Attendees: Igor Rachek, Eugene Chudakov, Gordon Cates, Bodo Reitz, Bob Michaels, Doug Higinbotham, John LeRose, Albert Shahinyan, Jonathan Miller, Brad Sawatzky, Bogdan Wojtsekhowski, Hakob Voskanyan, Brandon Craver, Ameya Kolarkar, Sharon Beck, Rob Feuerbach, Arie Beck. Igor presents status of electron arm: - Low power distribution should be completed 2 of 3 chambers have buses installed - Amplifier cards Currently equipping chambers with Nanometric cards The first chamber is fully equipped. The second chamber cards are fully tested and installation is almost complete. There are not currently enough cards to install the third chamber. We expect them to arrive near the end of October. - Low power cables The installation of the terms on the electronics rack and the detector is almost complete. The power supplies may still have problems though. The fuses which are currently installed are not reliable and should be removed. Shower/Pre-shower/Scintillators - All power lines are connected. There remain a few issues on the front end. The power supplies are oscillating. Arie is working on the showers/pre-showers DAQ - Igor observes some strange spectra in the ADC spectra which are not repeatable. - Brandon shows the results of an efficiency study completed on the first chamber in September as well as the results of a spatial resolution study as a function of high voltage also using the first chamber. There is a discussion of the fastbus crate which appears to be causing noise via broadcasting. Doug mentions the issue of ground loops in the hall encountered by SRC. Bogdan reviews the design of the power supply system for the new A/D cards for the front wire chamber. Neutron Arm - Eugene discusses his plan to tune the high voltages. He is still developing a bit of the software. - Hakob is working to complete the Glasgoqw detectors which will be installed in the hall. - Bogdan suggests constructing a 6 meter long, 1 inch wide counter to stretch the height of the neutron detector in order to calibrate its angular position in the hall. - Bodo discusses the status of the neutron arm DAQ The fastbus crate is fully cabled and working. Eugene is currently working with it. The problem with the F1 TDC's has been resolved; they appear to be working with a pulser and may be reconnected. He plans to begin working with the trigger supervisor in order to read out both the fastbus ADCs and the TDCs simultaneously. He requests some cabling from Albert for this job. - Brad discusses the status of the electron arm DAQ All ROCs are being read out and he is currently developing software. Bogdan mentions the issue of scalars. There is currently no design. Bob offers to help with this. Gordon raises the question of deconvoluting the raster. Bogdan believes it is critical. There is a discussion of reading out the BPM's. Data Brad has made the standard GUI's to display raw data. Bryan Moffitt has developed one that is truly online and uses the ET system. Bob discusses various methods to handle synchronization. John, Rick, Arie, Sharon, and Ameya have looked at data from the N-20 run. Sharon has calculated the time resolutions of each bar. Two separate methods for the calculation give results which differ by roughly a factor of 2. This is still being investigated. The resolutions per bar are 180 - 190 ps by one method and 300 - 400 ps by the other method. Arie is working with Brad on the shower class. Rob plans to help Eugene. Ameya is writing scripts which take pedestal data and write to a database. Bob mentions that the helicity information will be delayed due to G0 running in Hall C. This will be a major complication and will require online verification that it is still working. Running the HAPPEX DAQ will report helicity problems. It is necessary to confirm whether Hall C will control the feedback. Rick plans to help analyze the N-20 data. He may help with the scalars as well. John, who is visiting from Maryland is dealing with the pedestals for BigBite. He is also building a database and learning to use ROOT. Brandon discusses his progress with software. Ameya discusses his progress with N-20. Brad requests a master copy of all cabling maps. Target Gordon - Quick Summary: 1. Todd now has 2 full spec cells, and another over-pressured cell. UVa also has an over-pressured cell. Both Todd and UVa have one more cell each coming up soon. So total 7 cells fully in spec + 2 over-pressured. All hybrid, and mixed pumping chamber sizes. 2. To pause making more cells for now and work on evaluating these cells. Focus on what works best. 3. Gordon to take the DuoFAP laser to UVa soon. Ameya testing it now at JLab. Alan: 1. New oven is in. EPR window enlargement was requested by the Kentucky group, so that one part sent back for modification. To get the EPR mount soon. 2. Need more distance between mirror and oven? Discussion. 3. Order another support tube assembly with all the mounts. 4. Shows picture of Optics box. Final. Next, to include compass platform. 5. Shows beamline picture. Bogdan - "Tungsten collimators very useful on neutron side." Support for the collimators? Wood not allowed - fire hazard. Weight issues also considered. 6. Priorities for Alan - After Optics box (next week), work on the magnetic compass design (begin before end of next week), and then go to beamline structure (helium bag, etc.) Gordon talks about Walker paper (80% polarization with 1:1 ratio of K:Rb). Most likely, no water cell will be required (since there is no plan currently to do any water-calibration). Gordon working on the target ladder software. Pam working on the driver. Talk to Alan about what limits to expect. Contact companies?