ANL, Argonne
YerPhI, Yerevan
A 5-wire vibrating wire monitor (VWM005) was developed and tested at the Advanced Photon Source (APS). The sensor was mounted on the outboard side of a bending-magnet synchrotron radiation terminating flange in sector 37 of the APS storage ring. The parallel wires were separated vertically by 0.5 mm; however, due to the possibility of rotation about a horizontal axis, the effective distance between the wires was reduced by 30%. To increase the response speed, the sensor was installed in air, resulting in a step response time of less than one second. Due to the extreme sensitivity of the detector, the very hard x-ray component of synchrotron radiation was successfully measured after its passage through the terminating flange.
DESY, Hamburg
The former electron and proton preaccelerator PETRA at DESY is currently reconstructed and will be converted into the most brilliant storage-ring-based X-ray source worldwide called PETRAIII. The commissioning is scheduled for January 2009. It will operate at 6 GeV with 100 mA stored current and with a design emittance of 1 nm rad. Top-up operation is foreseen right from the beginning to reduce changes in heat-load and thermal drifts to a minimum,. Suitable beam diagnostic instrumentation and machine protection systems have to be established to guarantee the low emittance, a sub-micron beam stability as well as a save machine operation. To ensure a very high availability of the beam in top-up mode, the injector and preaccelerator diagnostic systems will be refurbished as well. A complete overview of the instrumentation and their latest developments to achieve these goals will be presented.
SLAC, Menlo Park, California
The Linac Coherent Light Source (LCLS) must deliver a high quality electron beam to the undulator. High resolution beam position monitoring is required to accomplish this task. Critical specifications are a dynamic range of 0.08-8.0 nC with a 5 microns resolution at 200 pC. New processor electronics was designed, processing is based on filtering the signals and direct digitization of the resulting pulse train. The processor consists of an Analog Front-End (AFE) and Analog-to-Digital Converter (ADC) boards, all are packed into 19-in rack mount chassis, 1U high. AFE board has a very low input noise, approximately 3 microV rms in a 7 MHz bandwidth centered at 140 or 200 MHz. The maximum gain is 34 dB with attenuation of up to 46 dB in 1 dB step. An on-board pulser sends the short CW burst to the striplines to perform between pulse calibration. The ADC board has four 16-bit digitizers, the sampling frequency is 120 MHz. The low-jitter clock is on a separate board in the same chassis. For the LCLS injector 22 prototypes of the processors were built and installed in 2007. Measured resolution at 200 pC is typically 3-5 microns. The 53 improved and modified processors are in production