54225329
DEVELOPMENT OF A FAST,SINGLE-PASS,MICRON-RESOLUTION BEAM POSITION MONITOR SIGNAL PROCESSOR:BEAM TEST RESULTS FROM ATF2
We present the design of a stripline beam position monitor (BPM) signal processor with low latency (c. 10ns) and micron-level spatial resolution in single-pass mode. Such a BPM processor has applications in singlepass beamlines such as those at linear colliders and FELs. The processor was deployed and tested at the Accelerator Test Facility (ATF2) extraction line at KEK, Japan. We report the beam test results and processor performance, including response, linearity, spatial resolution and latency.
58892392
LATEST BEAM TEST RESULTS FROM ATF2 WITH THE FONT ILC PROTOTYPE INTRA-TRAIN BEAM FEEDBACK SYSTEMS
We present the design and beam test results of a prototype beam-based digital feedback system for the Interaction Point of the International Linear Collider. A custom analogue front-end signal processor, FPGA-based digital signal processing boards, and kicker drive amplifier have been designed, built, deployed and tested with beam in the extraction line of the KEK Accelerator Test Facility (ATF2). The system was used to provide orbit correction to the train of bunches extracted from the ATF damping ring. The latency was measured to be approximately 140 ns.
59319996
DEVELOPMENT OF A TURN-BY-TURN BEAM POSITION MONITORING SYSTEM FOR MULTIPLE BUNCH OPERATION OF THE ATF DAMPING RING
An FPGA-based monitoring system has been developed to study multi-bunchbeam instabilities in the damping ring (DR) of the KEK Accelerator Test Facility (ATF). The system utilises a stripline beam position monitor (BPM) and single-stage down-mixing BPM processor. The system is designed to record the horizontal and/or vertical positions of up to three bunches in the DR with c. 150ns bunch spacing, or the head bunch of up to three trains in a multi-bunch mode with a bunch spacing of 5.6 ns. The FPGA firmware and data acquisition software allow the recording of turnby-turn data. An overview of the system and performance results will be presented.
122563794
A new photomultiplier tube utilising channel plate electron multipliers as the gain producing elements
Abstract A survey of the properties of a new type of photomultiplier tube is presented. The device is a planar structure in which two cascaded channel plate electron multipliers (CPEM) produce charge gain factors of greater than 10 7 with a transit time of 1 ns. The single electron pulse rise time and transit time spread figures are 1 ns and 2.5 ns fwhm. The tube has shown its ability to operate satisfactorily in magnetic fields of 1 T without magnetic screening. Saturation of the tube occurs at a peak pulse current of 40 mA with plastic scintillator pulses. However the high plate impedances cause serious rate limitations with high output pulses.
18645695
The recent operational performance of the CERN omega ring imaging cerenkov detector
We discuss the design and construction of the Time Projection chambers (TPCs) of the Omega Ring Imaging Cerenkov Detector (RICH). Details are given of the TPC high voltage system and its monitoring and control. In addition, the operation and monitoring of the readout is described together with results of tests on the performance of the front end amplifiers. The operation of the RICH TPCs and electronics during the first data run of WA69, in 1984, is discussed together with relevant results from laboratory tests. Results from the preliminary analysis of a sample of data from the 1984 run are also presented.
24058982
The Omega Spectrometer Ring Imaging Cerenkov Detector Recent Detector Modifications and Event Analysis
A Ring Imaging Cerenkov (RICH) detector has now been successfully operated throughout a high-energy (70-200 GeV/c) photoproduction experiment at the CERN Omega Spectrometer. Recently complementary data using a hadron beam was taken with the same equipment. In each case about 20 million interactions were recorded. We discuss here features of the RICH device not yet described in previous publications and indicate by means of examples the way in which the RICH information is being used in the context of the overall experimental data analysis.