Muon Collider Collaboration Meeting, LBNL 101/26/2009

Muons, Inc.

Loaded Pillbox Cavity

Milorad Popovic

(with Mike, Chuck, Katsuya, Al and Rol)

Motivation

Muon Collider Collaboration Meeting, LBNL 201/26/2009

Muons, Inc.

To fit pressurized cavities in HCC, size of cavity has to be reduced800 MHz (from Katsuya)

Maximum RF cavity radius = 0.08 m, (pillbox cavity 0.143)Radius of effective electric field (95 % from peak) = 0.03 m

400 MHz:Maximum RF radius = 0.16 m (pillbox cavity 0.286) Radius of effective electric field = 0.06 mOptimum electric field gradient = 16 MV/m

rrR

c

405.2

For Pill Box Cavity, resonant frequency is

Dielectric Loaded RF CavitiesNew type of cavity is suggested. The idea came from conversation with Chuck and Yonehara.

01/26/2009 3Muon Collider Collaboration Meeting, LBNL

Muons, Inc.

Cu/Steel

ceramicsVaccum/H/He

I was told that Al suggested something like this.

SuperFish Model

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Muons, Inc.

DielectricCavity, epsD=10, muD=1 F = 814.12558 MHz

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Muon Collider Collaboration Meeting, LBNL01/26/2009

14.3cm

400MHz Cavity

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Muons, Inc.

DielectricCavity, epsD=10, muD=1 F = 400.52798 MHz

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Muon Collider Collaboration Meeting, LBNL01/26/2009

28.6cm

361MHz Cavity

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Muons, Inc.

DielectricCavity, epsD=10, muD=1 F = 361.80859 MHz

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01/26/2009 Muon Collider Collaboration Meeting, LBNL

HCC Concept

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Muons, Inc.

Central Orbit and Beam Envelope Set of Coils

Basic Building Block can be Cavity + Coil

01/26/2009 Muon Collider Collaboration Meeting, LBNL

MANX + RF ?

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Muons, Inc.

Detectors Cavity + CoilCryostat

Vessel

Feedthroughs

Power inSignals out

MICE will have~?MV @200MHz

01/26/2009 Muon Collider Collaboration Meeting, LBNL

Other Applications

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Muons, Inc.

May be we can use this type of cavity for Neuffer’s Phase Rotation Canal. This was Cary Yoshikawa suggestion. The canal needs many cavities in range from ~300 to 200MHz. We can use, let say two sizes of Pill Box Cavity (same size different dielectric!) and adjust frequency in between using different iner radius, re-entrant nose cones!

01/26/2009 Muon Collider Collaboration Meeting, LBNL

Cavities for Neutrino Factory

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Muons, Inc.

Schematic of the Neutrino Factory front-end transport system. Initial drift (56.4 m), the varying frequency buncher (31.5m), The phase-energy (-E) rotator (36m) , a cooling section.(A 75m cooling length may be optimal.)

Parameter Drift Buncher Rotator Cooler

Length (m) 56.4 31.5 36 75

Focusing (T) 2 2 2 2.5 (ASOL)

Rf frequency (MHz) 360 to 240 240 to 202 201.25

Rf gradient (MV/m) 0 to 15 15 16

Total rf voltage (MV) 126 360 80001/26/2009 Muon Collider Collaboration Meeting, LBNL

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Muons, Inc.

What is Next, 5-Years Plan

…We will also accomplish sufficient hardware R&D (RF, magnets, and cooling section prototyping) to guide, and give confidence in, our simulation studies.

The projected funding for the 5-year program proposed here..

In order to produce a practical helical cooling channel, several technical issues need to be addressed, including: magnetic matching sections for downstream and upstream of the HCC a complete set of functional and interface specifications covering field quality and tunability, the interface with rf structures, and heat load limits (requiring knowledge of the power lead requirements) To prepare the way for an HCC test section we would: Develop, with accelerator designers, functional specifications for the magnet systems of a helical cooling channel, including magnet apertures to accommodate the required rf systems, section lengths, helical periods, field components, field quality, alignment tolerances, and cryogenic and power requirements. The specification will also consider the needs of any required matching sections. Perform conceptual design studies of helical solenoids that meet our specifications, including a joint rf and magnet study to decide how to incorporate rf into the helical solenoid bore, corrector coils, matching sections, etc.

01/26/2009 Muon Collider Collaboration Meeting, LBNL

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Muons, Inc.

What is NextFIRM NAME:

Muons, Inc.RESEARCH INSTITUTION:

Fermi National Accelerator LaboratoryMilorad Popovic, subgrant PI

ADDRESS:

552 N. Batavia Ave.Batavia, IL 60510

ADDRESS:

Phase I-SBIR/STTR Fiscal Year 2009(All information provided on this page is subject to release to the public.)NAME of PRINCIPAL INVESTIGATOR: Michael Neubauer PHONE NUMBER: (707) 360-5038PROJECT TITLE: 46a Dielectric Loaded RF Cavities

Loss tangent tan d = 1/Qdielectric-1/Qair

Loss tangents of specially formulated alumina with TiO2 have been reported to be close to sapphire at 1e-5 . So it is easy to see that today’s ceramics may be used in this novel idea without suffering a great deal in cavity Q at low frequencies.

 The other problem with ceramics in vacuum with beams is that of surface charging of the ceramic. And again, much work has been done in coatings, from Chromium Oxide to TiN to, more recently, ion implantation Air gap between the dielectric and metal plates will be one of the issues that must be tested experimentally

SBIR

Main Issues

01/26/2009 Muon Collider Collaboration Meeting, LBNL

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Muons, Inc.

• May be ceramics can play additional role, making volume of Hydrogen smaller and making cavity stronger so the walls do not have to be as thick as without ceramics. • RF power can be fed using loop between two rings. • Cavities can be put next each other so the side wall can be made thin• May be we should do experiment in the MTA, with solenoid!

01/26/2009 Muon Collider Collaboration Meeting, LBNL

Ceramics EXIST!

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Muons, Inc.

01/26/2009 Muon Collider Collaboration Meeting, LBNL

Ceramics for Gap

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Muons, Inc.

01/26/2009 Muon Collider Collaboration Meeting, LBNL

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Muons, Inc.

01/26/2009 Muon Collider Collaboration Meeting, LBNL

Vacuum Cavity for Phase Rotation

Dielectric Liquid

Beam

Ceramics&StainlessSteel Rings

Test Cavity

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Muons, Inc.

01/26/2009 Muon Collider Collaboration Meeting, LBNL

Neutrino Factory as 1st Step Toward Muon Collider

1GeV H- Linac <1 Structure

7GeV H- Linac =1 Structure

Proton Accumulation,Bunching Ring, 10 bunches

5x14GeV Linac =1, 50Hz

1 GeV ,200MHz Linac

4 GeV ,400MHz DogBone Linac

2-4MW-Target

Capture/Bunching/Cooling

Proton Driver 2-4MW, 5Hz

01/26/2009 Muon Collider Collaboration Meeting, LBNL

8GeV H- Beam

H-Striping&ProtonAccumulation

BunchingTargeting

CuptureBunchingCoolingAcceleration

DUSEL

4 or 40GeV -Fact

80GeVLinac

80GeVLinac

ColliderRing

Muon Collider Stage

01/26/2009 Muon Collider Collaboration Meeting, LBNL

80GeVLinac

80GeVLinac

ColliderRing

mAcceleration

mCollisions