Aiveen Finn JAI-FEST at Oxford December 2015 Aiveen Finn Contents - - PowerPoint PPT Presentation

▶
aiveen finn
SMART_READER_LITE
LIVE PREVIEW

Aiveen Finn JAI-FEST at Oxford December 2015 Aiveen Finn Contents - - PowerPoint PPT Presentation

Jan 01, 2023 520 likes •959 views

Aiveen Finn JAI-FEST at Oxford December 2015 Aiveen Finn Contents 1. Objectives 2. Micro-bunch Instabilities 3. Detectors 4. Characterisation 5. Bursting Behaviour 6. Conclusions Aiveen Finn Ultimate Goal: Measure the spectral

slide-1
SLIDE 1

Aiveen Finn

JAI-FEST at Oxford December 2015

Aiveen Finn

slide-2
SLIDE 2

Contents

  • 1. Objectives
  • 2. Micro-bunch Instabilities
  • 3. Detectors
  • 4. Characterisation
  • 5. Bursting Behaviour
  • 6. Conclusions

Aiveen Finn

slide-3
SLIDE 3

Ultimate Goal: Measure the spectral characteristics of the radiation generated via the micro-bunched beam in a turn by turn regime. Required Step: Develop a single shot spectrometer. Required Step: Characterise detectors for the spectrometer.

Aiveen Finn

slide-4
SLIDE 4

Micro-bunch instabilities (MBI)

  • 1. Threshold current exceeded
  • 2. Bunch filaments quasi-periodically
  • 3. Emit CSR (mm range in our case)

4. λCSR < σz

Aiveen Finn

slide-5
SLIDE 5

Detector Check List

Schottky Barrier Diodes  mm-wavelength  Room temperature  Low Noise  Excellent Sensitivity  Ultra-fast

http://ecetutorials.com

http://www.laserfocusworld.com/articles/2011/02/

Aiveen Finn

slide-6
SLIDE 6

Schottky Barrier Diodes

  • Very versatile

Low impedance faster speed, lower sensitivity High impedance slower speed, higher sensitivity

Aiveen Finn

slide-7
SLIDE 7

Schottky Barrier Diodes

  • Very versatile

Low impedance faster speed, lower sensitivity High impedance slower speed, higher sensitivity

Aiveen Finn

slide-8
SLIDE 8

Schottky Barrier Diodes

  • Very versatile

Low impedance faster speed, lower sensitivity High impedance slower speed, higher sensitivity

  • 1/f pink noise ∴ keep away from DC

 Use a soft lockin amplifier

Aiveen Finn

slide-9
SLIDE 9

Frequency Range of Detectors

  • 1. 33-50 GHz
  • 2. 60-90 GHz
  • 3. 90-140 GHz
  • 4. 140-220 GHz
  • 5. 220-330 GHz
  • 6. 330-500 GHz
  • 7. 500-750 GHz
  • 8. Quasi-optical detector
  • 100-1000 GHz

30 GHz ~ 1 cm

Aiveen Finn

slide-10
SLIDE 10

Thomas Keating Power Meter

  • Broadband
  • All detectors to be compared against it
  • ‘gold standard’

Aiveen Finn

slide-11
SLIDE 11

TK Power Meter

  • 1. Air cell between panes contains thin metal film
  • 2. Absorption of incident beam causes temperature

changes  changes in pressure of air cell

  • 3. Changes in pressure detected and recorded
  • Requires modulated signal
  • Benefit of TK: can be heated electrically

by directly inputting a known modulated signal

Aiveen Finn

slide-12
SLIDE 12

Aiveen Finn

RF Source

  • Ka band emitter
  • Gunn diode
slide-13
SLIDE 13

~

x2

~ ~

x3 x2

~

x3 26.5-40 GHz 52-80 GHz 79.5-120 GHz 159-240 GHz

Aiveen Finn

RF Source

  • Ka band emitter
  • Gunn diode
slide-14
SLIDE 14

Aiveen Finn RF Source Horn Antenna (& multiplier) Detector

slide-15
SLIDE 15

Aiveen Finn

Power of Signal Received by TK (26-240 GHz)

slide-16
SLIDE 16

Aiveen Finn

Sensitivity per unit area for DXP22 (33-50 GHz) Sensitivity per unit area for DXP12 (60-90 GHz)

slide-17
SLIDE 17

Aiveen Finn

Sensitivity per unit area for DET08 (90-140 GHz) Sensitivity per unit area for WR5.1 (140-220 GHz)

slide-18
SLIDE 18

Aiveen Finn

Sensitivity per unit area for WR3.4 (220-330 GHz) Sensitivity per unit area for QOD (100-1000 GHz)

slide-19
SLIDE 19

Aiveen Finn

Detector Array

slide-20
SLIDE 20

Aiveen Finn

e- beam

Viewport SBD Array

slide-21
SLIDE 21

Aiveen Finn

slide-22
SLIDE 22

Aiveen Finn

slide-23
SLIDE 23

Data Acquisition

  • Constantly stream data from all 8 channels
  • Carry out very large FFTs
  • Only keep ROI

– Around revolution frequency of the ring

Aiveen Finn

slide-24
SLIDE 24

Aiveen Finn 24

Low Alpha B22 10mA at -330z (Nov 2015)

slide-25
SLIDE 25

Aiveen Finn

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 10

  • 2

10

  • 1

10 10

1

10

2

10

3

signal incl sensitivities per area

Bunch Current, mA Signal from SBDs, W/m

2 [solid]

Signal from SBDs, arb. units [dash] 33-50GHz 60-90GHz 90-140GHz 140-220GHz 220-330GHz 330-500GHz 500-750GHz 100-1000GHz

15/11/2015

Signal (Normal Mode SB 2.5 MV)

slide-26
SLIDE 26

Aiveen Finn

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 10 10

1

10

2

10

3

noise incl sensitivities per area

Bunch Current, mA Signal from SBDs, W/m

2 [solid]

Signal from SBDs, arb. units [dash] 33-50GHz 60-90GHz 90-140GHz 140-220GHz 220-330GHz 330-500GHz 500-750GHz 100-1000GHz

15/11/2015

Noise, Variation (Normal Mode SB 2.5 MV)

slide-27
SLIDE 27

Aiveen Finn

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 10

  • 2

10

  • 1

10

SNR incl sensitivities per area

Bunch Current, mA Signal from SBDs, W/m

2 [solid]

Signal from SBDs, arb. units [dash] 33-50GHz 60-90GHz 90-140GHz 140-220GHz 220-330GHz 330-500GHz 500-750GHz 100-1000GHz

15/11/2015

SNR (Normal Mode SB 2.5 MV)

slide-28
SLIDE 28

3.4 MV, alpha = -9.9×10-6, fs = 675 Hz, Ibunch = 63.9 μA Slide Courtesy

  • f

Ian Martin

14/4/2015

time (ms) time (ps) 1 2 3 4 5 6

  • 50

50 100 200 300 400 500 600 700 10

  • 4

10

  • 2

frequency (GHz) amplitude (W) mean max/min 1 2 3 4 5 6 0.5 1 burst frequency (kHz) streak camera 1 2 3 4 5 6 0.5 1 burst frequency (kHz) BPM 1 2 3 4 5 6 0.5 1 burst frequency (kHz) SBD 1 2 3 4 5 6 7

  • 6
  • 3

3 6 time (ms) bunch centre (ps) 1 2 3 4 5 6 7

  • 2

2 mean BPM#4 (mm) 1 2 3 4 5 6 7 2 4 6 8 time (ms) bunch length (ps) 1 2 3 4 5 6 7 0.1 0.2 time (ms) SBD (W) 33-50 60-90 90-140 140-220 220-330 330-500 500-750

slide-29
SLIDE 29

3.4 MV, alpha = -9.9×10-6, fs = 675 Hz, Ibunch = 85.1 μA

time (ms) time (ps) 1 2 3 4 5 6

  • 50

50 100 200 300 400 500 600 700 10

  • 4

10

  • 2

frequency (GHz) amplitude (W) mean max/min 1 2 3 4 5 6 0.5 1 burst frequency (kHz) streak camera 1 2 3 4 5 6 0.5 1 burst frequency (kHz) BPM 1 2 3 4 5 6 0.5 1 burst frequency (kHz) SBD 1 2 3 4 5 6 7

  • 6
  • 3

3 6 time (ms) bunch centre (ps) 1 2 3 4 5 6 7

  • 2

2 mean BPM#4 (mm) 1 2 3 4 5 6 7 2 4 6 8 time (ms) bunch length (ps) 1 2 3 4 5 6 7 0.2 0.4 time (ms) SBD (W) 33-50 60-90 90-140 140-220 220-330 330-500 500-750

14/4/2015

Slide Courtesy

  • f

Ian Martin

slide-30
SLIDE 30

3.4 MV, alpha = -9.9×10-6, fs = 675 Hz, Ibunch = 95.9 μA

time (ms) time (ps) 1 2 3 4 5 6

  • 50

50 100 200 300 400 500 600 700 10

  • 4

10

  • 2

frequency (GHz) amplitude (W) mean max/min 1 2 3 4 5 6 0.5 1 burst frequency (kHz) streak camera 1 2 3 4 5 6 0.5 1 burst frequency (kHz) BPM 1 2 3 4 5 6 0.5 1 burst frequency (kHz) SBD 1 2 3 4 5 6 7

  • 6
  • 3

3 6 time (ms) bunch centre (ps) 1 2 3 4 5 6 7

  • 2

2 mean BPM#4 (mm) 1 2 3 4 5 6 7 2 4 6 8 time (ms) bunch length (ps) 1 2 3 4 5 6 7 0.2 0.4 time (ms) SBD (W) 33-50 60-90 90-140 140-220 220-330 330-500 500-750

14/4/2015

Slide Courtesy

  • f

Ian Martin

slide-31
SLIDE 31

Conclusions

 Calibration of TK and source has been achieved  Characterisation of detectors has been completed

  • Further characterisation with

– Noise source at RAL Space – THz Laser at RHUL

  • As always, lots more data analysis!

Aiveen Finn

slide-32
SLIDE 32

With thanks to G. Rehm, P. Karataev, I. Martin, L. Bobb & the Diagnostics Group at Diamond.

Aiveen Finn

slide-33
SLIDE 33
slide-34
SLIDE 34

www.femto.de

Aiveen Finn

slide-35
SLIDE 35

Aiveen Finn

slide-36
SLIDE 36

Aiveen Finn

slide-37
SLIDE 37

Quantification of RF Source

Aiveen Finn

slide-38
SLIDE 38

Aiveen Finn

Low Alpha B22 10mA at -330z (Nov 2015)

slide-39
SLIDE 39

Horizontal Position, mm Vertical Position, mm std 50 100 150 200 50 100 150 200 0.05 0.1 0.15 0.2 0.25 0.3 0.35

Aiveen Finn 39

Horizontal Position, mm Vertical Position, mm mean 50 100 150 200 50 100 150 200 0.1 0.2 0.3 0.4 0.5 0.6

Mean over all 8 Channels

Low Alpha B22 10mA at -330z (Nov 2015)

Standard Deviation over all 8 Channels

slide-40
SLIDE 40

Horizontal Position, mm Vertical Position, mm std 50 100 150 200 50 100 150 200 0.05 0.1 0.15 0.2 0.25 0.3 0.35

Aiveen Finn 40

Horizontal Position, mm Vertical Position, mm mean 50 100 150 200 50 100 150 200 0.1 0.2 0.3 0.4 0.5 0.6

Mean over all 8 Channels

Low Alpha B22 10mA at -330z (Nov 2015)

Standard Deviation over all 8 Channels

Horizontal Position, mm Vertical Position, mm mean/std 50 100 150 200 50 100 150 200 1 1.5 2 2.5 3 3.5 4 4.5

Mean/Std for all 8 Channels

slide-41
SLIDE 41

Aiveen Finn

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 10

  • 2

10

  • 1

10 10

1

10

2

10

3

signal incl sensitivities per area

Bunch Current, mA Signal from SBDs, W/m

2 [solid]

Signal from SBDs, arb. units [dash] 33-50GHz 60-90GHz 90-140GHz 140-220GHz 220-330GHz 330-500GHz 500-750GHz 100-1000GHz

15/11/2015

Signal (Normal Mode SB 2.5 MV)

QOD 220-330 GHz 90-140 GHz 140-220 GHz 60-90 GHz 33-50 GHz

slide-42
SLIDE 42

Frequency  Wavelength

  • υ = 3 GHz  λ = 100 mm = 10 cm
  • υ = 30 GHz  λ = 10 mm = 1 cm
  • υ = 300 GHz  λ = 1 mm
  • υ = 3000 GHz  λ = 0.1 mm
  • υ = 26.5 GHz  λ = 11.3 mm
  • υ = 40 GHz  λ = 7.5 mm
  • υ = 52 GHz  λ = 5.8 mm
  • υ = 75 GHz  λ = 4 mm
  • υ = 120 GHz  λ = 2.5 mm
  • υ = 240 GHz  λ = 1.3 mm

Aiveen Finn