Private:Hall D Staff Meeting, December 21, 2009 Present: George Biallas, Dan Carman, Eugene Chudakov (chair), John Domingo, Casey Heck, Chuck Hutton, Mark Ito, Sascha Somov, Tim whitlatch, Elliott Wolin Dan * FDC full-scale prototype moved from clean room to EEL 126 for testing * on Fri. flow rate was 50 cc/layer/min or 150 cc/min total * there are still known leaks, now flowing at 200 cc/min, about half of what goes in comes out * thinking about a oxygen monitoring * next: finish leak checking, hv checks, fire up testing plan * will test with source and scintillator which can be moved around, some cosmics as well (fixture rotates to allow horizontal and vertical orientation of planes * Here is a [18]picture * 48 anodes and 48 cathodes will be read out (roughly) * at FDC meeting on thursday a game plan for testing was discussed * Kim Shinault is looking at the board redesign, making a time estimate * Bill Crahen submitted g10 pieces (for new design) to shop, full-scale size * Indiana people being contacted about doing photon conversion studies Tim * working on hiring an engineer, a designer, and a technician * engineers and techs should start coming through in January * grounding in hall: grounding grid ties into accelerator grounding, there are exothermic welds of grounding poles that bring the ground up to floor level, some welds did not look good, contractor will put in extra rods, some the "bad" welds under concrete already, but they were tested mechanically and electrically Mark * revised dependency generation scheme for source code builds * instituted checking of environment for builds * wrote very quick start guide, simple steps to do a build * instituted separate directory for detector geometry information (HDDS) * subversion (source code control system) server was upgraded from version 1.1 to version 1.4 George Coil 1 * Covered the coil with the cake pan to do our pressure test. * Leveled the coil and set it in the right location. * We determined that the coil is radially centered within 6.7 mm. * Reconfiguration of the nitrogen tubing (intermediate shield) through the Chimney pass-through hole is in process. * Pressure test write up done Friday & signed by Steve Lassiter. * Bill Crahen's Finite element analysis of the joints between shells and flat end heads shows that the vessel holds together at 120 psi (4 times operating) * Found that as-built construction has beyond yield stress (from bending) at maximum operating pressure. Decided to make the Vacuum Vessel the pressure boundary like at SNS as suggested in the recent review. * Still need more relief ability to keep the Vacuum vessel below 15 psi at the most severe failure scenario. This is found in existing 5 inch pipe not large enough for exhaust above 20 K. Found that 4 ea. existing 6 inch ports can be made with break away. * We still need modifications to the pressure test port plate to do the LN2 test. Coil 3 * Statement of work for substituting the new shield is still is taken by Chuck. * He is still working on are getting the rails, rail feet, bolts and keys and Yoke feet, Coil lifting fixture from IUCF Coil 2 * turn support problem: no progress Test * Stand for the G-0 platform coming in January. * The new vapor cooled current leads in manufacture. * Cryo Can vendor pick was not in DOE's hands. It was in Jlab Finance. It is now going to DOE. * We are continuing working on the small modifications to the Cryo Can: 1. weld configurations to the Hall C standard 2. shift in the feet 3. use of dog clamp flange to capture the bellows from the chimney 4. Add an additional tube to convey the coil pressure at the bottom of the coil to the pilot operated relief valve 5. Substitution of the Hall A re-design of the Valve positioners 6. Add a straw to equilibrate a second volume of helium in the Cryo box. We will introduce these with the negotiations to speed up the contract. * We still need to define the wire harnesses and plugs to be preplaced into the insulating volume. * Chuck Hutton's overall assembly drawing for the test is on the back burner now. * Wayne Sachleben completed the drawings for most of the incidentals like Platform structural enhancement, can cleats, foot plates and interface plates on the personnel stands, incidental personnel scaffolding. They are going to checking. * We added shims to the cryo can feet/cleat interface. The coil lead splice detail in the chimney, ladder modifications and the Anaconda and other u-tube supports still need work. * Josh Ballard continues work on the relief systems for both helium and insulating vacuum. * Scott Spiegel continues work on the spreadsheet based wiring and harness list. Controls schematic drawings at the 75% level are in Slava's hands. Sascha * summarizing background to Primkoff eta for PAC in January * estimating background for reduced magnetic field in solenoid * finishing tagger magnet simulation, vertical resolution issue * will write note on usage of microstrip detectors and specification of magnet for pair spectrometer * MOU's with NCA&T and UNCW progressing Casey * working on FDC, leak checking the prototype in the test stand * after that hooking up connections Chuck * checking BCAL wedge modification * doing some work for George and Floyd Martin * consulting with Slava Razmyslovich on Slava's solenoid control drawings * finishing fine mesh PMT layout scheme for BCAL * working with George on contract with IUCF for transportation of equipment needed for solenoid test Elliott * online meeting on January 6: Ben Raydo on Hall D discriminators and David Lawrence on rootspy * coil test: PNI diagram being worked on, Mark Wissmann is starting design, still missing power control narrative * Armen Stepanyan will start setting up the electronics after the break. * controls drawings being done by Scot Spiegel, he and Chuck will check them * alarms from PLC's to pager system: info pathway understood * we will have a new lab pager system in January * how to wire the dump resistor: Mark Stevens looking at this. + Tim: last Friday there was a meeting. Scot, Mark, Paul Brindza, and Tim attended. Paul thought current location was OK. It will probably stay where it is. * Everything ordered for solenoid test control electronics, save a few items * input was given to Chuck for schedule in fastrack * Tom Carstens wants computer to sit in SRF control room * the doors in F117 seem to be coming Eugene * jobs: + two offers accepted, Pentchev starts beginning of January, Yi beginning of February + still negotiating 3rd position + new position for chamber construction will likely be created, temporary position, scientist, there is a candidate under consideration * Eugene wished all of us Happy Holidays and reminded us to stay safe during the upcoming winter break. Similar wishes were passed around by the assembled. Retrieved from "http://www.jlab.org/Hall-D/software/wiki/index.php/Private:Hall_D_Staff_Meeting%2C_December_21%2C_2009" References 18. http://www.jlab.org/Hall-D/detector/fdc/photographs/3layer2.jpg