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Title: SNS STRIPPER FOIL FAILURE MODES AND THEIR CURES

Abstract

The diamond stripper foils in use at the Spallation Neutron Source worked successfully with no failures until May 3, 2009, when we started experiencing a rash of foil system failures after increasing the beam power to ~840 kW. The main contributors to the failures are thought to be 1) convoy electrons, stripped from the incoming H beam, that strike the foil bracket and may also reflect back from the electron catcher, and 2) vacuum breakdown from the charge developed on the foil by secondary electron emission. In this paper we will detail these and other failure mechanisms, and describe the improvements we have made to mitigate them.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [1];  [1];  [1]
  1. ORNL
  2. Brookhaven National Laboratory (BNL)
  3. Los Alamos National Laboratory (LANL)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE
OSTI Identifier:
1006451
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: IPAC10, Kyoto, Japan, 20100523, 20100528
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM STRIPPERS; ELECTRON EMISSION; FAILURE MODE ANALYSIS; FOILS; NEUTRON SOURCES; SPALLATION; MODIFICATIONS

Citation Formats

Galambos, John D, Luck, Chris, Plum, Michael A, Shaw, Robert W, Ladd, Peter, Raparia, Deepak, Macek, Robert James, Kim, Sang-Ho, Peters, Charles C, and Polsky, Yarom. SNS STRIPPER FOIL FAILURE MODES AND THEIR CURES. United States: N. p., 2010. Web.
Galambos, John D, Luck, Chris, Plum, Michael A, Shaw, Robert W, Ladd, Peter, Raparia, Deepak, Macek, Robert James, Kim, Sang-Ho, Peters, Charles C, & Polsky, Yarom. SNS STRIPPER FOIL FAILURE MODES AND THEIR CURES. United States.
Galambos, John D, Luck, Chris, Plum, Michael A, Shaw, Robert W, Ladd, Peter, Raparia, Deepak, Macek, Robert James, Kim, Sang-Ho, Peters, Charles C, and Polsky, Yarom. 2010. "SNS STRIPPER FOIL FAILURE MODES AND THEIR CURES". United States.
@article{osti_1006451,
title = {SNS STRIPPER FOIL FAILURE MODES AND THEIR CURES},
author = {Galambos, John D and Luck, Chris and Plum, Michael A and Shaw, Robert W and Ladd, Peter and Raparia, Deepak and Macek, Robert James and Kim, Sang-Ho and Peters, Charles C and Polsky, Yarom},
abstractNote = {The diamond stripper foils in use at the Spallation Neutron Source worked successfully with no failures until May 3, 2009, when we started experiencing a rash of foil system failures after increasing the beam power to ~840 kW. The main contributors to the failures are thought to be 1) convoy electrons, stripped from the incoming H beam, that strike the foil bracket and may also reflect back from the electron catcher, and 2) vacuum breakdown from the charge developed on the foil by secondary electron emission. In this paper we will detail these and other failure mechanisms, and describe the improvements we have made to mitigate them.},
doi = {},
url = {https://www.osti.gov/biblio/1006451}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 2010},
month = {Fri Jan 01 00:00:00 EST 2010}
}

Conference:
Other availability
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