SUMMARY OF CLAS Collaboration Meeting October 1-3, 1998 - S. Dytman For the October, 1998 CLAS collab mtg, format was changed some from previous meetings. There were 2 hours of results from g1 and e1 run periods with an emphasis on providing detail. There were also CALCOM summary talks; I assume there will be no need for CALCOM talks covering all detector systems in the future. Instead, I plan to have a few selected talks on important subjects. Significant advances were made in coordinating CLAS service work and conference speakers. A new Charter mod and 2 new by-laws were presented and passed covering CLAS Speaker policy. These set up a CLAS Speakers' Committee that has significant control over choice of conference speakers. The Physics Working Groups also have a significant role. The CLAS Service Work Committee has been formed and is starting to function. Each CLAS group is asked to submit a summary of previous CLAS service work and a plan for the next 2 years by Dec 31, 1998. I discuss these further below. NEXT COLLAB MTG(S): We agreed to the weekend of January 14-16 for the next collab mtg. We tentatively agreed to the first weekend of June (3-5) for the following meeting. That is after the Trieste meeting and before the PANIC conference. As of now, the meeting length will be similar to what I sought for the last 2 - Thur noon to Sat early afternoon. RUN PERIOD REVIEW: The g1 and g6 run periods were reviewed by Rory Miskimen and Girard Audit and by a few plenary speakers. Few results available at this time mostly show the ability to separate various final states in gamma+proton interactions. Final states seen prominently include eta p, eta' p, rho p, omega p, K+ Lambda, K+ Sigma, a hint of phi p and others. Statistics on tape are VERY impressive, about 400 Million events each for polarized and unpolarized beam. Elton Smith reviewed CLAS performance during these runs. To first order, the efficiency was similar to what was seen for e1. Overall data taking efficiency was a little more than 50% with accelarator efficiency about 60-70% and CLAS up time about 85%. It is interesting to note that we have similar up-time fractions as the other halls despite a much more complicated system. Elton also presented a rough analysis of problems that caused downtime by looking at the log book entries. No single problem dominates, but DAQ has the largest number of entries (~20 per month). Various electronic problems show up regularly with 2-10 per month. I feel (and I am sure others agree) that we must keep 'reasonable' track of problems and downtime. DAQ: Dieter Cords presented evidence for a major improvement in DAQ rates. I hesitate to give numbers before they are seen in REAL data situations, but there are good reasons to plan on data rates in the near future that are significantly larger than what was seen in previous runs. PHYSICS ANALYSIS: The e1 groups has carried a few analyses to the threshold of cross sections, specifically pi+, pi0 and eta production. In each case, the first try at acceptance has been run with moderate success. There is clear qualitative agreement with the features of the yields, but quantitative agreement is not possible yet. There are sharp features in the N* decay angular distributions that will be difficult to model. MEMBERSHIP: Derrik Branford (Edinburgh) was approved for full membership. The Membership Commitee strongly recommended approval for membership of John Price (La. Tech), John Hardie (Christopher Newport) , and Michel Guidal (Orsay). These cases will be presented to the collaboration next meeting. SERVICE WORK: There is now a Service Work Committee- Ken Hicks (chair), Hall Crannell, Cole Smith, Dennis Weygand, Mac Mestayer, and Elton Smith are the members. There charge is to carry out the assessment of CLAS service work specified in the by-law passed at the last collab mtg. (See my web page for a link to the text which is on Gail Dodge's web page.) The prime goal here is to recognize there is a lot of work required to produce high quality data. We need to have people not only taking shifts, but also doing maintenance, calibration, repair, documentation, software development.... The committee is requesting a short document specifying the people who will contribute and the tasks the group would like to be responsible for. The committee will help groups choose tasks if desired. SPEAKER COMMITTEE: There is now a CLAS by-law specifying the procedures for choosing speakers from our collaboration to conferences and workshops. The control will be a combination of the new CLAS Speakers Comm (CSC) and the Physics Working Groups (PWG). Check my web page or Barry Ritchie's web page for the text. The biggest change is that the committee is supposed to seek invited talks (e.g suggesting relevant topics) from conference organizers, then choose the speakers. Any invitations for invited talks at conferences or workshops you receive AFTER OCTOBER 3, 1998 must be forwarded to the CSC. Although the CSC has the right to deny the request, I doubt this will happen often. All contributed talks will be coordianted by the PWGs. Also, all RESULTS that go out as associated with the CLAS collaboration must be approved by either the PWG (and the collab.) or a fast track method through the Coordinating Comm. http://agogo.phyast.pitt.edu/~dytman http://groucho.la.asu.edu/~ritchie/csc4.ps has the text that was passed at the Oct 98 mtg. http://physics.odu.edu/~dodge/bylaws_jun98.txt has the by-laws not including the latest changes. PROPOSALS: There were 7 proposals approved by the PWG and the collab. These will be presented at the next PAC as CLAS proposals. I will try to remember the subjects and list the spokesmen I remember. pion polarizability with a new polarized photon source (Hicks, Norum, Wang) pi+ electroproduction from He3 with linearly polarized photons (Norum) proton Compton scattering with linearly polarized photons (Sober) rho photoproduction from He3 to look at medium modifications (Lolos, Cole) polarization observables in lambda electroproduction with polarized electrons (Raue, Carman, Joo) omega photoproduction with linearly pol photons (Klein, Cole) rho pi and K* K photoproduction to look for 'new' particles (Adams, Salgado, Weygand) Thanks for your attention, please send comments and corrections to me.