1. HPS: R&D issues Krzysztof Piotrzkowski (UCLouvain/CERN)
Moving pipe
Timing detectors
Manchester meeting, December 2009

2. Moving Hamburg pipe concept
Successfully used at HERA:
Robust and simple design, + easy access to detectors
Motorization and movement control to be cloned from LHC collimator design
14/12/2009
K. Piotrzkowski

3. Status of Hamburg moving beam pipe
Machining
Benoît FLORINS

4. Status of Hamburg moving beam pipe
Electro-erosion

5. Moving pipe: Detector ‘pockets’
In preparation for 2009 (!) beam tests:
Thin 300 mm entrance and side windows
14/12/2009
K. Piotrzkowski

6. Hamburg moving beam pipe prototype
UCLouvain
Two pockets laser welded ready for test beam

7. HPS acceptance: Recent lessons
HPS240 approach not too close to avoid shadowing
Dead edge should be minimized at HPS240
It favors short pockets
For HPS240 one pocket design should become baseline
Length of Cerenkov detectors should be minimized
Present CMS pixel detector provide good resolution for stage 1
14/12/2009
K. Piotrzkowski

8. Moving pipe R&D
We need to start asap moving pipe design effort, coordinated by LHC/CERN groups:
Finalize pocket design
Design all integration aspects (vacuum, RF, etc)
Integrate collimator motorization solutions
Make safety and risk analysis
Prototyping:
+ UCLouvain got funding for making a full moving pipe prototype
with HR: 30% mech. Engineer + CAD office + mechanical workshop
+ UERJ (Rio) might contribute to control software (motors)
14/12/2009
K. Piotrzkowski

9. Picosecond ToF detectors
At nominal luminosity event rate so FP420 that accidental overlays (= interesting event in central detector + two protons from single diffraction) become major background!
Use very fast ToF detectors to reduce it by matching z-vertex from central tracking with z-by-timing from proton arrival time difference:
LHC vertex spread is ~50 mm to reduce significantly backgrounds one needs ~10 ps time resolutions (  2 mm z-vertex resolution)!
Developed very fast timing detectors: Cerenkov radiators + fastest MCP-PMTs
Very challenging environment  pushing MCP-PMT performances to the limits:
High event rates, up to several MHz
Running MCP-PMTs close to maximal anode currents
Large annual total collected anode charges (~10 C/cm2!)
GasToF: Gas (C4F10) Cerenkov detector with very fast light pulse (< 1 ps!)  resolution limited by TTS of MCP-PMTs and electronics
Quartic: Quartz based Cerenkov with fine segmentation – multi-hit capability
Going beyond requires new ideas: sub-picosecond streak cameras??
14/12/2009
K. Piotrzkowski

10. GasToF: Cosmic-ray tests
Resolution < 20 ps for 1 p.e.!
From Dec’08
14/12/2009
K. Piotrzkowski

11. Timing detectors R&D
Detector designs and prototyping well advanced (for stage 1)
MCP-PMT laser testing mature – good contacts with Photek;
plans for lifetime measurements
Need to focus on fast electronics – should be part of pool of CMS upgrade projects:
- reference precision clock long distance distribution
(Jeff/LLNL+SLAC and Mike(and Brian)/FNAL)
- fast CFD and TDC cards (UCLouvain/FNAL/???)
- DAQ for timing (???)
14/12/2009
K. Piotrzkowski

12. Other??
BPM??
Alignment??
14/12/2009
K. Piotrzkowski

13. 3D sensors/detectors 3D R&D network well developed and expanding
Next year (2010) crucial for sensor testing at beams + first sensors with CMS pixel chips
14/12/2009
K. Piotrzkowski