TY - JOUR
T1 - 2-K pump down studies at SNS
AU - Howell, M.
AU - Casagrande, F.
AU - DeGraff, B.
AU - Ganni, V.
AU - Kim, S. H.
AU - Knudsen, P.
AU - Martinez, M.
AU - Morris, B.
AU - Neustadt, T.
AU - Norton, R.
AU - Scanlon, C.
AU - Strong, H.
AU - Vandygriff, D.
AU - Wilson, G.
PY - 2015/12/18
Y1 - 2015/12/18
N2 - The Spallation Neutron Source (SNS) linear accelerator (LINAC) consists of 81 superconducting radio frequency (SRF) cavities cooled to 2.1 K by a cryogenic refrigeration system. The 2-K cold box consists of four stages of cold compressors with liquid nitrogen cooled variable speed motors. Transitioning from 4.5-K operation to 2.1-K operation in the cryomodules involves pumping the cryomodules down from approximately 1 bar to 0.040 bar. This effort is conducted through the use of several sequences developed as a collaborative effort between Thomas Jefferson National Accelerator Facility (TJNAF) and SNS personnel during the original commissioning of the SNS cryogenic system. Over the last ten years, multiple lessons have been learned about VFD behavior, thermal stability, procedural development and refining the sequences. From 2012 to 2014, there were multiple pump down iterations that were not successful. Studies have been conducted to determine the cause of these unsuccessful iterations. The results of these studies including components replaced and aspects that have not yet been solved are presented in this paper. Future plans to refine the sequence and determine the cause of unsuccessful pump downs will also be presented.
AB - The Spallation Neutron Source (SNS) linear accelerator (LINAC) consists of 81 superconducting radio frequency (SRF) cavities cooled to 2.1 K by a cryogenic refrigeration system. The 2-K cold box consists of four stages of cold compressors with liquid nitrogen cooled variable speed motors. Transitioning from 4.5-K operation to 2.1-K operation in the cryomodules involves pumping the cryomodules down from approximately 1 bar to 0.040 bar. This effort is conducted through the use of several sequences developed as a collaborative effort between Thomas Jefferson National Accelerator Facility (TJNAF) and SNS personnel during the original commissioning of the SNS cryogenic system. Over the last ten years, multiple lessons have been learned about VFD behavior, thermal stability, procedural development and refining the sequences. From 2012 to 2014, there were multiple pump down iterations that were not successful. Studies have been conducted to determine the cause of these unsuccessful iterations. The results of these studies including components replaced and aspects that have not yet been solved are presented in this paper. Future plans to refine the sequence and determine the cause of unsuccessful pump downs will also be presented.
UR - http://www.scopus.com/inward/record.url?scp=84959865905&partnerID=8YFLogxK
U2 - 10.1088/1757-899X/101/1/012128
DO - 10.1088/1757-899X/101/1/012128
M3 - Conference article
AN - SCOPUS:84959865905
SN - 1757-8981
VL - 101
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
IS - 1
M1 - 012128
T2 - 2015 Joint Cryogenic Engineering and International Cryogenic Materials Conferences, CEC/ICMC 2015
Y2 - 28 June 2015 through 2 July 2015
ER -