Elliptical Cavity Cryomodules General layout and status Lund

Elliptical Cavity Cryomodules General layout and status Lund 09/01/2013 P. Bosland

General overview of the cryomodule ~ 5, 7 beta 6, 6 mm forthe themedium high beta • • 4 superconducting 5 cells cavities at 704, 42 MHz equipped with: Ø 1 power coupler per cavity – Pmax= 1, 2 MW – pulsed mode 4% DC Ø 1 piezo tuner Temperature of the cavities: 2 K (superfluid helium) Lund 09/01/2013 P. Bosland

General overview of the cryomodule Performance specifications for the cavities: Eacc VT (MV/m) Eacc Linac (MV/m) Qo @ nominal Eacc Medium beta 17 15 5 e 9 High beta 20 18 6 e 9 Static cryogenic loads for medium and high beta cryomodules 2. 1 K static heat load 5 K static load thermal shield static heat load Temperature of thermal shield Lund 09/01/2013 9, 2 W 6, 4 W 63 W 50 K P. Bosland

Organization between Orsay and Saclay for the ECCTD • • IPNO in charge of the cryostat – design and manufacturing Vacuum tank Space frame – cavity supports Thermal shield Multilayer insulation Cryogenic pipes Instrumentation Saclay in charge of cavity package, assembly and tests: Cavity + helium tank Power coupler design, manufacturing, RF tests Piezo tuner Magnetic shield Tooling: field flatness, cavity preparation, cryomodule assembling, … Cryomodule assembling RF power tests stand RF power tests of the prototype cryomodule Lund 09/01/2013 P. Bosland

High beta cavity package at CEA Saclay Design made by G. Devanz and J. Plouin Franck Peauger in charge of the work package since January 2013 1 piezo tuner Type Saclay V 5: HIPPI, SPL 1 cavity with its helium tank Lund 09/01/2013 1 power coupler (HIPPI power coupler) P. Bosland

The elliptical cavity With its helium tank 5 cells superconducting cavity made in niobium Sheet thickness: 4 mm (for high beta cavities) Stiffener rings HOM coupler port Suppressed on the high beta cavities Pickup port Helium tank made in titanium Sheet thickness: 5 mm Lund 09/01/2013 Power coupler port Guillaume Devanz + Juliette Plouin P. Bosland

The elliptical cavity With its helium tank 2 prototype cavities at beta = 0, 86 ordered b g=0. 86 Delivery planned in June 2013 Iris diameter: 120 mm Beam tube diameter: 140 mm L = 1316 mm Total weight: 89 kg Weight of niobium: 54 kg Lund 09/01/2013 unit Frequency 704. 42 MHz Nr of cells 5 (sym. ) Cell to cell coupling 1. 8 % p and 4 p/5 mode separation 1. 2 MHz Epk/Eacc 2. 2 Bpk/Eacc 4. 3 m. T/(MV/m) Max. r/Q 477 @ b=0. 92 W G 241 W Low field Qo 3 e 10 Heat load 4. 5 W @ 18 MV/m P. Bosland

The power coupler and the Saclay V 5 piezo tuner Two components developed and tested within the CARE HIPPI program G. Devanz CARE-HIPPI cavity Lund 09/01/2013 Piezo actuator 1 MW RF power coupler pair in the conditionning configuration P. Bosland

Work done at CEA-Saclay • Characterization of all components developped at Irfu/SACM in Cryholab • Tests of the LLRF measurement crate designed and built by CERN • Design, fabrication and test of the klystron 1 MW phase stabilization • Lorentz force compensation at Eacc 13 MV/m in mode pulsed mode (2 ms 50 Hz) • Contribution to the cavity model for Matlab simulations Test of the 1 MW power coupler on the cavity at 1. 8 K CTS linearity at 4 K Fully equipped cavity (magnetic shield is open) Full system installed in Cryholab Mesured transfer function of piezo to cavity dynamic detuning Mesured spectrum of mechanical vibrations due to Lorentz detuning (2 ms pulses) Piezo linearity at 1. 8 K Lund 09/01/2013 G. Devanz CEA/Saclay P. Bosland

Lorentz force comensation (Eacc = 13 MV/m) Compensation piezo OFF 45% cavity voltage drop during the flat top due to Lorentz detuning 50° variation during flat top Compensation piezo ON Amplitude excursion now reduced to 1. 4% and phase shift within ± 8 deg. ZOOM Regulation de phase du klystron Lund 09/01/2013 G. Devanz CEA/Saclay P. Bosland

The HIPPI power coupler modified for the ESS cavities to be finalized OK The antenna The double wall outer conductor Design interface coupler/vacuum tank OK The ceramic window The warm coaxial line Length of coaxial line to be adjusted Lund 09/01/2013 The door knob equipped with: • A biasing system for the antenna • A cooling circuit for the antenna Ø Water cooling Ø Or air cooling P. Bosland

The Saclay V 5 piezo tuner modified for the ESS cavities (Minor) Modifications to be done: • Piezo frame • Double lever arms • Interfaces with helium tank and cavity Lund 09/01/2013 P. Bosland

Until December 2012 We worked within the frame of the FR/SW agreement and its amendment for Project #8 CEA IPNO Project #1 : Injector reliability test Project #2 : 352 MHz power coupler bunker Project #3 : 8 equipped and tested SRF cavities Project #4 : contribution to the TDR Project #5 : engineering design effort Project #6 : (IPNO) Cryomodule spoke Project #7 : (IPNO) New infrastructure for SRF cavities CEA & IPNO Lund 09/01/2013 amendment New Project #8 : ECCTD P. Bosland

The amendment of the present agreement is not yet signed but the work began: • • • T 0 = 1 rst of April Manufacturing of the 2 prototype cavities at b=0, 86 (+ tooling) in progress in industry The engineering design of the ECCTD at IPNOrsay is based on high beta cavity at b=0, 86 Lund 09/01/2013 P. Bosland

Since January 2013: new priority on Medium beta ECCTD M-ECCTD • Medium beta cavity design to be finalized (Gabriele @ Saclay) • Niobium call for tender preparation is launched • Cavities call for tender to be launched before end of January • M-ECCTD and H-ECCTD: same design (only difference = length) • Perform assembly & test in the same facility at Saclay • Main objective : Test of M-ECCTD in October 2015 Lund 09/01/2013 P. Bosland

Planning for the MECCTD and HECCTD Lund 09/01/2013 P. Bosland

Conclusions 2 prototype cavities manufacturing in progress Vertical tests of the prototype cavities: July 2013 Cavity preparation tooling delivered Field flatness tooling delivered General design of the cryomodule completed. Cryogenic piping to be finalized ü Switch priority to M-ECCTD since January 2013 ü Procurement preparation for the niobium of the Medium beta cavities launched ü Design of the M beta cavity in progress ü ü ü Lund 09/01/2013 P. Bosland