DD PDT’s
Control Board DSP Software (Sten,HH) Updated so as to include the wire-length in
the module data
Readout All 6 crates in global run. 90/94 front-ends are in the global runs
including all B&C-layer PDT’s.
Electronics Replaced a 1553 controller in MCH3
T0’s (DW,MW,DS) Downloaded to all 94 PDT’s
DD Examine Plots
C-layer shows no missing PDT’s, no hot PDT’s A-layer shows 4 missing PDT’s, 2 hot PDT’s
DD 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.
DD Timing
We have made adjustments to move the hits a little earlier (reducing t0’s).
T0’s are available for All PDT’s 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.
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
DD PDT’s
Example of T0’s from run 130080
DD PDT Problem
Mujet triggers provide sample of relatively clean high-pT muons. Sooo… where are the tracks? 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.
I used dsdump --raw --byteswap to display the contents of the event (~200000 lines).
I hand-unpacked and hand event-displayed There were nice hits in B & C layer PDT’s that corresponded with the scintillator hits.
Onne Peters ran the muon code and made an event display picture of that event too.
DD Unpack & Event Display
DD Event Display Picture
Then Onne disabled hit selection and made the
event display picture again.
DD First Central Muon Track in Run 2 Pbarp Collisons
DD Another Central Muon
DD Hmm
DD Hmm2
DD
DD Summary/Plans
Central Muon ID suddenly will achieve higher efficiency.
Short Term proposed plan for muons select and tapout dimuon event-tuples
initially these will be |eta|>~1 hopefully within a week or so Reco will have a
fix for central muons, too.
Use these to study performance and develop W and Z to muon object identification
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:
delta R (mu-jet) > 0.7 for 0.5 cone jets good idea to check Run I publications I recall W/Z and top had slightly different
criteria
DD Conclusions
We believe PDT’s are operating well. Starting to put shine on the electronics.
Kill hot cells 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.
DD Central Muon during October Shutdown
Scintillators The major task is an SFE cycle to correct a
time-of-flight gate mistake.
PDT’s A-layer access to
Reprogram timing chips on Cobo’s Replace a couple Cobo’s and FEB’s to suppress
hot or missing channels Rewire FEB<-->Cobo connections in Oct 1.
Broken wires ~10 PDT’s have had broken wires jumpered
out. 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.
DD PDT’s continued
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.
It’s important to complete the muon survey!
Central Muon during October Shutdown
DD Central Muon during October Shutdown
SURVEY WORK REQUESTS FOR D0 Aug 24, 2001
RPS/ASI
Request#
Task Description (Technology) EstimatedCrew Days
Detector Configuration: CF Closed, EF’s Closed
Realign Entire Detector (if beam position studiesmake such desirable or mandatory)
(Optical)
1—2
3926 Stick Mike measurements of CF relative to thecenter beam and EF relative to sidewalk
monuments and EMC. This should be donebefore taking data.
1 day
Detector Configuration: EC’s Closed, EF’s Open, Scaffolding
3925 Post-installation survey of 4 N & S EF top C-layerPDT’s (VSTAR).
(Constrain by e.g. B-layer tops)
2 days per side
3924 N&S A-layer Pixels – 8 octants per layer per end(Optical)
2 days
Detector Configuration: E or W CF Closed, EF Open
3923B-layer PDT’s below CB ---phase 2
CF Closed on side measurements are done.(Optical)
1 day per side
3798CF Bottom E&W PDT’s (8 units, TB’s to floor
Holes) CF Closed on side measurements are done-- Phase 3
(Optical)
3 days per side
Detector Configuration: Immaterial
3922Check Survey of Downstream Tops of EMC N &
S Trusses. Stick mike measurement of surveyblocks on the back of the truss relative to
monuments in the wall.
4 hours per side