Erlangen 2001 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 18: Instrumentation und Anwendungen II

HK 18.3: Talk

Tuesday, March 20, 2001, 15:00–15:15, E

Stripline beam position monitors for ELBE — •Pavel Evtushenko¹, Hartmut Buettig¹, Andre Buechner¹, Kevin Jordan², Peter Michel¹, and Rico Schurig¹ — ¹FZ Rossendorf,Institut fuer Kern- und Hadronenphysik — ²TJNAF, Newport News, Virginia, USA

The ELBE accelerator needs a non-destructive system for measurement of the electron beam position at about 30 locations. To obtain the required resolution about 100 microns a system of stripline beam position monitors (BPM) is under design. The stripline BPM can work in full power mode almost without influence on the beam. We tested a BPM prototype with the 250 keV beam from the ELBE injector. The resolution of the BPM was measured as a function of the electron beam current. At an electron beam current of 1mA the resolution is about 30 microns. One of the BPM’s will be installed upstream the cryomodule. Since the power spectrum of the beam depends on the bunch length, measurements in the frequency domain give information about the length of the bunch entering the cryomodule with RF cavities. Consequently the BPM serves for setting correct phase and power of both bunchers of the injector and for measurements of the electron beam position at the entrance of the cryomodule. There are two alternative schemes of the BPM electronics under development. The first one is based on the logarithmic amplifier AD8313, another one on the an rms-responding true power detector AD8361. Both of them can process RF signals with frequencies up to 2.5GHz.