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Title: Analysis of the short-to-ground event in the LARP-AUP MQXFAP1 magnet, and its implication on the production and tests of the series magnets

Abstract

Starting from 2022, the Large Hadron Collider (LHC) at CERN will be shut down to increase the luminosity of the machine. One of the main interventions will be inserting more performing low-β quadrupoles, called MQXF, in the interaction points. The US is involved in this activity with the US HL-LHC Accelerator Upgrade Project (AUP), and is responsible of the production and test of the Q1 and Q3 cryo-assemblies (each one containing two 4.2-m magnets in a single cold mass) of the triplet. After completing the US short model phase, the prototyping phase has started with MQXFAP1 (1st prototype, 4m long) test at the Brookhaven National Laboratory vertical test facility. However, after the magnet reached nominal current, a short-to-ground event stopped the test when the magnet was at 97.5% of acceptance current. In this paper, an analysis of this event is presented. We present how the short event can be modeled, and we base our conclusions on simulations and experimental evidence, trying to explain the mechanism that led to the short-to-ground formation. The short-to-ground has occurred in a coil that was known to have a previous coil-to-heater short. Therefore, we explain the connection between these two events, the possible risks formore » the future magnets, and how to prevent this issue from happening again in the series magnets.« less

Authors:
 [1];  [1]; ORCiD logo [2];  [2];  [3];  [1];  [1]
  1. Fermilab
  2. Brookhaven
  3. CERN
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
Accelerator Upgrade Project
OSTI Identifier:
1490834
Report Number(s):
FERMILAB-PUB-18-580-TD
1712630
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Marinozzi, Vittorio, Ambrosio, Giorgio, Muratore, Joseph, Joshi, Piyush, Ravaioli, Emmanuele, Stoynev, Stoyan, and Wanderer, Peter. Analysis of the short-to-ground event in the LARP-AUP MQXFAP1 magnet, and its implication on the production and tests of the series magnets. United States: N. p., 2018. Web.
Marinozzi, Vittorio, Ambrosio, Giorgio, Muratore, Joseph, Joshi, Piyush, Ravaioli, Emmanuele, Stoynev, Stoyan, & Wanderer, Peter. Analysis of the short-to-ground event in the LARP-AUP MQXFAP1 magnet, and its implication on the production and tests of the series magnets. United States.
Marinozzi, Vittorio, Ambrosio, Giorgio, Muratore, Joseph, Joshi, Piyush, Ravaioli, Emmanuele, Stoynev, Stoyan, and Wanderer, Peter. Mon . "Analysis of the short-to-ground event in the LARP-AUP MQXFAP1 magnet, and its implication on the production and tests of the series magnets". United States. https://www.osti.gov/servlets/purl/1490834.
@article{osti_1490834,
title = {Analysis of the short-to-ground event in the LARP-AUP MQXFAP1 magnet, and its implication on the production and tests of the series magnets},
author = {Marinozzi, Vittorio and Ambrosio, Giorgio and Muratore, Joseph and Joshi, Piyush and Ravaioli, Emmanuele and Stoynev, Stoyan and Wanderer, Peter},
abstractNote = {Starting from 2022, the Large Hadron Collider (LHC) at CERN will be shut down to increase the luminosity of the machine. One of the main interventions will be inserting more performing low-β quadrupoles, called MQXF, in the interaction points. The US is involved in this activity with the US HL-LHC Accelerator Upgrade Project (AUP), and is responsible of the production and test of the Q1 and Q3 cryo-assemblies (each one containing two 4.2-m magnets in a single cold mass) of the triplet. After completing the US short model phase, the prototyping phase has started with MQXFAP1 (1st prototype, 4m long) test at the Brookhaven National Laboratory vertical test facility. However, after the magnet reached nominal current, a short-to-ground event stopped the test when the magnet was at 97.5% of acceptance current. In this paper, an analysis of this event is presented. We present how the short event can be modeled, and we base our conclusions on simulations and experimental evidence, trying to explain the mechanism that led to the short-to-ground formation. The short-to-ground has occurred in a coil that was known to have a previous coil-to-heater short. Therefore, we explain the connection between these two events, the possible risks for the future magnets, and how to prevent this issue from happening again in the series magnets.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:

Figures / Tables:

Figure 1 Figure 1: training curve of MQXFAP1

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