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