No abstract available

[en] The SLAC Mark II detector is being improved by the addition of a new main drift chamber and associated electronics to prepare it for operations as the first detector at SLC. Presented here are the initial signal processing electronics, the preamplifiers, amplifiers and discriminators for the 5832 sense wires, which are located on the detector itself. The performance of the detector is established almost entirely by the drift chamber and these electronics

[en] The authors report the study of radiation induced change in the current gain of bipolar transistors for three different gamma dose rates. The dose rates differed by a factor of 60 with the lowest close to that anticipated for the LHC, and the highest at a rate they have been routinely using for radiation damage tests. The maximum dose attained was 200kRad, which is high enough to compare with other measurements. The importance of annealing high dose rate data is demonstrated

[en] We quantify the design parameters for a central tracking system capable of good momentum measurements and high reconstruction efficiency for charged particles within 1 TeV jets. We express our results as a set of scaling rules. Based on these rules we outline a silicon strip tracking system which is well matched to the SSC high luminosity environment. Special challenges for the construction of this tracker are in the area of electronics readout. We present initial work we have done in this area. 11 refs., 16 figs., 1 tab

[en] Work for the coming year is a logical continuation of the efforts of the past year. Some special highlights of this past year which are discusses in more detail in this report are: (1) The move onto beamline and start of ZEUS data taking. (2) The completion of the SDC technical proposal including a detailed long-term plan for construction. (3) Continuing publication of very detailed physics results from ALEPH concerning τ and b physics, and a precision measurement of electroweak and QCD parameters. (4) Completion of very successful data taking for E-791 at Fermilab, with nearly twice as many events recorded as initially proposed. (5) First measurement of beam polarization at the SLC. These efforts have led to about 15 physics publications this past year centered mainly on topics related to QCD, couplings of flavors to the Z degrees, and heavy flavor decays. Taken as a whole, the results in jets from LEP, the ratio of hadronic to leptonic decays of the τ the leptonic branching fraction of the J/ψ, and the charmonium mass spectrum provide a very consistent set of values of α_s at a variety of scales. In particular, they show the running of α_s by a factor of about three from m_r to m_z. Results from LEP also provide evidence of the triple gluon vertex. Similarly, the measurement of the b bar b fraction of Z degrees decays, from the MARK II as well as LEP, provide increasingly better measurements of the Z degree coupling to b quarks. Combined with earlier precision measurements of the Z degrees mass, width, and leptonic branching fractions, the Z degrees decays continue to provide a very precise verification of the Standard Model

[en] The authors report the results of a beam test at KEK using double-sided AC-coupled silicon microstrip detectors with binary readout, i.e., a readout where the signals are discriminated in the front-end electronics and only the hit location is kept. For strip pitch between 50micro and 200micro, they determine the efficiency and the noise background as function of threshold setting. This allows them to reconstruct the Landau pulse height spectrum and determine the signal/noise ratio. In addition, the threshold/noise ratio necessary for operation with low occupancy is determined

[en] The SLAC Mark II detector is being improved by the addition of a new main drift chamber and associated electronics to prepare it for operation as the first detector at SLC. Presented here are the initial signal processing electronics, the preamplifiers, amplifiers and discriminators for the 5832 sense wires, which are located on the detector itself. The performance of the detector is established almost entirely by the drift chamber and this electronics

[en] The authors have designed and tested a 64 channel amplifier-comparator integrated circuit on the Maxim SHPi bipolar process. The low power design, 840 microW/channel, is intended for use as a front end with high clock rate silicon strip detector systems. Peaking time at the comparator input is 20 ns, for good double pulse resolution, and noise is near optimum for the technology used. They have used the chip successfully in a proton beam test at KEK in Japan with a 40 MHz data clock

[en] This paper quantifies the design parameters for a central tracking system capable of good momentum measurements and high reconstruction efficiency for charged particles within 1 TeV jets. The authors express our results as a set of scaling rules. Based on these rules we outline a silicon strip tracking system which is well matched to the SSC high luminosity environment. Special challenges for the construction of this tracker are in the area of electronics readout. The authors present initial work we have done in this area

No abstract available