# Presentation: 128879

## Run 2b – next step

*Regina Demina*
*Kansas State University*

- Regina Demina

## Outline

*History *
*Accelerator performance scenarios*
*Chip issues*
*Replacement options*
*Next steps*
*Urgent issues *
*Conclusions*

- Regina Demina

## History of Run 2b

*1997 – TeV33 report (large scope upgrade, pixels)*
*1998 Susy/Higgs workshop – 30fb**-1** per experiment to discover Higgs*
*Fall 1999 – informal discussions of the replacement options – partial+L0*
*01/00 – Run 2b group formed (Rich Partridge+RD)*

- Regina Demina

## History of Run 2b

*03/00 – miniworkshop – D0 needs beyond 2fb**-1** :*
*Need to replace silicon L1 and L2*
*L0 looks attractive*
*SIFT*
*occupancy in inner CFT=> triggering problems *
*Muon occupancy*
*04/00 – report D0 needs to PAC*
*Suggestion from PAC to explore both partial and full replacement options *

- Regina Demina

## Accelerator performance scenario

*Spring 2000 - interactions with AC people, presentation to AAC:*
*Go to 132ns at the end of Run 2a*
*Deliver 2fb**-1** in Run 2a – by the end of 2003 *
*Need ~2months shutdown to install electron cooling in Recycler **(nothing major)*
*Run with crossing angle in Run 2b*
*Deliver 13fb**-1** in Run 2b – by the end of 2006 *
*Party line: 15fb**-1**  in Run 2*
*Need a better detector!*

- Regina Demina

## History of Run 2b

*06/00 – Run 2b plans report to PAC outlining full and partial replacement scenarios*
*We were asked to prepare both minimal and non-minimal options*
*Guidelines from Lab management for minimal:*
*$2.5 M (+foreign contributions, if there are any)*
*NB. This does not include contingency, but includes temp labor*
*6 months shutdown*
*Detector must survive 15fb**-1*

- Regina Demina

## History of Run 2b

*06/00 – De Kalb D0 workshop*
*Identified silicon replacement options:*
*Partial:*
*+strip L0 (RD, Alice Bean)*
*+pixel L0 (Gordon, Ela, Meena) *
*+L5 (Greg, Yuri)*
*Full **(Alice, Cecilia, Jim Fast, Frank F, Sijbrand)*
*Discussed readout chip problem **(more later in the talk)*

- Regina Demina

## Silicon replacement review

*Review panel:*
*Darien Wood (chair), Hal Evans,Jim Fast, Frank Filthaut, Eric Kajfasz, Ron Lipton*
*Worked on a very tight schedule*
*A lot of work was done by the proponents*
*One-day review on 09/20 *
*Made a decision, reported by FF today*
*Partial: L1+L2+L0 (strip, pixel later) with old chips*
*Full – with new chips*

- Regina Demina

## Chip issues

*We have ~1520 SVX2 chips left **(19 wafers banked - with an average yield of 80 chips/wafer)*
*Fibers need  ~200*
***1300 available for partial replacement***
*Technology is obsolete – need to redesign to produce more*
*Old SVX2 chip has limited rad hardness – to ~6MRad*
*Very limited upgrade is possible using the old chips **(L1+L2, maybe+L0)*
*Otherwise need to develop a new chip (L5, full)*

- Regina Demina

## Readout chip options

*SVX4 – joint with CDF*
*Several meetings with CDF people:*
*D0: Marvin, Ron Lipton, Alice Bean, Andrei Nomerotski, RD, RP*
*Need to compromise - not a drop in replacement*
*Hard to accommodate both CDF and D0 needs *
*SVX3 and 2 chips are already very complex*
*Combining makes it even worse *

- Regina Demina

## Readout chip options

*SVX2’ – (SVX2 on 0.25 ****m) *
*Could be simpler to do, but we are on our own*
*LBL is not really interested *
*resources at  Fermilab  - Yarema’s group *
*analogue part only *
*Can start working in 1⁄2 year*
*SVX2’ – (SVX2 on 0.7****m) *
*– **rad hardness?*

- Regina Demina

## Readout chip development

*A very long (1.5-2 years) and painful process*
*Situation may be better now with new design tools, **still  APV 0.8 to 0.25 ****m conversion took >1 year *(RAL/CERN/Imperial College)
*Very limited number of people can do this*
*Clearly a schedule driving component*
*Cannot start building detectors without a chip in hand*

- Regina Demina

## Readout chip options

*APV25 (CMS chip)*
*Exists and looks good*
*Very rad hard*
*Simple chip*
*Initiated contact with Geoff Hall – good deal of interest*
*Phone conference (10/00)*
*Marvin, Ron Lipton, Andrei Nomerotski, Mark Bailey*
*Geoff Hall+*
***A lot of work**** to adapt D0 DAQ to APV25 and CMS philosophy *
*Can start building detector without boards in hand*
*More people can do this work*

- Regina Demina

## Readout chip options

- Need to decide
- by the end of November

- Regina Demina

## Schedule issues

*Chip is driving the schedule*
*Assume 1 year (unrealistic) chip development – full replacement ready by 12/03*
*Chip slips by a year – the final date slips by a year – **you cannot start building a detector without chips in hand*
*An interesting fallback option is using APV25 – decouples DAQ R&D and detector construction - **you can start building a detector without all boards in hand*

- Regina Demina

## Price tags (no contingency)

*L1, L2 (old chips)- $1.1M*
*L1, L2+L0 (strips; old chip)– $1.5M*
*L1, L2+L0 (strips; new chip) – $2.2M*
*L1, L2+L0 (pixels; old chip) – $2.3M*
*L1, L2+L5 new chip – $3.0M*
*Full replacement  - $4.4M*

- These numbers are very preliminary, do not include temps

- Regina Demina

## SiDet resources review (09/00)

*PPD reviewed SiDet resources and found them adequate (J. Cooper)*

- 2

- 4

- 9

- 7

- Regina Demina

## Partial vs Full

*Partial*
*Advantages*
*Lower cost*
*Lower schedule risk*
*Disadvantages*
*Longer shutdown – 8 months*
*Limited lifetime (L3, SVX2)*
*Cooling problems*
*Risk during the replacement*
*Huge spike in manpower during the shutdown*

*Full*
*Advantages*
*Shorter shutdown*
*Simpler design*
*Better pattern recognition*
*Integrated cooling*
*Disadvantages*
*Higher cost*
*Higher schedule risk – chip development *
*More manpower*

- Regina Demina

## Next steps

*10/19 – spokespeople meet with the director to brief him on the Run 2b situation*
*~10/19- post PAC document for collaboration comments*
*11/3-5 - present partial and full replacement options to PAC*

- Regina Demina

## Urgent issues

*Decide on the chip option, start development*
*Start working on the new beam pipe for L0– 18months procurement*
*Silicon sensor R&D – irradiation studies*
*Choose technology, vendors*
*Continue design studies*
*Cooling analysis for partial replacement*

- Regina Demina

## Urgent issues

*Engineering design of full replacement*
*Have submitted a request for R&D funding to PPD*
*Expect $$ any minute now.*

- Regina Demina

## Run 2b

*The scope of Run 2B will ultimately be determined by what D0 is capable of doing in the time available.  *
*As the review panel notes, the present level of effort is insufficient for even the smallest option.*
*We need the commitment of the collaboration to this project --- and this will mean for some people that they have to concentrate on Run 2B rather than doing the physics with Run 2A.  *
*Otherwise it won't happen.*

- Regina Demina

- From EW fits
- M(H)<188 GeV/c2

- Ultimate LEP reach
-  (@ Ecm=206 GeV):
- exclusion - 115 GeV/c2;
- discovery 110 GeV/c2.

***Run 2b is all about  Higgs***

**For us**

- H->bb

- H->WW*

- Regina Demina

## Backup slides

- Regina Demina

## Assumptions

*Silicon sensor cost 700$*
*Chip R&D cost 1080K = **2FTE*2year*150K + 4submitions*30K*
*Chip cost 50$/chip*
*HDI cost 300$- new, 550$ - old*
*rods, cooling, cables = *262.5K *(scaled from CMS)*
*support structure = 625K (CMS inner barrel)*
*beam pipe = 250K*
*Pixel L0 = 900K – scaled from BTeV*
*50% spares on electronics*
*20% spares on silicon *
*50% contingency*

- Regina Demina

## Full replacement

- SMTII ready to roll in on 01/28/04

- Regina Demina