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
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An Intense Muon Source for Future Accelerators Neutrino Sources and Muon Colliders What is a Neutrino Source Neutrino Source Study at Fermilab Scope of.
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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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Title:PRsim.dviCreator:dvipsk 5.58f Copyright 1986, 1994 Radical Eye SoftwarePreview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.
After ~ 100 m Drift
• Develop the correlation
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• 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
Mechanical support 1.0
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
Mechanical support 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
Mechanical support 0.3
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)