SSR1 Summary Harry Carter & Tom Peterson 19 November 2010

IIFC 325MHz SPMs and POCs SSR1 Cavity T. Nicol R. Patel P. Prakash SSR1 CM T. Nicol T. Nicol TBD RF Power R. PasquinelliR. Pasquinelli V. K. Handu VTS J. Ozelis J. Ozelis S. Joshi HTS A. Hocker A. Hocker P. Kush Instrumentation M. Wendt M. Wendt C. K. Pithawa & Controls Task Fermilab Sub- Fermilab India Inst. Project Manager POC POC

SSR1 Status in India SSR1 at IUAC in final assembly steps; now expected at FNAL May 2011 (per J. Kerby’s Group A Summary two weeks ago) –Vendor summer period to be accounted for in future planning –Better status communication needed IUAC has asked VECC to build the stainless steel helium vessel for their first two SSR1 resonators. P.K. Prakash is the project physist for the IUAC effort. Jayanta Chaudhuri is the lead VECC engineer. –The first two SSR1 assemblies are expected to be completed and delivered to Fermilab by May 2011 –IUAC intends to construct four more SSR1 resonators in the coming two years. There is no spoke resonator effort at RRCAT at this time, and to my knowledge, none is planned in the future.

Single Spoke Resonator - SSR1 (P.K. Prakash) ~  500 mm Single Spoke Resonator SSR1 G2 (niobium portion) -  = 0.22, f = 325 MHz Shell & Coupler Ports Spoke with Beam Port & Collars End Wall with Beam Port, Daisy Ribs & Donut Rib

SSR1 – Shell (P.K. Prakash) Rolled ShellsMachining Fixture EBW FixtureEBW setup EBW (face) EBW (root)

SSR1 – Spoke (P.K. Prakash) Forming After first stage of forming After second stage of forming After trimmingEBW setupSpoke – Post EBW

SSR1 – End Wall (P.K. Prakash) Die setting upForming – 1 st stage End Wall after the 2 nd stage forming Forming after final stageTrimmingEnd Wall - Final

SSR1 – Other Items (P.K. Prakash) Coupler Port PulloutTrial Niobium Coupler Port Pullout Nb Shell with Coupler Port Pullouts Nb Donut Rib Die for Spoke to Shell Collar Nb-SS Brazed Flange Assembly (L), End Wall Beam Port (R) in SS

Developmental Efforts (P.K. Prakash) Niobium material contingency Forming of Half Spokes Forming of End Walls No margin for error! Several trials required with Cu material A forming trial was made on the Half Spoke using IUAC niobium Design change to SSR1 G2 Vertical access for tacking Brazed Flange assembly from outside not possible Tilt and tack from outside? Welding from inside Fixturing becomes more involved for beam welding. It may not be an issue in large EBW chambers

Delivery Schedule (P.K. Prakash)

SSR1 Status at Fermilab SSR1 prototype completed and successfully tested in FY10 Ten spoke resonators have been ordered and are due to be delivered in Summer 2011 –Roark/Niowave is the manufacturer A generation 3 design for SSR1 is under development. It will improve the df/dP performance of the cavity A three cavity SSR1 prototype cryomodule is also under development. It will be very useful to establish CM requirements for the SSR0-SSR2 production CMs.

SSRx Mech. Design Reqmts. (Foley, et. al.) SSR0/SSR1/SSR2 MAWP: 2.0 bar warm, 2.5 bar cold. –Von Mises equivalent stresses in Nb ≤ 50 MPa Max microphonics amplitude: 30 Hz [SSR2: 20 Hz] –Pressure fluctuations expected: ± 0.1 torr –Contribution of P to df: 50% –df/dp ≤ 75 [50] Hz/torr (30 Hz [20]* 0.5 / 0.2 torr) The stated material thickness for all of the following analysis results is the nominal (as ordered) thickness. For all analyses the material thickness was reduced by 0.3 mm to account for forming and post-processing. A Functional Requirements Specification needs to be developed for all SSRx cavities.

First jacketed prototype with two slow/fast tuning mechanisms System of ribs designed originally for LFD compensation in pulsed machine SSR1 experience from HINS R&D Gen 1 & 2

Mechanical design of SSR1 G3 work in progress Max Von Mises at 2.0 bar=68 MPa Collapse at 5.7 bar 0.57 * 10 bar = 5.7 bar > 2.4 * 2.0 bar

Few iterations in concepts of cavity / solenoid designs to minimize period (690  605 mm) In lattice was used: L p =610 mm Mechanical design: minimizing of df/dP RF coupler & tuner design is in progress Preliminary SSR0 Design (B. Weber)

3-Cavity Cryomodule Assembly (B. Weber) Current leads Heat exchanger Check valve Input couplers Control valves and bayonets

3-Cavity Cryomodule Assembly (B. Weber) Vacuum vessel, magnetic and thermal shields removed

Summary Tom and I had several discussions with Prakash regarding the SSR1 while at RRCAT on Oct In general: –Communications between all parties are good. The addition of Ronak Patel as POC has been instrumental. –Functional Requirements Specifications need to be created for SSR1 as well as the other planned SSRx cavities Status of IUAC work: –All niobium parts for the first two spoke resonators have been fabricated and await EBW at IUAC –IUAC plans to deliver the two SSR1 cavity assemblies to Fermilab in May 2011 –IUAC plans to build an additional four SSR1s over the next two years IUAC has an agreement with VECC regarding the production of the helium vessel components. –Issue of who provides stainless materials came up---IUAC does not plan to provide them and expects VECC to do so.

Summary (Cont.) Prakash provided us with a list of questions and drawing requests from the VECC head engineer (J. Chaudhuri) –Since returning from India, I have met with Leonardo and Ronak to discuss the questions and drawings requests and all initially requested information has been provided to VECC. Additional questions have arisen which have also been answered. Fermilab effort: –SSR1 was completed and successfully tested in FY10 –Ten more SSR1 resonators are planned for construction. They have been ordered from Roark/Niowave. Two are scheduled for completion by the end of this calendar year; the remaining 8 by Summer 2011 –An SSR1 generation 3 design is under development. It will improve the df/dP performance from the generation 1 & 2 designs. –Design work is underway on SSR0 –A three-SSR1 cavity cryomodule design is also underway.