Cryomodule Status and Plans for XFEL Cryomodule Summary

Cryomodule Status and Plans for X-FEL Cryomodule (Summary of DESY internal meeting November, 29 th) K. Zapfe, R. Brinkmann, H. Brueck, K. Jensch, R. Lange, L. Lilje, W. Maschmann, A. Matheisen, D. Noelle(temp. ), D. Proch (temp. ) H. Remde (temp. ) A. Schwarz (temp. ), D. Trines, H. Weise, B. Petersen

Overview • • • Technical Status X-FEL Module Modifications Time Schedule & ‚Production Schedule‘ Status of Magnets and Tuners Summary: Module Parts Overview

Cryomodule Status (TTF type. III) Modules No. 4 & 5 Operation in the TTF 2/VUV-FEL linac: • • • Assembly & alignment much easier Static heat loads as designed Main coupler positions after thermal cycle as designed Alignment after two thermal cycles as designed Eacc 25 MV/m at about 10**10 demonstrated ( most cavities close to 30 MV/m) Module 5 coupler 2

Cryomodule Status -> Measured static heat loads in line with the estimated theoretical values design value = 1. 5 * estimated value

Cryomodule Status 2 K Dynamic heat losses of module 4 & 5 (type III) : about 3 W at 25 MV/m each (5 Hz, 500/800µ s) 0. 38 W/cavity Most cavities can be operated at higher gradients ! corresponds to about 3 W each

X-FEL Cryomodule • TTF type III design baseline for X-FEL • 8 cavities, 1 magnet package Modifications: • • • smaller quadrupole, 2 K cooled, type. III support, position still in discussion with Carlo metal gaskets and/or welded connections different BPM length shall match the (lambda * N/2) condition ceramic HOM absorber between modules Piezo tuner larger diameter for shield helium process tubes (DN 80 for 40/80 K) Safe-guard design Still open question: design changes needed to reduce vibrations ? ? Still open question: design changes needed/possible for in-situ coupler heating ? ? industrialization

Time schedule for X-FEL Prototype Cryomodule: -> we need more tests and experience until end of 2006 at latest !!! -> we can not wait for several design decisions Order Type. III modules as fast as possible !!!!! ( incorporate as much X-FEL changes as possible)

Cryomodule Plans production No. (*) type required accelerating field assembly date comments material 6 TTF-III > 35 MV/m 8 / 2005 ACC 6 in VUVFEL complete 7 TTF-II 20 -25 MV/m 9/ 2005 VUV-FEL spare complete 8 TTF-III plus > 28 MV/m 2006 XFEL preparations VUV-FEL spare to be ordered 9 TTF-III plus > 28 MV/m 2006 XFEL preparations to b ordered 10 TTF-III plus ? ? MV/m 2007 FNAL To be ordered 11 XFELPrototype > 28 MV/m 2007 XFEL-prototype to be ordered (*) the production number does not necessarily define the order of assembly

Status of Cryomodule parts: Cavities: see Axels talk

CIEMAT has finished the TESLA type Cold Mass Aluminum Cylinder Connection plate side

TESLA type Cold Mass Iron yoke blocks Superconducting coil Aluminum Cylinder

TESLA type Cold Mass Coils and connection plate before it was assembled

Summary on TESLA Magnet Package • Magnet is finished now – Last electrical test running – Will be sent this week should arrive next week (#50) • • Warm and cold tests planed at DESY for December and January 05 Cryostat – design done by a Spanish firm (TTM) – Reviewed by CIEMAT 2 weeks ago, TTM will send drawings next week to DESY for a final review – Fabrication at TTM until end of January 05 – Two weeks for final assembly needed • • Complete Magnet Package could be at DESY end of February 05 SLAC asked for a TESLA Type Magnet – we only have one, need to discuss how to proceed here (also with CIEMAT) – SLAC wants to study movements of the field axis • Problem: no vacuum tank • support of magnet

Summary on Current Leads • Ciemat has no HTS material available, checking if they can get more The “ 6 in one” assembly not yet designed, only the solution we are presently testing could be made I’ve contacted Mark & Wedell, that produces CERN 60 A leads • • – – They are willing to give us one lead assembly (4 leads) out of the CERN production, but CERN has to agree No answer yet

Piezo Tuner setup II • • • Sensor-Actuator configuration To compensate for Lorentz force detuning during the 1 ms RF pulse Feed-Forward To counteract mechanical noise, “microphonics” Feed-Back

Drawing of current setup (H. -B. Peters)

New Saclay Tuner 2

New Saclay Tuner 3

Cryomodule Parts production No. (*) type Cavities Magnets Tuners Cold Mass Vacuum 6 TTF-III Rest ACCEL+ ZANON TTF+BPM Old+Piezo+ 2 Saclay II) On site 7 TTF-II Old BCP treated TTF+BPM old SStruct 8 TTF-III plus ZANON XFEL+BPM? Saclay II to be ordered 9 TTF-III plus ZANON XFEL+BPM? Saclay II to b ordered 10 TTF-III plus TESLA ? ? no BPM !!!!!!! ? ? ? To be ordered 11 XFELPrototype XFEL+BPM Saclay II to be ordered (*) the production number does not necessarily define the order of assembly