Mior (private homepage)
Name: Ulf Mjörnmark
Title: PhD, research engineer
Phone: ++46 - (0)46-2227693
Fax: ++46 - (0)46-2224015
Past and current projects
1977-1978: SPSC/P 88, Polarized Jet Collaboration
During the summer 1977 was I as a summer student at CERN, working in the
Polarized Jet Collaboration. This I continued with after the stay CERN,
when I started as a PhD student at Lund University. My work was part of
the proposal to study spin effects in proton-proton reactions at the SPS
accelarator at CERN, using a polarized atomic hydrogen jet target inside
the vacuum pipe of the accelerator. My main contribution was a study of
the reconstruction of the lambda from its decay into a proton and a pion.
The proposal was refused, mainly because of the impact on the vacuum of
1978-1983: R807, Axial Field spectrometer (AFS)
The Axial Field Spectrometer (AFS) consisted mainly of a 2 pi Uranium-copper
calorimeter, and a cylindrical drift chamber. These detectors were designed
to study jet phenomena. Two NaI walls were positioned at opposite sides
of the inetraction point making it possible to study direct photons and
electrons. In addition, the AFS had a set of small drift chambers surrounding
the beam pipes, used in glueball search, and a muon arm consisting of two
proportional chambers with an iron wall inbetween. During the first years
of operation was one of the uranium walls replaced by a cerenkov arm.
During 1979-1980 did I work at CERN with the front end readout. Early
1981 did I return to Lund to work on my thesis on vector meson production
in proton-proton and proton-antiproton interactions.
1983-1989: NA34, High Energy Lepton IOn Spectrometer (HELIOS)
HELIOS was a fixed target experiment at the SPS accelerator at CERN. The
apparatus was used in two slightly different setups, one for use with proton
beams, the other for use with ion beams (oxygen and sulphur). HELIOS was
designed for the purpose of studying production of electrons, muons and
neutrinos. This required detectors capable of identifying leptons, and
the associated events. The apparatus cosnisted of a wire target, and a
silicon vertex detector. An electron spectrometer consisting of drift chambers,
and a transition radiation detector. A muon spectrometer with proportional
chambers, and a magnet. Hadron calorimeters were used to detect the associated
I had the main responsibilty of the design and implementation of the
data acquisition system. The front end electronics was in CAMAC, while
the readout software was running on CPUs in VME crates. The CPUs were programmed
in the language FORTH, of which a special dialect was developed within
the collaboration. The data was transferred to a VAX750, for monitoring
and tape writing.
During the period 1983-1986 was I fellow at CERN, since then have I
a position as research engineer at Lund University.
1989-2000 : DELPHI project.
DELPHI is one of the four experiments at LEP (Large Electron Positron collider)
at CERN. Working on the VSAT
The readout system of this detector was the main responsibility, including
the trigger hardware,Local Trigger Supervisor (LTS), front end signal generation
LURFB ( html
and the front end readout of the data, as well as offline data
quality checks. The data taking ended in 2000, when LEP was shutdown
to allow for the building of LHC.
1994-2007 : H1 project.
H1 is one of the two e-p collider experiments at DESY. One of the Lund
online projects in H1 is a radiation
monitor system. This system monitors the backgroun d close to the interaction
region and issues an alarm when the radiation exceeds a given level. The
system is composed of radiation sensitive diodes, the analog signals from
the diodes is digitized with a VME based FADC system. A hardware counter,
is used to issue the alarm. The complete system is controlled from a MacIntosh.
The rate history can be seen in RMAC
rates. Took part in the Data Acquisition of the Very Forward Proton Spectrometer (VFPS).
1998- : ATLAS project.
ATLAS is one of the proposed experiments at the future proton-proton collider
(Large Hadron Collider - LHC) at CERN. Lund participates in the design
of the readout chip (DTMROC) and associated
for the TRT detector.
2007-2011 : EUDET project.
EUDET is a project to develop detectors for a future linear collider.
Lund participates in the readout of a prototype TPC with GEMs (LCTPC). The electronics
is based on the electronics used in the ALICE experiment at LHC. The system has been
tested 2009-2011 in a testbeam at DESY.
2011- : AIDA project.
AIDA is the continuation othe EUDET project.
Ulf Mjörnmark, Last update: 30 May 2001