Hannes Reeg

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Low temperature superconducting quantum interference devices (LTS SQUIDs) are used to make precision measurements of electromagnetic fields in applications ranging from biomedicine to high energy physics. We have previously described an LTS SQUID-based device for nuclear physics which employs the Cryogenic Current Comparator principle (CCC). The CCC(More)
A new type of beam transformer, based on the principle of a Cryogenic Current Comparator (CCC), was built to measure extracted ion beams from the SIS, the heavy ion synchroton at GSI. A current resolution of 0:006 0:065 nA=Hz, depending on the frequency range, could be achieved allowing us to measure ion beams with intensities greater than 10 particles per(More)
In view of the upcoming FAIR project (Facility for Antiproton and Ion Research) several long-term development projects had been initiated with regard to diagnostic devices for beam current measurement. The main accelerator of FAIR will be the fast ramped superconducting synchrotron SIS100. Design parameters of SIS100 are acceleration of 2×10 protons/cycle(More)
As part of the GSI duties for the Heidelberg Ion Therapy (HIT), GSI Beam Diagnostics (BD) group acted as contractor for the delivery of beam diagnostic devices. This contract includes production of the mechanical parts (feed-throughs, detectors etc.) as well as installation and commissioning of the 92 different diagnostic devices at the HIT facility and,(More)
Monitoring of beam currents in particle accelerators without affecting the beam guiding elements, interrupting the beam or influencing its profile is a major challenge in accelerator technology. A solution to this problem is the detection of the magnetic field generated by the moving charged particles. We present a non-destructive beam monitoring system for(More)
For most beam parameters the stored current is monitored by a commercially available dc-transformer offering a dynamic range from 1 μA to 20 A maximum. Its bandwidth of 10 kHz allows determination of the beam lifetime with ms time resolution. But it is known, that these types of transformers have severe problems by a high current bunched beam passage [1].(More)
A cryogenic current comparator(CCC) is based on the properties of ideal superconductors to expel magnetic flux from the bulk material through shielding currents on the surface of the material. As this effect is only dependent on the magnetic field, the CCC allows measuring the magnetic field, e.g. generated by a passing ion beam, they can be measured(More)
Since 15 years the MAPS has been an indispensable tool for daily operation of the UNILAC, to visualize the actual beam current of the UNILAC macropulses at given locations being measured by 45 beam current transformers (BCTs). It also shows an overlay of the beam current signal with each related gate pulse, to allow for checks and adjustments of the(More)
The design of a compact 7 MeV/u, 217 MHz carbon injector linac for therapy facilities has been presented already in earlier reports [1]. In 2002 detailed specifications of the low energy beam transport line components like magnets, power supplies, beam diagnostics devices and vacuum components as well as of the ion source systems and of the linac rf system(More)
Online monitoring of low intensity (below 1 μA) charged particle beams without disturbing the beam and its environment is crucial for any accelerator facility. For the upcoming FAIR project a beam monitor based on the Cryogenic Current Comparator principle with an enhanced resolution was developed. The main focus of research was on the low temperature(More)