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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.

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cngs secondary beam monitors design and performance
CNGS Secondary Beam Monitors: Design and Performance
  • Design
  • Commissioning
  • Performance

E. Gschwendtner, CERN

cngs secondary beam 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

TBID: Target Beam Instrumentation Downstream

E. Gschwendtner, CERN

slide5

Target

 see Luca’s talk

Target magazine installation inside target station (25 Nov. 2005)

E. Gschwendtner, CERN

slide6

Horn

see Stephane’s and Ans’ talk

Installation of the horn in the target chamber

E. Gschwendtner, CERN

slide7

Helium Tubes

E. Gschwendtner, CERN

decay tube
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

E. Gschwendtner, CERN

shutter
Shutter

Decay tube is closed with

→3mm Titanium window

Mustbe protected by a ‘shutter’ when access

→ Hardware Interlocked!!!

E. Gschwendtner, CERN

slide10

Hadron Stop

graphite

cooling modules

  • Cooling modules: stainless steel tubes in Al blocks
  • Several temperature sensors (both in target chamber and in hadron stop)

Hadron Stop

finished Sept. 2003

E. Gschwendtner, CERN

slide11
Secondary Beam Instrumentation

E. Gschwendtner, CERN

tbid 2 ionization chambers

TBID

2 IonCh L/R

TBID + 2 Ionization Chambers

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

E. Gschwendtner, CERN

tbid target beam instrumentation downstream
TBID (Target Beam Instrumentation Downstream)

TBID Monitor

● Secondary emission monitor

● 12 µm Ti foils

● better than 10-4 mbar vacuum

2. Sec. Beam Instrumentation

E. Gschwendtner, CERN

slide14

TBID

Getter-pump

Ion-pump

TBID

E. Gschwendtner, CERN

ionization chambers in target chamber

Ionization Chambers

Ionization Chambers in Target Chamber

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

E. Gschwendtner, CERN

cross hair

beam

Cross-hair beam view

(schematic)

Monitors

Cross-Hair
  • Layout:
  • 4mm wide
  • appendix 10mm long
  • 20mm thick along the beam-axis
  • Beam 10mm off X-hair

Cross-Hair

observed by 2 IonCh L/R

E. Gschwendtner, CERN

muon monitors
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%

E. Gschwendtner, CERN

muon monitor layout
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

60cm

  • 37 fixed monitors (Ionization Chambers)
  • 1 movable chamber behind fixed monitors for relative calibration
  • Movement by stepping motors

E. Gschwendtner, CERN

slide19

270cm

11.25cm

E. Gschwendtner, CERN

slide20
Secondary Beam Commissioning

E. Gschwendtner, CERN

target region layout

Ionization Chambers

TBID

beam

collimator

target

horn

Target Region Layout

BPM2

E. Gschwendtner, CERN

slide22

Reading from TBID and collimator’s ionization chambers vs. BPM2

BPM2

collimator

p

Horizontal Beam Scan, Target Out

BPM2

E. Gschwendtner, CERN

slide23

Reading from TBID and collimator’s ionization chambers vs. BPM2

BPM2

collimator

p

Vertical Beam Scan, Target Out

BPM2

E. Gschwendtner, CERN

slide24

Intensity on TBID vs. BPM2 position

Target

BPM2

p

Horizontal Beam Scan, Target IN

BPM2

E. Gschwendtner, CERN

slide25

Target vs. Horn Alignment

A.E. Ball et al. SL-2001-016-EA

Pit 2

Pit 1

target vs. horn misalignment: 3 mm  10.1 cm shift in Muon Pit1

6 mm  19.1 cm

9 mm  24.3 cm

E. Gschwendtner, CERN

target vs horn alignment
Target vs. Horn Alignment

Muon pit 1: more sensitive to target vs. horn alignment

270cm

BPM2

Target

Horn

p

BPM2

Horn

Target

p

E. Gschwendtner, CERN

vertical beam vs target alignment
Vertical Beam vs. Target Alignment

Muon pit 2: more sensitive to beam vs. target alignment

E. Gschwendtner, CERN

final alignment

coll.  =14 mm

BPM2

target

horn

H

L

1.9 mm

R

coll.  =14 mm

BPM2

target

horn

V

U

1.4 mm

2 mm

D

Final Alignment

target ref. system

beam ref. system

beam ref. system

target ref. system

E. Gschwendtner, CERN

horn reflector timing tests
Horn/Reflector Timing Tests

horn pulse

50ms

beam

reflector pulse

50ms

beam

E. Gschwendtner, CERN

horn reflector timing tests1
Horn/Reflector Timing Tests

E. Gschwendtner, CERN

slide36

Target Unit Tests

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

E. Gschwendtner, CERN

slide37

Comparison Unit 1 and Unit 3

Muon pit 1

Average of 2 extraction, ~1.2E13 protons

Muon pit 2

E. Gschwendtner, CERN

slide38

3. Status

Quality check – muon monitors

(example: Pit 1 - horizontal plane)

data <> Fluka

PRELIMINARY

more on Friday, 8 Sept. (Edda’s talk)

E. Gschwendtner, CERN

slide39

Comparison Meas.-Sim. I (Preliminary)

Muon Monitors, Horizontal Pit 1

■Measurement

■Simulation

Fluka simulation; P. Sala et al

E. Gschwendtner, CERN

slide40

Comparison Meas.-Sim. II (Preliminary)

Muon Monitors, Vertical Pit 1

■Measurement

■Simulation

Fluka simulation; P. Sala et al

E. Gschwendtner, CERN

slide41

Comparison Meas.-Sim. III (Preliminary)

Muon Monitors, Horizontal Pit 2

■Measurement

■Simulation

Fluka simulation; P. Sala et al

E. Gschwendtner, CERN

slide42

Comparison Meas.-Sim. IV (Preliminary)

Muon Monitors, Vertical Pit 2

■Measurement

■Simulation

Fluka simulation; P. Sala et al

E. Gschwendtner, CERN

muon monitor repeatability
Muon Monitor Repeatability

accuary < 1% !

E. Gschwendtner, CERN

tbid performance
TBID Performance

E. Gschwendtner, CERN

muon monitor linearity
Muon Monitor Linearity

4E12

1.7E13

1.1E13

1.4E13

E. Gschwendtner, CERN

summary
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………

E. Gschwendtner, CERN

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