TESLA Cryomodules

TESLA Cryomodules T. Nicol – Fermilab T. Page – Fermilab J. Weisend II – SLAC C. Pagani – INFN / Milan tnicol@fnal.gov http://tdpc02.fnal.gov/nicol/tesla/index.html http://tdpc02.fnal.gov/nicol/photos/hardware/index.html

TESLA cryostats, couplers, etc. at Fermilab… • Began attending collaboration meetings in 1992. • First hardware was a HPP (High Power Processing) vertical test dewar for installation at Cornell in 1992. • Two vertical dewars for HPP processing at DESY shipped in 1993 and 1994 and installed in Hall 3. • TTF feedbox designed and built in TD lead by Tom Peterson. • TTF warm-up heater designed and built by BD lead by Ron Walker. • Support posts designed, fabricated, and tested for the first TTF cryomodules. Drawings provided for subsequent fabrication at INFN. • Design and analysis support for baseline and alternate TTF cryostats. • Several years of coupler design development lead by Mark Champion with support from TD / E&FD Engineering Lab. TESLA Study Group - Cryomodules

Vertical test dewars for HPP… TESLA Study Group - Cryomodules

Support posts… TESLA Study Group - Cryomodules

Coupler development… TESLA Study Group - Cryomodules

Early cryostat concepts from DESY… TESLA Study Group - Cryomodules

TTF cryomodule #1… TESLA Study Group - Cryomodules

TTF cryomodules #2 and #3… TESLA Study Group - Cryomodules

TTF cryomodules #4 through #8… TESLA Study Group - Cryomodules

Alternate cryostat designs… TESLA Study Group - Cryomodules

Production cryomodule main features… • Based on 3rd generation TTF cryomodule design, but ~17 m as opposed to 12 m. • 38 inch OD carbon steel vacuum vessel. • Two thermal shields operating at 5-8 K and 40-80 K. • MLI on both shields, the cavity helium vessels, and the gas return pipe. • Twelve 9-cell cavities, quadrupole, steering dipole, BPM. • Magnetic shielding is integral to the cavity helium vessel. • Cryogenic piping is integral to the cryomodule vessel. TESLA Study Group - Cryomodules

Production cryomodule configurations… • 1004 standard linac modules with 12 cavities (15.927 m long). • 742 standard linac modules with an additional quadrupole and corrector coil package (16.728 m long). • 27 cryomodules with 8 cavities and one quadrupole package for the FEL injector and positron pre-accelerator. • 8 cryomodules with 4 cavities and 4 quadrupoles for the positron pre-accelerator. TESLA Study Group - Cryomodules

Production cryomodule conceptual layout… TESLA Study Group - Cryomodules

Production cryomodule heat load estimates… TESLA Study Group - Cryomodules

Production cryomodule quadrupole… TESLA Study Group - Cryomodules

Production cryomodule prototype… TESLA Study Group - Cryomodules

TDR Cost Estimate TESLA Study Group - Cryomodules

Cost exercise (very) preliminary results… TESLA Study Group - Cryomodules

Cost review write-up excerpts Cost Study The initial cost figures developed for the TESLA linac resulted from design and fabrication studies that were part of the industrial studies described above. The details of these cost studies are not widely known, but the results were used to produce the figures published in the Technical Design Report. In that report, the total cost of all the cryomodules for the 500-GeV linac is €1.13M or 34% of the total project cost. It’s not always clear exactly what things are and are not included in these costs, but some things are evident. Basically, the €1.13M figure is that which would be paid to whatever industrial company or companies were involved in fabricating completed modules in exchange for their delivery. It does not include R&D done by DESY or other collaborating laboratories prior to or during fabrication. It does not include any allowance for contingency, nor for lab overhead. It does not include any allowance for post-fabrication work at DESY, transport, installation, testing, etc. It is not clear whether it includes transportation to the project site itself. TESLA Study Group - Cryomodules

Cost review write-up excerpts Cost Study Within the details of the cost estimate itself, most of the “major” items associated with the cryomodules are included – e.g. vacuum vessel, shields, insulation, supports, tuners, couplers, helium vessels, piping, etc. What is less clear is the extent to which things liked instrumentation, valves, electronics, etc. are included. It doesn’t appear that any testing of completed modules at DESY is included either. TESLA Study Group - Cryomodules

Cost review write-up excerpts TESLA Study Group - Cryomodules

Cost review write-up supporting info TESLA Study Group - Cryomodules

Fast forward to March 2002… TESLA Study Group - Cryomodules

8 GeV SRF Injector Linac Design Study TESLA Study Group - Cryomodules

TESLA Cryomodules