Erratum: State of the art online monitoring system for the waste beam in the rapid cycling synchrotron of the Japan Proton Accelerator Research Complex [Phys. Rev. ST Accel. Beams14, 072801 (2011)]

Abstract

We have identified a mistake in our paper and it appeared twice in the text and also in three figures throughout the article. The number of particles noted on page 5 (2:5 Â 10 13), page 8 (2 Â 10 13), plotted in the horizontal scale of Fig. 9, and the left vertical scales of Figs. 11 and 13 should be given as half the value. We note that the result and conclusion presented in the article are not affected by the mistake.

Measurement of 181 MeV H − ions stripping cross-sections by carbon stripper foil

“…The number of injected H À beam pulses were optimized to controlled injected beam intensity. In contrast to the H0CT, the maximum allowable intensity for which the beam profile measured by the MWPM7 not saturated was around 6 Â 11 11 , where the minimum was about 0.5 Â 11 11 . The above intensity range well covered the expected partially stripped H 0 and un-stripped H À yields for all foils used for the present The H þ charge fraction which is injected into the ring can thus be automatically calculated as 1À (H 0 þH À ).…”

“…The H0CT acts as an online monitor for the waste beam during RCS operation and its linearity has already been shown to be very good as was reported earlier [11]. The linearity of the MWPM7 was measured in the injection beam dump mode.…”

“…In order to extract the real beam signal from the huge background we have already established a precise technique and has proven to be very efficient for monitoring even a small quantity of the waste beam [11]. The time domain signal measured by the H0CT is taken by an on-line controlled oscilloscope and then a Fast Fourier Transformation (FFT) analysis is done.…”

Studies of Laser Power Reduction for the Laser Stripping of 400 MeV H− Beam at J-PARC RCS

“…where, is the flux of photons/cm 2 /see at the IP for H − in the PRF, is the neutralization cross section and is the interaction time. The can be expressed as, = ( /ℎ )(1 − cos ) (5) where, is the laser pulse energy, is the laser wavelength in PLF, is the laser cross sectional area, ℎ is the Planck's constant, is the speed of light, is the laser pulse length, , are relativistic parameters and is the interaction angle, which is almost 90 degree.…”

“…Although the foil did not break, severe foil deformation due to beam irradiation can easily be seen. To obtain the foil degradation, such as a foil thinning and governing pinholes, we precisely measured the waste beams of partially stripped H 0 and un-stripped H − , respectively [5,6]. The H 0 was measured to be increased more than twice from the initial value, corresponding to a severe foil thinning of 11% as shown in Fig.…”