1. 2005-Apr-04MPI Calorimeter Plans for SLHC1 ATLAS at SLHC Calorimeter R&D at MPI Three possible routes being investigated: Verify feasibility for high intensities with existing LAr detector ensemble at CERN testbeam. (2006?) A small test facility to study breakdown limits and different technology options for very high intensities: Tests at Protvino. ISTC project (2006?) Development of new ‘cold electronics‘ for HEC. Start in 2005? Make choice where to participate and with whom to collaborate.

2. 2005-Apr-04MPI Calorimeter Plans for SLHC2 Tests of high intensity operation already undertaken Extensive Argon Poisoning tests of every calorimeter component, e.g. at the IBR2 reactor in Dubna. Argon Mobility Studies at Tucson to establish the intensity that ion-buildup will become a major issue. High Radiation Studies at BNL to establish that the Argon during a catastrophic LAr release after high intensity running would not cause a health hazard. Relatively low intensity tests of calorimeters in the CERN test beams, along with a short, relatively high intensity HEC and EMB test.

3. 2005-Apr-04MPI Calorimeter Plans for SLHC3 High Intensity Beam Test at CERN A high intensity test with the existing EndCap setup at CERN, in which we would test the electronics operation investigate in detail the signal variation with ion-buildup test HV behaviour with ion-buildup Use the set-up of the 2004 EC2 combined beam test Calorimeter equipment is still in the H6 beamline Upgrade elect ronics Relatively inexpensive Could be combined with a possible new calibration run LoI submitted to ATLAS and the SPS Pushing to breaking point what we have as a test setup for our ATLAS installed calorimeters would be extremely ill-advised !

4. 2005-Apr-04MPI Calorimeter Plans for SLHC4 This ‘Small Test‘ is complimentary to a large scale CERN test! Very High Intensity Test of ATLAS LAr EndCap Calorimeters A very high intensity test with ATLAS like structures in a smaller set-up would allow to: Push aggressively the radiation limit Change the active medium Learn about radioactive handling and storage (>45 mR/hr on contact for FCal) ! Investigate any problems by changing detector components but would rather not: test the electronics operation investigate in detail the signal variation with ion-buildup

5. 2005-Apr-04MPI Calorimeter Plans for SLHC5 Proposal for Small Test Small volume test calorimeter made of ATLAS components … in an intense GeV proton beam near shower maximum: Absorber P + Beam Few GeV nA Intensity Small test cryostat Beam dump

6. 2005-Apr-04MPI Calorimeter Plans for SLHC6 Small Test Proposal Continued Small cryostat would be suitable for any high intensity test: Various active materials (for instance adding impurities to the argon, or even going to a gas!) R&D if a problem with the EndCap Calorimeters was identified Initial test would have a sample of each EndCap detector present In the likely event of a null result at full intensity… we just turn up the intensity and see what breaks first… establishing a real limit for the calorimeter. Small size allows inexpensive repeat tests with same cryostat but new calorimeter parts.

7. 2005-Apr-04MPI Calorimeter Plans for SLHC7 Proposed aspects tested together in an initial test Honeycomb HV spacer Peek HV spacer Argon with 1ppm to 1ppb purity High Voltage Irradiation Kapton Boards Cryostat and detector main surfaces HV and signal cables Ratio of irradiated argon in gaps to total argon volume as in ATLAS.

8. 2005-Apr-04MPI Calorimeter Plans for SLHC8 Tasks for Small Test Verify the ATLAS EC calorimeter system will operate at full LHC intensity. Check no other unforeseen problems arise at high incident flux. If they arise, undertake a detailed analysis to fully understand the problem. (by changing what is in the cryostat) Test a commercial high purity argon purification system in a setup in which the argon is heavily irradiated. Establish the integrated flux limit of operation of the high pseudo-rapidity elements of the endcap calorimeters (EMEC, FCAL and HEC)

9. 2005-Apr-04MPI Calorimeter Plans for SLHC9 Tasks for Small Test (cont.) Repeat measurements of the radioactive contaminants in the liquid argon in this considerably more realistic setup. Make these tests over a more extended time ( giving radio-active impurities longer to stick to the “walls” ). Establish the radiation levels anticipated to be present in the materials of the calorimeter (Copper, Lead, Tungsten, etc), and develop a plan for handling of these materials during repair, upgrade, or decommissioning of the calorimeter. A scenario for final environmentally safe storage of the calorimeters will be developed.

10. 2005-Apr-04MPI Calorimeter Plans for SLHC10 Small Test at IHEP Protvino IHEP accelerator is 70 GeV proton synchrotron Cycle time - 10 s Spill time - 1.8 s Intensity ~ 1  10 13 p/cycle Accelerator more than adequate for nominal LHC intensities (~ 1 min bias / 10 -9 s), and beyond! Build equipment at Molniya using ISTC funds Integrate Russian groups using INTAS funds

11. 2005-Apr-04MPI Calorimeter Plans for SLHC11 Cold Electronics for HEC Start new R&D Program Special responsibility of MPI Strategy: Produce identical PSB boards, but with new chips? Chip technology: GaAs or Si CMOS ? GaAs: 400 nm technology (old technology 1 μ) Si: 130 nm technology (CERN choice, old technology 250 nm) Qualification tests: Radiation Hardness: factor 10 more Power consumption Long term reliability (HV break down!) Operation in LAr (electron mobility, bubbling,...) MPI QC infrastructure being revisited Collaboration Kosice / MPI ?