# Presentation: 843128

## Plans and goals of ILC activities at FNAL

- Sergei Nagaitsev
- Fermilab
- January 24, 2004

## The Baseline Machine (500GeV)

**Nick Walker – GDE meeting Frascati 8.12.05**

## Gradient (yet to be demonstrated)

|  | Cavity type | Qualifiedgradient | Operational gradient | Length* | energy |
| --- | --- | --- | --- | --- | --- |
|  |  | MV/m | MV/m | Km | GeV |
| initial | TESLA | 35 | 31.5 | 10.6 | 250 |
| upgrade | LL | 40 | 36.0 | +9.3 | 500 |

- * assuming 75% fill factor

- Total length of one 250 GeV linac  10km
- Need for each linac: 	7872 Nb cavities
- 				984 cryomodules
- 				328 Klystrons
- 			...many km’s of waveguides

## ILC at Fermilab

- Two main branches:
-       Develop world class SCRF expertise: module
-       fabrication facility + module test facility
-       “Reference Design Report effort”: machine 	design and site studies

## Two groups of tasks

- R&D to develop ILC technology
- This is the bulk of our effort
- Some tasks are described in an MOU with the GDE
- FY06: M&S+Labor+overhead: $10M  (GDE)+ $10M(Fermilab)
- Focus = Main Linac Components and Site development
- Develop SCRF infrastructure ( for both ILC and PD)
- Develop beam test facility
- Design and Cost the machine
- Guided by the GDE
- FNAL was asked to assume new tasks at the Frascati GDE meeting in Dec 2005
- Goal: Complete Design, and Engineering to prepare the ILC Reference Design Report for review by the end of 2006

## FNAL ILC Organization

- ILC Program Dir:        R Kephart
- Deputy:                      S Mishra
- Deputy:                      S Nagaitsev
- Resource Manager:     R Stanek

- Accel Div
- S Nagaitsev

- Tech Div
- S Mishra

- PP Div
- M  DeMarteau

- Comp Div
- P McBride

- FESS
- V Kuchler

-      Division Leaders function ~like “Project Managers”. They are responsible for Division ILC tasks and work with Division management to secure needed labor. They manage ILC resources assigned to the Division

## Global Design Effort

- The Mission of the GDE
- Produce a design for the ILC that includes a detailed design concept, performance assessments, reliable international costing, an industrialization plan , siting analysis, and detector concepts and scope.
- Coordinate worldwide R & D efforts (to demonstrate and improve the performance, reduce the costs, attain the required reliability, etc.)

## Baseline Configuration Document

- BCD is essentially the “specification” for the technical systems and performance of the ILC
- Started in Snowmass in August 2005
- “Ratified” at the Frascati GDE meeting in Dec 2005 and now under “change control”
- Changes to BCD must now go through an approval process by the Change Control Board
- Provides the basis for the design to be developed in the Reference Design Report (RDR)
- ACD = Alternative Configurations = options that are fully described and costed in the RDR

## RDR effort at Fermilab will focus on:

- ILC Main Linac Lattice and Low Emittance Transport Studies.
- Full linac simulation including feedback, beam-beam interaction at IR.
- Controls, LLRF, instrumentation
- Cryogenics, systems engineering
- US-ILC site development
- Considering several sites around Fermilab
- Alignment and Vibration
- Systematic Data collection and analysis
- Measurement of vibration from surface to ILC Depth near Fermilab site.
- Damping Ring
- Lattice Design, Instabilities, Cost etc.
- Machine Detector Interface and Energy Deposition Studies
- Energy Deposition and collimation for BDS and IR
- Background in detector and its mitigation
- Treatment of the spent beam downstream of IR.

## SCRF ILC EFFORT at Fermilab

- The buildings exist at Fermilab: need infrastructure to be built up: rf power, cryogenics, clean rooms, beam test facility
- Integrate into national effort: JLab, ANL, Cornell
- View SCRF infrastructure at Fermilab and the Main Linac design effort as a Package Deal:
- Learn how to fabricate (in the US) SCRF modules with 35 MV/m, Q = 0.5-1e10
- Develop capabilities to fully test the basic building blocks of the Main Linac including the Superconducting RF, RF power, LLRF, Instrumentation, Feedback and Controls for Main Linac

## ILC 1.3 GHz Cavities @ FNAL

- Delivery date September 09, 2005, fabrication time 6 month

-  Industry to fabricate cavities.
-  Cavities will undergo BCP and vertical testing at Cornell (25 MV/m)
-  EP and vertical testing at Jlab. ( 35 MV/m)
-  BCP facility being developed at ANL/Fermilab (in late 06)
-  High Power Horizontal test will be performed at Fermilab.

## ILC Cavity Processing 

- Infrastructure at Cornell and Jlab are being upgraded to process the 1.3 GHz ILC cavities.
- Fermilab is working on installation and commissioning of a BCP facility at ANL (March FY06)

-  An Electro-polishing facility is being designed by the ILC Collaboration to be build at ANL/Fermilab Cavity Processing Facility at ANL.

## ILCTA Infrastructure at FNAL

## Cryomodule Design and Fabrication

- In FY05 Fermilab started on converting the DESY/INFN design of the ILC cryomodule (Type-III+) for US vendor and cost reduction.
- The cryomodule is the significant cost in the Main Linac.  Industrial fabrication and cost reduction are important issues that we need to start now.
- The Goal is to design an improved ILC cryomodule (Type-IV).

## ILCTA@Fermilab - Cryomodule Assembly Facility

-  Cavity will be dressed in CAF for horizontal test at Fermilab at ILCTA-MDB.
-  Horizontally tested cavities will be assembled into a string at CAF.
-  Cryomodule fabrication takes place at CAF.

- Class 10 and 100 clean rooms have been ordered

-  This facility is designed based on improved design from DESY.
-  We can start fabrication of Cryomodule by May 06.

## Goals:

-  Closed loop process: module fabrication facility + module beam test facility
-  Test a basic building block of the ILC Main Linac: three cryomodules powered by a single Klystron (+LLRF, Instrumentation, Feedback and Controls for Main Linac )
-  Perform beam-related R&D

- Fermilab ILC test facility

##  Beam test plans

**Existing building**

**Existing FNPL Photo-injector**

- Build a dedicated ILC cryomodule test in the New Muon Lab
- Cleaning out building
- Install interim cryogenic solution in FY06
- Move FNPL Photo-injector to provide electron beam (Late FY06)
- First US cryomodule to be delivered for testing in June 07
- 2nd – June 08, 3rd -- +6 months, 4th -- +3 months
- Eventually, 1 cryomodule per month

## Reasons for beam tests (from SMTF meeting)

- Cavity gradient, gradient spread, dark current, cryogenic load, radiations levels with beam operation  Measure acc. gradient by measuring beam energy
- Evaluate performance of LLRF system: e.g. R&D on new algorithms; demonstrate 0.1% bunch-to-bunch energy spread over ~1 ms train
- HOM studies, including trapped modes;

## Reasons for beam tests

- Beam-based measurement of component alignment and vibrations
- Measure single bunch wake-field effect in cryomodules.  Based on this, develop algorithms for calibrating rf phases, amplitudes in cavities
- Measure beam kicks due to couplers, cavity tilt, quad rotations + tilt errors characterize focusing properties of SCRF cavities

## FNPL Injector Overview I

- Test bed for advanced
- accelerator physics

**FNPL Injector Overview I**

## FNPL Injector Overview II

- rf-gun can operate up to 150 sec,
- Modulator is limited to 600 sec
- Can provide the charge per bunch (Q~15 nC achieved)
- Recently upgraded drive laser oscillator provides

**FNPL Injector Overview II**

**800 ********s**

## Overview of SMTF with FNPL injector

- diagnostics

- 3 modules

- injector

**Overview of SMTF with FNPL injector**

## Max. Energy			1 GeV

- Max. Energy			1 GeV
- # Electrons/bunch		2×1010
- # bunches/train			2820
- Bunch rep. rate			3 MHz
- Train rep. rate			5 Hz
- Ave. current			50 μA
- Ave. beam power			50 kW

## FNPL-based injector overview (final stage)

- Generate 40-50 MeV “frozen” beam with controllable parameters (emittance +Twiss param.)
- Bunch compression capable of providing beam with I~1-2 kA for nominal ILC charge
- Possibility to generate asymmetric emittance beam (ideal to study emittance growth in one-plane in cryomodules)
- Incorporate diagnostics + room for proper instrumentation (e.g. for HOM measurement)
**Possibility of an off-line beamline for other test (DMC-based bunch length ****meas., or other advanced instrumentation/beam physics experiments)**

- Rf-gun

- Boos. Cav. 1

- Boos. Cav. 2

**3.9 Ghz Cav**

- doublet

- triplet

- triplet

- triplet

- Round-to-flat  beam trans.

- Bunch compr.

- Dump

- DMC Cav.

- Dump

- triplet

- dipole

- dipole

- Generation/acceleration

**FNPL-based injector overview (final stage)**

## Links to Proton Driver

- Communication is good right now, but we should make these links a bit more formal
- Regular ILC/PD meetings
- Plan for shared RF, CAF, & cryogenic systems
- Need a joint ILC/PD schedule to understand the use of shared SCRF infrastructure
- Need to agree on how to share costs
- Important to maintain ILC/PD synergy... this will drift apart if we are not careful
- Tunnel layout
- Klystron geometry
- Use of PD as electron linac test facility