# Presentation: 183524

## Pixel Upgrades

- U.S. Pixel Meeting
- July 2003

## Possible Upgrade Phases

- Now
- Near term – complete the staged detector
- 0 to 2 years from turn-on
- Medium term – partial(B-layer) or complete replacement that fits within existing Pixel Support Tube(no change in SCT)
- 3 to 5 years from turn-on
- Long term – completely new tracking detector for SLHC
- 8 to 10 years from turn-on

## Now

- Significant cost increases foreseen in (mostly) services related items.
- Going to 2-hit system saves considerable $
- Ask for upgrade funds in FY04 to procure and build services for 3-hit system
- Force the issue now with our collaborators

## Near Term

- Is it feasible to complete the 3rd hit in time for installation along with the baseline detector?
- In my opinion, not unless the LHC schedule slips by > 6 months
- Or if a decision is made not to install the pixel detector for 1st beam(ala CMS) and wait for the first physics run.
- Collaboration decision time is likely mid-to-end of 2004. Not compatible with our production schedule.
- Is it feasible to remove pixel detector, take it apart, install 3rd hit and replace by 2009?
- The time to do this has been estimated to be about 6 months.
- The decision time for this is also mid-to-end of 2004.
- I don’t have much enthusiasm for this option.
- I believe strongly that we should complete the 3-hit system, continuing the production. Practically this means modest U.S. upgrade funding towards the end of FY05 and into FY06.
- A minor point is that should buy ICs for 3-hit system in FY04. This means keeping the yield assumption low.

## Medium Term(1)

|  | B-layer only | New detector |
| --- | --- | --- |
| Ready for install | 0 | 0 |
| Pull out old detector | -0.5 | -0.1 |
| Start full production | -1.5 | -3.0 |
| Start preproduction | -1.0 | -1.5 |
| R&D | -2.0 | -2.0 |
| TOTAL | -5.0 | -6.6 |

| End Date | B-layer start R&D | All start R&D |
| --- | --- | --- |
| 2010 | 2005 | 2003+ |
| 2011 | 2006 | 2004+ |
| 2012 | 2007 | 2005+ |

## Medium Term(2)

- Practically it will be very difficult to start a major R&D effort until the current detector is installed ie until 2006
- Assume luminosity/radiation about same as current specs but with a look forward to SLHC.
- Nevertheless could start in FY04 to address items that would be common to either a B-layer or complete upgrade, and that look forward to SLHC
- Electronics
- Smaller pixels
- Migration from 0.25 to 0.13
- Sensors
- RD50 or equivalent to improve radiation hardness, point way to other than silicon?
- For a complete upgrade, also on the list
- Systems issues in mechanics and cooling(reduce complexity, mass)
- Cabling(serial power)
- Improved data transmission
- Better interconnect(bump bonding, flex/MCM-D) would be nice but not essential – same scale of detector as we have now, except to look forward to SLHC.

- Tool availability issue?

## Long Term

- Everything is on the table as in the medium term plus...
- Continue to follow electronics migration...
- Add L1 triggering to electronics?
- Scale limitations for pixels arise from bump bonding. We hope to ramp up to level of about 1m2/year by the end of current production. If the scale of an SLHC pixel detector is order 5-10m2, then must improve module production rate by factor 2-4. This will not be easy with current bump bonding methods.
- Even 5-10m2 only gets out to R of 20-30 cm.

## Organization

- Near term – same organizational structure, just continuation of production
- Medium term and long term
- Modest component-level R&D in starting FY04. I would place emphasis on electronics and detectors. In FY04 I would leave organizational structure alone and add the R&D.
- In parallel in FY04, need simulation and scoping exercises. How big a “traditional” pixel system is likely? Are there realistic competitors to hybrid pixels? How do pixels, long pixels/short strips, strips fit together into a tracker? I think this is more of a workshop exercise with some coordination, not focused, production-like management. Nevertheless needs to be driven or nothing will happen.