Collimation system upgrade and

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15 Νοε 2013 (πριν από 3 χρόνια και 6 μήνες)

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Collimation system upgrade and
present

CERN plan for Hi
-
Lumi

Lucio Rossi

(
slides

from

R. Assmann, S. Myers, JP Tock)

1st CERN
-
FNAL collaboration meeting on 11 T

LHC Collimation as Staged System


LHC collimation was conceived in 2003 as a
staged system
.


Phase 1:


For
initial beam commissioning and early years
of LHC operation.


Not adequate for nominal and ultimate intensity
.


Designed, constructed and commissioned 2003


2009.


Phase 2:


Upgrade for nominal, ultimate and higher beam intensities
.


Issues in
efficiency, impedance and radiation impact
.


Originally not clear what the solution would be.


By now
various upgrade solutions
worked out and under design.


IR upgrade:


Adaptation to changes in
IR upgrades: space and losses
.


Adaptation to
phase space modifications
(ATS, crab cavities).

13 May 2011

LRossi@FNAL

0.5 A

0.86A

2

LHC
recap

13 May 2011

3

LRossi@FNAL

Overall Collimation Plan

13 May 2011

Initial collimation system

(2009


2012)

Inefficiency: 0.02 %

b
* ~ 1


1.5 m, 3.5
TeV

R2E limits in IR7?

> 4 days per setup

Full collimation system

(2018 onwards)

Inefficiency: 0.0004 %

b
* ~ 0.55 m, 7
TeV

L not limited

30 s per setup

Radiation optimization

Interim

collimation system

(2014


2016)

Inefficiency: 0.002 %

b
* ~ 1


2 m, 7
TeV

Gain ~100 in R2E (IR7

IR3
)

L ≤
5

×

10
33

cm
-
2

s
-
1


> 2 days per setup

2013 shutdown: IR3 DS

combined cleaning, IR2
TCT’s,

TCLP
installation
?

2017 shutdown:

IR(1)/2/(5)/7 DS

BPM in coll.

Radiation opt.

TCT’s for IR6?

Collimation IR Upgrade
(2022 onwards)

Low
b
*, 7
TeV

TCT’s integrated into IR upgrade

Compatibility with crab cavities

2021

shutdown:

tbd

LRossi@FNAL

4

13 May 2011



Overview

Relayout

and Integration

LRossi@FNAL

DFBA

Q7

Q10

Q11

CC

Q8

Q9

Q10

Q8

Q9

DFBA

Q7

Q11

CC

Tunnel side / QRL

Q11

CC’

L’ = L


4.5 m

= 9.217 m

Tunnel side / QRL

DFBA

Q7


4.5 m.

Q10

4.5 m.

Q9

Q8

46 mm

L = 4.5 m

L 4.5 m

5
/31

JPh Tock TE/MSC
-
CI

Two

collimators

(one per
beam
) on
each

side

of Point 3

FORMER Rough Draft 10 year plan

13 May 2011

6

LRossi@FNAL

BUT! New analysis

13 May 2011

7

LRossi@FNAL

So
what

to do?


Collimation
review

on
June

14
-
15
at

CERN to
decide

if go
ahead

or not
for DS in Pont 3.


There
will

be

a
preliminary

review

assessing

th
risk

of
m
oving

so

many

cold
elements

in LHC.


In
any

case the
availability

of the 11 T
successful

Twin

model
is

«

primordial

».


For the moment
it

is

the «

desired

»
tools

for P7, IP2, IP1 and IP5,
while

P3
will

be

done

by
removing

magnets

(last
MDs

shows
apparently

we

can

run

at

I
nom

without

upgrading

DS P3…
under

analysis
)


The
coupling

with

Cryocollimator

may

even

reduce

by a factor 2 the
need

of
collimators


What

appears

sure
is

P3, P7 and P2 (
half
?).


The Collimation upgrade
depends

strongly

on the LHC
behaviour
: but
SC
Magnets

R&D
is

long, and
cannot

depend

on last news
.

So
we

need

to have
our

plan and
firmly

go
ahead

till the 5.5 m
Twin
.

13 May 2011

9

LRossi@FNAL

Coupling

with

other

element


CERN
accelerator

new
project

have been
orgnanised

into

4
projects


LHC consolidation : Simon Baird


LIU (LHC
Injector

Upgrade) : Roland Garoby


HL
-
LHC (High
Luminosity

LHC): Lucio Rossi


Linear

Collider

Project: Steiner Stapnes

13 May 2011

LRossi@FNAL

10

HL
-
LHC

13 May 2011

LRossi@FNAL

11

WP1 Project Management and Technical Coordination

WP2 Accelerator Physics and
Performance

WP3 Magnet
Design

WP5 IR
Collimation

WP6 Cold
Powering

WP4 Crab
Cavities

HiLumi LHC

WP
7

Machine

Protection

WP
8

Collider
-
Experiment

Interface

WP
9

Cryogenics

WP
10

Energy

Deposition

and

shielding

WP
11

11

tesla

dipole

two
-
in
-
one

WP
12

Integration

&

(de)installation

Non
-
HiLumi

LHC

HL
-
LHC Design Study

To HL are
attached

also
:

-
Collimator

(
not
only

the
inthe

High
lumi

insertion)

-
Vacuum, diagnostics,
etc


-
High Field
Magnet

-
HE
-
LHC
studies