Schwiening, Jochen

jochen@slac.stanford.edu


Abstract 1

The performance of the BaBar DIRC

 Jochen Schwiening


The BaBar DIRC, a novel type of Cerenkov ring imaging device, is the primary hadronic particle identification system for the BaBar detector at the PEP-II asymmetric B-Factory at SLAC. The DIRC images the light trapped by internal reflection in long fused slica bars that serve simultaneously as the Cerenkov radiator and as light guides.

The light is transported down the bars to an imaging region located outside the detection region, where the images are formed and observed in a array of photomultiplier tubes. BaBar begin taking date with colliding beams in late spring of 1999. This talk will describe the PID performance attained by the DIRC, and will highlight some representative physics channels that use DIRC particle ID.

Abstract 2

Operation of the DIRC at the High Luminosity PEP-II Collider

 Jochen Schwiening


    The BaBar DIRC has been in routine operation at the PEP-II asymmetric B-Factory at SLAC for nearly 3 years. It is operationally very stable and robust. However, there are a number of unusual issues associated with the DIRC and its operation at the high luminosities of the B factory that will be highlighted in this talk. 

    These include (1) the stability of PMT windows immersed in ultra-pure water; (2) backgrounds from soft photons that interact in the water tank; (3) maintainance of the pure water system; (4) the long term stability of photon detection efficiencies; and (5) issues that might be expected to arise as the machine luminosity increases to 10x design .

Presentations:

You can download the presentation in PPT (MS PowerPoint)  format

  1. Right click on the icon   Schwiening_Jochen01.ppt (2213 kb)
                                                Schwiening_Jochen02.ppt ( 2265 kb)

  2. select "Save Target As....."

  3. Specify the folder you want to store the file

  4. select  "Save"

Photo:


You can  see the photograph larger by clicking the thumbnail

or download  it (high resolution) in zip format

  1. Right click on the icon Schwiening_Jochen.zip (1472 kb )

  2. select "Save Target As....."

  3. Specify the folder you want to store the file

  4. select  "Save"