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ILC SCRF Test Facilities

Sergei Nagaitsev Fermilab. ILC SCRF Test Facilities . This talk describes:. ILCTA test facilities @ FNAL (in collaboration with many institutions) Vertical and Horizontal test of Cavities: Determine the maximum operating gradient of each cavity

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ILC SCRF Test Facilities

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  1. Sergei Nagaitsev Fermilab ILC SCRF Test Facilities

  2. This talk describes: ILCTA test facilities @ FNAL (in collaboration with many institutions) • Vertical and Horizontal test of Cavities: • Determine the maximum operating gradient of each cavity • Evaluate gradient spread, Q0 and their operational implications. • Measure dark currents, cryogenic loads, and radiation levels. • Test of Cryomodules: • Measure gradient of cavities in cryomodules • Measure vibration of components, system trip rates & recovery times • Beam Based Measurements: • Beam energy, stability, & energy spread • Wakefield measurements, HOM based alignment & LLRF issues • Goal: Are the cryomodules “good enough” for the ILC ? Not described: RF Activities @ SLAC & FNAL (in collaboration with many institutions) • Develop high power RF components for Main Linac • Development of LLRF and multi-cavity control systems • RF systems in support of ILCTA @ FNAL DOE review

  3. Vertical Test Stand • Our goal is to rapidly advance the intellectual understanding of SCRF surface physics and establish process controls to reliably achieve high gradient ( 35 MV/M) SCRF cavity operation • Approach: Establish a “tight loop” processing and test infrastructure in the U.S. • Tight loop elements: • Cavity fabrication improvements ( e.g. single crystal) • BCP & Electro-polish facilities • High purity water and High pressure rinse • Vertical test facilities • SCRF experts & materials program to interpret results • Vertical test facilities exist at Cornell and TJNL (bare cavities) • These are being modified for near-term use by ILC R&D • On a longer term ( 2007) new Vertical Test Stand (designed for 35 MV/M) cavity testing is being built at FNAL DOE review

  4. ILCTA_VTS • A Vertical Test Stand VTS is sited in IB1 because this building currently houses the Magnet Test Facility  large refrigerator capable of 60 W at 1.8 K • Bare 1.3 GHz 9-cell Tesla-style cavities • Measure Q vs. T and Q vs. Eacc • 250 W (CW) RF power required at maximum gradient (Q=5x109, Eacc=35 MV/m) • Installed in a vertical pit in the Floor • Shielding against X-rays and Neutrons is an important issue for 35 MV/M cavities • Maintain “Controlled Area” status in IB1 • <5 mrem/hr immediately outside shielding • <0.25 mrem/hr in normal working areas LHe & vacuum lines Industrial Building 1 Cornell DOE review

  5. VTS Status & Plans • Cryostat Design • Added phase separator to DESY design to improve He Quality • Estimated RF duty factor possible based on IB1 cryogenic capacity • Started cryogenics controls modifications • Cryostat design in progress • Radiation Shielding • Estimated x-ray flux from DESY data • Finalizing shielding design; prerequiste for finalized civil construction design • Secure OK from Safety, then proceed with Civil work ~ 2 months • RF & instrumentation • Instrumentation design has begun • Rack layout, etc • Input coupler design will start soon • On track to have a Vertical Test System to test high gradient cavities at Fermilab in 2007 VTS Civil Design One or two 9 cell cavities DOE review

  6. Horizontal Test Facility • Purpose: Verify dressed cavity performance (Eacc vs. Q0) to qualify cavities for assembly into a cryomodule • Bare cavities that pass vertical test are “dressed” with LHe cryostat, coupler, & tuner then tested with RF pulsed power • Usually referred to as “Horizontal Test” since this test is performed in this orientation at DESY in the Chechia facility • Horizontal Test Systems (HTS) are under design for ILCTA_MDB (Meson Detector Building) and ILCTA_IB1 (Industrial Bldg 1) Bare 1.3 Ghz 9 cell Cavity Horizontal Test@DESY 4 cavities received from ACCEL 4 cavities on order at AES 2 cavities on order at TJNL 4 cavities expected from KEK Dressed Cavity DOE review

  7. HTS ILCTA_MDB HTS • Cryostat: • Accepts single “dressed” cavities, 1.3 GHz or 3.9 GHz • Similar to the DESY HTS but has access at both ends. • Cryogenics: • MDB has an existing 1800 W @ 4 K cryogenic system • New distribution system built to supply cavity test areas • Large vacuum pump has been added to achieve 60 W at 1.8 K • RF System: • 200 KW klystron & modulator provides pulsed RF power ILCTA_IB1 HTS • A second HTS will be built for IB1 • Improved throughput (HTS is bottleneck @ DESY) • Design improvements • Accepts two 1.3GHz cavities simultaneously. DOE review

  8. HTS Status & Plans • ILCTA_MDB • Phase I: Qualify six 3.9 GHz cavities for DESY TTF-VUV-FEL • Phase II: Qualification and R&D for 1.3 GHz cavities for ILC • Cryostat being fabricated at PHPK (Columbus, OH) • Delivery: end of May-2006 • Cryo lines to cave installed, interface to cryostat (feed can) under construction • Working 1.3 GHz RF system in MDB • Operated daily (Capture Cavity 2 testing) • Gathering components for 3.9 GHz DOE review

  9. Schedule • Delivery of MDB cryostat in May-06 • Connect to MDB cryo system and commission • RF commissioning in parallel • Ready for 3.9 GHz cavity testing by end June • FY07: Construction of 2nd HTS in IB1 • Exploits existing facility to increase cavity throughput • Allows LLRF R&D on driving multiple cavities w/ one klystron DOE review

  10. MDB Transfer Lines & feed cans This feed can was designed at SLAC and built at FNAL DOE review

  11. Capture Cavity 2 Capture Cavity 2 is a high gradient superconducting cavity destined to upgrade the A0 PhotoInjector to 40 MeV. This opportunity has been used for FNAL to learn the intricacies of SCRF work as well as to test FNAL facilities. It is a collaborative effort: • Tesla 9-Cell 1.3 GHz Cavity (AC68): DESY (33MV/m) • Slow Tuner: Saclay & FNAL • Old Cavity (in cryo vessel): Saclay • Cryo Vessel: IPN Orsay • LLRF: DESY & FNAL (SNS) • Groups within FNAL: AD, TD, CD 4.5 K Operation & Testing • Peak Gradient • LLRF testing • Piezo Fast Tuner Testing • Cavity vibration DOE review

  12. Capture Cavity II Cold & RF power First 1.3 GHz TESLA Cavity in MDB Cold and RF power MDB Cryogenics 60 W @ 1.8 K Klystron 200 KW DOE review

  13. RF In CC2: Peak Gradient Driving with a 1.38mSec (~100kW) square RF pulse: “Full Blast” Q-loaded: 4.28E6 BLU = P-forward YEL = P-reflected RED = P-trans = gradient ~ 27.5MV/m (any higher in gradient and cavity displays quenching) When compared with critical field (temp) plot, this suggests quenching at 1.8K at 33MV/m. DOE review

  14. ILCTA_NM @ Fermilab New Muon Lab FNPL Photo-injector 11/05 Building a ILC cryomodule test area in the New Muon Lab (ILCTA_NM) • Cleaning out building (Done) except for CCM • Preparing to remove CCM • Plan to move Photo-injector • Work is in progress to install interim cryogenic solution in FY06 • Will build part of the cryogenic distribution system in FY06 • Funding  Can not start Cryomodule feed cans until FY07 DOE review

  15. ILCTA_NM schematic round to flat beam transformation (will be 3) DOE review

  16. ILCTA: ILC RF unit at Fermilab 08 09 07 Plan is to build one RF unit to be tested with Beam by 2009. 06 07-08 DOE review

  17. DOE review

  18. NML Heat xchanger & LN2 Dewar A satellite refrigerator installed. Need one more to run 3 cryomodules at 5 Hz DOE review

  19. DOE review

  20. DOE review

  21. Cryomodule end cans Delayed to FY07 ($$) Cryomodule Test at DESY TTF End Cans DOE review

  22. Summary ILCTA_NM: • Installing Cryogenics, vacuum pump, plumbing, electrical infrastructure, laser room, controls, etc • Plan to move FNPL photo-injector to New Muon in 07 • Will provide ILC like beam to test cryomodules • Building transfer lines, feed cans, etc. • FY06: Funded from Fermilab “SCRF infrastructure” from “core” program funds at FNAL  ie not via GDE • FY06 progress is limited by available cash • Needs serious funding in FY07 • Will provide test of 1st U.S. built Cryomodule in 2007 DOE review

  23. Systems Tests • It is Fermilab’s opinion that a significant systems test will be required in advance of ILC construction to verify: • Technical performance of critical/cost driving components • Systems integration • Vendor performance • Reliability of cost estimate • Should include ~1% of final cryomodule count, produced by vendors in a pre-production run • Plan is to assemble into ~ 5 GeV electron linac • Mount in a near surface twin tunnel ILC mock up • Could include a demonstration damping ring in Tev Tunnel • We propose to host this facility at Fermilab • Believe the correct approach is to develop requirements first, then evaluate possible facilities. • Discussion with the GDE are in progress DOE review

  24. Conclusions • Our prime objective is to build and evaluate the components of the ILC main Linac • Also we need to acquire experience & expertise in the U.S. on SCRF technology • We are building extensive infrastructure at Fermilab and SLAC in support of these goals • Cavity test facilities ( horizontal and vertical) • High Power RF test systems • LLRF test systems • Cryomodule Test facilities ( including beam tests ) • Significant Technical Progress in FY0506 • Progress is limited by the available funding DOE review

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