LHC IR System Cryogenics, Heat Loads, and Temperatures

Input data and background information

• Nikolai Mokhov's triplet heat for 3 radial layers (beam tube, coil, and other) -- EPS file, 6 June 2000
• Nikolai Mokhov's triplet heat totals --(Excel file) 20 June 2000 numbers in Tom Nicol's format
• Nikolai Mokhov's triplet heat totals --(Excel file) Tom Nicol's transcription to Excel of N. Mokhov's March 2000 results
• http://home.cern.ch/~vanweeld/heatload/hlmagnets.html --Rob Van Weelderen's heat load spreadsheet
• IR quad cryostat --Tom Nicol's IR quad cryostat index page with links to design review info including heat load tables and pipe size tables
• DFBX Functional Spec --(PDF file) Jon Zbasnik's DFBX Functional Specification including heat load estimates for the DFBX's

• IP1 (HPGL file)
• IP2 (HPGL file)
• IP5 (HPGL file)
• IP8 (HPGL file)

Inner Triplet Heat Exchanger Test (IT-HXTU)

• Christine Darve's IT-HXTU page
• Rob Van Weelderen's IT-HXTU page
• Comparison of IT-HXTU data to analytical predictions -- (MS Word file, Tom Peterson, analysis of delta-T's in the HXTU)
• hxtuHeatAnal.xls -- (MS Excel) Spreadsheet analogous to the QuadHeatAnal spreadsheet but containing HXTU geometry and provisions for inputting the four heater powers

IR system thermal analyses and results (updated March, 2002)

• IR Heat Load Summary Table -- New (MS Excel, 31 Jan 01) Table of heat loads and flows for standby, nominal, and ultimate luminosity
• Annular space heat flow analysis -- (MS Word, 29 Mar 01) Document describing the analysis of heat flow from the inner coil surface through the annular space around the beam tube to the collar pole tips.  The issue is the effect of ground wrap insulation partially blocking the heat flow path.
• QuadHeatAnal.xls --(Excel, 5 Mar 02) Spreadsheet analyzing delta-T's from the iron yoke holes in the quads through the interconnect and also calculating the corrugated tube pressure drop.  Sheets include a table of Nikolai Mokhov's March 2000 heat input results (his data pasted from an e-mail), bar charts of heat input to the triplet, bar charts of delta-T's, temperatures from magnet to cold compressors.
• Q2HeatAnal.xls --(Excel,  7 Mar 02) Spreadsheet similar to above but saved with Q2b dimensions and heat analysis, for finding peak Q2 temperature
• Heat Load and Temperature Summary for the IR Inner Triplet --(MS Word, 8 Mar 02) The Heat Load Summary Table, QuadHeatAnal.xls spreadsheets, and beam tube annular space heat flow analysis provide input to this MS Word document summarizing delta-T's and estimating peak temperature in the MQX quads.  Pole tip gap and yoke hole size analyses are also included in this large document.
• IRheatPipeSizes --(MS Word, 9 Dec 99) Summary of the implications for these heat loads on cryostat pipe sizes which includes a cartoon of the inner triplet heat exchanger arrangement
• JTheatExch --(MS Word, 25 Feb 00) Summary of an analysis of the JT heat exchanger in the Heat Exchanger Test feedbox
• He II Heat Transfer through a Corrugated Tube - Test report --(PDF format) A paper about the first short piece of our 9 cm diameter corrugated pipe tested, providing the Kapitza conductance used in the delta-T analysis
• US-LHCtalk20Jan00.ppt --Download a PowerPoint file about the US LHC project with emphasis on cryogenics
• HGQ08 Thermal Studies --(MS Word) Paper presented at ASC 2000 by a large Techincal Division collaboration entitled "Thermal Studies of a High Gradient Quadrupole Magnet Cooled with Pressurized, Stagnant Superfluid.”