Differences between revisions 49 and 59 (spanning 10 versions)
⇤ ← Revision 49 as of 2011-02-10 08:53:11 →
Size: 3553
Editor: KojiArai
Comment:
← Revision 59 as of 2012-01-03 23:02:45 → ⇥
Size: 4283
Editor: localhost
Comment: converted to 1.6 markup
Deletions are marked like this. Additions are marked like this.
Line 1: Line 1:
## page was renamed from Upgrade 09/GreenLock/Electronics
Line 2: Line 3:
 
Line 5: Line 5:
<<ImageLink(electronics_diagram.png,Upgrade 09/GreenLock/Electronics/electronics_diagram,height=400)>>

<<TableOfContents(2)>>


[[BR]]
[[BR]]		 [[Upgrade 09/GreenLock/Electronics/electronics_diagram|{{attachment:electronics_diagram.png||height=400}}]]<<TableOfContents(2)>><<BR>><<BR>>
Line 16: Line 10:
attachment:VCO_range.png
Line 18: Line 11:
{{attachment:VCO_range.png}}
Line 22: Line 16:
attachment:VCO_filter.png {{attachment:VCO_filter.png}}
Line 25: Line 19:
Line 32: Line 25:



[[BR]]		 <<BR>>
Line 37: Line 27:
Line 40: Line 29:
attachment:TF_PDH.png {{attachment:TF_PDH.png}}
Line 43: Line 32:
Line 45: Line 33:

Line 48: Line 34:

[[BR]]		 <<BR>>
Line 52: Line 37:
 . SR620 is employed to read out the frequency of the beat signal.
Line 53: Line 39:
 .SR620 is employed to read out the frequency of the beat signal. {{attachment:SR620.png}}
Line 55: Line 41:
attachment:SR620.png

||<-3> '''''setting parameters''''' ||		 || '''''setting parameters''''' ||
Line 63: Line 47:
[[BR]] <<BR>>
Line 66: Line 50:

<<ImageLink(green_digital.png,Upgrade 09/GreenLock/Electronics/digital_channel ,height=400)>>


[[BR]]		 [[Upgrade 09/GreenLock/Electronics/digital_channel|{{attachment:green_digital.png||height=400}}]]<<BR>>
Line 74: Line 54:
The schematic is available on [https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD svn]
Line 76: Line 55:
 . EG&G SGD-444A Si PIN PD attachment:SGD-444A.pdf The schematic is available on [[https://nodus.ligo.caltech.edu:30889/svn/trunk/alberto/40mUpgrade/RFsystem/RFPDs/GreenLockingBroadBandPD|svn]]

[[attachment:Hartmut_RFPD.jpg|{{attachment:Hartmut_RFPD.jpg||height=400}}]]

 . EG&G SGD-444A Si PIN PD [[attachment:SGD-444A.pdf]]
Line 79: Line 62:
attachment:RFPD_tf.png {{attachment:RFPD_tf.png}}
Line 82: Line 65:
attachment:RFPDnoise.png {{attachment:RFPDnoise.png}}
Line 84: Line 67:
Here is the noise model for the RFPD using liso.
attachment:liso_RFPD.png		 Here is the noise model for the RFPD using liso. {{attachment:liso_RFPD.png}}
Line 87: Line 69:
[[BR]] <<BR>>
Line 91: Line 73:
 attachment:PDA36A.png  . {{attachment:PDA36A.png}}
Line 93: Line 75:
||<-4> ''''' parameters ''''' ||
|| trans impedance gain || || [V/A] ||
|| responsibility || || [A/W]||
|| quantum efficiency || || [%]||		 The PDA36A is an amplified, switchable-gain, silicon detector designed for detection of light signals over 350 – 1100nm wavelength range.

|| ''''' parameters ''''' || || ||
|| Detector || Si PIN || ||
|| trans impedance gain || 1.5k - 475k (switchable)|| [V/A] ||
|| responsibility || 0.3 || [A/W] at 532 nm ||
Line 98: Line 82:
|| Output Voltage || 0-5 || [V] with 50 Ohm termination ||
|| Band Width || 17 || [MHz] ||
|| Dark noise || || nV/sqrtHz ||
Line 99: Line 86:
[[BR]]
<<BR>>
Line 102: Line 90:
 . anti-aliasing filter
Line 103: Line 92:
 . anti-aliasing filter
 
Line 109: Line 96:
[[BR]] <<BR>>
Line 113: Line 100:
attachment:thermalLPF.png {{attachment:thermalLPF.png}}
Line 116: Line 103:
attachment:thermal_actuator.png
 
[[BR]]		 {{attachment:thermal_actuator.png}}

<<BR>>
Line 121: Line 108:
 To get a phase modulation imposed on the end IR lasers, a function generator is needed.  . To get a phase modulation imposed on the end IR lasers, a function generator is needed.
Line 123: Line 111:


[[BR]]		 <<BR>>
Line 127: Line 113:
In order to send a feedback signal and modulation signal to the laser PZT at the same time,
it is desired to have a summing amplifier.
The amplifier should handle the signal from DC to 200kHz.
Currently this is taken place by SR560.		 In order to send a feedback signal and modulation signal to the laser PZT at the same time, it is desired to have a summing amplifier. The amplifier should handle the signal from DC to 200kHz. Currently this is taken place by SR560.
Line 133: Line 116:
Line 135: Line 117:

[[BR]]		 <<BR>>
Line 140: Line 121:
 . attachment:tc200.jpg  . {{attachment:tc200.jpg}}
Line 142: Line 123:
[[BR]] <<BR>>
Line 147: Line 128:
 . attachment:zfl1000.png  . {{attachment:zfl1000.png}}
Line 152: Line 133:
 . attachment:k18.jpg  . {{attachment:k18.jpg}}
Line 156: Line 137:
 . attachment:ff888.jpg  . {{attachment:ff888.jpg}}
Line 160: Line 141:
 . attachment:m22.jpg  . {{attachment:m22.jpg}}
Line 162: Line 143:
[[BR]]
-----
= Power Supply and Cables =
== HV cables (-150V) for photodiode bias ==
== 15V and 24V lines ==

[[BR]]		 <<BR>>
Line 174: Line 149:
-----

= Vertex BeatBox =

 . [[attachment:vertex_green_beatbox.pdf]]
 . [[attachment:vertex_green_beatnox.graffle]]
 . [[attachment:freq_divider.pdf]]
 . [[attachment:freq_divider.graffle]]

Overview of green electronics

  • Preliminary design for the electronics used in 40m green locking.

Upgrade 09/GreenLock/Electronics/electronics_diagram

Contents

  1. Overview of green electronics
  2. VCO for frequency tracking
    1. VCO range
    2. Filter respons
    3. Noise performance
    4. Capture range and Lock range
    5. lock detection and boost
  3. PDH box
    1. Filter Shape
    2. Noise performance
    3. LPF for RF cutoff
    4. Remotely controlled Boost switch
  4. frequency counter
  5. digital channel assign
  6. wideband RFPD for green PLL
    1. frequency response
    2. noise performance
  7. DC PDs
    1. PDA36A
  8. digital front end filters
  9. Thermal feedback LPF
    1. circuit diagram
    2. expected transfer function of compound frequency actuator
  10. Function Generator
  11. Summing Amplifier
    1. Diagram
    2. noise performance
  12. Temperature Controller for doubling oves
  13. RF stuff
    1. low noise amplifier
    2. mid power amplifier
    3. power splitter
    4. DC block
    5. Low frequency mixer
  14. RS232 serial device server
  15. Vertex BeatBox



VCO for frequency tracking

VCO range

  • Synergy VCO part number XXX has 1.2MHz/V VCO range.

VCO_range.png

Filter respons

  • 80MHz LIGO VCO box is used to readout the frequency of the beat signal precisely.

VCO_filter.png

Noise performance

Capture range and Lock range

  • According to a simple calculations...

lock detection and boost

  • rms detection


PDH box

Filter Shape

TF_PDH.png

Noise performance

LPF for RF cutoff

Remotely controlled Boost switch


frequency counter

  • SR620 is employed to read out the frequency of the beat signal.

SR620.png

setting parameters

readout range

MHz

DAC bit resolution

noise


digital channel assign

Upgrade 09/GreenLock/Electronics/digital_channel

wideband RFPD for green PLL

  • A Silicon photodiode with the diameter of 10mm is used. To have a fast response up to about 1MHz -150V is applied onto the photo diode.

The schematic is available on svn

attachment:Hartmut_RFPD.jpg

frequency response

RFPD_tf.png

noise performance

RFPDnoise.png

Here is the noise model for the RFPD using liso.


DC PDs

PDA36A

  • PDA36A.png

The PDA36A is an amplified, switchable-gain, silicon detector designed for detection of light signals over 350 – 1100nm wavelength range.

parameters

Detector

Si PIN

trans impedance gain

1.5k - 475k (switchable)

[V/A]

responsibility

0.3

[A/W] at 532 nm

output impedance

50

[Ohm]

Output Voltage

0-5

[V] with 50 Ohm termination

Band Width

17

[MHz]

Dark noise

nV/sqrtHz


digital front end filters

  • anti-aliasing filter
  • anti-imaging filter
  • whitening filter


Thermal feedback LPF

circuit diagram

thermalLPF.png

expected transfer function of compound frequency actuator

thermal_actuator.png


Function Generator

  • To get a phase modulation imposed on the end IR lasers, a function generator is needed.

SR___


Summing Amplifier

In order to send a feedback signal and modulation signal to the laser PZT at the same time, it is desired to have a summing amplifier. The amplifier should handle the signal from DC to 200kHz. Currently this is taken place by SR560.

Diagram

noise performance


Temperature Controller for doubling oves

  • TC200 from Thorlabs

  • tc200.jpg


RF stuff

low noise amplifier

  • ZFL-1000 from mini circuit or similar families

  • zfl1000.png

mid power amplifier

power splitter

  • ZFRSC-42 from mini circuit. DC-4.2GHz

  • k18.jpg

DC block

  • BLK-89 from mini circuit. 50 Ohm, 100kHz-8GHz

  • ff888.jpg

Low frequency mixer

  • ZAD-8 from mini circuit. 500Hz-10MHz.

  • m22.jpg


RS232 serial device server

Vertex BeatBox

Advanced_Techniques/Green_Locking/Electronics (last edited 2017-04-20 01:58:36 by RanaadhikariATligoDOTorg)