109454532
Online monitoring of laserpulses using the GPIB-interface of a Tektronix 2430 Digital Storage Oscilloscope
One of the monitoring aspects of holography at the 15 foot Bubble Chamber is the online checking of the lightoutput of the JK2000 ruby laser. Ideally the lightoutput should be a squared pulse in time. Spikes, pre- and postlasing (i.e., lasing before and after the squared pulse) can have a negative influence on the holograms. The scheme for monitoring the lightoutput is discussed in this paper as well as the programming codes and experimental setup necessary to enhance the holography. 1 fig.
118970720
Scaling Variable Distributions for Neutrino Proton Interactions in the Fermilab 15-ft. Bubble Chamber with External Muon Identifier
The Fermilab 15-ft. liquid hydrogen bubble chamber was exposed to a one-horn neutrino beam produced by 300 GeV/c protons. Data from 75,000 pictures yielding 343 events after cuts are analyzed here. Previous publications [1] have presented scaling variable (x and y) distribution from these same data analyzed without the use of auxilliary muon identification. These previous results depended upon the use of a purely kinematic method [2] for the identification of the muon in charged current events and thus for the separation of charged current (CC) and neutral current (NC) events. Since there might be important biases and backgrounds in the kinematic selection method, it is important to re-examine the data by means of a different selection method with different, and hopefully smaller, biases. The External Muon Identifier (EMI) mounted on the bubble chamber permits such an analysis.
119827566
Holography of particle tracks in the Fermilab 15-foot bubble chamber
204013563
KEKB beam collision stability at the picosecond timing and micron position resolution as observed with the Belle detector
Using the Belle detector we study the characteristics of beam collisions at the KEKB 3.5 GeV e+ on 8 GeV e− asymmetric energy collider. We investigate the collision timing tIP and its z-coordinate along the beam axis zIP as a function of the position of the colliding bunch in a beam train. The various tIP and zIP behaviors observed by Belle are attributed to beam loading effects in the radio frequency cavities that accelerate the beams with a beam abort gap. We report these results in detail and discuss the prospects for the SuperKEKB collider.
122531862
The Design of the Magnetized Muon Shield for the Prompt Neutrino Facility
The main technical challenge in the design of the prompt neutrino beam is the magnetized muon shield. Two satisfactory alternate designs have been developed for such a shield during this past year and the background muon fluxes have been calculated by three independent programs at Columbia, Fermilab, and MIT. The background muon fluxes have been calculated to be satisfactory in all of the detectors that might use the beam. In Section III of this report we describe in detail the three Monte Carlo programs used in these calculations. In Section IV we give the details of the flux calculations for the E-613 shield and the comparisons with the observed fluxes with various configurations of that shield. In Section V we describe the designs that have been developed for the neutrino area shield. In Section VI we discuss the problem of proton beam transport losses and the associated muon fluxes. Finally, in Section VII a comparison of the two solutions is made which covers cost, effectiveness, schedule and responsiveness to future unknowns. We conclude that there are not overwhelming reasons for the choice of one design over the other. However, for a variety of secondary reasons the superconducting design offers advantages.more » We therefore propose the construction of the prompt neutrino facility with the superconducting magnet design.« less
123547474
The BELLE TOF system
Abstract The BELLE TOF system provides π/K separation for particle momentum below 1.2 GeV /c . A novel Time Stretcher TDC scheme is used to measure flight times with a 25 ps LSB in the high rate environment of KEKB. The TOF resolution is found to be 100 ps. The TOF system also provides precise event timing to the BELLE trigger system.
122601142
SVX', the new CDF silicon vertex detector
Abstract The Collider Detector at Fermilab (CDF) radiation hardened silicon vertex detector (SVX') is described. The new detector has several improvements over its predecessor such as better signal to noise and higher efficiency. It is expected to have a radiation tolerance in excess of 1 Mrad. It has been taking data for several months and some preliminary results are shown.
120780052
Radiation damage experience at CDF with SVX
Abstract The radiation damage experience of the silicon vertex detector used in the CDF experiment during the 1993–1995 collider run is described. The detector is single sided, AC coupled, FOXFET biased, and uses radiation hard readout chips. The detector's noise is seen to increase anomalously with radiation dose.