An Intense Muon Source for Future Accelerators Neutrino Sources and Muon Colliders What is a Neutrino Source Neutrino Source Study at Fermilab Scope of

An Intense Muon Source for Future Accelerators

• Neutrino Sources and Muon Colliders• What is a Neutrino Source • Neutrino Source Study at Fermilab

• Scope of the Study • Ongoing MUCOOL R & D • Budget and Man Power Request

Norbert Holtkamp

Project Presentation, Sept. 30th 1999

Intense Muon Sources for Future Accelerators

• Collaboration has a new name:– “Neutrino Factory and Muon Collider Collaboration”

• Increasingly strong interest from the “Users” to develop an intense neutrino source– MUTAC: suggested to investigate a complete scenario

– Study going on: • CERN• Brookhaven• FERMI

• Long Term: it makes sense – needs less total muons per sec for first step

– Performance is proportional to Nnot N2

– less acceleration

– no longitudinal emittance exchange

– “First step to develop and use an intense Muon Source”

• Based on the methods and ideas developed for the Muon Collider– strip off everything which is not necessary

– might be a long term goal: Route to HEP

The Neutrino Source

• First experiment based on an intense muon source– small emittance not necessary because divergence is dominated

by decay kinematics

– recognized by S. Geer

Parameters for the Muon Storage RingEnergy GeV 50decay ratio % >40inv. Emittance m*rad 0.0032 in straight m 160N/pulse 1012 6typical decay angle of mrad 2.0Beam angle ( mrad 0.2Lifetime c* m 3x105

Neutrino Source Study @ FERMI

• Application of a “Generic Neutrino Source” to specific site

• Base the study on specific set of Parameters

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Physics Study in parallelH. Schellmann / S. Geer

Generic Layout

collaboration paper

“deviate wherevernecessary or useful”

The Task

• A design concept for a muon storage ring and associated support facilities that could, with reasonable assurance, meet performance goals required to support a compelling neutrino based research program.

• 2.Identification of the likely cost drivers within such a facility.

• 3.Identification of an R&D program that would be required to address key areas of technological uncertainty and cost/performance optimization within this design, and that would, upon successful completion, allow one to move with confidence into the conceptual design stage of such a facility.

• 4.Identification of any specific environmental, safety, and health issues that will require our attention.

The Energy Choice, the Experiment and the Options

• Purity of the beam: +/- -> e+/-e/

• Kinematics from decay well known

• Polarization -> oscillation of e component

Choice has been made !

• Basic Calculation– 1/3 of the muons decay in the straight section

– 10 protons for 1 into the storage ring

– how long is the year: 2x107 sec (versus 1x107)• 2x1013 proton on target per pulse @ 16 GeV and 15 Hz (Weirren talks

about this in detail)

• 2x1012 per pulse to be accelerated and injected into the ring

• longer bunch in the proton driver and on target (1 nsec 3)

• ring tilt angle is 13deg ( 22 %) instead of 35 deg (57 %)

• maximizing the straight section with respect to circumference

Parameters for the Neutrino Source

- Energy of the ring GeV 50

- Number of neutrinos / straight

2x1020/y

- no polarization

- capability to switch between

- FERMI to SLAC / LBNL

Is 22 % steep ?

•17 % into a quarry

•there is water !

•incremental cost small compared making more

•extend the ring up to the

surface

Further down the ramp Use vehicles

What changes compared to MC

• The Proton driver– one bunch (if induction linac

– longer bunch (-> no polarization)

• The target– could be: Ptarget is still of the order of 1, solid graphite)

• 16 GeV protons at 2.5x1013

• 1 bunches per pulse on target

• solid graphite type target (NuMI)

• 0.6 + per proton

• pz ~ pt 200 MeV/c with E ~ 100 %

30 - 60 MHz rf~ 5 MV/m

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After ~ 100 m Drift

• Develop the correlation


• Here comes the induction Linac– 100 - 150 meter, 1 MV/m

– talk tomorrow by Simon Yu

Cooling Principle =

0.0015 x 10-3 m rad

Goal & Schedule

• 6 Month study: “10 pages of paper per subsystem+ 1 schedule + 1 cost”– Internal Review Mid January to align the different

contributions

– Documents in by mid February

– Report out by March 1st

• Develop Alternatives for most risky parts– induction linac

– cooling channel design and performance

– acceleration: ( largest cost driver)• Jefferson Lab Cornell Fermilab

The Neutrino Source

• Approach:– go more conventional where ever possible

• target (solid), longer bunch in proton driver, remove (~30MHz) rf -> use induction linac,

• get outside expertise where necessary and/or useful (target, acceleration, induction linacs, sc solenoids)

– Oak Ridge the target

– Jefferson Lab / Cornell sc rf and re-circulating linacs

– Livermore induction linacs (talk tomorrow)

– IHEP Protvino sc solenoid channels

• general engineering (large scale rf systems, sc magnets, sc solenoid channels, ps, vacuum, beam lines, tunnel, water) come out of BD / TD (whatever division I can get)

• specific design and engineering (cooling channel, target collection, beam manipulation, beam tracking and simulation) Muon Collider group

MUCOOL Hardware R&D

• Lab G and the high gradient cavity

• 10 Picosec Time of Flight Monitor

• Develop a 200 MHz cavity suitable for operation in the cooling channel

Lab G Set-Up (going on)

• High Power 805 MHz RF– “Behavior of high gradient rf in strong magnetic field”

– Time scale to finish ~ next FY

RF Cave

Open Cell Cavity (going on)

• Iris aperture follows beam envelope– Gradient uniform over iris

• Parameters– 1 m long, ~30 MV/m on axis, 30 MW peak

• Specific Focus– high surface fields (~ 90 MV/m)

– clean surfaces and structures A0 infrastructure

• Test bed for other cavities and rf equippment

Full length structure

Ultra-High-Speed TOF for Cool (going on)

• Probe transverse and longitudinal phase space, Cool requires arrival-time tagging of muons to 10 ps.– This is 3-5 X better than has been done for small systems

– Plan is to use commercially available components and try to extend their performance range

• Technical concept– Direct image MgF2 Cerenkov disk using CsI PC

– Electron multiplier - micro-channel plate (MCP)

– 50 High frequency anode/connectors/cabling

• Basic Structure– UHV enclosure

– Cerenkov radiator• 2-5 mm MgF2

– CsI Photocathode

– MCP stack

– 50 Ohm anode

200 MHz Cavity + Power Source

• Engineering Layout required for the study• Want to build and test it, once study is done

1/8th of the full accelerating cell

~ 0.65 m

~ 0.65 m

Enhance the E Fieldon Axis by using a grid

Goal: 15 MV/mnc cavities

Man Power

Neutrino source study

NUMI 0.5 target

ES&H 0.5

FESS 1.0

Tech. Div. 1.0

E/E 1.0

Cryo 1.0

Mechanical support 1.0

RF 1.0 rf

General Facilities 0.5

RF/Proton source 1.0 ? Diagnostics

Beam Physics 2.0

total 10.5 10.5

Finish work in Lab G Proton source 1.5


E/E 0.5

controls 1.0

Cryo 1.0

total 5.0 5.0

New R&D for Neutrino Source (low Frequ. Rf)Proton source 0.5


total 1.0 1.0

Proton DriverProton source 1.2

Beam Physics 2.9

Muon Collider / MI 0.9

Tevatron RF 1.0


E/E 1.0

consultants 0.7

total 8.0 8.0

to Neutrino Source for 6 month 4.1

total for MC/Neutrin Source + Proton driver 24.5

Budget Request

Collaboration money to Fermilab:

(" Muon collider")Labg G 100.00$ 805 MHz in Lab G 150.00$ 200 MHz cavity 400.00$ test stand for 200 MHz 400.00$

Instrumentation 50.00$ LH_2 cell prototyping 100.00$ solenoid studies 50.00$ conductor for sc solenoids -$ beamline preparation 100.00$ consultants 50.00$ money left from FY 99 250.00$ <-----

total collaboration money 1,650.00$ (fits the expected 1.4)(there will be 250 k$ left FY99)

Fermi money for proton driver and neutrino source study(this is: paying people for paper work in other institutes and only a guess)

for the study:solenoids for the decay channel 50.00$ (Protvino)accelerator studies 50.00$ (CEBAF)induct. Linac 100.00$ (LLNL, Dubna)target 25.00$ (Oak Ridge)

225.00$ (guess)

for proton driver7.5 MHz cavity 85.00$ beamloading compensation 37.00$ beam pipe prototype 85.00$ inductive insert 10.00$

217.00$

Only additional request are written down here

Budget Request

for miscconsultants 100.00$ Mills, Griffin, Ritsonoperation 50.00$ travel 100.00$

250.00$

for tech division 200.00$ for FESS 200.00$

400.00$ total Fermi money

1,092.00$

total for Muon collider + neutrino source2,742.00$

• Travel: – I understand that this is an issue – Most of this work is done within and with the help of the

collaboration– collaborations are dependent on communication

• Budget Situation (management point of view)

– “60 cent from the $” (John Marriner)

– 6 month /0.6 = 10 month and all the money

Summary

• Is that an increase?– For man power: Yes: more than doubles the overall

effort, explicitly for the next six month

– For money: • Yes: expect 1.4 M$ compared to 710 k$ last year from DOE

• Yes: from the Lab but how much ??

• What after six month:– Long Term goal and program

– Study is crucial