122497415
R&D on Proton Extinction Monitor for COMET Project
The COMET experiment searches for a muon to electron conversion process that is one of the lepton flavor violation processes. We use an 8‐GeV pulsed proton beam. The proton extinction ratio is an important parameter. In order to measure this ratio pulse‐by‐pulse, we are developing a monitoring device. This device is called Proton Extinction Monitor and is a gas Cerenkov detector with gating photomultiplier tubes(PMT). The result of the investigation is that ethane is a promising gas for the Cerenkov radiator gas. A gating PMT is under development. We fabricated a divider circuit which switches at 10‐kHz and has a cutoff ratio of 10−6.
119666550
FFAG Construction for PRISM
The construction of the PRISM‐FFAG ring has been started. It would be completed by the end of JFY 2005. Then phase‐rotation, muon acceleration and muon ionization cooling could be studied using the ring. This paper describes the present designs of the RF system and the magnet system of PRISM‐FFAG and its construction schedule.
123942386
R&D STATUS OF THE HIGH-INTENSE MONOCHROMATIC LOW-ENERGY MUON SOURCE : PRISM
PRISM is in the works to build a future intense lowenergy muon source, which combines monochromaticity and high purity. In the PRISM project, an FFAG is used as the phase rotator to achieve the monochromatic muon beams. This paper will describe the design status the project.
162176254
Development on Electromagnetic Calorimeter for COMET / PRISM
120026558
Hyperon-proton scattering experiments with a scintillating fiber detector at KEK
Abstract Hyperon-proton scattering is being studied at KEK in order to obtain a better understanding standing of the baryon-baryon interaction. A scintilating fiber (SCIFI) block detector has been used as a production target of hyperons as well as a target for hyperon scattering on hydrogen. The pilot experiment (E251) for Σ + p scattering has been completed, and the next experiment (E289) for Σ + p, Σ − p and Λp channels has finished its data taking and is now uder analysis.
119662047
Development and performance of resistive seamless straw-tube gas chambers
Abstract A new straw-tube gas chamber which is made of seamless straw-tubes, instead of ordinary wound-type straw-tubes is developed. Seamless straw-tubes have various advantages over ordinary wound-type ones, in particular, in terms of mechanical strength and lesser wall thickness. Our seamless straw-tubes are fabricated to be resistive so that the hit positions along the straw axis can be read by cathode planes placed outside the straw-tube chambers, where the cathode strips run transverse to the straw axis. A beam test was carried out at KEK to study their performance. As a result of the beam test, the position resolution of the cathode strips of 220 μ m is achieved, and an anode position resolution of 112 μ m is also obtained.
126008905
An Asymmetric collider with the TRISTAN Main Ring