Markus KöhliPhysikalisches Institut (LCTPC)

RheinischeFriedrich-Wilhelms-UniversitätBonn

F. P. Schmidt, M.Gruber J. Kaminski, K. Desch

High Resolution Neutron Detectionby the (y)TPC method

International Workshop on Position Sensitive Neutron Detectors 201817.05.2018

1

[1] http://www-alice.gsi.de

Jalousie (Powtex) CASCADE (Reseda/Mira)

- ToF Diffractometer - - Spin Echo-

Physikalisches InstitutRuprecht-Karls-UniversitätHeidelberg

The Time Projection Chamber2

[1] http://www-alice.gsi.de

2

ReadoutE-Field

[1] http://www-alice.gsi.de

The Time Projection Chamber

The Neutron TPC Trigger3

Neutron

The Neutron TPC Trigger3

Neutron

The Neutron TPC Trigger3

Neutron

Trigger

Track

&

The Neutron TPC4

(not to scale)

The Neutron TPC4

(not to scale)

The Neutron TPC4

(not to scale)

The Neutron TPC4

(not to scale)

The Detector

The Neutron TPC5

The Neutron TPC: BODELAIRE5

Field Cage Design6

Boron Carbide Boron Nitride Boron

Reflector

Scintillator

Lightguide

Reflector

Field Cage Design6

Boron Carbide Boron Nitride Boron

Reflector

Scintillator

Lightguide

Reflector

Simulation: Electric Field Homogeneity

The TimePix Chip7

The TimePix Chip7

- 256 × 256 pixels @ 55 × 55 μm²- 1.4 × 1.4 cm²- 40 MHz clock- ENC ca. 90 e-

The TimePix Chip7

- 256 × 256 pixels @ 55 × 55 μm²- 1.4 × 1.4 cm²- 40 MHz clock- ENC ca. 90 e-

The TimePix Chip7

- 256 × 256 pixels @ 55 × 55 μm²- 1.4 × 1.4 cm²- 40 MHz clock- ENC ca. 90 e-

The TimePix Chip7

- 256 × 256 pixels @ 55 × 55 μm²- 1.4 × 1.4 cm²- 40 MHz clock- ENC ca. 90 e-

Modes:- Time Over Threshold (TOT)- Time of Arrival (ToA)- Geiger Counter

The TimePix Chip7

- 256 × 256 pixels @ 55 × 55 μm²- 1.4 × 1.4 cm²- 40 MHz clock- ENC ca. 90 e-

Modes:- Time Over Threshold (TOT)- Time of Arrival (ToA)- Geiger Counter

TimePix Readout System8

Scalable Readout System

Hybrid HDMI cable Adapter card + FEC Ethernet Switch Ethernet PC

SRU

or

TimePix Readout System8

Scalable Readout System

Hybrid HDMI cable Adapter card + FEC Ethernet Switch Ethernet PC

SRU

or

TimePix Readout System8

Scalable Readout System

Hybrid HDMI cable Adapter card + FEC Ethernet Switch Ethernet PC

SRU

or

TimePix Readout System8

Scalable Readout Unit

Virtex-6

10 GbE SFP+

40x DDTC from FECs

FECv6 (2013)

1 GbE or DDTC to SRU

Virtex-6

TimePix Readout System8

Scalable Readout Unit

Virtex-6

10 GbE SFP+

40x DDTC from FECs

FECv6 (2013)

1 GbE or DDTC to SRU

Front-end ASICS implemented in SRS:• APV25, • VFAT, • Timepix, • Beetle, • [Timepix3], • [VMM3]

Virtex-6

1 GbE or DDTC to SRU

TimePix Readout System8

Scalable Readout Unit

Virtex-6

10 GbE SFP+

40x DDTC from FECs

FECv6 (2013)

Front-end ASICS implemented in SRS:• APV25, • VFAT, • Timepix, • Beetle, • [Timepix3], • [VMM3]

Virtex-6

[1] Detection and imaging of high-Z materials with a muon tomography station using GEM detectors Gnanvo, K., et al. Nuclear Science Symposium Conference Record (NSS/MIC), 2010 IEEE. IEEE, 2010.

[1]

TimePix Readout System9

[1] M. Lupberger, The Pixel-TPC – A feasibility study, Thesis 2016[2] H. Muller, RD51 SRS Status December 2016, CERN

TimePix Readout System9

[1] M. Lupberger, The Pixel-TPC – A feasibility study, Thesis 2016[2] H. Muller, RD51 SRS Status December 2016, CERN

Octoboard:

TimePix Readout System9

[1] M. Lupberger, The Pixel-TPC – A feasibility study, Thesis 2016[2] H. Muller, RD51 SRS Status December 2016, CERN

Octoboard:

LCTPC Event Display10

[1] http://newsline.linearcollider.org

[1]

Detecting Neutrons

Test Detector11

Test Detector11

Test Detector11

μTPC

Track Topology12

Pitch: 1.56 mmSiemsens Star Resolution: 1.4 mm

12

Sim:Li

Sim:He

Track Topology

Neutron Conversion Tracks13

Neutron Conversion Tracks13

5-23 % Time Pixel (Random Pattern)

Event Example: Lithium14

Spatial Projection

Time Projection

Event Example: Helium15

Spatial Projection Time Projection

Analysis and Results

Energy Loss in Gas16

Energy Loss in Gas16

Sim:Li

Sim:He

Energy Loss in Gas16

Li

He

Spatial Projection

Sim:Li

Sim:He

Energy Spectrum17

Charge [MeV]

Charge [MeV]

Folded with 25 % FWHM

Simulation: 1 μm Layer of Boron

Li

He

Energy Spectrum17

Charge [MeV]

Charge [MeV]

Folded with 25 % FWHM

TOT Spectrum (fiducialized)

Li

He

Simulation: 1 μm Layer of Boron

Spatial Resolution18

Boron Sheet

Drift Gap: 3.8 cm

Spatial Resolution18

1 cm

Spatial Resolution18

Boron Sheet

1 cm

Spatial Resolution18

Pixel

Edge Projection

1 cm

Spatial Resolution18

Spatial Resolution σ(95 +/- 4) μm

@ 315 V – 385 V

Pixel

Edge Projection

1 cm

SummaryMarkus Köhli

Physikalisches Institut (LCTPC)

RheinischeFriedrich-Wilhelms-Universität

Bonn

High Resolution Neutron DetectionThe Neutron Time Projection Chamber

BODELAIRE

SummaryMarkus Köhli

Physikalisches Institut (LCTPC)

RheinischeFriedrich-Wilhelms-Universität

Bonn

BODELAIRE Trigger & Track Principle

High Resolution Neutron DetectionThe Neutron Time Projection Chamber

SummaryMarkus Köhli

Physikalisches Institut (LCTPC)

RheinischeFriedrich-Wilhelms-Universität

Bonn

BODELAIRE Trigger & Track Principle

Using both conversion products

High Resolution Neutron DetectionThe Neutron Time Projection Chamber

SummaryMarkus Köhli

Physikalisches Institut (LCTPC)

RheinischeFriedrich-Wilhelms-Universität

Bonn

BODELAIRE Trigger & Track Principle

Combination of gaseous tracking detector [TimePix]and a photo sensitive detector [SiPMs]

Using both conversion products

High Resolution Neutron DetectionThe Neutron Time Projection Chamber

SummaryMarkus Köhli

Physikalisches Institut (LCTPC)

RheinischeFriedrich-Wilhelms-Universität

Bonn

BODELAIRE Trigger & Track Principle

Combination of gaseous tracking detector [TimePix]and a photo sensitive detector [SiPMs]

Using both conversion products

Spatial Resolution σ(95 +/- 4) μm

High Resolution Neutron DetectionThe Neutron Time Projection Chamber

[ ]

[ ]

SummaryMarkus Köhli

Physikalisches Institut (LCTPC)

RheinischeFriedrich-Wilhelms-Universität

Bonn

Spatial Resolution σ(95 +/- 4) μm

BODELAIRE Trigger & Track Principle

Combination of gaseous tracking detector [TimePix]and a photo sensitive detector [SiPMs]

Using both conversion products

High Resolution Neutron DetectionThe Neutron Time Projection Chamber

[ ]

SummaryMarkus Köhli

Physikalisches Institut (LCTPC)

RheinischeFriedrich-Wilhelms-Universität

Bonn

Spatial Resolution σ(95 +/- 4) μm

BODELAIRE Trigger & Track Principle

Combination of gaseous tracking detector [TimePix]and a photo sensitive detector [SiPMs]

Using both conversion products

High Resolution Neutron DetectionThe Neutron Time Projection Chamber