5,212 research outputs found
Virtual Photon Structure from Jet Production at HERA
The feasibility of measuring parton distribution functions of of virtual
photons via the jet production at HERA is investigated.Comment: Contribution to the Workshop on "Future Physics at HERA", eds. G.
Ingelman, A. De Roeck, R. Klanner,4 pages, 3 figures, epsfi
Design and First Tests of a Radiation-Hard Pixel Sensor for the European X-Ray Free-Electron Laser
The high intensity and high repetition rate of the European X-ray
Free-Electron Laser, presently under construction in Hamburg, requires silicon
sensors which can stand X-ray doses of up to 1 GGy for 3 years of operation at
high bias voltage. Within the AGIPD Collaboration the X-ray-radiation damage in
MOS Capacitors and Gate-Controlled Diodes fabricated by four vendors on
high-ohmic n-type silicon with two crystal orientations and dif- ferent
technological parameters, has been studied for doses between 1 kGy and 1 GGy.
The extracted values of oxide-charge and surface-current densi- ties have been
used in TCAD simulations, and the layout and technological parameters of the
AGIPD pixel sensor optimized. It is found that the op- timized layout for high
X-ray doses is significantly different from the one for non-irradiated sensors.
First sensors and test structures have been de-livered in early 2013.
Measurement results for X-ray doses of 0 to 10 MGy and their comparison to
simulations are presented. They demonstrate that the optimization has been
successful and that the sensors fulfill the required specifications
Future ep Physics: The Outlook for HERA
The luminosity of the electron-proton collider, HERA, will be increased by a
factor of five during the long shutdown in the year 2000. At the same time
longitudinal lepton beam polarisation will be provided for the collider
experiments H1 and ZEUS. These far reaching upgrades to the machine will be
matched by upgrades to the detectors. The result will be a unique facility for
the study of the structure of the proton and the nature of the strong and
electroweak interactions. The physics potential of the upgraded accelerator is
discussed here together with a brief description of the HERA machine and
collider detector upgrades.Comment: 13 pages, Late
On the low x behaviour of nuclear shadowing
We calculate the x dependence of nuclear shadowing at moderate values of Q^2
by using HERA diffractive data and, for consistency, F2 parameterization of
ZEUS. We show that no decrease of shadowing occurs down to very low x (x =
10^-4).Comment: 9 pages, submitted on june for publicatio
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