and heavy flavor
production. In STAR, RNC has major responsibilities for the central TPC
detector, TPC electronics, and related software. We also have strong
detector R&D programs and we are beginning to exploit the National Energy
Research Supercomputing Center at LBNL which provides a valuable computing
resource to the Nuclear and High Energy Physics communities.
This is a two-year term appointment with the possibility of renewal.
Interested candidates should have obtained a Ph.D. in nuclear or high
energy physics within the last three years.
To apply, please send a CV, a list of publications and the names of three
references via email (our preferred method) to: HGRitter@lbl.gov.
BNL - senior level Physicist on STAR
The job description has been posted, go there
BNL - Deputy Software and Computing Leader
(to become S&C Leader when Torre transitions completely to ATLAS)
The job description has been posted, go there