My Work in the FLC TPC group
The main subject of my work is to implement a laser sytem in a TPC. In the case of
Reasearch and Development efforts there are three possibilities to produce tracks in a
gaseous detector. First possibility is to use cosmic muons, second to use particles
from a testbeam. An alternative possibility is to produce tracks from an UV laser system.
One advantage of an UV laser is the good reproducibility of laser tracks at a certain
position, another advantage is the comparabel simple splitting of a laser beam in two or
more beams. An additional opportunity is that a laser can be used for a lot of calibration
measurements in the detector. From the measurement of the drift velocity, that is a crucial
parameter in a TPC, to calibrations of electric and magnetic field inhomogenities a
UV laser provides various opportunities to check or cross-check these parameters. One important
point are the diffrent production processes between a Minimal Ionising Particle (MIP) and
a laser track. In the case of MIP's a significant production of so called delta electrons takes
place. In the case of a laser you ionize the gas by a multi-photon process. Further studies
have to prove if this has an influence of the resolution of such laser tracks.
Links for me and my work
Current talks
→ talk lasersystem September 2004, Maria-Laach, Germany
→ High Magnetic Field Performance of a GEM-TPC October 2004, Rome, Italy
→ dpg talk 2005 March 2005, Berlin, Germany
→ R&D for a Time Projection Chamber at the ILC January 2006, Hamburg
→ dpg talk 2006 March 2006, Dortmund, Germany
Publications
→ Rekonstruktion von Neutralinos mit TESLA
→ DAQ System for Linear Collider TPC Prototypes
→ Development and studies of a time projection chamber with GEMs
Application documents
→ Curriculum Vitae (German Version)
→ Curriculum Vitae (English Version)
If you want to contact me, here's my adress at work.
Email: markus.ball@desy.de
Deutsches Elektronen-Synchrotron (DESY)
Notkestr. 85
D- 22607 Hamburg
Office:Build.1d, Room 22
Tel.: (+49) 40 - 8998 3426
Fax.:(+49) 40 - 8998 1812
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