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ECal R&D in N. America -Test Beam Readiness/Plans

· Silicon-tungsten
SLAC, Oregon, Brookhaven (SOB)

· Scintillator tiles ­ tungsten U. Colorado, Fermilab · Hybrid silicon/scintillator ­ tungsten
U. Kansas

Durham TB

R. Frey

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Si-W Concept ­ SiD version

30 or fewer long. samples

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Features Compact (1 mm gaps) High segmentation with little penalty Passive cooling Full dynamic range charge and good (few ns) timing measurements

Si/W (SOB), contd

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Technologies to be tested Dynamically switched Cf Bump bonding and on-Silicon metallizations System-level readout 3 resolutions


Si/W Test Beam Goals
· The ECal test beam priorities are somewhat different from the HCal A full optimization of a HCal design will likely require a hadron shower model which agrees with the test beam data. Much of the ECal design derives from optimization of EM showers in a jet environment. Expect ­ at least for front half of ECal ­ to be able to optimize the design independent of test beam. First goal for test beam: Test the new technologies. Integrated electronics and bump bonding (heat, noise, etc). This does not require a full-depth module. This does not require a full suite of hadron beams. Next goal: A full-depth module. (How wide?) Study full development of hadron showers (global Cal. priority). Optimize back "half" ECal parameters

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Si/W Status and Plans
· Note that current design is optimized for warm, but could be optimized for cold Would require digital pipeline this is current focus Would timing still be desirable? This year Qualify prototype detectors already in hand Fabricate initial RO chip for technical prototype studies
· Readout limited fraction of a wafer ($) (64 of 1024 chns.) · Chips probably not in hand before Jan 2005

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2005 Electronics evaluations Bump bonding "Technical" test beam, summer 2005 at earliest
· A few layers with 1st round detectors and chips

Plan for a full ECal module (similar to eventual ECal)
· Finalize thermal plans, mechanics · Provide correct front radiator for hadron shower validation in test beam. · Earliest beam test: Summer 2006

Continue to evaluate configuration options
· Layering, segmentation
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Tile ECal ­ U. Colorado, FNAL
The Basic Geometrical Structure

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Tile ECal (contd.)
· (from Uriel Nauenberg) Will be ready for test beam in 2006 if funding becomes available in 2005 to build a module. The big issue is electronics; we have very little help with that. The module will consist of 60 layers or 45 layers For 11%/root(E) resolution we need 60 layers of 1/2 X0 Tungsten and 2 mm of scintillator, not 45. For 13%/root(E) then we can go with 45 layers of 3/4 Xo and 3 mm scintillator; (Investigating the spatial resol. deterioration.)

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ECAL R&D; Tungsten ECAL with both Si and Scintillator sampling
Graham W. Wilson for Kansas, Kansas State Universities
· · Concept: physics requires high granularity, reasonable sampling frequency, large BR2, compact RM. => ECAL probably should be W absorber, some Si, some cheaper sampling medium (Scint.). All Si is probably best IF it can be costeffective, IF timing is not important (less so now!), and IF really large R is not dictated by the physics. All Scintillator is probably prohibitively expensive due to channel count at sufficient granularity Ongoing R&D: mostly simulation based on different design possibilities
­ ­ ­ EM energy and angular response studied Photon/hadron separation in progress Critical items
· · Does coarse scintilllator granularity work for a hybrid ? Gap size (compactness)

Test-beam Wishes & Goals:
­ could validate the EM response of hybrid ECALs with mixed sampling media
· Eg. Anti-correlation predicted in Si and Scint. response

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In collaboration with existing groups encourage that data taking opportunities with large volume HCALs and expensive Si-W ECALS can also be used to explore alternative ECAL designs to Si-W
· · Ideally gaps eg. alveoli in the CALICE ECAL could be used to study alternative sampling layers. A hanging-file type approach would facilitate understanding the intrinsic response (but not an engineered hermetic solution ...)

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Have funds available which can contribute significantly to a prototype ECAL construction and testing on a 2-year timescale.
· · Envisage wanting electron, pion beams in summer 2006 Concurrent running with HCAL activities

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Exactly how to proceed depends on developing collaborations and results of simulation studies (want to use test-beam time 8 and construction funds wisely)