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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 monitors design and 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


Cngs secondary beam monitors design and performance

Target

 see Luca’s talk

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

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

Horn

see Stephane’s and Ans’ talk

Installation of the horn in the target chamber

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

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


Cngs secondary beam monitors design and performance

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


Cngs secondary beam monitors design and performance

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


Cngs secondary beam monitors design and performance

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


Cngs secondary beam monitors design and performance

270cm

11.25cm

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

E. Gschwendtner, CERN


Target region layout

Ionization Chambers

TBID

beam

collimator

target

horn

Target Region Layout

BPM2

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

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

BPM2

collimator

p

Horizontal Beam Scan, Target Out

BPM2

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

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

BPM2

collimator

p

Vertical Beam Scan, Target Out

BPM2

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

Intensity on TBID vs. BPM2 position BPM2

Target

BPM2

p

Horizontal Beam Scan, Target IN

BPM2

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

Target vs. Horn Alignment BPM2

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 BPM2

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 BPM2

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

E. Gschwendtner, CERN


Final alignment

coll. BPM2 =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


Horizontal angular scan target out
Horizontal Angular Scan, Target Out BPM2

E. Gschwendtner, CERN


Horizontal angular scan target out1
Horizontal Angular Scan, Target Out BPM2

E. Gschwendtner, CERN


Horn reflector timing tests
Horn/Reflector Timing Tests BPM2

horn pulse

50ms

beam

reflector pulse

50ms

beam

E. Gschwendtner, CERN


Horn reflector timing tests1
Horn/Reflector Timing Tests BPM2

E. Gschwendtner, CERN


Comparison nominal negative polarity i
Comparison Nominal-Negative Polarity I BPM2

E. Gschwendtner, CERN


Comparison nominal negative polarity ii
Comparison Nominal-Negative Polarity II BPM2

E. Gschwendtner, CERN


Comparison nominal negative polarity iii
Comparison Nominal-Negative Polarity III BPM2

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

Target Unit Tests BPM2

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


Cngs secondary beam monitors design and performance

Comparison Unit 1 and Unit 3 BPM2

Muon pit 1

Average of 2 extraction, ~1.2E13 protons

Muon pit 2

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

3. Status BPM2

Quality check – muon monitors

(example: Pit 1 - horizontal plane)

data <> Fluka

PRELIMINARY

more on Friday, 8 Sept. (Edda’s talk)

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

Comparison Meas.-Sim. I (Preliminary) BPM2

Muon Monitors, Horizontal Pit 1

■Measurement

■Simulation

Fluka simulation; P. Sala et al

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

Comparison Meas.-Sim. II (Preliminary) BPM2

Muon Monitors, Vertical Pit 1

■Measurement

■Simulation

Fluka simulation; P. Sala et al

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

Comparison Meas.-Sim. III (Preliminary) BPM2

Muon Monitors, Horizontal Pit 2

■Measurement

■Simulation

Fluka simulation; P. Sala et al

E. Gschwendtner, CERN


Cngs secondary beam monitors design and performance

Comparison Meas.-Sim. IV (Preliminary) BPM2

Muon Monitors, Vertical Pit 2

■Measurement

■Simulation

Fluka simulation; P. Sala et al

E. Gschwendtner, CERN



Muon monitor repeatability
Muon Monitor Repeatability BPM2

accuary < 1% !

E. Gschwendtner, CERN


Tbid performance
TBID Performance BPM2

E. Gschwendtner, CERN


Muon monitor linearity
Muon Monitor Linearity BPM2

4E12

1.7E13

1.1E13

1.4E13

E. Gschwendtner, CERN


Summary
Summary BPM2

  • 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