Engineering topics

Sharma, Sushil

Publications and source records attributed to Sharma, Sushil.

7 records

DOE OSTI2024

Measurement of seasonal variations of the NSLS-II circumference and energy

Routine beam-based characterization of the NSLS-II storage ring indicated probable seasonal variations of the ring circumference and energy. We arranged regular direct measurements of the ring circumference during 2023 and compared the results with the archived data of the magnet and undulator settings. A clear correlation between the ring circumference and energy was observed. These seasonal variations of the ring energy are found to be the main reason for regular lattice corrections required to keep the machine performance stable for user operations. Finally, the measurement techniques and results are discussed in this article.

36 MATERIALS SCIENCE↗

DOE OSTI2024

Field Harmonic Measurement of High-Gradient Permanent Magnet Quadrupoles for NSLS- II Upgrade

The National Synchrotron Light Source II (NSLS-II) is preparing for a major upgrade based on a new lattice concept, known as “Complex Bend,” to replace its existing double bend achromat (DBA) lattice. Here, this novel lattice will use high-gradient permanent magnet quadrupoles (PMQs) with small apertures in the range of 16–22 mm. A prototype complex bend branch with PMQs has been installed in the NSLS-II linac to evaluate the lattice's performance. An accurate and precise magnetic measurement system is required for field harmonic characterization and magnetic tuning of these PMQs. As part of this project a Rotating-Coil bench, based on a Printed Circuit Board (PCB) coil with a 12 mm diameter, has been configured to measure nine PMQs with bore diameter of 12.7 mm. This PCB coil has an active length of 270 mm, and is able to measure fields up to the 15th harmonic of the main field at a reference radius of 5 mm, while maintaining field quality levels within 10 ppm of the main field. This article presents the PCB coil setup, the harmonic measurement results and their temperature dependencies and repeatability. Simulation results on compensation of undesired multipoles using “IDBuilder”, a genetic algorithm-based optimizer code for magnetic tuning is included for field harmonic corrections.

36 MATERIALS SCIENCE↗

DOE OSTI2022

A New PCB Rotating Coil at NSLS-II

Several R&D projects are underway at NSLS-II towards an upgrade of its storage ring with a new lattice that will use high field magnets with small bores of 16-22 mm. A large fraction of the high field magnets are expected to be of permanent magnet technology that will require precise magnetic measurements and field harmonics corrections. A new magnetic measurement bench has been built based on a printed circuit board (PCB) coil of 12 mm diameter and 270 mm active length. This PCB coil has the capabil-ity of measuring field quality to a level of 10 ppm of the main field up to the 15th harmonic with a sensitivity between 0.01 m2 and 0.02 m2 at the reference radius of 5 mm. This paper will describe the main features of the rotating coil bench and discuss the measurement results of a permanent-magnet Halbach quadrupole of 12.7 mm bore diameter.

43 PARTICLE ACCELERATORS↗

DOE OSTI2021

A New Magnetic Measurement System for the Future Low Emittance NSLS-II Storage Ring

A new magnetic measurement system is under construc-tion at BNL for accurate field harmonic measurements and fiducialization of magnets for a future upgrade of the NSLS- II storage ring. The entire storage ring is envi-sioned to be replaced with a new lattice concept, known as Complex Bend, which superimposes dipole and high-gradient quadrupole fields. The magnetic measurement system will use rotating wire and a PCB rotating coil specifically designed for small-aperture (< 15 mm) high gradient magnets. In this paper we describe in detail the mechanical design and the data acquisition hardware and software.

43 PARTICLE ACCELERATORS↗

DOE OSTI2018

Lessons Learned Study from the NSLS-II Storage Ring Magnet Procurement

This document was compiled in response to the suggestion made by the DOE SC Review of the NSLS-II Project on April 2012, and reiterated at the Review in July, 2013. The main contributors to this document are the SR magnet team A and other in-house participants in the Workshop B referred to below that took place on April 11 th and 12 th 2012 at BNL. The contributions also came from some external participants, including representatives of some of the suppliers who attended the workshop. Manufacturing of the magnets for the NSLS-II storage ring (~850 units of 15 types) took approximately 6 years from the beginning of the conceptual design to completion of manufacturing in October of 2012. The production in the early years did not go smoothly, and a DOE Review Committee expressed concerns in November of 2010 about the potential of significant delays in magnet deliveries. In response, the project undertook three major mitigation steps: 1) enhanced oversight by assignment of one technical representative for each of the seven suppliers, 2) appointment of a senior BNL scientist as the manager of the SR magnet production, and 3) streamlining the decision-making process. These steps led to a successful completion of magnet production and delivery with almost all magnets meeting their stringent specifications.

42 ENGINEERING↗

DOE OSTI2016

Thermal FEA for Front End Fixed Mask (SST)

The purpose of this study was to determine the temperature of the Fixed Mask using heat loads of the U42 Undulator. Finite Element Analysis was conducted on the fixed mask, to determine the temperature distribution on it, for 500 milli-amp current for NSLS-II. The Fixed mask has the sine wave surface profile.

36 MATERIALS SCIENCE↗

DOE OSTI2013

Survey and Alignment Reference Data Generation and Deviation Reporting

The data used by survey group can be categorized into design data and measured data based on how it’s obtained. Design data is a simple term which refers to the ideal beam orbit which is given by physics group in the form of a series of coordinates in lattice frame. Comparatively, measured data is a complicated term which includes the fiducialization data of each component, girder integration data, girder profiling data and control network data etc. There are a lot of steps and techniques to make sure a precise and successful alignment. However, from pure data perspective, making up right reference data and reporting misalignment correctly are 2 keys of survey and alignment. The note will give an overview regarding how survey data will be generated and reported during key steps. More details should be checked in the referred documents or discussed specifically.

36 MATERIALS SCIENCE↗