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Title: D0 Cryogenic In-Line Filters

Abstract

The DO cryogenic system utilizes liquid argon (serving as the detector ionizing medium) and liquid nitrogen (refrigerant for the argon). In order to keep these fluids pure and minimize the likelihood of plugged instrumentation due to contamination, in-line filters will be installed on the following lines (see Cryogenic Flow Diagram, drawing 3740-ME-222394): 445LN, 412LN, 447LA, 427LA. and 422GA. The lines referred to by these labels are argon dewar LN2 supply, cryostat LN2 supply, LAr dewar fill/drain line, cryostat LAr fill/drain line, and dewar-to-cryostat argon gas line, respectively. Five filters are required. As of this writing, one has been built and tested. The others are to be identical in concept and construction.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1031161
Report Number(s):
FERMILAB-D0-EN-188
TRN: US201201%%656
DOE Contract Number:
AC02-07CH11359
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ARGON; AVAILABILITY; CONSTRUCTION; CONTAMINATION; CRYOGENICS; CRYOSTATS; DEWARS; NITROGEN; Experiment-HEP

Citation Formats

Fuerst, J.D., and /Fermilab. D0 Cryogenic In-Line Filters. United States: N. p., 1988. Web. doi:10.2172/1031161.
Fuerst, J.D., & /Fermilab. D0 Cryogenic In-Line Filters. United States. doi:10.2172/1031161.
Fuerst, J.D., and /Fermilab. Tue . "D0 Cryogenic In-Line Filters". United States. doi:10.2172/1031161. https://www.osti.gov/servlets/purl/1031161.
@article{osti_1031161,
title = {D0 Cryogenic In-Line Filters},
author = {Fuerst, J.D. and /Fermilab},
abstractNote = {The DO cryogenic system utilizes liquid argon (serving as the detector ionizing medium) and liquid nitrogen (refrigerant for the argon). In order to keep these fluids pure and minimize the likelihood of plugged instrumentation due to contamination, in-line filters will be installed on the following lines (see Cryogenic Flow Diagram, drawing 3740-ME-222394): 445LN, 412LN, 447LA, 427LA. and 422GA. The lines referred to by these labels are argon dewar LN2 supply, cryostat LN2 supply, LAr dewar fill/drain line, cryostat LAr fill/drain line, and dewar-to-cryostat argon gas line, respectively. Five filters are required. As of this writing, one has been built and tested. The others are to be identical in concept and construction.},
doi = {10.2172/1031161},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 04 00:00:00 EDT 1988},
month = {Tue Oct 04 00:00:00 EDT 1988}
}

Technical Report:

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  • This engineering note documents the proposed cryogenic line routing from the liquid helium (LHe) refrigeration plant to the detector solenoid and VLPC cryostats. Many figures are included to aid in understanding the route. As an appendix, I include some general comments relevant to the topic. Also listed are a number of routing options that were considered before the proposed route was finalized.
  • The cryogenic lines GHE and LN2 contain two lines each, one for supply and the other for return. The tubing was stress analyzed per ASME code for pressure piping, standard ANSI/ASME B31.3. A commercial pipe stress analysis and design system by ALGOR{reg_sign} was used for the analysis along with the calculated maximum stress, 25,050 psi. They were all analyzed for combined pressure, thermal movement, and dead weight and all the stresses were below this allowable stress limit. There are sections of the transfer lines that will be increased from a 1-1/2-inch vacuum jacket to a 2-inch vacuum jacket. This increasemore » accounts for the maximum displacement, 0.466-inch in troubled areas as seen in subsequent drawings. The greatest displacement allowed for a 1-1/2-inch vacuum jacket is 0.421-inch for a 1/2-inch pipe on the nominal centerline. The greatest displacement allowed for a 2-inch vacuum jacket is 0.658-inch. We will have a clearance of 0.192-inch when using the 2-inch vacuum jacket.« less
  • The stresses developed in the solenoid and VLPC transfer lines have been investigated with the PipePlus v4.5 software package from Algor. 4 cases were considered for each transfer line and the following results were obtained. Pipe deflections have also been kept to a minimum by carefully considering the location of spider guides. Their placement should be as close as possible to the locations shown in Figures 4-7. With regard to chosen pipe sizes, the 2.5-inch OD Cu radiation shield in the solenoid transfer line should be replaced with a 3.5-inch OD tube. The vacuum jackets should also be replaced withmore » 5-inch or larger pipe. These changes should safely accommodate the maximum displacements caused by thermal loading. This engineering note investigates the ability of the solenoid and VLPC cryogenic transfer lines to accommodate thermal stresses. The solenoid and VLPC transfer lines are similar in their construction in that they consist of an outer vacuum jacket, liquid nitrogen supply and return lines, a copper thermal radiation shield, and liquid helium supply and return lines. See Figure 1 for details on their specific construction. Line drawings for the solenoid and VLPC transfer lines are shown in Figures 2 and 3, respectively. The transfer line system, as a whole, does not lend itself to simple analysis such as the 'Simplified Method for Flexibility Analysis' or the chart method. These methods demand that the piping system be rigidly anchored at two ends with no intermediate branches. Therefore, a major part of the analysis was performed on the PipePlus v4.5 software package by Algor. Considerations have been given to dead weight, pressure, and thermal loads, boundary conditions such as end displacements, and restraints caused by intermediate supports. The Appendices contain selected information from the PipePlus analysis. Only the pipe geometry, boundary conditions, loading, node displacements and stresses have been reported. The electronic version of the PipePlus databases are stored on the DMACS NT Fileserver under the 'Pipe' directory. These databases can be used to generate the complete reports.« less
  • The superconducting Tevatron was added to Fermilab's 400 Gev Proton Accelerator, the main ring, in 1983. An antiproton source was added in 1985, and the system became a p-pbar, 1 Tev/I Tev, collider in 1987. A CoIIider Detector surrounding one of the points of the accelerator p-pbar beam crossings can measure virtually all the energy of the colliding interaction (Fig. I.) The measurement of all the energy is called hermetic calorimetry. Although there are other liquid argon calorimeters and other hermetic coIIider detectors, the D-Zero (named for the accelerator beam crossing location) liquid argon collider calorimeters will be the firstmore » of their kind (Fig. 2). The cryogenic aspects of the liquid argon calorimeter portion of the D-Zero detector are described here. The liquid argon serves as the particle detector ionizing media in a repetitive cell structure (Fig. 3) of argon, signal board, argon, and Uranium or copper absorber plate, with a superimposed electric field. Local signal board pads indicate location and the electric charge collected is proportional to the ionization and the ratio of the argon to plate absorption lengths. This arrangement provides a dense, intrinsically calibrated, drift-free calorimeter.« less
  • D0 is a collider detector. It will be operating and doing physics at the same time as CDP, therefore it has been decided to train CDP operators to operate and respond to the D0 cryogenic control system. A cryogenic operator will be required to be in residence at D0, during the cooldown and liquid Argon fill of any of the calorimeters. The cryogenic system at D0 is designed to be unmanned during steady state operation. CDP operations has 2 man cryogenic shifts 24 hours a day. It is intended that CDP operators monitor the D0 cryogenic systems, evaluate and respondmore » to alarms, and notify a D0 cryo expert in the event of an unusual problem. A D0 cryogenic system view node has been installed at CDP to help facilitate these goals. It should be noted that even though the CDP view node is a fully operational node it is intended that it be more of an information node and is therefore password protected. The D0 cryo experts may reassess the use of the CDP node at a later date based on experience and operating needs. This engineering note outlines the format of the training and testing given to the CDP operators to make them qualified D0 operators.« less