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PROBLEM TO BE SOLVED: To obtain the electronic musical instrument which has nearly the same sesuous expressing power with an acoustic musical instrument by inputting a sound that a player has played to a resonance circuit as it is. SOLUTION: This instrument has a position sensor 13 as an interval determining means which determines an interval of sounding by varying in resistance value with a position pressed by the player. Its position information is inputted to a 1st parameter generating means 14 to calculate the value of a parameter for determining a resonance frequency from the position information (resistance value), and the value is inputted to the resonance circuit 15 as a sound source part together with the signal from a pickup 3. This resonance circuit 15 is obtained by electronically simulating a resonance body and has its resonance frequency determined according to the value of the parameter from the 1st parameter generating means 14, thereby exciting vibration with the signal inputted through the pickup 3. The signal generated by the resonance circuit 15 is outputted as a sound signal after a body sounding signal is added by a body simulator 16.

In the hadron experimental hall at the 50-GeV Proton Synchrotron (PS) of J-PARC, the secondary beam line K1.8 with double stage separator is expected to provide 1-2 GeV/c kaon beams with less contamination of pions mainly for hadron and nuclear physics experiments with strangeness. An electrostatic (ES) separator is one of key elements of this secondary beam line. The ES separator will generate a 75kV/cm electrostatic field between parallel electrodes of 10cm gap and 6m in length along the beam direction. It is designed so as to be radiation-proof and to lower spark rate at the high intensity proton accelerator facility. The K1.8 line has two 6m ES separators with the intermediate focal point upstream of separators to reduce the pion backgrounds from the production target. The K-/π- ratio of the line is expected to have a larger value than 1 at the experimental target. Beam commissioning of the K1.8 has just started. We will report separator performance, optics design of the K1.8 beam line and the first result of the beam commissioning., Proceedings of the 1st International Particle Accelerator Conference, IPAC2010, Kyoto, Japan

Optical beam measurement such as OTR(Optical Transition Radiation), ODR(Optical Diffraction Radiation), gas Cerenkov, and so on is a powerful tool to observe a two-dimensional information of high intensity beam profile, so that this method is widely used at various electron and hadron accelerators. However, high radiation field to damage an optical system gradually becomes a major issue with increasing the beam intensity to explore new physics. Our present effort is devoted to develop a high efficient optical system to resist such high radiation field. We newly designed an optical system composed of two spherical mirrors which do not have any lenses vulnerable to radiation. Detailed optics design and a result of optical performance test will be presented. Also we will report a result of a beam test experiment of this optics system combined with an OTR screen performed at high intensity proton extraction beamline of the J-PARC., Proceedings of the 1st International Particle Accelerator Conference, IPAC2010, Kyoto, Japan