(see attached overleaf from 31st May meeting)

haddockhellskitchenUrban and Civil

Nov 15, 2013 (3 years and 7 months ago)

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Beamline Optics meeting, 12:30 BST (06:30 Fermilab).

31
st

May 2006


Present: KT,

PD
, KL

Phone: CR, TJR
, KW


Notes added at time of meeting in
green.


Agenda.


1)
Notes/Actions

from 2006
-
05
-
31


(see attached overleaf from 31st

May meeting
)



2) Status of
work



-

G4BL Evaluations


-

Tom described the results of his evaluation of cm14
-
7.1
-
200.

The presentation can be found under CM14
-
7.1pi
-
200
-
TJR.ppt.


-

Rates had been found to be 3.6MH
z at TOF0

and Good muons
1049/msec. This
could allow shallower target d
ip, reducing TOF0 rate
-
> 2.1MHz @ 600

Good muons/msec
. The emittance calculation algorithm

had been reviewed. In brief:
+/
-
10% cut on Ptot, hit in all Tracker 1
stations. The resulting

emittance was found to be 11.7
pi mm rad for
this design of 7.1pi mm ra
d. Beta averaged ~ 0.38m but both beta and

alpha showed notable variation in the tracker (unmatched).

-

KW described his results.
Wor
k had extended to evaluate cm14
1,7.1 and 10
-
200 optics. Cm14
-
7.1
-
200 had TOF0 rate of 3.6MHz (=
TJR
result), 0.9MHz Good mu
ons. Cm14
-
10
-
200 showed TOF0 rate of 3.3MHz
,
0.7MHz Good muons. The d
ata cuts were being implemented

prior to
completing the emittance evaluation.


-

Optimisation plans.

-

KW had applied his optimiser against his cm14
-
7.1
-
200 case.
It had reduced beta from

452mm to 388mm although the emittance
he had
had increased from 11.2
-
> 12.4 pi mm rad.


-

aob

-

The aperture of

B1
had reduced since the distribution of the
CM14….xls spreadsheet. The
thickness of the
u/stream
vacuum tube had
also received some engineeri
ng design.

This should be folded in m
ore
formally later on.


3) EPAC06 paper (
www.epac06.org
)


-

It was recognised that there were a many pressures competing
with the E
PAC06 paper! The upcoming request

was still for a

draft
from e
ach of the authors by

the 7
th

June though!

(
KT,KW,TJR
)


4) Beamline Review (PD/ALL)


Monday 12
th

June


For aim and scope see:
-

http://www.is
is.rl.ac.uk/accelerator/MICE/TechBoard/D&S/2006
-
06
-
12%20Beamline/Index.htm
l


The

following Review agenda was proposed
:
-



Intro: PD



Tranport/Turtle:KT



Simulation:TJR/KW



Engineering:PD



Summary:?


Ideally, we should aim to distribute the documentati
on for the
review by Monday 5
th

June.
In view of TJRs commitments, it was agreed
that Kenny would update the Performance section of the TRD.

(
KW
)


We should also ideally have a draft of our talks ready for the
beamline session on the 9
th

June.

(
ALL
)


5) Ge
neral CM15 Talks?


6
) AOB


Ken Long outlined the issues which could limit the maximum tracker
readout rate. If backgrounds were a problem, this co
uld reduce the
maximum
rate. For the present however, we should continue to aim to
furnish 600 Good muons per

second.

Yagmur would be asked to advertise our meetings and help with setting
up a MICE phone conference?. (
PD to ask YT after CM15
)


7) Next meeting


9
th

June @ FNAL!




What

Who

When

Comment

Optics for full range of emittances and
energies

(worst ca
ses in priority)


1, 6 10 pi for 200MeV/c in turtle

PD/KT to review data on web

(and link
from MICE
-
UK).

Done

240 MeV by scaling (KT) : Rates
(TJR/KW)
.
Not
yet
done


note the
240/10pi case overshoots the 5Tesla Sol
field. A new optic is needed (KT/DJA)

14
0 MeV by scaling (KT) with a scaled
spectrometer fields: 140/200*4T;
b=known (
333
) ;
This would be the first
stage, then a new optic would be needed
.

Collimation positions need to be added

Position of absorber needs to be changed?

The absorber position was

kept at B2
upstream face for the present.

Optimiser 6pi@200MeV/c : (KW)

TJR
: 10pi

1 pi is 6pi with collimation (needs G4BL)

Naming convention
: CM#
-
e
-
p,

e.g. CM14
-
1
-
200

Beam line team

Dean Adams

Kevin Tilley

VC 12 April

High Priority, must be
sure beam

line delivers
before design and
location of correctors
collimators and
magnets is fixed.

review is planned end
of April!

orbit correction and collimators

PD: positions & sizes of steering dipoles

PD: find info on CKOV1

PD: TS1 steerers?




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CR: current diameter of diffuser: 20cm
:
is this ok for 10pi?

CR:
30cm
is
better

to
understand the scraping?

Should be ok
for beam line. Could be a special plate?

It would be nice to have a position on this

by CM15.

This is

still a hot po
tato!

WL
’s
slides fro
m CM14 indicate redesign of
holder
might allow

a slight increase in
diameter?
CR/TJR should produce a

basic

analysis/case for increa
sing >
20cm
ie: what we currently ‘get’ @ 20cm, what
we loose @

20cm.
(CR/TJR

for CM15
)

W. Lau &

S. Wang

was
reviewed at
CM14.

VC in May

D
efine number of thicknesses

CR: is 6 enough?

TJR & KW also

to look
at this
?

It would be nice

to have a position
on this by CM15
.

The number of s
lots (6)
in the current design w
ould be taken as
acceptable, unless

we d
iscovered issue
s

with this latterly.


Changing the carousel
Chris Rogers

CM 15

try to see what can be
done with 5 thicknesses
and correct if needed

can of course
easily make other thickness’
available.

Validate 200 mm clear diam. for diffuser
mechanism


L
ong


CR

VC 29
March


Generate standard G4MICE files

( continue
as now generate G4BL files)

Beam line group +
Yagmur Torun

CM15

need one or two to start
with!

Investigate matching to different solenoid
fields rather than fixed 4 T

(natural
extension of
fixed field solenoid)




low priority

Understand what happens to collimated
particles
:
G4BL





Explore use of collimators, e.g., for pencil
beam
:
To be done





Explore use of ISIS target station 2
correctors


can we piggyback on their order?

No, but o
ther alternatives




Define tolerances (alignment, field strength,
field quality) for all elements

Standard beam alignment

Field quality could be measured

Build procedure needed (KW/PS/PD)




Develop optimizer for beam line design

Multiple points for fit
ting
?

Maximum field gradients (PD)

Group review at CM15




Define diagnostic needs for beam line

Ongoing:
include in b
uild
procedure





Outstanding
New
Actions from 2006
-
05
-
17 and 2006
-
05
-
31 :
-


2) Data Organisation

A data template was

proposed to hold
standard G4BL data.
Discussion suggested removing the particle ID plot, all downstream
detector plots, and include beta/alpha in Tracker 1.

It would be
reissued
. Done.
The data template should also include the 6x6
covariance matr
ix within the Tracker, and
beta &
alpha at Absorber1.

It would be reissued
again!
(KT).


A data template for Turtle data was to be issued
(KT)


3) G4BL Evaluations


-

It was suggested that thoughts could be given to looking at
TOF0 collimation in G4BL
(KW).

Also, a means of produci
ng a pencil
beam for MICE alignment could be investigated
(KW).



5) Beamline Review

-

Documentation should be made available 1week before the day
(eg
.

TRD update desirable)

(
ALL
)

-

A look at the realism of our G4BL/Turtle simulations could be
ie
.

one

example being fringe fields from elements
. (KT,KW
)