NSLS-II Beam Diagnostics Overview

A new 3rd generation light source (NSLS-II) is in the early stages of construction at Brookhaven National Laboratory. The NSLS-II facility will provide ultra high brightness and flux with exceptional beam stability. It presents several challenges for diagnostics and instrumentation, related to the extremely small emittance. In this paper, we present an overview of all planned instrumentation systems, results from research and development activities; and then focus on other challenging aspects

Construction, assembly and tests of the ATLAS electromagnetic barrel calorimeter

The construction and assembly of the two half barrels of the ATLAS central electromagnetic calorimeter and their insertion into the barrel cryostat are described. The results of the qualification tests of the calorimeter before installation in the LHC ATLAS pit are given

Design of the LHC US ATLAS Barrel Cryostat

One of the experiments of CERN's Large Hadron Collider (LHC) is the ATLAS Liquid Argon detector. The Liquid Argon Barrel Cryostat is part of the United States contribution to the LHC project and its design is presented here. The device is made up of four concentric cylinders: the smallest and largest of which form a vacuum vessel enclosing a cold vessel cryostat filled with liquid argon. The Cryostat serves as the housing for an electromagnetic barrel calorimeter, supports and provides space in vacuum for a solenoid magnet while the toroidal opening furnishes room for a tracker detector. Design requirements are determined by its use in a collider experiment: the construction has to be compact, the material between the interaction region and the calorimeter has to be minimal and made of aluminum to reduce the amount of absorbing material. The design complies with code regulations while being optimized for its use in a physics environment. (2 refs)

Coldmass for LHC Dipole Insertion Magnets

Brookhaven National Laboratory (BNL) is building a number of magnets for the insertion regions of the Large Hadron Collider (LHC). This paper presents the magnetic design and the expected field quality in 2-in-1 dipole magnets. A unique feature of this cold mass design is the use of an oblate-shaped yoke. This concept permits a variety of BNL-built magnets to have a similar overall design and allows the LHC main dipole cryostat, post, etc., to be used in these magnets. The proposed oblate-shaped yoke also offers a way to reduce the overall cryostat size in future magnets. The dipoles will use the same 80 mm aperture coils as used in the Relativistic Heavy Ion Collider (RHIC) dipole magnets, but will use stainless steel collars. The design presented here is still evolving and the magnets may be built differently than described here

Development of High Stability Supports for NSLS-II RF BPMS

The NSLS-II Light Source being built at Brookhaven National Laboratory is expected to provide submicron stability of the electron orbit in the storage ring in order to fully utilize the very small emittances of the electron beam. This requires high stability supports for BPM pickup electrodes located near insertion device sources. Here we provide details for the design and development of these supports as well as measurement of thermal and vibrational stability of a prototype support

Coldmass for Lhc Dipole Insertion Magnets.

Brookhaven National Laboratory (BNL) is building a number of magnets for the insertion regions of the Large Hadron Collider (LHC). This paper presents the magnetic design and the expected field quality in 2-in-1 dipole magnets. A unique feature of this coldmass design is the use of an oblate-shaped yoke. This concept permits a variety of BNL-built magnets to have a similar overall design and allows the LHC main dipole cryostat, post, etc., to be used in these magnets. The proposed oblate-shaped yoke also offers a way to reduce the overall cryostat size in future magnets. The dipoles will use the same 80 mm aperture coils as used in the Relativistic Heavy Ion Collider (RHIC) dipole magnets, but will use stainless steel collars. The design presented here is still evolving and the magnets may be built differently than described here

Soft x-ray imaging with 35 period undulator at the NSLS

Prior to the Phase II shutdown at the National Synchrotron Light Source (NSLS) in March 1987, a 10-period mini-undulator was used for soft x-ray imaging on the temporary X-17T beamline for six months. During this brief period we gained considerable experience in the use of undulator radiation for high brightness applications, including the use of high power optics, and position feedback. We commissioned a new scanning microscope using high resolution zone plates, and a fast laser interferometer. The microscope made it possible to study zymogen granules (subcellular structures which play an important role in the secretion of digestive enzymes in the pancreas) in an unaltered state: whole, unfixed, unstained and suspended in water. The first images displayed a distribution of material different than that seen in electron microscopy. In addition, fixed and air dried zymogen granules were the subject of Gabor holography. During the Phase II shutdown we made major changes to the entire system. At the present time the installation and commissioning of the new permanent line at beamline X-1A is at an advanced stage. The design, performance and the projected experimental program of this facility is the subject of this paper. 18 refs., 3 figs., 4 tabs

Long-term workforce participation patterns following head and neck cancer

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