Upload
trygg
View
38
Download
0
Tags:
Embed Size (px)
DESCRIPTION
CNGS Secondary Beam Monitors: Design and Performance. Design Commissioning Performance. Secondary Beam Design and Layout. 2.7m. 43.4m. 100m. 1095m. 18m. 5m. 67m. 5m. CNGS Secondary Beam Layout. TBID/2IonCh. Cross-hair/2IonCh. Muon Detectors. IonCh: Ionization Chamber. - PowerPoint PPT Presentation
Citation preview
NBI, 8 September 2006 E. Gschwendtner, CERN 1
CNGS Secondary Beam Monitors:
Design and Performance
1. Design
2. Commissioning
3. Performance
NBI, 8 September 2006 E. Gschwendtner, CERN 2
NBI, 8 September 2006 E. Gschwendtner, CERN 3
Secondary Beam Design and Layout
NBI, 8 September 2006 E. Gschwendtner, CERN 4
43.4m100m
1095m 18m 5m 5m67m
2.7m
CNGS Secondary Beam Layout
TBID/2IonCh Muon Detectors
TBID: Target Beam Instrumentation Downstream IonCh: Ionization Chamber
Cross-hair/2IonCh
NBI, 8 September 2006 E. Gschwendtner, CERN 5Target magazine installation inside target station (25 Nov. 2005)
see Luca’s talk
Target
NBI, 8 September 2006 E. Gschwendtner, CERN 6Installation of the horn in the target chamber
Horn
see Stephane’s and Ans’ talk
NBI, 8 September 2006 E. Gschwendtner, CERN 7
Helium Tubes
NBI, 8 September 2006 E. Gschwendtner, CERN 8
Decay Tube
steel pipe 1mbar 994m long 2.45m diameter entrance window: 3mm Ti exit window: 50mm carbon steel,
water cooled
April 2004: vacuum tests ok
NBI, 8 September 2006 E. Gschwendtner, CERN 9
Shutter
Decay tube is closed with → 3mm Titanium window
Must be protected by a
‘shutter’ when access
→ Hardware Interlocked!!!
NBI, 8 September 2006 E. Gschwendtner, CERN 10
graphite
cooling modules
Hadron Stopfinished Sept. 2003
•Cooling modules: stainless steel tubes in Al blocks• Several temperature sensors (both in target chamber and in hadron stop)
Hadron Stop
NBI, 8 September 2006 E. Gschwendtner, CERN 11
Secondary Beam Instrumentation
NBI, 8 September 2006 E. Gschwendtner, CERN 12
TBID + 2 Ionization Chambers
TBID2 IonCh L/R
Purpose: Check efficiency with which protons are converted into
secondaries → Multiplicity (Compare with BFCT upstream of the target)
→ Misalignment of the Beam
2. Sec. Beam Instrumentation
NBI, 8 September 2006 E. Gschwendtner, CERN 13
TBID (Target Beam Instrumentation Downstream)
U
D
L R
L RBSPH BSPV
DUBSI BSH
BSPH Horizontal beam position
BSPHV Vertical beam position
BSIBeam intensity
BSHHalo foil .
TBID : Target Beam Instrumentation Downstream
L RU
D
BSI
Bias
Beam
TBID Monitor ● Secondary emission monitor● 12 µm Ti foils ● better than 10-4 mbar vacuum
2. Sec. Beam Instrumentation
NBI, 8 September 2006 E. Gschwendtner, CERN 14
TBID
TBID
Getter-pump
Ion-pump
NBI, 8 September 2006 E. Gschwendtner, CERN 15
TBID Monitor might not survive if high intensity beam misses the target
Ionization Chambers as back-up
SPS type BLM• N2 filled ionization chamber • Radius = 4.75 cm• Gap-width = 0.55 cm• 30 gaps• Bias: 800V-1500V
Ionization ChambersIonization Chambers in Target Chamber
NBI, 8 September 2006 E. Gschwendtner, CERN 16
Cross-Hair Monitors
beam
Cross-hair beam view(schematic)
Layout:• 4mm wide• appendix 10mm long• 20mm thick along the beam-axis•Beam 10mm off X-hair
Cross-Hairobserved by 2 IonCh L/R
NBI, 8 September 2006 E. Gschwendtner, CERN 17
Muon Monitors
Monitoring of: muon intensity muon beam profile shape muon beam profile centre
Muon intensity: Up to 7.7x107 per cm2 and 10.5µs
Dynamic range: 105
Accuracies: absolute 10 % relative 3 % reproducibility: cycle to cycle 1%,
one year 5%
NBI, 8 September 2006 E. Gschwendtner, CERN 18
Muon Monitor Layout
LHC type BLMs (Beam Loss Monitors for LHC) Parallel electrodes separated by 0.5 cm Stainless steel cylinder Al electrodes N2 gas filling at 100 mbar over pressure Diameter=8.9cm, length=60cm, 1.5 litre
37 fixed monitors (Ionization Chambers) 1 movable chamber behind fixed monitors
for relative calibration Movement by stepping motors
60cm
NBI, 8 September 2006 E. Gschwendtner, CERN 19
270cm
11.25cm
NBI, 8 September 2006 E. Gschwendtner, CERN 20
Secondary Beam Commissioning
NBI, 8 September 2006 E. Gschwendtner, CERN 21
beam
target horncollimator
Ionization Chambers
TBID
Target Region Layout
BPM2
NBI, 8 September 2006 E. Gschwendtner, CERN 22
Horizontal Beam Scan, Target Out
horizontal scan, no target
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
-8 -7.5 -7 -6.5 -6 -5.5 -5 -4.5 -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10
mm BPG412444
BLM-L
BSI1
Reading from TBID and collimator’s ionization chambers vs. BPM2
pcollimatorBPM2
BPM2
NBI, 8 September 2006 E. Gschwendtner, CERN 23
vertical scan
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
-11 -11 -10 -9.5 -9 -8.5 -8 -7.5 -7 -6.5 -6 -5.5 -5 -4.5 -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9
mm 412444
BSI1
BLM-L
Reading from TBID and collimator’s ionization chambers vs. BPM2
pcollimatorBPM2
BPM2
Vertical Beam Scan, Target Out
NBI, 8 September 2006 E. Gschwendtner, CERN 24
horizontal scan, target in original position
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
-5 -4.5 -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7mm BPG412444
no
rm B
SI
Intensity on TBID vs. BPM2 position
BPM2
pTargetBPM2
Horizontal Beam Scan, Target IN
NBI, 8 September 2006 E. Gschwendtner, CERN 25
A.E. Ball et al. SL-2001-016-EA
target vs. horn misalignment: 3 mm 10.1 cm shift in Muon Pit16 mm 19.1 cm9 mm 24.3 cm
Target vs. Horn Alignment
Pit 1 Pit 2
NBI, 8 September 2006 E. Gschwendtner, CERN 26
0.14
0.19
0.24
0.29
0.34
0.39
-112.5 -101.3 -90 -78.75 -67.5 -56.25 -45 -33.75 -22.5 -11.25 0 11.25 22.5 33.75 45 56.25 67.5 78.75 90 101.25 112.5
cm
ch
arg
es
/po
t
target aligned with beam zero
target moved by 2mm upwards
Target vs. Horn Alignment
Muon pit 1: more sensitive to target vs. horn alignment
pTargetBPM2 Horn
pTarget HornBPM2
270cm
NBI, 8 September 2006 E. Gschwendtner, CERN 27
Vertical Beam vs. Target Alignment
0.004
0.006
0.008
0.01
0.012
0.014
-158 -146 -135 -124 -113 -101 -90 -78.8 -67.5 -56.3 -45 -33.8 -22.5 -11.3 0 11.3 22.5 33.8 45 56.3 67.5 78.8 90 101 113 124 135 146 158
cm
ch
arg
es
/po
t
0.5 mm-1.5 mm1 mmnominal, 0 mm
Muon pit 2: more sensitive to beam vs. target alignment
NBI, 8 September 2006 E. Gschwendtner, CERN 28
Final Alignment
HL
R
horn
1.9 mm
target
coll. =14 mm
BPM2
VU
D
horn
1.4 mm
target
coll. =14 mm
BPM2
2 mm
target ref. system
target ref. system
beam ref. system
beam ref. system
NBI, 8 September 2006 E. Gschwendtner, CERN 29
Horizontal Angular Scan, Target Out
horizontal muon detectors pit1, target out, horn/refl off, ~ 3E11 protons
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0.04
0.045
0.05
-158 -146 -135 -124 -113 -101 -90 -78.8 -67.5 -56.3 -45 -33.8 -22.5 -11.3 0 11.25 22.5 33.75 45 56.25 67.5 78.75 90 101.3 112.5 123.8 135 146.3 157.5
cm
ch
arg
es/p
ot
0mrad
0.2mrad
0.25mrad
0.05mrad
-0.15mrad
-0.2mrad
-0.25mrad
NBI, 8 September 2006 E. Gschwendtner, CERN 30
Horizontal Angular Scan, Target Out
vertical muon detectors pit1, target out, horn/refl off, ~3E11 protons
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0.04
0.045
0.05
-158 -146 -135 -124 -113 -101 -90 -78.8 -67.5 -56.3 -45 -33.8 -22.5 -11.3 0 11.25 22.5 33.75 45 56.25 67.5 78.75 90 101.3 112.5 123.8 135 146.3 157.5
cm
ch
arg
es/p
ot
0 mrad
0.2 mrad
0.25 mrad
0.05 mrad
-0.15 mrad
-0.2 mrad
-0.25 mrad
NBI, 8 September 2006 E. Gschwendtner, CERN 31
Horn/Reflector Timing Tests
beam
beam
horn pulse
reflector pulse
50ms
50ms
NBI, 8 September 2006 E. Gschwendtner, CERN 32
Horn/Reflector Timing Tests
timing tests horn/reflector
0
0.5
1
1.5
2
2.5
3
3.5
4
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4ms
cen
tral
mu
on
mo
nit
or
(ch
arg
es/p
ot)
horn on/refl on
horn on/refl off
horn off/refl on
Poly. (horn on/refl on)
Poly. (horn on/refl off)
Poly. (horn off/refl on)
10E-1
NBI, 8 September 2006 E. Gschwendtner, CERN 33
Comparison Nominal-Negative Polarity Ihorizontal pit1
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
-157.5 -146.3 -135 -123.8 -112.5 -101.3 -90 -78.75 -67.5 -56.25 -45 -33.75 -22.5 -11.25 0 11.25 22.5 33.75 45 56.25 67.5 78.75 90 101.25
112.5 123.75
135 146.25
157.5
cm
char
ges/
pot
nominal polarity
neg. polarity
NBI, 8 September 2006 E. Gschwendtner, CERN 34
Comparison Nominal-Negative Polarity IIvertical pit1
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
-157.5 -146.3 -135 -123.8 -112.5 -101.3 -90 -78.75 -67.5 -56.25 -45 -33.75 -22.5 -11.25 0 11.25 22.5 33.75 45 56.25 67.5 78.75 90 101.25 112.5 123.75 135 146.25 157.5
cm
char
ges/
pot
nominal polarity
neg. polarity
NBI, 8 September 2006 E. Gschwendtner, CERN 35
Comparison Nominal-Negative Polarity III
horizontal pit2
0.002
0.003
0.004
0.005
0.006
0.007
0.008
0.009
0.01
0.011
0.012
-157.5 -146.3 -135 -123.8 -112.5 -101.3 -90 -78.75 -67.5 -56.25 -45 -33.75 -22.5 -11.25 0 11.25 22.5 33.75 45 56.25 67.5 78.75 90 101.3 112.5 123.8 135 146.3 157.5
cm
charg
es/po
t
nominal polarity
neg. polarity
vertical pit2
0.002
0.003
0.004
0.005
0.006
0.007
0.008
0.009
0.01
0.011
0.012
-157.5 -146.3 -135 -123.8 -112.5 -101.3 -90 -78.75 -67.5 -56.25 -45 -33.75 -22.5 -11.25 0 11.25 22.5 33.75 45 56.25 67.5 78.75 90 101.3 112.5 123.8 135 146.3 157.5
cm
charg
es/po
t
nominal polarity
neg. polarity
NBI, 8 September 2006 E. Gschwendtner, CERN 36
unit 1 : polycrystalline graphite by Carbone-Lorraine 2020 PT density 1.76 g/cm3
unit 3: carbon-carbon composite by Carbone-Lorraine A035 density >1.75 g/cm3
Target Unit Tests
NBI, 8 September 2006 E. Gschwendtner, CERN 37
comparison target unit 1 and unit 3, average of 2 extractions, ~1.2E13 pot, hp1
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
-157.5 -135 -112.5 -90 -67.5 -45 -22.5 0 22.5 45 67.5 90 112.5 135 157.5cm
ch
arg
es
/po
t
unit 1
unit 3
comparison target unit 1 and unit 3, average of 2 extractions, ~1.2E13 pot, hp2
0
0.002
0.004
0.006
0.008
0.01
0.012
-157.5 -135 -112.5 -90 -67.5 -45 -22.5 0 22.5 45 67.5 90 112.5 135 157.5
unit 1
unit 3
Comparison Unit 1 and Unit 3
Muon pit 1
Muon pit 2
Average of 2 extraction, ~1.2E13 protons
NBI, 8 September 2006 E. Gschwendtner, CERN 38
PRELIMINARYmore on Friday, 8 Sept. (Edda’s talk)
Quality check – muon monitors(example: Pit 1 - horizontal plane)
data <> Fluka
3. Status
NBI, 8 September 2006 E. Gschwendtner, CERN 39
comparison measurement-simulation, horizontal pit1
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
-157.5 -146.3 -135 -123.8 -112.5 -101.3 -90 -78.75 -67.5 -56.25 -45 -33.75 -22.5 -11.25 0 11.25 22.5 33.75 45 56.25 67.5 78.75 90 101.25
112.5 123.75
135 146.25
157.5
cm
char
ges
/po
t
meas: nominal
sim: nominal
Comparison Meas.-Sim. I (Preliminary)
Muon Monitors, Horizontal Pit 1
■ Measurement■ Simulation
Fluka simulation; P. Sala et al
NBI, 8 September 2006 E. Gschwendtner, CERN 40
comparison measurement-simulation, vertical pit1
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
-157.5 -146.3 -135 -123.8 -112.5 -101.3 -90 -78.75 -67.5 -56.25 -45 -33.75 -22.5 -11.25 0 11.25 22.5 33.75 45 56.25 67.5 78.75 90 101.25
112.5 123.75
135 146.25
157.5
cm
char
ges
/po
t
meas: nominal
sim: nominal
Comparison Meas.-Sim. II (Preliminary)
Muon Monitors, Vertical Pit 1
■ Measurement■ Simulation
Fluka simulation; P. Sala et al
NBI, 8 September 2006 E. Gschwendtner, CERN 41
comparison measurement-simulation, horizontal pit2
0.002
0.003
0.004
0.005
0.006
0.007
0.008
0.009
0.01
0.011
0.012
-168.8
-157.5
-146.3
-135 -123.8
-112.5
-101.3
-90 -78.75
-67.5 -56.25
-45 -33.75
-22.5 -11.25
0 11.25 22.5 33.75 45 56.25 67.5 78.75 90 101.3 112.5 123.8 135 146.3 157.5 168.8
cm
char
ges
/po
t
meas: nominal
sim: nominal
Comparison Meas.-Sim. III (Preliminary)
Muon Monitors, Horizontal Pit 2
■ Measurement■ Simulation
Fluka simulation; P. Sala et al
NBI, 8 September 2006 E. Gschwendtner, CERN 42
comparison measurement-simulation, vertical pit2
0.002
0.003
0.004
0.005
0.006
0.007
0.008
0.009
0.01
0.011
0.012
-168.8
-157.5
-146.3
-135 -123.8
-112.5
-101.3
-90 -78.75
-67.5 -56.25
-45 -33.75
-22.5 -11.25
0 11.25 22.5 33.75 45 56.25 67.5 78.75 90 101.3 112.5 123.8 135 146.3 157.5 168.8
cm
char
ges
/po
t
meas: nominal
sim: nominal
Comparison Meas.-Sim. IV (Preliminary)
Muon Monitors, Vertical Pit 2
■ Measurement■ Simulation
Fluka simulation; P. Sala et al
NBI, 8 September 2006 E. Gschwendtner, CERN 43
Secondary Beam Instrumentation Performance during Operation
NBI, 8 September 2006 E. Gschwendtner, CERN 44
Muon Monitor Repeatability
average muon monitor signal, ~1.5E12 protons, horizontal pit1
0.16
0.18
0.2
0.22
0.24
0.26
0.28
0.3
0.32
0.34
0.36
-150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
cm
char
ges/
pot
accuary < 1% !
NBI, 8 September 2006 E. Gschwendtner, CERN 45
TBID Performance
12
15
18
21
24
27
30
8/18/20060:00:00
8/19/20060:00:00
8/20/20060:00:00
8/21/20060:00:00
8/22/20060:00:00
8/23/20060:00:00
8/24/20060:00:00
8/25/20060:00:00
8/26/20060:00:00
8/27/20060:00:00
8/28/20060:00:00
8/29/20060:00:00
date
mu
ltip
lic
ity
0.00000001
0.0000001
0.000001
0.00001
0.0001
mb
ar
an
d c
ha
rge
s/p
ot/
10
00
multiplicity
TBID vacuum [mbar]
Ionization Chamber @ TBID * 1E-3
NBI, 8 September 2006 E. Gschwendtner, CERN 46
0.328
0.33
0.332
0.334
0.336
0.338
0.34
0.342
0.344
0.346
0.348
2E+12 3E+12 4E+12 5E+12 6E+12 7E+12 8E+12 9E+12 1E+13 1E+13 1E+13 1E+13 1E+13 2E+13 2E+13 2E+13 2E+13
proton on target/extraction
ch
arg
es/p
ot
(cen
tr. d
et.
pit
1)
0.002
0.004
0.006
0.008
0.01
0.012
0.014
0.016
0.018
0.02
0.022
ch
arg
es/p
ot
(cen
tr. d
et.
pit
2)
central detector pit1
central detector pit2
Muon Monitor Linearity
1.4E13 1.7E134E12 1.1E13
NBI, 8 September 2006 E. Gschwendtner, CERN 47
Summary
Detailed hardware commissioning ‘Dry runs’ paid off!
Hardly any problems with the control system Secondary beam line has been successfully commissioned
CNGS is operational
Now operational work starts: Performance studies, Systematics, etc………