US CMS Silicon Tracker Project Regina Demina KSU

US CMS Silicon Tracker Project Regina Demina KSU Florida State University May 11, 2002

A bit of history u End of 1999 – CDF and DØ silicon u December 1999 – CMS made a decision detectors (~10 m 2 of silicon, ~2 M to go with all silicon tracker = channels) out of Si. Det to be installed u 68 m 2(inner barrel and disks) + in collision halls 164 m 2(outer barrel and disks) = 232 m 2 u 5. 1 M + 5. 6 M = 10. 7 M channels A natural decision for US institutions to join the silicon effort. CDF SVX installation

Si Tracker Group èFermilab u B. Flaugher, R. Lipton, P. Rapidis, L. Spiegel, S. Tkaczyk èKansas State University u T. Bolton, R. Demina, W. Kahl, S. Korjenevski, u W. Reay, R. Sidwell, N. Stanton Two new groups èNorthwestern University Will provide u D. Buchholz èTexas Tech University important u A. Sill support for the èUniversity of California, Riverside UCSB production u Gail Hanson line èUniversity of California, Santa Barbara u C. Campagnari, D. Hale, J. Incandela èUniversity of Illinois, Chicago u L. Chabalina, C. Gerber èUniversity of Kansas u P. Baringer, A. Bean, L. Christofek, X. Zhao èUniversity of Rochester u R. Eusebi, E. Halkiadakis, A. Hocker, P. Tipton

Silicon tracker in Spring 2000 u Single sided, low resistivity silicon sensors as a baseline technology u u q extensively tested by RD 20 – rad hard to >10 Mrad q Several vendor qualified (6” production lines) Working front end chip – APV 25, some issues to be resolved with multiplexer chip – MUX PLL Hybrids – two technologies considered Mechanics in excellent state – a lot inherited from MSGC’s Plan to start production in fall 2001

Outer Barrel Space Frame Spring 2000

Outer Barrel Rods Spring 2000 Silicon modules

Automated assembly 3 TOB modules/ 30 min Gantry at CERN Spring 2000

Si. Trkr Organization

Schedule Issues Schedule slipped by ~ a year q. Hybrid schedule is a concern èDecision on technology was made in September 2000 prototyping was semisuccessful might change the technology q. FEDs èInitial models for testing of large quantities of FE hybrids and modules expected to be ready in late 2002 èOptical models for rod testing will be available 6/03 q. Optical hybrids for assembly of modules into Rods will be available in late 2002 Other critical items are performing better q. Gantries q. PC based test stands q. Probe stations q. Sensors

FE Hybrid status • Industrial hybrid (V 0 – unpackaged chips on ceramics) production started with 1 st Producer. 160 Hybrids delivered (yield 65%) They also say that “the feature size” of hybrid is too small for mass production. • The 2 nd producer has still problems with shorts. • Design of the V 1 version of the hybrid (packaged chips on ceramic- easier to produce) done. Send order to 1 st producer. • 40 substrates hybrids V 2 (packaged chips on FR 4) received, some 10 populated. Hybrids and substrates distributed for mechanical and electrical tests. They look ok. Likely change in technology choice.

HIP and pinhole effects on APV 25 u Highly Ionizing Particles q produced in nuclear interactions, a rare phenomenon) q can saturate entire APV for ~200 ns q Results in inefficiency of ~1. 3% u Pinholes q Leakage current directly into APV 25 q Typically disconnected from readout q Signal inefficiency of >=2 connected pinholes/APV q Rate of new pinhole development <10/(few 100 wafers=1000 APV’s) u Fixes q Change resistor value on hybrid (100 W 50 W) q APV inverter off – reduces dynamic range PSI test beam planned at the end of May to further study the effect US to provide modules

TOB Module 2 sensors bonded together PA hybrid (4 APV 25 chips) ~20 cm Build 6, 000 TOB modules Current plan 2/3: 1/3 at FNAL: UCSB

CMS module production u u Sensors probed at K-State Automated module assembly system – Gantry - is fully commissioned at Fermilab Placement accuracy <5 um 4 (+3) fully functional modules were delivered to CERN for test beam studies at PSI.

Module Testing at FNAL ARCS CMS DAQ Two test systems are now in operation at Si. Det

CM S Tr ac ke r From R&D to Production production R&D