 Subjects -> INSTRUMENTS (Total: 62 journals)
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- Conceptual design report: a ring-based electron cooling system for the EIC
- Authors: V. Lebedev; S. Nagaitsev, A. Burov, V. Yakovlev, I. Gonin, I. Terechkine, A. Saini N. Solyak
Abstract: This report describes a concept of an EIC cooling system, based on a proven induction-linac
technology with a DC electron beam. The system would operate in a full energy range of proton beams
(100–270 GeV) and would provide 50–100 A electron beams, circulating in a cooler ring for 5 ms.
Every 5 ms a new electron pulse would be injected into the cooler ring to provide continuous cooling
at collisions. Operations with a 10-ms cycle is possible but it will reduce the cooling rates by
~30%. The system is capable of delivering the required performance in the entire EIC energy range
with emittance cooling times of less than 1–2 hours.
Citation: Journal of Instrumentation
PubDate: 2021-01-12T00:00:00Z
DOI: 10.1088/1748-0221/16/01/T01003
Issue No: Vol. 16, No. 01 (2021)
- Analysis of the natural electric field at different sea depths
- Authors: P. Yu; J.W. Zhang, J.F. Cheng R.X. Jiang
Abstract: The natural electric field at the depth of 0 ~ 1500 m in high seas of South China Sea is obtained by
using a new type of measuring device. The electric field data in the 0.01 ~ 0.5 Hz and 0.5 ~ 30 Hz
frequency range are analyzed respectively. The results show that the induced electric field
generated by the surface wave (about 0.14 Hz in the experiment) is obvious at the depth of 50 m but
can be ignored at the depth greater than 100 m. When the depth increases from 50 m to 1500 m, the
peak-to-peak value of the natural electric field gradually decreases. At the depth of 1000 m, the
peak-to-peak values are 0.04 ~ 0.08 μV/m in the 0.01 ~ 0.5 Hz range, and 0.07 ~ 0.1 μV/m in the
0.5 ~ 30 Hz range. At last, the natural electric field in coastal water near Sanya City, where the
water depth is 15 m, is measured by means of a sinking device. The results show that the
peak-to-peak values are about 2 ~ 4 μV/m in the 0.01 ~ 0.5 Hz range and 2 μV/m in the 0.5 ...
Citation: Journal of Instrumentation
PubDate: 2021-01-12T00:00:00Z
DOI: 10.1088/1748-0221/16/01/P01006
Issue No: Vol. 16, No. 01 (2021)
- Estimation of the origins and fractions of emitted light from acrylic
block during irradiation of
carbon-ions- Authors: S. Yamamoto; T. Akagi, M. Yamaguchi N. Kawachi
Abstract: Although light emission from an acrylic block during irradiation of carbon ions at lower energy than
the Cerenkov-light threshold was found recently, the origins and fractions of the light in the
images have not yet been clarified. Since light spectra may provide information to estimate the
origins and fractions of the light emission, we conducted optical imaging of an acrylic block during
irradiation of carbon ions using a charge-coupled device (CCD) camera with optical filters. We
measured the light images of the acrylic block with optical filters of different wavelengths using
an ultraviolet (UV)-sensitive CCD camera during carbon-ion irradiation with slightly higher energy
to produce secondary electrons to emit Cerenkov light (241 MeV/u). From the images, we derived depth
profiles with different wavelengths and calculated the spectra of the emitted light from the acrylic
block. The depth profiles showed higher intensity due to Cerenkov light at the...
Citation: Journal of Instrumentation
PubDate: 2021-01-11T00:00:00Z
DOI: 10.1088/1748-0221/16/01/P01004
Issue No: Vol. 16, No. 01 (2021)
- A sub-micron resolution, bunch-by-bunch beam trajectory feedback system
and its application to
reducing wakefield effects in single-pass
beamlines- Authors: D.R. Bett; P.N. Burrows, C. Perry, R. Ramjiawan, N. Terunuma, K. Kubo T. Okugi
Abstract: A high-precision intra-bunch-train beam orbit feedback correction system has been developed and
tested in the ATF2 beamline of the Accelerator Test Facility at the High Energy Accelerator Research
Organization in Japan. The system uses the vertical position of the bunch measured at two beam
position monitors (BPMs) to calculate a pair of kicks which are applied to the next bunch using two
upstream kickers, thereby correcting both the vertical position and trajectory angle. Using trains
of two electron bunches separated in time by 187.6 ns, the system was optimised so as to stabilize
the beam offset at the feedback BPMs to better than 350 nm, yielding a local trajectory angle
correction to within 250 nrad. The quality of the correction was verified using three downstream
witness BPMs and the results were found to be in agreement with the predictions of a linear lattice
model used to propagate the beam trajectory from the feedback region. This same mod...
Citation: Journal of Instrumentation
PubDate: 2021-01-11T00:00:00Z
DOI: 10.1088/1748-0221/16/01/P01005
Issue No: Vol. 16, No. 01 (2021)
- Off-axis parameters of PAL-XFEL planar undulator
- Authors: S. Lee; J.-H. Han
Abstract: The electron beam path in a planar undulator is usually chosen at the undulator magnetic center in
both the vertical and horizontal directions. In the case of the vertical-gap undulators of x-ray
free-electron lasers, best efforts are paid to align the vertical magnetic center to the reference
electron beam path. The twenty undulator segments are aligned vertically within 50 μm to obtain the
target K -values of the undulator segments in the PAL-XFEL hard X-ray beamline. Besides K -value,
undulator phase error and beam trajectory deflection are also concerned when the undulator is
misaligned to the beam path. In some cases, an off-set in the vertical direction is applied
intentionally when a transverse field gradient is required. In this report, we present the
systematic measurements of the phase error and trajectory deflection at vertical off-axes of a
PAL-XFEL hard X-ray undulator.
Citation: Journal of Instrumentation
PubDate: 2021-01-11T00:00:00Z
DOI: 10.1088/1748-0221/16/01/T01002
Issue No: Vol. 16, No. 01 (2021)
- 3D Printing Neutron Detectors using Scintillating BN/ZnS Resin
- Authors: P. Stowell; Z. Kutz, S. Fargher L.F. Thompson
Abstract: In this paper we demonstrate that it is possible to produce low cost neutron-sensitive detectors
using stereo-lithography additive manufacturing. A curable scintillating resin is made by mixing
BN/ZnS with a commercially available UV resin. This resin is used to print several small area
neutron detectors made of arrays of BN/ZnS cones that can be directly coupled to a photo-multiplier
tube.
Citation: Journal of Instrumentation
PubDate: 2021-01-11T00:00:00Z
DOI: 10.1088/1748-0221/16/01/P01003
Issue No: Vol. 16, No. 01 (2021)
- Radiation attenuation and photoluminescence properties of host tellurite
glasses doped with Er 3+
ions- Authors: M.S. Alqahtani; A.M. Almarhaby, K.I. Hussein, Y.M. AbouDeif, H. Afifi, H. Zahran, I.S. Yaha, I. Grelowska E. Yousef
Abstract: The application of shielding is one of the main protective measures in ionizing radiation safety.
This paper addresses the influence of erbium oxide (Er 2 O 3 ) amount fraction on shielding
properties of the glass system with compound formula 75TeO 2 -10Nb 2 O 5 -10ZnO-5PbO (TNZP).
Addition of Er 2 O 3 portions increased samples densities from 5.57 to 5.65 g/cm 3 . The attenuation
properties for the different TNZP-Er 2 O 3 samples were simulated using Phy-X/PSD software at vary
wide energy ranged from 0.015 to 15 MeV . Various radiation shielding parameters were evaluated
including; linear (LAC) and mass (MAC) attenuation coefficients, the half (HVL)- and tenth
(TVL)-value layers, the mean (MFP) free path, the total atomic (ACS) and electronic (ECS)
cross-sections and fast (FNRCS) neutron-removal cross-section. These parameters were also verified
by a comparison w...
Citation: Journal of Instrumentation
PubDate: 2021-01-11T00:00:00Z
DOI: 10.1088/1748-0221/16/01/P01002
Issue No: Vol. 16, No. 01 (2021)
- Measuring attenuation in signal propagation in Resistive-Plate Chambers
- Authors: X.Y. Xie; Q.Y. Li, C.H. Tian, M. Yuan Y.J. Sun
Abstract: This study simulated and measured the attenuation in signal propagation in a Resistive-Plate Chamber
(RPC) and analysed it as a loss of signal charge during propagation along the readout strip. The
measurement results revealed a strong correlation between the quantified rate of attenuation in
charge and the surface resistivity of the graphite layer of the RPC . The rates of attenuation in
amplitude and frequency of the signal were also measured, following which the mechanism of
attenuation in signal propagation was discussed. Potential methods to mitigate its effects were
studied using simulations.
Citation: Journal of Instrumentation
PubDate: 2021-01-07T00:00:00Z
DOI: 10.1088/1748-0221/16/01/P01001
Issue No: Vol. 16, No. 01 (2021)
- Optical readout studies of the Thick-COBRA gaseous detector
- Authors: F. Garcia; F.M. Brunbauer, M. Lisowska, H. Müller, E. Oliveri, D. Pfeiffer, L. Ropelewski, J. Samarati, F. Sauli, L. Scharenberg, A.L.M. Silva, M. van Stenis, R. Veenhof J.F.C.A. Veloso
Abstract: The performance of a Thick-COBRA (THCOBRA) gaseous detector is studied using an optical readout
technique. The operation principle of this device is described, highlighting its operation in a gas
mixture of Ar/CF 4 (80/20 %) for visible scintillation light emission. The contributions to the
total gain from the holes and the anode strips as a function of the applied bias voltage were
visualized. The preservation of spatial information from the initial ionizations was demonstrated by
analyzing the light emission from 5.9 keV X-rays of an 55 Fe source. The observed non-uniformity of
the scintillation light from the holes supports the claim of a space localization accuracy better
than the pitch of the holes. The acquired images were used to identify weak points and sources of
instabilities in view of the development of new optimized structures.
Citation: Journal of Instrumentation
PubDate: 2021-01-07T00:00:00Z
DOI: 10.1088/1748-0221/16/01/T01001
Issue No: Vol. 16, No. 01 (2021)
- Vibrating wire monitor: Versatile instrumentation for particle and photon
beam measurements with
wide dynamic range- Authors: S.G. Arutunian; A.V. Margaryan, G.S. Harutyunyan, E.G. Lazareva, M. Chung, D. Kwak D.S. Gyulamiryan
Abstract: The vibrating wire monitor proposed herein is based on the strong dependence of the frequency of the
pinched wire on its temperature. This dependence allows the measurement of a
particle/X-ray/gamma-ray beam that deposits part of its energy on the wire. A wide measured
temperature range from fractions of mK to hundreds of degrees allows the detection of beam
properties at a given position of the wire in space. It also enables preparing profiling of a beam
in a large dynamic range by scanning the wire through the beam. This review paper presents
information on various applications of a vibrating wire, including the method of resonance target
and the use of wire oscillations as a scanner for the profiling of thin beams.
Citation: Journal of Instrumentation
PubDate: 2021-01-04T00:00:00Z
DOI: 10.1088/1748-0221/16/01/R01001
Issue No: Vol. 16, No. 01 (2021)
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