1. PDT’s  Control Board DSP Software (Sten,HH) u Updated so as to include the wire-length in the module data  Readout u All 6 crates in global run. u 90/94 front-ends are in the global runs including all B&C-layer PDT’s.  Electronics u Replaced a 1553 controller in MCH3  T0’s (DW,MW,DS) u Downloaded to all 94 PDT’s

2. Examine Plots  C-layer shows no missing PDT’s, no hot PDT’s  A-layer shows 4 missing PDT’s, 2 hot PDT’s

3. Examine Plots  B-layer shows no missing PDT’s, 3 hot PDT’s in the bottom B-Layer  I’d like to concentrate on this so as to be ready to trigger on PDT’s.

4. Timing  We have made adjustments to move the hits a little earlier (reducing t0’s).  T0’s are available for All PDT’s u For 67/94 I have measured T0’s from timing distributions. For the others I made an estimate based on the t0’s of similar PDTs. u Three timing sets used so far  We haven’t looked at Pads yet - unpacking problems. Trigger = Minbias*ticksel 0 First crossing after synch gap (d.t.=550 ns) OLD Timing Plots

5. PDT’s  Example of T0’s from run 130080

6. PDT Problem  Mujet triggers provide sample of relatively clean high-pT muons. Sooo… where are the tracks? u I used D0ev to identify the first event (14th in the file) that satisfied the mujet trigger. I used the save event button to extract it. u I used dsdump --raw --byteswap to display the contents of the event (~200000 lines). u I hand-unpacked and hand event-displayed There were nice hits in B & C layer PDT’s that corresponded with the scintillator hits. u Onne Peters ran the muon code and made an event display picture of that event too.

7. Unpack & Event Display

8. Event Display Picture  Then u Onne disabled hit selection and made the event display picture again.

9. First Central Muon Track in Run 2 Pbarp Collisons

10. Another Central Muon

11. Hmm

12. Hmm2

14. Summary/Plans  Central Muon ID suddenly will achieve higher efficiency.  Short Term proposed plan for muons u select and tapout dimuon event-tuples s initially these will be |eta|>~1 s hopefully within a week or so Reco will have a fix for central muons, too. u Use these to study performance and develop W and Z to muon object identification u I believe the events will be primarily b-bbar with non-isolated muons until we use isolation. Probably we should start where we were in Run I: s delta R (mu-jet) > 0.7 for 0.5 cone jets s good idea to check Run I publications s I recall W/Z and top had slightly different criteria

15. Conclusions  We believe PDT’s are operating well.  Starting to put shine on the electronics. u Kill hot cells u fix missing channels.  We’ve got t0’s for all runs taken since April 27th and a set of timing parameters which will set them to an average of 100 ns.  We have identified a change in software which will make it possible to find tracks in the PDT’s.  A quick scan appears to show some electronics has been cables backwards.  Next step: hand scan 500 tracks.

16. Central Muon during October Shutdown  Scintillators u The major task is an SFE cycle to correct a time-of-flight gate mistake.  PDT’s u A-layer access to s Reprogram timing chips on Cobo’s s Replace a couple Cobo’s and FEB’s to suppress hot or missing channels s Rewire FEB Cobo connections in Oct 1. u Broken wires s ~10 PDT’s have had broken wires jumpered out. s Procedure to fix the wire involves pumping and refilling with operating gas. So we ill need a Bob Kubinsky or other expert to assist with that.

17.  PDT’s continued u Survey  The Run II position of some unsurveyed PDT’s is known to no better than 1” from Run I data. Implication is (  p)/p ~ 300% instead of ~20% in those directions. s It’s important to complete the muon survey! Central Muon during October Shutdown