Transcript Proton Driver

Muons, Inc.
Loaded Pillbox Cavity
Milorad Popovic
&
Katheryn Decker French
(with Mike, Chuck, Katsuya, Al and Rol)
11/15/2010
MuCool Test Area RF Workshop
1
Muons, Inc.
Motivation
To fit pressurized cavities in HCC, size of cavity has to be reduced
800 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 m
Optimum electric field gradient = 16 MV/m
For Pill Box Cavity, resonant frequency is
2.405c

R  r r
11/15/2010
MuCool Test Area RF Workshop
2
Muons, Inc.
Other Applications
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!
11/15/2010
MuCool Test Area RF Workshop
3
Cavities for Neutrino Factory
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
Length (m)
Focusing (T)
Rf frequency (MHz)
Drift
Buncher
Rotator
Cooler
56.4
31.5
36
75
2
2
2
2.5 (ASOL)
360 to 240 240 to 202
201.25
Rf gradient (MV/m)
0 to 15
15
16
Total rf voltage (MV)
126
360
800
11/15/2010
MuCool Test Area RF Workshop
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Work done in Summer 2010
11/15/2010
MuCool Test Area RF Workshop
5
Simulation-Microwave Studio
11/15/2010
MuCool Test Area RF Workshop
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Cavity Prototype & Measurements
11/15/2010
MuCool Test Area RF Workshop
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Results & Conclusions as August 2010
11/15/2010
MuCool Test Area RF Workshop
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Muons, Inc.
Near Future Possibilities
•Build high power 800MHz cavity with Dielectric at Gap
•Modify it for use with Dielectric Liquid
•Put it inside Solenoid Magnet
•Do the same for 200MHz
This program can be executed for 20 to 40K$ M&S
This program can be accomplished in 4 to 8 months
There will be need for two periods of one week each of MTA
Muons, Inc has expressed interests in participation,
intellectually and monetary
We may be lucky and motivate somebody to put effort
in low loss ceramics research and design
Help is need it and everybody is welcome
11/15/2010
MuCool Test Area RF Workshop
9
Muons, Inc.
11/15/2010
Ceramics for 200MHz & cavity for 800MHz
MuCool Test Area RF Workshop
10
Solenoid, Cavity, Liquid, …
Solenoid
Dielectric
Liquid
RF
cavity
Container
11/15/2010
MuCool Test Area RF Workshop
11
Muons, Inc.
11/15/2010
MuCool Test Area RF Workshop
2
Muons, Inc.
11/15/2010
MuCool Test Area RF Workshop
2
Muons, Inc.
HCC Concept
Central Orbit and Beam Envelope
Set of Coils
Basic Building Block
can be Cavity + Coils
12/09/2008
Muon Collider Design Workshop, Jefferson Lab
14
80GeV
Linac
mAcceleration

Collider
Ring

80GeV
Linac
mCollisions