# Presentation: 488490

## ILC and AARD plans at New Muon Lab

Sergei Nagaitsev

**Sergei Nagaitsev**

## ILC S2 recommendation

- ILC S2 task force (string test definition) recommends: the minimum size system test needed to confirm the performance of a new design is a single RF unit with ILC like beam.
- ILC RF unit is 3 CMs powered by a 10 MW MBK
- Many tests are statistical in nature, a longer string test with several RF units would be better.

- September 26, 2007

- Nagaitsev

## Why beam tests?

- Cryomodule gradient calibration with beam energy spectrometer; there could easily be a 5-10% uncertainty in rf calibrations.
- Need energy spectrometer upstream and downstream of CMs.
- Many tests can be done at the Horizontal Test Stand.  What is missing:
- Beam loading effects;
- HOM excitations;
- Cavity alignment;
- Check static and dynamic heat loads
- Allows to train personnel by “doing” it.

- September 26, 2007

- Nagaitsev

## NML

- NML is a facility to be located in the existing building at Fermilab (New Muon Lab)
- New Muon Lab building is part of Fermilab’s ILC Test Areas (ILCTA_NM)
- Other areas are: MDB (horizontal SCRF cavity test stand), IB1 (vertical test stand) etc.
- The first NML user will be the ILC program.
- The cryomodule tests are also essential to Project X (β=1)
- The Accelerator R&D (AARD) portion will first piggy-back on these programs; its share will increase with time

- September 26, 2007

- Nagaitsev

## Fermilab NML plans

- The NML is being constructed to address primarily the ILC S2 R&D list
- However, our plans go beyond S2.  We would like to include elements of S4 R&D tasks (crab-cavities), diagnostics development, personnel training, and accelerator R&D.
- The NML facility is staged (1 CM, 2 CMs etc); when complete, it would include 1 (or 2) rf units running ILC-like beam at 5 Hz.
- 1 rf unit with beam requires building an extension tunnel and a new cryo-plant
- The progress is resource limited

- September 26, 2007

- Nagaitsev

## NML Project Overview

- Overall Plan
- Build an ILC RF Unit Test Facility at New Muon Lab Building (NML)
- One ILC RF Unit (3 Cryomodules)
- 10-MW RF System
- ILC-like Beam (3.2 nC/bunch @3 MHz, Up to 3000 bunches @ 5Hz, 300-μm rms bunch length)
- Phase-1 (FY07 - FY08)
- Prepare Facility for Testing of First Cryomodule (CM1) without Beam
- Infrastructure; RF Power; Cryogenics (Refrigerator #1)
- Phase-2 & 3 (FY08 - FY11)
- Install Gun, Injector, CM2 and CM3, Test with Beam
- New RF Gun
- Move A0 Photo-Injector to NML and Install Test Beamlines
- Extend Building to fit Third Cryomodule
- Cryogenics (Refrigerator #2 and New Cryoplant-300W)
- Upgrade RF System to 10 MW

- September 26, 2007

- Nagaitsev

## Phase-1 Layout of NML

- September 26, 2007

- Nagaitsev

- Cryomodule-1 (CM1) (Type III+)

- Capture Cavity 2 (CC2)

- CC2 RF System

- 5 MW RF System for CM1

## Overall layout of New Muon Lab

- September 26, 2007

- Nagaitsev

- Cryomodules

- Capture Cavity 1 (CC1)

- CC2

- Gun RF System

- CC1 & CC2 RF

- RF Gun

- 5MW RF System for Cryomodules

- Space for 10 MW RF System

## NML building extension

**NML building extension**

- Began Design of NML Extension with CF&S Group (FESS)
- Room for 6 Cryomodules (2 RF Units)
- Expanded Diagnostic and AARD Test Area
- Cryoplant (300W)
- Possible 2-Tunnel Design to Mock-up ILC Design

- September 26, 2007

- Nagaitsev

## Current photo on NML

- September 26, 2007

- Nagaitsev

## ILC-like beam?

- 3.2 nC/bunch @3 MHz, up to 3000 bunches @ 5Hz
- Bunch length: 300-μm rms
- Transverse emittance: not important (~5 μm)
- Energy: 40-50 MeV
- Need “known and frozen” beam parameters at the cryomodule entrance

- September 26, 2007

- Nagaitsev

## A list of some ILC tests at NML

- Demonstrate stable long-term high-gradient beam operation at ILC-like bunch parameters.
- Demonstrate HOM power absorption
- 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.
- Test ILC crab cavities.
- Test the ILC installation procedure and tunnel layout.
- May evolve into a near-final system integration test.
- Test alternative designs (see P. Piot’s poster)

- September 26, 2007

- Nagaitsev

## “Cold” L-Band Cavity BPM

- September 26, 2007

- Nagaitsev

- High resolution (< 1 μm), “cold” BPM located in the cryomodule.
- Waveguide loaded, coupled through ceramic window slot.
- Dipole- and monopole mode ports, requires no reference cavity.

## Bunch Arrival / Beam Phase

- September 26, 2007

- Nagaitsev

**courtesy *****F. Loehl***

## NML Injector Layout

- September 26, 2007

- Nagaitsev

## Fermilab A0 Photoinjector

- September 26, 2007

- Nagaitsev

**(CC-1)**

**13m**

- The A0 photo injector will be relocated to NML in early CY2008.  At present, it is used for AARD, commissioning of devices for NML and for personnel training.
- A0 has 2 graduate students.

## A0-Photoinjector Instruments

- September 26, 2007

- Nagaitsev

- Retrofit of A0-Photoinjector beam instrumentation hardware for NML:
- Button-type BPM pickup stations
- OTR, OTRI screen monitors, & others
- Faraday cup
- Bunch arrival monitor pickup

## A0-Photoinjector Instruments

- September 26, 2007

- Nagaitsev

- Retrofit of A0-Photoinjector beam instrumentation hardware for NML:
- Button-type BPM pickup stations
- OTR, OTRI screen monitors, & others
- Faraday cup
- Bunch arrival monitor pickup

## 3.9GHz Deflecting mode cavity

- 5 cell Cu for emittance exchange at A0
- 9 cell Nb at NML for beamslice diagnostics, 1st pass at HOM couplers for ILC crab cavity
- 2 x 9 cell Nb at ILCTA for ILC crab cavity phase control - need 67fs = 1

- September 26, 2007

- Nagaitsev

## NML summary

- NML is being constructed to address the ILC S2 R&D list, to test ILC baseline and alternative components, and to conduct AARD.
- The A0 photoinjector will be part of the NML facility
- Progress is resource limited
- FY07: 4.9M$ (M&S direct), 40 FTE’s
- FY08: anticipate similar resources
- Collaborations:
- SLAC will supply RF distribution system.  May be a model for Project X.
- ANL, DESY, KEK, INFN
- Already have 2 graduate students in accelerator physics working on NML design.
- AARD program is still developing
- Had a workshop in Nov 2006 to “gauge” outside interest
- See Piot’s poster for details.

- September 26, 2007

- Nagaitsev