Tuning-based FFS designs from 380 GeV to 3 TeV - Indico

Transcription

Introduction
CLIC 380 GeV designs
CLIC 3 TeV designs
CLIC BDS Rebaselining study and Alternative designs at
top energy
Tuning-based FFS designs from 380 GeV to 3 TeV
Fabien Plassard1,2 , Rogelio Tomás García 1 , Eduardo Marin 1 ,
Ryan Bodenstein 3 , Hector Garcia Morales 1
1 CERN, Switzerland, Geneva 2 Université Paris Sud, France, Orsay
3 JAI, Oxford University, UK, Oxford
November 4th 2016
CLIC Implementation Meeting : BDS
F. Plassard CERN/ Uni. Paris Sud
CLIC Implementation meeting
November 4th 2016
1 / 15
Introduction
CLIC 3 TeV designs
OUTLINES
1
2
3
Introduction
√
Status of the CLIC s = 380 GeV BDS design
Tuning : increasing FFS dispersion
Parameters & Performances
Conclusions and plans for the first stage
√
Alternative BDS designs for CLIC s = 3 TeV
Final Focus System : Traditional vs Local
Longer FFS with Local correction
November 4th 2016
2 / 15
Introduction
CLIC 3 TeV designs
Introduction
Goal : improving the tuning efficiency by changes in the FFS design
The main changes currently explored are :
Changes in Bending Magnet angles
Changes in FFS length
Changes scheme : Traditional FFS
November 4th 2016
3 / 15
Introduction
CLIC 3 TeV designs
CLIC 380 GeV : Improvement of tuning with dispersion scan
Sext. strength (SD0,SF1,SD4) [%]
0.1
0
ηx [m]
-0.1
-0.2
-0.3
-0.4
-0.5 ηx increased up to +100%
0
Machines [%]
80
Machines that reach L0 [%]
L ∗ =4.3m (1st iteration)
100
disp. +0%
disp. +10%
disp. +20%
disp. +30%
disp. +40%
disp. +50%
disp. +60%
disp. +70%
disp. +80%
disp. +90%
disp. +100%
60
40
20
0
0
100 200 300 400 500
s [m]
20
40
60
L/L0 [%]
100
120
140
Average sext. strength
90
80
70
60
50
0 10 20 30 40 50 60 70 80 90 100
Dispersion ηx increase [%]
100
90
80
70
60
50
40
30
20
10
0
o
100% of L0
0
80
100
10 20 30 40 50 60 70 80 90 100
Dispersion ηx increase [%]
* CDR-like errors considered in tuning simulation
November 4th 2016
4 / 15
Introduction
CLIC 3 TeV designs
CLIC BDS 380 GeV : Parameters & Performances
Tuning-based optimal lattice (dispersion increased by 60%)
CLIC energy
L∗ [m]
FFS length [m]
γx /γy [nm]
∗
βx
/βy∗ [mm]
∗
∗
σx
(σx,design
) [nm]
∗
σy∗ (σy,design
) [nm]
Ltot (Ltot, design ) [1034 cm−2 s−1 ]
L1% (L1%, design ) [1034 cm−2 s−1 ]
Chrom. ξy (L∗ /βy∗ )
Final Focus System
√βx
√βy
√ηx
0.4
0.3
0.2
400
0.1
300
0
-0.1
200
-0.2
100
-0.3
-0.4
0
0
100
200
300
s [m]
400
500
Luminosity [1034cm-2s-1]
βy,x1/2 [m1/2]
500
0.5
ηx [m]
600
380 GeV
4.3
553
950 / 20
8.2 / 0.1
147.3 (145)
2.5 (2.3)
1.9 (1.5) +27%
1.18 (0.9) +30%
43000
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
Total luminosity LTOT
Peak luminosity L1%
CLIC BDS 380 GeV optimized
-1
-0.5
0
0.5
1
Momentum deviation dp [%]
November 4th 2016
5 / 15
Introduction
CLIC 3 TeV designs
Tuning performances for CLIC 380 GeV
100
Tuning of the CLIC 380GeV FFS L ∗ =4.3m
Machines [%]
80
90% of the machines reach
110% of L0 with 2 knob
scans
60
2 knob scans ≈ 1400
Luminosity measurements
40
20
0
0
1st iteration, dispersion optimized (+60%)
2nd iteration
3rd iteration
20
40
60
80
L/L0 [%]
100
120
140
Increasing dispersion by changing bending magnet angles works well at
low energy
More imperfections (magnet strength errors + roll errors) should be added
in the simulation to conclude on the feasibility of the design (ongoing)
November 4th 2016
6 / 15
Introduction
CLIC 3 TeV designs
CLIC 3 TeV FFS : Traditional vs Local
Local vs Traditional performances in Hector’s paper PhysRevSTAB.17.101001
Move to Traditional scheme to ease the tuning
Traditional
Local
November 4th 2016
7 / 15
Introduction
CLIC 3 TeV designs
Traditional tuning performances
4th knob scan comparison between Local and Traditional FFS scheme
Local : 35% of the machines that reach 90%L0
Tradtional : 57% of the machines that reach 90%L0
Tuning of the CLIC 3TeV FFS LOCAL vs TRADITIONAL
100
Machines [%]
80
60
40
20
0
0
BBA + KNOBS 4th iter. TRADITIONAL
BBA + KNOBS 4th iter. LOCAL
20
40
60
80
L/L0 [%]
100
120
140
November 4th 2016
8 / 15
Introduction
CLIC 3 TeV designs
At 3 TeV, increasing dispersion with bending magnets is strongly limited by
Synchrotron Radiation
⇒ the window to increase dispersion is too small to significantly reduce k2
0.04
14
13
12
11
10
9
8
7
6
5
4
3
Avg. ηsext.
x
Avg. sext. strength
ηx,avg [m]
0.035
0.03
0.025
0.02
0.015
500
600
700
800
FFS length [m]
k2,avg [m-2]
Alternatively, one can increase the length of the FFS in order to increase
dispersion (reduce k2 )
900
November 4th 2016
9 / 15
Introduction
CLIC 3 TeV designs
At 3 TeV, increasing dispersion with bending magnets is strongly limited by
Synchrotron Radiation
⇒ the window to increase dispersion is too small to significantly reduce k2
0.04
14
13
12
11
10
9
8
7
6
5
4
3
Avg. ηsext.
x
Avg. sext. strength
ηx,avg [m]
0.035
0.03
0.025
0.02
0.015
500
600
700
800
FFS length [m]
k2,avg [m-2]
Alternatively, one can increase the length of the FFS in order to increase
dispersion (reduce k2 )
900
November 4th 2016
10 / 15
Introduction
CLIC 3 TeV designs
Tuning performances comparison
0.02
ηx [m]
0
-0.02
ηx (FFSx1)
ηx (FFSx1.5)
-0.04
-0.06
0
50 100 150 200 250 300 350 400 450 500 550 600 650 700
s [m]
Tuning
of the CLIC 3TeV FFS L ∗ =3.5m (length comparison)
100
BBA+KNOBS 1st iter. (FFS x 1)
BBA+KNOBS 1st iter. (FFS x 1.53)
Improvement of the the tuning
performance with longer FFS
Further studies are needed to
identify the limitations and find the
optimal Tuning-based lattice length
Machines [%]
80
60
40
20
0
0
20
40
60
80
L/L0 [%]
100
November 4
120
th
2016
140
11 / 15
Introduction
CLIC 3 TeV designs
Long L∗ FFS to ease MDI
November 4th 2016
12 / 15
Introduction
CLIC energy
L∗ [m]
FFS length [m]
γx /γy [nm]
βx∗ /βy∗ [mm]
∗
σx∗ (σx,design
) [nm]
∗
σy∗ (σy,design
) [nm]
L1% (L1%, design ) [1034 cm−2 s−1 ]
0.04
IP
80
L/L0 [%]
100
120
ηx (L* = 3.5 m)
-0.08
0
150
300
450
s [m]
600
750
Tuning of the CLIC 3TeV FFS with L ∗ =6m
60
40
20
60
ηx (L* = 6 m)
-0.06
Machines [%]
20
40
-0.02
80
40
20
IP
0
-0.04
100
60
0
0
Final Focus System CLIC 3 TeV
0.02
BBA + KNOBS 1st iteration
BBA + KNOBS 2nd iteration
BBA + KNOBS 3rd iteration
BBA + KNOBS 4th iteration
80
Machines [%]
3TeV
6
770
660 / 20
7 / 0.12
49.4 (40)
1.9 (1)
6.4 (5.9)
2.1 (2)
50000
Tuning of the CLIC 3TeV FFS with L ∗ =3.5m
100
CLIC 3 TeV designs
performances summary
ηx [m]
Long
L∗
140
0
0
BBA+KNOBS 1st iter
KNOBS 2nd iter
KNOBS 3rd iter
KNOBS 4th iter
20
40
60
L/L0 [%]
80
November 4
100
th
120
2016
13 / 15
Introduction
CLIC 3 TeV designs
performances summary
CLIC energy
L∗ [m]
FFS length [m]
γx /γy [nm]
βx∗ /βy∗ [mm]
∗
σx∗ (σx,design
) [nm]
∗
σy∗ (σy,design
) [nm]
L1% (L1%, design ) [1034 cm−2 s−1 ]
3TeV
6
770
660 / 20
7 / 0.12
49.4 (40)
1.9 (1)
6.4 (5.9)
2.1 (2)
50000
0.04
IP
Long L∗ tuning results shows the
need of a longer FFS to improve
tuning efficiency
-0.02
ηx (L* = 6 m)
-0.06
ηx (L* = 3.5 m)
-0.08
0
100
150
300
450
s [m]
600
750
Tuning of the CLIC 3TeV FFS with L ∗ =6m
80
Machines [%]
6th iter. : 80% of machines reach L0
IP
0
-0.04
FFS scaled with L∗
With longer L∗ the nominal
luminosity is reduced but the tuning
is easier thanks to weaker
sextupoles
Final Focus System CLIC 3 TeV
0.02
ηx [m]
Long
L∗
60
40
20
0
0
BBA+KNOBS 1st iter
KNOBS 2nd iter
KNOBS 3rd iter
KNOBS 4th iter
KNOBS 5th iter
KNOBS 6th iter
KNOBS 7th iter
20
40
60
L/L0 [%]
80
100
November 4
th
120
2016
14 / 15
Introduction
CLIC 3 TeV designs
Summary
Tuning-based dispersion optimization with changes in bending angles
have been performed at 380 GeV
Longer FFS with Local correction is being studied and first results have
shown its benefits on tuning
An alternative design is under study to reduce the effect of the solenoid on
luminosity and ease MDI ⇒ Long L∗ FFS
Energy [TeV]
0.38
3
Scheme
Local
Local (nominal)
Longer Local (x1.5)
Local L∗ = 6 m
Traditional
Algorithm
(BBA + Knobs)x 1
(BBA + Knobs)x 1
(BBA + Knobs)x 1
(BBA + Knobs)x 1
(BBA + Knobs)x1
L0 [%] (90% seeds)
90
15
30
27
22
November 4th 2016
15 / 15

Tuning-based FFS designs from 380 GeV to 3 TeV - Indico

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