Refine
Year of publication
Document Type
- Article (11)
- Working Paper (8)
- Conference Proceeding (5)
- Report (2)
- Doctoral Thesis (1)
- Lecture (1)
- Other (1)
Has Fulltext
- yes (29)
Is part of the Bibliography
- no (29)
Keywords
- CVID (1)
- European Society for Immunodeficiencies (ESID) (1)
- German PID-NET registry (1)
- IgG substitution therapy (1)
- Linearer Collider ; Hohlraumresonator ; Moden ; Dämpfung ; Güte <Schwingkreis> ; Messung (1)
- PID prevalence (1)
- Q-factor (1)
- electromagnetic field (1)
- measurement (1)
- primary immunodeficiency (PID) (1)
Institute
- Physik (27)
- Biowissenschaften (1)
- LOEWE-Schwerpunkt für Integrative Pilzforschung (1)
- Medizin (1)
To preserve the required beam quality in an e+/e- collider it is necessary to have a very precise beam position control at each accelerating cavity. An elegant method to avoid additional length and beam disturbance is the usage of signals from existing HOM-dampers. The magnitude of the displacement is derived from the amplitude of a dipole mode whereas the sign follows from the phase comparison of a dipole and a monopole HOM. To check the performance of the system, a measurement setup has been built with an antenna which can be moved with micrometer resolution to simulate the beam. Furthermore we have developed a signal processing to determine the absolute beam displacement. Measurements on the HOM-damper cell can be done in the frequency domain using a network analyser. Final measurements with the nonlinear time dependent signal processing circuit has to be done with very short electric pulses simulating electron bunches. Thus, we have designed a sub nanosecond pulse generator using a clipping line and the step recovery effect of a diode. The measurement can be done with a resolution of about 10 micrometers. Measurements and numerical calculations concerning the monitor design and the pulse generator are presented.