Arnd Meyer (RWTH Aachen) Feb 25, 2004Page 1 Status of Data Taking Arnd Meyer, RWTH Aachen D Ø Collaboration Meeting February 25 th, 2004

Arnd Meyer (RWTH Aachen) Feb 25, 2004 Page 1

Status of Data Taking

Arnd Meyer, RWTH AachenDØ Collaboration Meeting

February 25th, 2004


Run II Status

TevatronPerformance

DØData Taking

~280pb-1

on tapewith

completedetector


Tevatron Performance


0

10

20

30

40

50

60

70

80

10/1/03 12/1/03 1/31/04 4/1/04 6/1/04 8/1/04 10/1/04

Start of Fiscal Year

Pea

k L

umin

osity

(x1

030cm

-2se

c-1

)

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

Tot

al I

nteg

rate

d L

umin

osity

(fb

-1 )

Weekly

Weekly

Phases

Phases

Total

Total

The Plan

≃ 3 months turn-onafter shutdown

pessimistic∫L dt ≃ 233pb-1

design∫L dt ≃ 328pb-1

25% “Recyclerpbar tax” included

Six week shutdown late Summer


Post-Shutdown Startup

● November 17 – 10 week shutdown ends on schedule November 23 – First store after shutdown

December 1-3 – Abort problems - frequent quenches!

● December 5 – 16 house quench Instigated by CDF roman pots Highlighted flaws in abort system

● December 5-14 – Tevatron repairs

Collimators, D49 vacuum, C14 spool piece, B0 low beta quad moves

● December 15 – Tevatron start-up

December 17 – first store

December 20 – record store (4.99 1031cm-2s-1)

● December 20 – 6 house quench

B1 vacuum problems

D49 collimator target


Post-Shutdown Startup cont.

● December 20 – 28 – B1 vacuum repairs● December 22 – 28 – Linac klystron problems● December 28 – Tevatron startup● December 31 – First store after startup● January 10th – Tevatron studies/orbit smoothing● January 11-16th – Recovery from above

Not a single day without deliveredluminosity since January 10th –

this is the longest stretchin Run II so far

60 barn-1/s

0

10

20

30

40

50

60

70

11/23/03 12/21/03 1/18/04 2/15/04 3/14/04

Peak

Lum

inos

ity (

b-1

/sec

)

Meas

Design

Base


FY 04 Integrated Luminosity

2 weeks ahead 1 week shutdown planned for March 15th

of schedule (install debuncher momentum cooling notch filters,CDF wire plane extraction)

0

50

100

150

200

250

300

0 30 60 90 120 150 180 210 240 270 300 330 360

Days Since October 1

Inte

gra

ted L

um

inosity (

pb-1)

FY04

FY03

FY02

FY04 Design

FY04 Base


∫L dt & Store Hours!

Integrated luminosityfollows number of

store hours

Keeping stores longer

Very few “lost” stores

0

2

4

6

8

10

12

14

16

11/20/03 11/30/03 12/10/03 12/20/03 12/30/03 1/9/04 1/19/04 1/29/04 2/8/04 2/18/04 2/28/04

Inte

grat

ed L

umin

osity

per

wee

k (p

b-1

)

0

20

40

60

80

100

120

140

160

Sto

re H

ours

per

Wee

k

Luminosity per Week

Store Hours per Week

0

5

10

15

20

25

30

35

40

8/7/03 8/27/03 9/16/03 10/6/03 10/26/03 11/15/03 12/5/03 12/25/03 1/14/04 2/3/04 2/23/04 3/14/04

Stor

e Ho

urs

15 hrs

30 hrs

140 hrs

85 hrs (plan avg.)


Peak Luminosity & Pbar Efficiency

Pbar efficiency nowregularly >80%

(mid-60's pre-shutdown)

Helps mitigate theimpact of the“Recycler tax”

Unstacked pbars comparableto pre-shutdown – noimprovements (yet) in

stacking rates

80%

65%

160mA

100mA

60

80

100

120

140

160

180

200

8/7/03 8/27/03 9/16/03 10/6/03 10/26/03 11/15/03 12/5/03 12/25/03 1/14/04 2/3/04 2/23/04 3/14/04

Am

ount

uns

tack

ed (m

A)

0

5

10

15

20

25

30

35

40

45

50

55

60

11/20/03 11/30/03 12/10/03 12/20/03 12/30/03 1/9/04 1/19/04 1/29/04 2/8/04 2/18/04 2/28/04

Pea

k Lu

min

osity

(x10

30cm

-2se

c-1

)

40

50

60

70

80

90

100

Pba

r Effi

cien

cy (%

)

Peak Luminosity

Pbar Efficiency


Peak Luminosity Limitation

Peak Luminosity vs.

Unstacked Pbars

Peak Luminosity vs.

Charge at Low Beta

0

10

20

30

40

50

60

70

0 20 40 60 80 100 120 140 160 180 200

Amount Unstacked (x1010)

Pe

ak

Lu

min

os

ity

(x

10

30 c

m-2s

ec-1

)

Peak Luminosity

N

N-1

N-2

N-3

N-4

0

10

20

30

40

50

60

70

0 2 4 6 8 10 12 14

Np x Npbar (x1024)

Pe

ak

Lu

min

os

ity

(x

1030

cm

-2s

ec-1

)

Peak Luminosity

N

N-1

N-2

N-3

N-4

60 barn-1/s

60 barn-1/s


“Recycler” Status

● Making real progress – on track for integration in FY 2005● Pbar lifetime 150 – 800 hours● Transfer efficiency from accumulator to recycler >90%● First store from the Recycler on Jan 23rd – luminosity of 1.2 1031cm-2s-1 from

≃85E10 in the ring. Overall about 30% efficiency – “proof of principle”● Second store from the Recycler last Friday – luminosity of 1.8 1031cm-2s-1 from

about the same amount of pbars

(N.B.:It's still called “Recycler” - but it's “only” planned for pbar cooling)


Long Term Plan

0

1

2

3

4

5

6

7

8

9

10

9/29/03 9/29/04 9/30/05 10/1/06 10/2/07 10/2/08 10/3/09

Start of Fiscal Year

Inte

grat

ed L

umin

osit

y (

fb-1

)

Design Projection

Base Projection

Integrated luminosity at end of each FY Design Base

Fiscal Year (fb -1) (fb -1) FY03 0.33 0.33 FY04 0.64 0.56 FY05 1.2 0.93 FY06 2.7 1.4 FY07 4.4 2.2 FY08 6.4 3.3 FY09 8.5 4.4

≃ no recycler,no e-cooling,no stacktailupgrade

J. Spalding at DOE Review Monday

Design


DØ Data Taking


Week-by-Week StatusLast 2 weeks:90% 88%

10.5 11.2pb-1

9.4 9.8pb-1

137 132 hrs 131 126 hrs

18.1 18.0 106

Keeping offline busy!


Data Taking Efficiency


How's the Competition Doing?


Data Taking Efficiency cont.

● Current upper limit is ≃ 94%

3-6% global front end busy

1% begin and end store transitions

<1% run transitions

● There has been no improvement in the front end busy (5% at 1.3kHz L1A)

Effectively the guideline of <5% FEB is already violated at highest luminosities

Fitting our physics program into the available L1 bandwidth is increasingly difficult

Reducing the FEB (= keeping up with luminosity increases) requires more manpower!!

● Commissioning activities add another 1-3% inefficiency (STT, FPD, ...)● Two major downtimes with a big impact on January and February numbers

SMT power supplies

Taking the “Enhanced Bias” run and hard- and software problems afterwards cost us more than half of the luminosity delivered on the best day at the time

– Bad idea to do this on a Saturday at 2am!

● Recently data taking efficiency has been close to 90%

Tracking crates readoutbalance L1A rate vs. FEB

fairly optimized, continuouseffort to keep this low


SMT & Water

● Effectively knocked out for 2½ days (Jan 29th - 31st)● Beginning on Thursday evening, frequent trips of

the Silicon power supplies on the East side (water drip detection)

Continued to take data without half of the Silicon detectors

● Access next morning – expected one shift to complete work (cathedral)

● Trips were the result of a malfunction of the water drip detection system (loose connections)

● After repairs, one of the power supplies on the West side failed

Discovered a real water leak after opening

Had to collect data in open configuration for one store

● Will improve water drip detection in the Summer shutdown

Connectors not fully seated


Run II Records

Best stores history (peak luminosity)

Store # Begin Lum [cm-2s-1] Duration

2887 Aug 10 16:42 4.55E31 7.4 hrs

3103 Dec 18 15:07 4.84E31 24.9 hrs

3108 Dec 20 4:18 4.99E31 1.9 hrs

3214 Feb 2 11:28 5.25E31 33.7 hrs

3217 Feb 4 4:16 5.27E31 27.8 hrs

3219 Feb 5 15:56 5.60E31 28.4 hrs

3245 Feb 18 22:06 5.95E31 34.9 hrs

Best days history (recorded luminosity)

Day Lum Del [/nb] Lum Rec [/nb]Efficiency Events

May 4th 1877 1685 88.9% 3186k

Jan 1st 2057 1748 85.0% 2931k

Feb 1st 2106 1838 87.3% 3038k

Feb 19th 2301 2102 91.4% 3239k


A “Typical” Store

Initial Lum. 5.9⋅1031cm-2s-1

6-3% L1 Busy

Present max. rate guidelines:Level 1 1.4 kHz FEB < 5% (5-10% headroom to accountLevel 2 800 Hz Muon r/o for rate fluctuations)Level 3 50 Hz Offline (30% room)


More Records

Best weeks history (Mon-Mon recorded luminosity)

Date Delivered Recorded Efficiency In-store Events

May 12th - 18th 8.49pb-1 7.77pb-1 91.5% 98.6 hrs 13.5M

Feb 2nd - 8th 11.39pb-1 8.80pb-1 77.2% 136.2 hrs 16.8M

Feb 9th - 15th 10.51pb-1 9.40pb-1 89.5% 136.9 hrs 18.1M

Feb 16th - 22nd 11.21pb-1 9.81pb-1 87.5% 133.3 hrs 18.0M

Best months history (recorded luminosity)

Date Delivered Recorded Efficiency In-storeEvents

May 2003 25.5pb-1 22.7pb-1 89.0% 327 hrs 42.8M

Jan 2004 33.0pb-1 26.6pb-1 80.5% 467 hrs 55.8M

Feb 2004 36.7pb-1 31.1pb-1 84.7% 448 hrs 58.4M

(... and counting!)


Control Room Shifts

● 24/7 shifters are CAP, DAQ, CALMUO, CFT, SMT, and GM (plus on-call experts)● Suggested shift load is 9 shifts / 6 months / person on the masthead

Average for the first / second half of 2003 was 6.0 / 5.3 shifts

Long shutdown in September to November (many shifts cancelled)

Merged CAL/MUON in June 2003, but added STT (& GM earlier)

IB Meeting will discuss shift requirements

● Managed to fill all shifts with the exception of GM

But at the cost of countless hours spent by detector group leaders

Brazilian groups have agreed to cover all GM day shifts in the future

● Next natural choice for merging is SMT / CFT – will require initiative from (thin) detector groups

Timescale: Summer (needs completed STT commissioning & merging of STT and SMT shifts, consolidated and simplified examines and other procedures, ...)

(N.B.:Need new DAQ shifters – about 10 by the end of the year)

The fact that we are collecting data with high efficiency is to a large partdue to the presence of 5 – 6 well trained people in the control room


Global Monitoring

● Useful tools, but much more potential

● Physics and Trigger Examines provide a limited set of (mostly) “high level” plots

Hard to correlate problems with detector examines

Cannot “drill down” to find the source of a problem

Some problems missed by global distributions

● Need more feedback from offline DQ / analyses!

How is a decision in the control room going to affect an analysis downstream?

● LmTrigger

Non-functional for a month after changes in luminosity format

Elizabeth Gallas & Len Christofek working on improvements (and fixed it)


Not-so-random Detector News


CDF Drift Chamber Aging

● CDF has observed decrease in the central drift chamber amplitudes Attributed to radiation “aging” and reduction in gas amplification Not expected based on “pre Run II tests”

● As CDF is concerned about health of the central drift chamber Turned OFF two inner superlayers of the chamber and reduced gain on next 3

– Total number of superlayers is 8– Major impact on physics– Number of W’s in reco (no optimization) is reduced by ~20%, number of B’s by ~30%

5 days access to remove wireplane for inspection

● Running without Silicon for the last couple of stores (suspect Si cooling)


Detector Aging

● Lessons for us Radiation aging is very dangerous – it can kill your detector forever There are unexpected issues with detectors aging which are very difficult

(impossible?) to test before real data taking We have to constantly monitor for signs of “aging” and act well in advance before

problems become severe

● After 3 years of data taking and ~10% of expected Run II luminosity delivered it is time to evaluate situation with radiation aging

● Dmitri is putting together a brief document outlining radiation aging status and prospect for all D0 sub-detectors

● Major items to cover

What is currently total integrated dose for the “hottest” part of the detector?

What are doses when detector performance expected to start to deteriorate

Do we actually observe any changes in detectors performance – critical!

– For example number of phe per mip in the case of CFT


Detector Aging Summary

(DD, work in progress)

Detector

Expected (measured) dose,

worst location, per fb-1

Dose when signal reduction expected

Systematic monitoring

of aging effects

Radiation aging effects

observed

Comments

Luminosity scintillation counters

~0.3 Mrad ~10% light reduction at 0.5fb-1

Not yet No Annealing, later scintillator replacement

Silicon ~0.2 Mrad Deplition voltage increase at ~0.4Mrad or 2fb -1

Yes Yes, leakage currents increase

No, depletion voltage increase

Many studies been done

Fiber tracker ~15 krad ~15 krad or 1 fb -1 (10% light reduction)

Started No Annealing?

Calorimeter ~1 Mrad >10 Mrad or 10 fb-1 Not yet No LAr

Muon trigger scintillation counters

~0.5 krad ~20 krad or 40 fb -1 (~20% light output reduction)

Yes No

Forward muon tracker

~20 mC/cm >2 C/cm or 100 f b-1 Yes No Gas CF4(90%)+CH4(10%)

Central muon tracker

~3mC/cm ~10% amplitude drop at 0.5 fb-1

Started ? Ar(84%)+CH 4(8%)+CF4(8%)“cleaning” procedure been developed

To be added: preshowers, FPD


Central Fiber Tracker

● Dramatic increase in the number of non operational readout channels observed after the shutdown

≃1.5% of CFT and CPS dead (x20 increase)

Originally believed to be SVX chip /AFE board problem (groups of 64 channels); swapped AFE boards – problems stays

Appeared after last power outage with warm up of cryostat (mid-October)

Possible explanation (water contamination) and fix (dry out) recently verified with test cassette

● Minor impact on offline tracking – but Level 3 tracking and track trigger! 480 CFT axial dead channels

Masked most of the dead channels “On” for track trigger

Modified Level 3 – efficiency unchanged, 20% increase in processing time

● Good news: dead channel count constant, potentially recoverabe


Luminosity & Luminous Region

● New luminosity constant online since January 19th ( Fri) New world average for inelastic cross section is used (60.7 ± 2.4 mb)

Better estimate of acceptance and efficiency

Luminosity-dependent halo corrections

Uncertainty reduced to 6.5%

Juan Estrada

● D0 luminosity continues to be lower than CDF's number (by 4-11%)

● Effort to understand (and optimize) beam optics in the interaction region

Beam width at D0 not optimized

● A 10% increase in luminosity corresponds to about a month of running per year

● Mike Martens is our contact person in Accelerator Division


Other News

● See plenary and parallel sessions for detector status reports

I left out all the good news!

● We are regularly inserting all 18 Roman Pots since January ( Fri)

● We got some good press on new liquid Nitrogen recovery system in Fermilab Today – saving $3500 / month after payback for equipment cost

● MDT leak fixes and gas analyzer system improvement saves another $10000/year


Conclusions

● Accelerators perform better than ever before

The 8 best stores ever occurred in February

Very reliable – none of them terminated early

On track for 0.5fb-1 before the end of the year● Detector is running well

Reasonable start-up after the long shutdown

Accumulating more and better data then ever before with 80-93% daily efficiency

● Feedback from offline data quality efforts into the control room needs to be improved

● All detectors groups need additional manpower!

Level 1 Front-End Busy is beginning to hurt the physics program

Unknown what causes SMT HDI's to fail

Calorimeter data quality (checker board etc.)

Number of CFT dead channels could have been 20% instead of 1.5%

PDT aging

Documents

Arnd Meyer (RWTH Aachen) Feb 25, 2004Page 1 Status of Data Taking Arnd Meyer, RWTH Aachen D Ø Collaboration Meeting February 25 th, 2004