Production and Sti plans ...

Jérôme LAURET

Brookhaven National Laboratory

STAR Analysis Meeting

December 5th 2004

Production history

Year4 production done so far ...

Not too much

We waited (until October 28th 2004, see S&C meeting notes) and ...

Decided to proceed with TPT+EST (ongoing and NOT stopping)

Careful inspection of ITTF / Sti revealed a few fundamental problems not seen prior (MCS treatment, beam pipe material, wrong track length, points outside TPC volume, hits off tracks, missing SSD material, ...)

It was un-safe to proceed with Sti as planned

Interestingly, d+Au evaluation DID NOT show ANY major discrepancies

Still puzzled about that ...

globals vs primaries (??), low density

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

Production direction change

Sti project changed direction ....

Claude's knowledge remains a key to success

Core team (Victor / Yuri) fully allocated to helping with code check (in depth)

Marco volunteered to help with evaluation

Thanks ! Thanks ! Thanks ! Thanks ! Thanks ! Thanks !!
has been a tremendous help along with insightful comments and suggestions and clear understanding of the issue at hand

Manuel, Marcelo, Duncan, ...

Smaller team reviewing from top to bottom

Seem like something we should have started with ...

... but, here we are. Moving on.

High density: Zibi could tell me “I told you so” ...

Made a (few) judgment call mistake ...

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

All and behold ...

With d+Au evaluation, seemed like a long way ahead and boosted our ambitions and hopes ...

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

All and behold ...

With d+Au evaluation, seemed like a long way ahead ... continuing in that direction seemed like ...

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

All and behold ...

With d+Au evaluation, seemed like a long way ahead and boosted our ambitions and hopes ..

The current redirection forcing a top-to-bottom and inside out hand-on code review is what we needed

Maybe after all, we are “lucky” ...

...

This is THE RIGHT approach / the RIGHT Track !!!

In all cases, strategy was to NOT cut bridges with the old code & framework

Allows for production to go ON as we speak !!!

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

Status ...

Sti project status will be given by Claude

Lot's of progress were made, Initial worrisome results ...

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

With SVT

Without SVT

BEFORE

NOW

Remain some issues

Still ... mult differs by ~ 10%

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

Lower upper limit when SVT is in (Duncan)

Do we understand this blob in the

# fit point correlation ??

Sti

TPT

Do we understand residuals ??

SVT residuals ?? A geometry issue ??

Difference between Marcelo and Claude ??

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

Would need more SVT expertise to understand this ...

Waiting for Sti geometry to be checked ...

Where are we now ??

There is still work to be done

Lot's of progress were made, we need to understand and fix the remaining problems

TPC based tracking is believed achievable within weeks

Cannot make much progress without SVT expertise for the SVT part (possible meeting today at noon ?)

Murky issues

Do we have the right hit errors ?? Do we need (re)tuning ??

When a track has 1 SVT hits, do we believe it is the right one ?? Shall we reject it ?? We saw Andrew's results (MC) ... is it reasonable to use such hit within an IT(TF)

Tuning SVT based on what: MC based proved to be from un-satisfactory to leading to false-confidence (Hit errors)

What do we do now ??

What is our criteria for “goodness” ??

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

Where are we going ... targets !!

My current approach to this - Pragmatism -

#1 : Production continues as it stands until in a position to do otherwise

Sti and production schedules no longer tied to one another

#2 : cut suspicious parts, sacrifice speed over clarity

If a formula / approximation is uncertain, replace by proper approach (matrix calculation with matrix package, approximations with Taylor expansion replaced by full formula etc ...) - Speed is secondary

#3 : use what you can when you can

Implement and have in place component rejections: if a ladder does not work, mask it off etc ...

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

Objectives / possible targets

Objectives

Sti IS at the core of our future

Full tracking would have to work ... and be evaluated by March 2nde

Would minimally allow tracker developments for the future

Forward tracking

FTPC-PMD tracking	(Pawan Kumar)

E-EMC / Spin convenient framework

Vertex finding	(Jan Balewsky, Mike Miller?)

E-EMC	(David Relya)

Possible Target / opportunity

Within 2 weeks, can we have Sti working ??

Spin PWG would prefer this to happen (vertex)

TPC or TPC+SVT as it stands by mid-December (15th)

Consistent with pragmatic approach, would need to start anyway

To achieve target, would need

MC?, Au+Au, p+p comparisons

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

Objectives / targets

March 2nd

Would need complete re-evaluation

Au+Au, p+p, MC

Would need to re-assess a few studies

HBT track splitting / merging

Duncan's fluctuation analysis ??

...

So, Sti works (as we hope) and then what ??

Where would we be in the production scheme ??

Could samples be Sti based (like p+p for Spin) ??

A question for PWGC ...

Our SOLE objective is to provide an answer and evaluation by that date

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

But where are we with production ??

Not very far ...

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

Where are we with production ?? (zoom)

In fact, VERY worried about this ...

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

What is causing this low data production rate ??

Where are we with production ??

Resource utilization ~ 50% (should be 85%)

Serious infrastructure issues need attention

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

Network collapse

No disk space for production left

Efficiency drop to 50% net effect ...

AFS problem, job died

Choice and priority ...

Emergency solutions

If need be, CAS nodes can be re-allocated to production

Probably, 20% shift would
not be felt. From 9.44 months
20% -- 7.55
30% -- 6.61
50% -- 4.71

Procurement will not come on time (once again)

1.2 passes do not allow for disaster recovery (already barely suffice to make good Physics)

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

Conclusions

Project had to be stopped due to problems ...

... but Sti is now on the right track

Sti IS our tracker of the future, the question is how far that future is !!??

Opportunity schedule in Spin p+p pass (December 15th)

Pragmatic approach (whatever is ready can be used)

Production as it stands suffers severe problems

Infrastructure issues can no longer wait ... will be addressed ASAP (here also, be prepared for actions you won't like)

All odds anyhow vote for planning and priority

Refer to magic table for trigger-setup, define data-sets

Discuss and establish your Physics objectives and topics NOW !!

Jérôme Lauret – STAR Analysis Meeting – December 5th 2004

Jerome LAURET

2004-12-04T22:44:09