Muon Acceleration Plan

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16 Νοε 2013 (πριν από 3 χρόνια και 8 μήνες)

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Muon Acceleration Plan

David Kelliher

ASTeC/STFC/RAL

UKNF WP1, October 9
th
, 2008


Remit of Muon Acceleration study


Study includes current RLA and FFAG stages
(possibly including the 50 GeV upgrade)


Lattice possibilites

FFAG


Doublet, Triplet and FODO non
-
scaling lattices
under consideration


One or two cavities per cell

RLA


Dogbone


(or Racetrack with FFAG arcs)



FFAG lattice study


Step 1


Current possible lattices must firstly be
compared in terms of feasibility of
injection/extraction

(e.g. strength of required
kicker/septum)


From this consideration a couple of candidate
lattices may emerge. It is also possible that a
modified lattice will have to be designed to
enable injection/extraction (e.g. lattice with
longer straight section).


FFAG lattice study


Step 2


The candidate lattices that emerge from step 1 will be subject
to detailed tracking studies.


Study of
longitudinal dynamics
will

1.

Calculate the required voltage to avoid longitudinal blow
-
up.

2.

Assess the feasibility of
serpentine acceleration
in the
presence of cavity phase and voltage errors.


In
transverse dynamics
the problems associated with tune
excursion will be studied.

1.
Investigate affect of any
chromaticity correction
on
dynamic aperture.

2.
The dynamic aperture in the presence of
misalignments
and gradient errors

to be calculated
.

3.
Consider methods of orbit correction




RLA lattice study


Step 1


Understand present design by Alex Bogacz.


Investigate whether improvements can be
made to the
focusing optics
and to the
switchyard design


Study a new arc utilising the FFAG concept.


RLA lattice study


Step 2


Detailed tracking study in the baseline lattice
that results from step 1. In particular,

1.
Solve
time of flight
problem. This may
require the addition of non
-
linear
multipole

terms.

2.
Calculate the resulting reduction in
dynamic aperture.



Beam transport lines


Design of the transport lines between
accelerating stages and the storage rings will
be included in the study



Milestones


Complete
Step 1
, i.e. decide on candidate lattices. We
estimate that this will take 1 year.



Step 2


detailed evaluation of the candidate lattices +
design of beam transport lines. This step will take more
time if a previously unstudied lattice is chosen from step
1 and will take in the region 1
-
2 years.




Personal Contribution (Step 1)


Begin by working on injection and extraction in the non
-
scaling FFAG

1.

By tracking the injection orbit, calculate kicker and septum
strength required to keep beam envelope within magnet
aperture for each of the lattices under consideration.

2.

If necessary, study affect of adding longer straight sections
into a non
-
scaling FFAG.


Undertake code development as required (ongoing).

1.
Investigate how a fringe field can be implemented in
Zgoubi

tracking code that is valid for particles far from magnetic axis.

2.
Contribute to end
-
to
-
end simulation effort.



Personal Contribution (Step 2)


Participate in step 2 studies, i.e. studies of
longitudinal and transverse dynamics in candidate
lattices and design of transfer lines, using Zgoubi and
PTC tracking codes