E cm up to 1 TeV, de- pending on site chosen Design luminosity of 2x10 34 cm -2 s -1 Beam spot: 550x5.7 nm Crossings every 337 ns for about 1  s; repeats at 5 Hz TESLA NLC

Linear Collider Detectors (approximate) “L” Design: Gaseous Tracking (TPC) R max ~ 170cm 4 Tesla Field Precise (Si/W) EM Calorimeter “S” Design: Solid-State Tracking R max = 125cm 5 Tesla Field Precise (Si/W) Calorimeter

The SD-MAR01 Tracker B=4T B=5T The Trackers Gaseous (LD, LDC, …) Solid-State (SD, SiD, …)

… and Their Performance Error in radius of curvature  is propor- tional to error in 1/p , or  p  /p  2. Code: This is very rough; details and updates in a moment!

Linear Collider Physics… At leading order, the LC is a machine geared toward the elucidation of Electroweak symmetry breaking. Need to concentrate on: Precision Higgs Physics Strong WW Scattering SUSY

Reconstructing Higgsstrahlung ++ -- Haijun Yang, Michigan M  for  p  / p  2 = 2x10 -5

Potential Advantages of the Gossamer Tracker Such a tracker may prove mechanically simpler, and offers the greatest possibility of competing with gaseous tracking at low p . Substantial work needed in fleshing out design; we will expand our discus- sion at SCIPP soon; can use much help!

FPGA-based control and data- acquisition system INITIAL RESULTS LSTFE-2 chip mounted on readout board

CDF L00 Sensor “Snake” CDF L00 “Snake” LSTFE1 chip on Readout Board

Readout Noise Results Relative to prior results, have explored “center- tapping” (reading out from center of chain rather than end. Naïve expectation Expectation with measured shape factors F i, F v Measured (end readout) Measured (center-tap)

11 Damage coefficients less for p-type for E e- < ~1GeV (two groups); note critical energy in W is ~10 MeV But: Are electrons the entire picture? NIELe - Energy 2x MeV 5x MeV 1x MeV 2x MeV G.P. Summers et al., IEEE Trans Nucl Sci 40, 1372 (1993)

Proposal: JLAB Hall B Beam Dump (Plan to run 0.05  A through next May)  Total power in beam ~250W.