Americas Fermilab Main Linac SRF R D Shekhar Mishra

Americas Fermilab Main Linac SRF R&D Shekhar Mishra Fermilab 9/25/06 TTC Meeting at KEK

Americas Goals The technical goals of the Main Linac SRF R&D are consistent with the ILCGDE’s priorities as being discussed by the S 0, S 1 and S 2 Task Forces and the regional priorities as established by the Ozaki committee. These goals are still being defined, but the current lists of goals include: • Develop cavity processing parameters for a reproducible cavity gradient of 35 MV/m; improve the yield of 9 -cell cavities for gradient of 35 MV/m in vertical tests (S 0. 1). Carry out parallel/coupled R&D on cavity material, fabrication, and processing to identify paths to success (S 0. 2). • Assemble and test one or more cryomodules with average gradient > 31. 5 MV/m (S 1). • Build and test one or more ILC rf units at ILC beam parameters, high gradient, and full pulse rep rate (S 2. 1). • Develop plans for an ILC Main Linac System Test consisting of several rf units (S 2. 2). • Strengthen U. S. SRF technical capabilities and prepare the U. S. with the infrastructure, expertise and industrial capabilities necessary to host the machine. 9/25/06 TTC Meeting at KEK 2

Americas 3 Major Areas of Work Scope • Support S 0, S 1 and S 2 goals (as discussed in GDE Task Forces) – Demonstrate ILC technology – Work with GDE, TTC and Regional Collaborations – Install sufficient infra-structure to support activities • Advance industrial capability for SRF in the US region to improve our readiness for ILC (as discussed in Regional Interest Panel) – US labs and industry need to gain command of main linac technology (core competency) – Industry and labs work closely together • Carry out key ACD R&D items (as outlined in the BCD) – A “forward looking” approach (Large Grain, Single Cell, New Shape) – Improve ILC performance, – reduce cost 9/25/06 TTC Meeting at KEK 3

ILC Cavity R&D Americas • In order to make timely progress on the ILC cavities gradient goal we have taken the approach that – Maximizes the utilization of existing SRF infrastructure – Developing Fermilab based expertise and infrastructure. 50 Cavities (by mid 07) ACCEL AES 9/25/06 TTC Meeting at KEK 4

Americas Cavity Fabrication • Fermilab has installed and commissioned a Eddy Current Scanner and a set of microscopes for QC of the Nb Sheets before cavity fabrication. (We are making this available of industry use in new phase of fabrication. ) • Bead pull system to measure and manual tuning of the cavity • Fermilab is in discussing fabrication of an automated cavity tuning with DESY. 9/25/06 TTC Meeting at KEK 5

Americas Cavity Fabrication • US has ordered (or will order soon) following cavities. – FY 05: 4 Cavities (ACCEL) (TESLA Length) – FY 06: • Phase 1: 4 Cavities (AES), 4 (Jlab) (TESLA Length) • Phase 2: 6 Cavities (AES), 9 (Qualified Vendor) (ILC Length) – FY 07: 24 Cavities will be ordered in next several weeks. (Last cavities to be delivered mid 07) • S 0 -1 (US Cavities) – 3 Cavities from ACCEL is already part of tight loop at Jlab – 3 Cavities from Qualified Vendor (FY 06 -P 2) will be part of tight loop at KEK/DESY • Rest will be part of first phase of cavity yield studies, Vendor development, S 0 -S 1 and S 2 etc. 9/25/06 TTC Meeting at KEK 6

Americas US Cavity Fabrication, Processing and Testing Road Map Cavity Fabrication By Industry Surface Processing @ Cornell Vertical Testing @ Cornell Surface Processing @ ANL/FNAL Vertical Testing @ FNAL Cavity Dressing & Horizontal Testing @ Fermilab 9/25/06 TTC Meeting at KEK Surface Processing @ Jlab Vertical Testing @ Jlab Exists Developing 7

Americas BCP and Vertical Test of ACCEL Cavity 50 + 60 mm BCP + 50 mm at ACCEL + HPR No Field emission, Q > 0. 4 x 1010, Eacc = 26 MV/m, No Heat treatment at 800 Deg C. Q Eacc (Mv/m) Vertical EP Results on 1. 3 GHz cavities are expected soon. 9/25/06 TTC Meeting at KEK 8

Americas EP and Vertical Testing at Jlab • Jlab has commissioned the EP, HPR, Bake and Vertical Testing for the 1. 3 GHz cavities. • Jlab will be the center of the S 0 -1 “Tight Loop” actives in USA. Preliminary Result Limited by input RF 9/25/06 TTC Meeting at KEK 9

Americas Surface Processing Facility Development at ANL/FNAL • Fermilab and Argonne are jointly building a surface processing facility for ILC Cavity R&D. • The facility will have capability to perform BCP, EP and HPR. • The BCP Facility is under final phase of construction and will be safety reviewed by Spring of 07. • Design of the EP facility is progressing with plans to be commission with 9 Cell 1. 3 GHz Cavities by the end of FY 07. 9/25/06 TTC Meeting at KEK 10

Americas EP R&D • We are developing a Single Cell EP R&D Program (IB 4 @ Fermilab) to test and develop EP Recipe. • The EP Working group-3 is discussing Single cell Cavity exchange between US/DESY/KEK to advance the EP R&D. 9/25/06 TTC Meeting at KEK 11

Americas HPR and Vertical Test at Fermilab • Fermilab in collaboration with MSU is developing a new HPR system. • FNAL Vertical Test Stand to be commissioned Summer 07. – – Civil Construction finishes Aug. 06 Cryostat has been ordered Changes to cryogenics in IB 1 building soon RF and controls being developed in collaboration with Jlab. • Present cryostat top plate can hold two ILC Cavities. • Plan underway to put 2 nd pit. This will share RF and controls. Civil Construction 8/06 9/25/06 TTC Meeting at KEK 12

Americas CCII: Cavity Testing Infrastructure RF Power for HTS Cryogenics for HTS ready at 2 K Cryogenics for HTS getting ready Capture Cavity TTC Meeting at KEK for 2 K 9/25/06 13

Americas CCII: LLRF Control of the cavity Transmitted Power Reflected Power Feed back Feed Forward Power The CC-II has been operated at ~31 MV/m. 9/25/06 TTC Meeting at KEK 14

Americas Horizontal Test Stand • Fermilab is in progress of building a Horizontal Test Stand for 1. 3 and 3. 9 GHz cavities. • All the hardware needed have been delivered and the system in being put together. • The cryogenic, RF Power, Controls have been debugged using CC-II. • HTS will be commissioned using a Dressed Cavity from DESY next month (Oct 06). International Collaboration DESY KEK Poland Fermilab SNS Cornell U Penn 9/25/06 TTC Meeting at KEK 15

Americas Cavity Dressing and Cryomodule Assembly Facility • Fermilab has finished the construction of the Cavity Dressing and Cryomodule Assembly Facility. • The design is based on input and recommendations from DESY. • Detailed development and check out of the tooling is in progress. • DESY is sending two dressed cavities to debug this facility. • We are awaiting the delivery of Cryomodule Kit from DESY. 9/25/06 TTC Meeting at KEK 16

Cryomodule Design and Fabrication Americas • ILC Cryomodule working group (Fermilab, INFN, DESY, KEK and CERN) is working towards a design of an ILC cryomodule. This design is expected to evolve. • The Goal is to design an improved ILC cryomodule (Type-IV) and build one at Fermilab by FY 08. – – – Dipole, Quad and BPM package at the center Tuner Design New Cryogenic Distribution Shorter cavity-to-cavity interconnect length (Improve packing factor) Simplify assembly procedure Increase diameter beyond X-FEL Review 2 -phase pipe size and effect of slope 9/25/06 TTC Meeting at KEK 17

Americas Cryomodule Fabrication Plans for an RF Unit Test at ILCTA@Fermilab Cryomodule 1 Dressed Cavity Provided By DESY Cryomodule 2 Standard Length Cavity Purchased By Fermilab Surface Processing At Cornell/Jlab Cold Mass By DESY/INFN Cryomodule Assembled at Fermilab Vertical Test At Cornell/Jlab Dressed and HT At Fermilab Cold Mass From Zanon By Fermilab/INFN March 07 9/25/06 Dec 07 TTC Meeting at KEK Cryomodule 3 ILC Length Cavity Purchased By Fermilab Surface Processing Cornell/Jlab/ANL Vertical Test Cornell/Jlab/FNAL Dressed and HT At Fermilab Cold Mass Type-IV From US Company By Fermilab Mid 08 18

Americas Goals for ILCTA@Fermilab • Demonstrate stable long-term high-gradient beam operation at ILC-like bunch parameters. • While operating at high gradient and ILC-like beam currents, demonstrate a LLRF controls system such that the beam energy and beam phase stability meet the ILC specs. • Evaluate effects of cavity gradient spreads, dark current, cryogenic load, radiation levels with beam operation. • Measure beam kicks due to couplers, cavity tilt, quad rotations + tilt errors characterize focusing properties of SCRF cavities. • Measure vibrations of cavities and quads. • Test beam diagnostics. 9/25/06 TTC Meeting at KEK 19

Three cryomodules (fits into NML) • Mid 2009 - 3 CM's, 750 Me. V, 40 k. W beam power • Minimal injector § § § # Electrons/bunch # bunches/train Bunch rep. rate Train rep. rate Ave. current 9/25/06 2× 1010 2820 3 MHz 5 Hz ~ 50 µA TTC Meeting at KEK 20

ILCTA @ Fermilab Phase 1: 1 RF Unit Americas Goal: S 0, S 1 and S 2 Fermilab Diagnostics New-injector Dump 25 Me. V ebeam SLAC Components provided by US and International Collaborators 1 st RF Unit Integrated by US Laboratories and Universities 2 nd RF Unit Produced and Integrated by ILC laboratories, Universities and Industries 9/25/06 TTC Meeting at KEK ILC LLRF, Control, Instrumentation, Feedback etc. ILC Institutions 21

Americas Summary • US ILC R&D Program development is focused to address the key R&D issues. • We have been successful in commissioning cavity processing and testing infrastructures at Jlab and Cornell. • Development of new ILC R&D infrastructure development has made significant progress in last two years. 9/25/06 TTC Meeting at KEK 22