108012017
GRID DRIVEN POWER AMPLIFIER FOR MARK I MTA ACCELERATOR
A driven power amplifier r-f system was installed on thc Mark I linear accelerator for Run No. 10. The system, which used RCA A-2332 superpower, shield- grid triodes as final power amplifiers, is described. Problems associated with the initial excitation of the cavity and the techniques used to solve them are discussed. (auth)
108181646
ELECTRIC FIELD MEASUREMENTS IN THE MARK I ACCELERATOR BY THE GLO-BALL METHOD
210852321
MARK I MTA LINEAR ACCELERATOR RUN NO. 3
Experimental operation of Mark I from July 29 through Sept. 24, 1952 is reported. During the preceding two months shutdown, spark-damaged drift tubes No. 0, 1, and 2 were repaired and chemically cleaned. After a slow "bake-in" procedure, a cavity voltage of 20-Mv at 16% duty cycle was obtained. Although operation was not too steady, some preliminary beam evaluation tests were made. Proton acceleration threshold voltage was determined to be 18.5 Mv, based on the associated rapid increase in neutron flux beyond the D-8B target. The beam was found to be about 1 in. off from the cavity axis at the target. A pulsed beam current of 50 to 70 ma peak was reached. The results indicated that there was nothing to prevent a high-current pulsed beam from being produced. However, in spite of careful cleaning and slow bake-in methods, sparking in the 0-1 gap was still a problem. Since small scale tests indicated that Inconel had better resistance to spark damage than the deoxidized highphosphorous Cu originally used, Mark I was shut down to install Inconel overlays on the first two drift tubes. (For preceding report in series see LRL-71.) (auth)
117582764
Lifetimes of some $b$-flavored hadrons
Recent measurements of lifetimes of some $b$-flavored hadrons are presented and interpreted in the context of theoretical models, especially the Heavy Quark Expansion. Decay widths and decay width differences in the $B_s^0-\overline{B}_s^0$ system are discussed from studies of decays into the final states $J/\psi K^+K^-$, $J/\psi \pi^+\pi^-$, $D_s^+D_s^-$, $K^+K^-$, and $D_s^{\pm}\pi^{\mp}$. Lifetime measurements of the baryons $\Lambda_b^0$, $\Xi_b^-$, $\Xi_b^0$, and $\Omega_b^-$ are also shown.
17198978
B Phenomenology
Many topics are discussed in b physics including lifetimes, decay mechanisms, determinations of the CKM matrix elements |Vcb| and |Vub|, facilities for b quark studies, neutral B meson mixing, rare b decays, hadronic decays and CP violation. I review techniques for finding physics beyond the Standard Model and describe the complimentarity of b decay measurements in elucidating new physics that could be found at higher energy machines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lectures presented at 55th Scottish Universities Summer School in Physics on Heavy Flavour Physics, A NATO Advanced Study Insititute, St. Andrews, Scotland, August, 2001.
125813999
EXPERIMENTAL DETERMINATION OF THE K-M MATRIX
118441159
The Magnetic Distortion Calibration System of the LHCb RICH1 Detector
The LHCb RICH1 detector uses hybrid photon detectors (HPDs) as its optical sensors. A calibration system has been constructed to provide corrections for distortions that are primarily due to external magnetic fields. We describe here the system design, construction, operation and performance.
17798115
THE Goals and Techniques of BTeV and LHC-B
BTeV and LHC-B are experiments being proposed to study $b$ and $c$ quark decays in hadron-hadron collisions with the aims to look for new phenomena beyond the Standard Model and to measure Standard Model parameters including CKM elements and decay constants. The physics goals, required detection techniques and simulations will be discussed.