The H1 Experiment
The H1 experiment was one of two large experiments at the electron-proton
collider
HERA
at the German laboratory DESY.
A central and a forward tracking system surrounded the interaction point in H1. The tracker consisted
of layers of drift chambers
and proportional chambers for trigger purposes. The tracker sat in a central hole in the cryostat of the liquid argon
calorimeter. The electromagnetic part used lead plates as absorber and the hadronic part used steal plates. The super
conducting solenoid coil surrounded the liquid argon calorimeter and provided a 1.2 Tesla magnetic field in the tracker.
The 2000 tonnes iron return yoke of the magnet was highly segmented and filled with limited streamer tubes. These
were used as muon detectors and to catch any hadronic energy leaking out of the liquid argon calorimeter. Muon tracks in
the forward direction were analysed in a spectrometer consisting of a toroidal magnet that was sandwiched between
layers of drift chambers. I worked with the organization
of the building, installation and testing of this spectrometer.
I also worked with the reconstruction and identification of jets in deep
inelastic scattering events.
HERA
The HERA (Hadron-Elektron-Ring-Anlage) accelerator at the DESY laboratory is to date
the worlds only lepton-hadron collider.
It was in operation during 1992-2007 and used the older 2.6 km long PETRA accelerator
as a pre-accelerator
for both electrons and protons. The accelerator had a circumference of 6.3 km
and collided at the start electrons or positrons
at 27 GeV with protons at 820 GeV (centre-of-mass energy 295 GeV).
It consisted of two storage rings located 15-30 m
underground with four 90 degree arcs followed by 360 m long straight sections.
The warm dipole magnets in the electron ring
had a field of 0.165 T while the 416 superconducting 9 m long dipole magnets
in the proton ring was operated at 4.65 T
during 820 GeV running. The accelerator was upgraded to reach higher
luminosities and it reached a peak luminosity of 5 x 1031 cm-2s-1
(total delivered luminosity 800 pb-1). The proton energy was also increased to 920 GeV.
Responsible for the content of this page is
Vincent Hedberg
