Transcript Intense Muon Sources for Future Accelerators

An Intense Muon Source for
Future Accelerators
Norbert Holtkamp
Project Presentation, Sept. 30th 1999
• 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
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 S Nm not 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
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 Ring
Energy
GeV
50
decay ratio
%
>40
inv. Emittance
m*rad
0.0032
m
160
 in straight
12
10
6
Nm/pulse
mrad
2.0
typical decay angle of m  
mrad
0.2
Beam angle (
m
3x105
Lifetime c*
Neutrino Source Study @ FERMI
• Application of a “Generic Neutrino Source”
to specific site
• Base the study on specific set of Parameters
T itle:
nupict.dvi
Creator:
dvipsk 5.58f Copyright 1986, 1994 Radi cal Eye Software
Preview:
T his EPS pic ture was not s aved
with a preview i nc luded i n i t.
Comment:
T his EPS pic ture wi ll pri nt to a
Pos tScri pt printer, but not to
other types of printers.
Generic Layout
collaboration
paper
“deviate wherever
necessary or useful”
Physics Study in parallel
H. Schellmann / S. Geer
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: m+/m- -> e+/-ne/nm
• Kinematics from decay well known
• Polarization -> oscillation of ne component
Choice has been made !
Parameters for the Neutrino Source
- Energy of the ring
- Number of neutrinos /
straight
- no polarization
GeV
50
2x1020/y
- capability to switch
between m m
- FERMI to SLAC / LBNL
• Basic Calculation
– 1/3 of the muons decay in the straight section
– 10 protons for 1 m 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 m 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
Is 22 % steep ?
•17 % into a quarry
•there is water !
•incremental cost small
compared making more n
•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)
30 - 60 MHz rf
~ 5 MV/m
•
•
•
•
•
16 GeV protons at 2.5x1013
1 bunches per pulse on target
solid graphite type target (NuMI)
0.6 p+ per proton
pz ~ pt 200 MeV/c with sE ~ 100 %
After ~ 100 m Drift
T itle:
PRs im.dvi
Creator:
dvipsk 5.58f Copyright 1986, 1994 Radi cal Eye Software
Preview:
T his EPS pic ture was not s aved
with a preview i nc luded i n i t.
Comment:
T his EPS pic ture wi ll pri nt to a
Pos tScri pt printer, but not to
other types of printers.
• Develop the correlation
T itle:
PRs im.dvi
Creator:
dvipsk 5.58f Copyright 1986, 1994 Radi cal Eye Software
Preview:
T his EPS pic ture was not s aved
with a preview i nc luded i n i t.
Comment:
T his EPS pic ture wi ll pri nt to a
Pos tScri pt printer, but not to
other types of printers.
T itle:
PRs im.dvi
Creator:
dvipsk 5.58f Copyright 1986, 1994 Radi cal Eye Software
Preview:
T his EPS pic ture was not s aved
with a preview i nc luded i n i t.
Comment:
T his EPS pic ture wi ll pri nt to a
Pos tScri pt printer, but not to
other types of printers.
• Here comes the induction Linac
– 100 - 150 meter, 1 MV/m
– talk tomorrow by Simon Yu
Cooling Principle
 = 0.0015 x 10-3 p 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
Full length structure
• 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
Ultra-High-Speed TOF for mCool
(going on)
• Probe transverse and longitudinal phase
space, mCool 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 W 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
Enhance the E Field
on Axis by using a grid
Goal: 15 MV/m
nc cavities
~ 0.65 m
Man Power
Neutrino source study
NUMI
ES&H
FESS
Tech. Div.
E/E
Cryo
Mechanical support
RF
General Facilities
RF/Proton source
Beam Physics
total
0.5
0.5
1.0
1.0
1.0
1.0
1.0
1.0
0.5
1.0
2.0
target
rf
Diagnostics
?
10.5
10.5
Finish work in Lab G
Proton source
Mechanical support
E/E
controls
Cryo
total
1.5
1.0
0.5
1.0
1.0
5.0
5.0
New R&D for Neutrino Source (low Frequ. Rf)
Proton source
Mechanical support
total
0.5
0.5
1.0
1.0
Proton Driver
Proton source
Beam Physics
Muon Collider / MI
Tevatron RF
Mechanical support
E/E
consultants
1.2
2.9
0.9
1.0
0.3
1.0
0.7
total
8.0
to Neutrino Source for 6 month
4.1
total for MC/Neutrin Source + Proton driver
8.0
24.5
Budget Request
Only additional request are written down here
Collaboration money to Fermilab:
(" Muon collider")
Labg G
805 MHz in Lab G
200 MHz cavity
test stand for 200 MHz
$
$
$
$
100.00
150.00
400.00
400.00
Instrumentation
LH_2 cell prototyping
solenoid studies
conductor for sc solenoids
beamline preparation
consultants
money left from FY 99
$
$
$
$
$
$
$
50.00
100.00
50.00
100.00
50.00
250.00
<-----
total collaboration money
$ 1,650.00 (fits the expected 1.4)
(there will be 250 k$ left
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
accelerator studies
induct. Linac
target
$
$
$
$
50.00
50.00
100.00
25.00
(Protvino)
(CEBAF)
(LLNL, Dubna)
(Oak Ridge)
$
225.00
$
217.00
for proton driver
7.5 MHz cavity
beamloading compensation
beam pipe prototype
inductive insert
$
$
$
$
85.00
37.00
85.00
10.00
(guess)
Budget Request
for misc
consultants
operation
travel
$ 100.00
$ 50.00
$ 100.00
Mills, Griffin, Ritson
$ 250.00
for tech division
for FESS
$ 200.00
$ 200.00
$ 400.00
total Fermi money
$
1,092.00
total for Muon collider + neutrino source
$ 2,742.00
• 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