# Presentation: 647708

## HINS Front-End R&D---Status and Plans

**Bob Webber**
**Fermilab Accelerator Advisory Committee**
**August 7, 2007**
**Update of May 10****th**** – 12****th****, 2006 AAC Presentation**

## Talk Outline

**Preview of today’s message**
**Motivation and mission**
**Reminder of R&D objectives**
**Progress report **
- R&D facilities
- Accelerator components
**Schedule status and outlook**
**Conclusion**

## Today’s Message

**HINS R&D program is still alive**
**Progress continues to be made**
- 325 MHz klystron has been commissioned
- First room temperature spoke cavity will be tested with RF power this month
- First superconducting spoke cavity is fabricated and being prepared for vertical cryostat test
**Current status is generally 9-12 months behind schedule presented to the AAC 15 months ago in May 2006**
**Current level of manpower resources and anticipated ~$2M M&S budget in FY08 will lead to further delays **

## HINS Motivation and Mission

**Motivation – **
- To demonstrate key and un-tested technologies important to the low-energy front-end section of the proposed 8 GeV H- Linac
**Mission, unchanged from ~2 years ago – **
- To accomplish the R&D necessary to establish technical credibility and cost basis for the Linac front-end by ~2010

## HINS R&D Objectives

**Demonstrate high power RF distribution and 4.5 msec pulse operation of multiple cavities from a single klystron **
**Demonstrate performance of 325 MHz high power vector (IQM) modulators for amplitude and phase control of multiple cavities**
**Measure axially-symmetric beam performance with room-temperature crossbar spoke resonator cavities and SC solenoid focusing in the RT Linac**
**Demonstrate beam acceleration at energies above 10 MeV using superconducting spoke resonator RF structures**
**Demonstrate high-speed (nanosecond) beam chopping at 2.5 MeV**
**Demonstrate performance of this Linac design concept and the resulting beam quality to 60 MeV**
** **
**This all adds up to building a one-of-a-kind superconducting 60 MeV H- linac**

## HINS Floor Plan in Meson Detector Building 

**RF Component Test Facility**

**Ion Source and RFQ Area**

**Cavity Test Cave**

**60 MeV Linac Cave**

**Klystron and Modulator Area**

**Existing CC2 Cave**

**ILC HTC Cave**

**Since May 2006, Linac has been moved downstream to accommodate continued use of CC2 Cave**

## Layout Through One SSR β=.4 Cryostat

- Layout Through One SSR β=.4 Cryostat

**Ion Source**

**RFQ**

**MEBT**

**Room Temperature 16-Cavity, 16 SC Solenoid Section**

**One ****Β****=0.4 SSR 11-Cavity, 6-Solenoid Cryostat**

**Two ****Β****=0.2 SSR 9-Cavity, 9-Solenoid Cryostats**

**2.5 MeV**

**50 KeV**

**10 MeV**

**20 MeV**

**60 MeV**

**30 MeV**

## Klystron/Modulator Area shown May 2006

## 325 MHz 2.5MW Klystron shown May 2006

## Pulse Transformer shown May 2006

## Waveguide Circulator shown May 2006

## Waveguide Components shown May 2006

## Modulator and Pulse Transformer

**Modulator Signals at 5.6 KV into Resistive Load**
**February 2, 2007**

- Modulator Output Current 200A/div

- Bouncer Voltage

- Capacitor Bank Voltage at 5.6 KV

- Pulse Transformer Output Current 2A/div at 36A

## Klystron Success !

**From HINS logbook, Wednesday, April 4**

**Full peak klystron output power at 3.5 msec pulse was achieved the following day**

## Toshiba Reps at Klystron Turn-on

## 325 MHz RF Component Test Facility

- Now Operational and Being Used

## 325 MHz Cavity Test Cave

**First RT Cavity Ready for Test**

## Approval received July 27 for RF power testing of first room temperature cavity in test cave

Recently recovered from modulator charging supply problem, cavity test has begun this week

**Recently recovered from modulator charging supply problem, cavity test has begun this week**

- Approval to Commence Cavity Testing

## RT Linac Support Structures in Meson

## Ion Source, RFQ and Beyond

**Proton source has been operational in MS6 and currently is undergoing modifications to improve high voltage power system and voltage stand-off capability**
**MEBT chopper pulser prototyping is underway**
**MEBT buncher cavity design is complete and fabrication bids are coming in**
**RFQ delivery is now expected ~October 2007  **
**RT cavities #2-4 are being machined**
**RT SC solenoid+trim magnet design and prototyping is complete; ready for procurement**

## Superconducting Spoke Cavities

**First SC spoke cavity fabrication has been received from Zanon**
**Second cavity is currently in fabrication at Roark**

## Superconducting Spoke Cavities

**Test cryostat for full pulsed power testing**
- High fabrication bids prompted new direction in design
- Engineers were re-directed to fix LHC magnet failure
- Drawings for cryostat vacuum vessel are now complete
**Plans are proceeding for full voltage CW test of first spoke cavity in the recently commissioned ILC Vertical Test Stand **
- Mechanical components are designed and mostly on hand
- 1.3 GHz  325 MHz frequency converters are designed and being assembled to take full advantage of the existing VTS control and data acquisition systems
- 200 watt CW 325 MHz amplifier has been spec’d and requisitioned
**Cavity will be BCP’ed at Argonne ~ 2 weeks prior to test anticipated in October**

## Meson Schedule 2006(from 5/2006 updated 8/2007 and assuming present resources)

**Short “mock” Linac cave section available**
- May 2006 available, but nothing yet installed (no people)
**Klystron modulator completion **
- July 2006 first pulsed in February 2, 2007 (AD EE priorities)
**325 MHz RF power system commissioning**
- July 2006 completed April 4, 2007 (modulator delay)
**325 MHz component testing in RF test area**
- Starting August 2006 began in May 2007 (modulator delay)
**325 MHz RT cavity power testing**
- September 2006 began this week, August 2007 (rad safety issue)
**Superconducting cavity test cryostat installation**
- October 2006 sometime 2008 ($$$ and engineer reassignment)

## Meson Schedule 2007(from 5/2006 updated 8/2007 and assuming present resources)

**Ion Source installation in Meson**
- November 2006 October 2007 (RFQ delays)
**RFQ delivery and power testing**
- January 2007 delivery expected ~October 2007 (vendor delays)
**2.5 MeV beam tests**
- Beginning February 2007 by end of 2007 (RFQ and manpower)
**First SC spoke resonator power tests in test cryostat**
- April 2007 sometime 2008 ($$$ and cryo engineering)
**Demonstration of multiple cavity RF distribution and independent amplitude & phase control**
- July 2007 sometime 2008 ($$$, cavity delivery, and LLRF engineering)

## Manpower Resources are Finite and Small

**HINS is now on third AD mechanical engineering liaison in 18 months and he’s planning to retire around this year’s end**
**Key TD engineers were called to design fixes for LHC triplet magnet problem**
**Cryogenics engineering resources are in high demand from all corners; HINS priority is low**
**Key technical systems now (****still, since May 2006****) lacking required attention**
- RF power distribution system (tightly coupled with cavity design status and power requirements)
- Low level RF systems – system design, modeling, hardware
- Cryogenics delivery system engineering for the Meson Linac cave
- Beam instrumentation systems

## Critical FY08 Needs

**To stop budget erosion**
- ~$5M M&S budget in FY06 (2.8 FNAL, 2.2 collaborating Labs)
- ~$3M guidance in FY07 reduced to ~$2M
- ~$2M anticipated for FY08
**Cryostat for pulsed SC spoke cavity testing**
- Cryostat design and procurement
- Dedicated mechanical and cryo engineering with drafting support (1 FTE eng., 1 FTE drafting)
- Cryogenics installation in test cave
- Dedicated cryo engineering and installation techs (0.25 FTE eng., 0.5 FTE tech)
- $350K M&S
**SC solenoid/cavity/cryostat design and prototyping **
- Cavity fast tuner design and prototyping
- Mechanical engineer with controls and tech support (1 FTE eng., 0.5 FTE tech)
- Beam line cryostat design
- Cryo/mechanical engineer and drafting support (0.3 FTE eng., 0.4 FTE tech)
- Focusing solenoid design and prototype
- Magnet designer and drafting support (0.3 FTE eng., 0.4 FTE tech/drafting)
- RT solenoid helium vessel and lead design and partial procurement (0.25 FTE eng., 0.4 FTE tech/drafting)
- $300K M&S

## Critical FY08 Needs

**Cavity control, beam loading simulation, and LLRF system design**
- Simulation
- Dedicated accel physicist or engineer (1 FTE)
- LLRF system design and prototype implementation
- Dedicated LLRF engineer with tech support (1 FTE eng., 0.75 FTE tech)
- $100K M&S
**High power RF distribution design**
- Design for 60 MeV linac
- Dedicated RF engineer (0.5 FTE)
- Procurement for room temp section and one cryostat
- $250K M&S
**Procure spare klystron at risk of 1 year program delay**
- $500K M&S
**SC spoke cavity/cryomodule/drive coupler procurement**
- Begin progurement of one full cryomodule minimum
- Dedicated mechanical and cryo engineering with drafting support (1 FTE eng., 1 FTE drafting)
- $850K M&S
**Support equipment, installation, and utilities**
- $150K M&S

## Summary

**HINS R&D program is still alive**
**Progress continues to be made**
- 325 MHz klystron has been commissioned
- First room temperature spoke cavity will be tested with RF power this month
- First superconducting spoke cavity is fabricated and being prepared for vertical cryostat test
**Current status is generally 9-12 months behind schedule presented 15 months ago to the AAC in May 2006**
- Expect full voltage test of first superconducting spoke cavity in ILC-VTS this year
- Hope for 2.5 MeV beam by end of 2007
**Critical manpower and larger than anticipated FY08 budget needed to minimize further delays**

## Back-up Slides

## From May 2006 AAC Report

- The plan has a number of challenges, requires development of several technologies, and many of the components are at the frontier of R&D in this field.
- The overall schedule seems to be ambitious but manageable, and the committee supports the plan, with the recommendation that a detailed schedule with milestones and deliverables be developed.
- In addition, the committee recommends that
**sufficient diagnostics be included in the test facility to fully verify success as well as understand unexpected results**
**detailed simulations be performed to verify the vector modulator specifications and performance**

## Meson Building Floor Plan

## Meson Building Floor Plan

**90 MeV Linac**

**Klystron and Modulator Area**

**RF Component Test Facility**

**Cavity Test Cave**

**200 ft.**

**Ion Source and RFQ Area**

## R&D Plan

**Install and commission 2.5 MW, 325 MHz klystron system**
**Equip and operate a 325 MHz high power RF component test facility and cavity test cave**
**Fabricate, install, and operate a test cryostat for 325 MHz SC spoke cavities**
**Assemble the 10 MeV RT Linac, operate with beam, and verify performance**
**Install 325 MHz SC spoke resonator cryomodules and operate with beam to 60 MeV**
**This all adds up to building a one-of-a-kind superconducting 60 MeV H- linac**** **

## Linac and Absorber Enclosure

**Equipment**
- Accelerating cavities, RF power distribution, other beam line components, and all utilities and support equipment required to accelerate protons or H- ions to 90 MeV
- Beam absorber
**Activities**
- Commission and operate 90 MeV beam at maximum ~10KW intermittent beam power

## Major Activity Areas in Meson

**325 MHz Klystron and Modulator Area**
**325 MHz RF Component Test Facility**
**Cavity Test Cave (RT-CH and superconducting cavities)**
**Ion Source, RFQ, and 2.5 MeV Absorber Area**
**60 MeV Accelerator and Beam Absorber Cave**

## 325 MHz Klystron and Modulator Area

**Equipment**
- Modulator
- Klystron
- Waveguide, circulator, power divider, waveguide switch and RF load
- Low level electronics
**Activities**
- Commission and operate klystron power system

## 325 MHz RF Component Test Facility

**Equipment**
- Waveguide with shuttered component test interface
- DC/pulsed medium power supplies
- Low level and diagnostics electronics
**Activities**
- Installation and testing of various 325 MHz RF components over a wide range of RF power levels

## 325 MHz Cavity Test Cave

**Equipment**
- Facilities for power testing of room temperature and superconducting RF cavities
- Cavity test cryostat
- Vacuum equipment
- Low level and diagnostics electronics
**Activities**
- Install and test various 325 MHz RF cavities (RT-CH and superconducting) up to full power (~100KW maximum pulsed)

## Summary

**Considerable activity is now underway on component design, procurement, and facilities to support planned R&D**
**It will be an exciting next 12 months to bring 325 MHz klystron and RFQ on-line and to accelerate beam in the Meson Building**
**Key areas, presently lacking effort necessary to maintaining desired schedule, have been identified**