VSC Seminar - Indico...Pirani/Penning gauge PKR251 Piezo gauge Huba 680.99413 Nikolaos...

Vacuum, Surfaces & Coatings Group

Technology Department

VSC Seminar

Radiation-Tolerant design of gauge electronics in the LHC ARCs

Nikolaos Chatzigeorgiou

TE-VSC-ICM

Nikolaos Chatzigeorgiou, CERN – TE/VSC VSC Seminar 28.11.2017 2

1. Some numbers of gauges in the DS/ARCs

2. Motivation for RadTol design and goals

3. New system architecture and RadTol electronics

RadTol Penning LOG stage

RadTol 4-20mA transmitter stage

4. Summary

5. 2018 work


• Insulation vacuum for Magnets ~ 10E-7 mbar

• Insulation vacuum for QRL ~ 10E-7 mbar

• Beam vacuum ~ 10E-9 mbar

Pressure monitoring

Leak detection or pumping group problem

Protection of the cryostat (Alarms to CRYO – Pirani/Piezo)

Active gauges Penning E-9 #Head: IKR251, gauge: PKR251

Pirani #Head: custom, Gauge: PKR251

Piezo #Huba 680.99413

DS 16 16 48

ARC 312 312 120

Total 328 328 168

Penning headIKR251

VRJGE Pirani headCustom CERN

Pirani/Penning gaugePKR251

Piezo gaugeHuba 680.99413


Max 1km

• Gauges are distributed along the 3km DS/ARC

• Group of 3 gauges for the sectors (Piezo, Pirani, Penning) covers whole pressure range

• Group of 2 gauges for the pumping groups and beam vacuum (Pirani, Penning)

• Front-end electronics inside VRJGE convert the signal from gauges to analog 0-10V

• The analog signal reach a PLC, which is located in a safe service area (Alcove)

• The maximum distance between PLC and VRJGE is 1km

• PLC converts the analog 0-10V to pressure and provides alarms to CRYO (Piezo, Pirani)

Q D

Gauge electronics

ND100 cable

D D Q D D D

PLC

RE

local cables of gauges

Piezo, Pirani, Penning gauges

VRJGE

Example mid-arc left side of IP

Q D D D Q D D D


LHC environment is changing (beam energy, 25ns operation, luminosity, etc.)

5

Run 1+22009-2018

Run 1+2+32009-2022

Run 1+2+3+HL-LHC2009-2035

30 to 90 Gy ARC

200Gy in DS

Mitigation through RadTol development 500 Gy is our Goal (safety factor>2 for DS) RadTol version not supported by industry Piezo, Pirani, Penning front-end electronics re-design

Data from Radiation calculation group


Compatibility Performance

Maintenance Architecture

R2E

Design goals are driven mainly by R2E but we can have other added values


System

RadTol

Transmission

Modular

Maintenance

Safety

Redundancy

Penning

Compatibility

•IKR070 (E-11)

•PKR251 (E-9)

Pirani

Performance

Calibration

Compatibility

•TPR018 gauge

•PKR251 gauge

Piezo

Robust supplies

Power Supply

Redundancy

Linear PS

Robust

Local for all electronics


• Mini-rack bellow the 1st or 2nd dipole after quadrupole

• Mini-rack will house a 3U euro-crate

• Each gauge will have a dedicated RadTol card

• Modular cards – hot replaceable

Q D

Multi-conductor cable

D D Q D D D

PLC

Alcove

Local gauge cables

Piezo, Pirani, Penning gauges

Example mid-arc left side of IP

Patch Panel

Mini rackFront-end electronics

ND100

4-20mA

ctrls

VRJGE

Q D D D


PenningE-9 mbar

6TE

SHV

0-10V

6TE

PenningE-11 mbar

0-10V

LEMO triax

6TE

Pirani

0-10V

Burndy 4 female

HVAC

ATM

6TE

Piezo

0-10V

Burndy 4 male

±13.5V

By-PassValve

6TE

+24V

84 TE

ProfibusTermination

6TE

Redundant Power Supply±24V

18TE

Supply 1±24V

Supply 2±24V

Dedicated front panel for each card – type of gauge

Presently we have up to 7 gauge electronics

Can fit up to 11 front-end cards + the power supply


Simple - Linear Power supply provides regulated ±24V to the backplane

Enough power to supply the whole euro-crate – up to 11 measuring cards

Board will be ready early 2018

Dry, Temperature, CO60, CHARM tests

Redundant Power Supply±24V

18TE

Supply 1±24V

Supply 2±24V

Mains UPS230VAC


6TE

Piezo

0-10V

Burndy 4 male

±13.5V

Supplies the active piezo with ±13.5V

Converts the gauge output to 4-20mA

Full board early 2018

Dry, Temperature, Vacuum, CO60 and CHARM tests


6TE

Pirani

0-10V

Burndy 4 female

HVAC

ATM

Compatible with passive and active Pirani gauge

Full card early 2018

Dry, Temperature, Vacuum, CO60 and CHARM tests


PenningE-9 mbar

6TE

SHV

0-10V

6TE

PenningE-11 mbar

0-10V

LEMO triax

Compatible with E-11 and E-9 mbar gauges

Full board by end of 2017

Dry, temperature, Vacuum, CO60 and CHARM tests

LOG and Transmitter stage tested separately:

LOG stage accumulated 500 Gy

Transmitter (4-20mA) accumulated 500 Gy


Design Stages Active components PSI test status

Power Supply • Transformer• Filtering• Regulation

• μA7824• MC7924CTG

Piezo • Regulation• Transmission

• μA7815• LM7915CT• LM317• TPS7A3001

Pirani • Wheatstone bridge• Conditioning• Regulation• Transmission

• OP2177ARZ • 2N3019• BC850C

• μA7815• LM7915CT• SM6T39CA

Penning • Regulation• Royer oscillator• Conditioning• LOG amp• Transmission

• μA7815• LM7915CT• LM317• 2N3019• OP2177ARZ

• BC850C• OPA128LM• 2N3811• LT1029CZ• PAD1

• Standardization of stages and components across different design – reduction of PSI campaigns

• 2 active components left for PSI tests in 2018

• Some auxiliary and/or backup will be tested in 2018


• Characterization through current sources• Current measurement from 3pA to 100uA – 8 decades • Error is 1% for 6 decades - 2% for 10pA – 8% for 1pA

1.E-11

1.E-10

1.E-9

1.E-8

1.E-7

1.E-6

1.E-5

1.E-4

1E-12 1E-11 1E-10 1E-9 1E-8 1E-7 1E-6 1E-5 1E-4

Pre

ssu

re [

mb

ar]

Input Current [A]

IKR070: Measured Pressure vs Input Current

Pressure vs Input Current

𝑃 = 𝑎𝐼𝑖𝑛0.8

𝑎 = 0.017 ൗ𝑚𝑏𝑎𝑟𝐴

0%

2%

4%

6%

8%

10%

12%

1E-13 1E-12 1E-11 1E-10 1E-09 1E-08 1E-07 1E-06 1E-05 1E-04 1E-03

Erro

r %

I [A]

abs (Δ I/I), f(I), room temperature

Error from Ib1 - OPA128LM Error from Ib2 - OP2177

Error from Is1 - Is2 Theoretical Total Error

Measured Total Error (4 samples)


Error below 2% for all range – 4% for 1E-11 mbar

Acceptable temperature response between 15 – 30 Degrees C

4 LOG stages in 3 runs (total 3 weeks) at CHARM

10pA (2.79E-11 mbar) sourced to each LOG

All 4 LOG stages accumulated 500Gy with small degradation

0%

1%

2%

3%

4%

5%

6%

7%

1E-11 1E-10 1E-09 1E-08 1E-07 1E-06 1E-05

ΔP

/ P

%

Pressure [mbar]

abs(ΔP/P), f(P), room temperature

Measured Total Error (4 samples) Theoretical Error

0%

10%

20%

30%

40%

50%

60%

70%

80%

15 C 20 C 25 C 30 C 35 C

ΔP

/P %

Temperature [°C]

abs (ΔP/P), f(T)

1.0E-11 2.7E-11 1.7E-10 1.1E-09 6.8E-09

4.3E-08 2.7E-07 1.7E-06 1.1E-05

0 100 200 300 400 500

1E-11

2E-11

3E-11

4E-11

5E-11

6E-11

7E-11

8E-11

9E-111E-10

Fixed pressure readout change with absorbed dose

0Gy2.79E-11mbarPre

ssure

(m

bar)

Dose (Gy)

500Gy 3.4E-11mbar

Pressure curves


-0.05

0

0.05

0.1

0.15

0.2

0.25

0 1 2 3 4 5 6 7 8 9 10

Erro

r %

Input Voltage [V]

(Δ I/I ), f(V), room temperature

Channel 1, 2 - 0.1% Channel 3, 4 - 0.01%

Characterization with precision voltage sources

Error below 0.05% for 0.01% and 0.2% for 0.1% channels

5 transmitter stages in 3 runs (total 3 weeks) at CHARM

Input voltage ramp of each transmitter (0 – 10V) for 4-20mA output

All 5 samples accumulated 500 Gy – Analysis on-going!

On-going analysis

0 100 200 300 400 500

0.00

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

I/

I (%

)

Dose

0V - R0.1%

1V - R0.1%

5V - R0.1%

10V - R0.1%

0 100 200 300 400 500

0.00

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

I/

I (%

)

Dose

0V - R0.01%

1V - R0.01%

5V - R0.01%

10V - R0.01%


Schedule Activity 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

• Task 1:Active gauges in the arcs

Study, simulations, components survey

DS+ARC Design & Proto

DS+ARC Dry & temperature tests

DS+ARC PSI COTS rad tests

DS+ARC CC60 modules rad tests

DS+ARC CHARM modules rad tests

DS+ARC CHARM system rad tests

DS series (16 Pirani/Penning; 48 Piezo)

DS rad test

DS installation

DS commissioning

ARC series

ARC rad test

ARC installation

ARC commissioning


• New system architecture designed for fast and safe interventions

• Improved transmission guarantees signal integrity over long distances

• New electronics are compatible with different gauges (passive, active)

• Tolerance to radiation up to 500Gy with small degradation has been fully tested for:

Penning LOG stage (EDMS 1871072)

Transmitter 4-20mA stage (on-going analysis)


• Finish designs for Pirani, Piezo, Power supply early 2018

• Mechanical integration – backplane PCB

• ECR request for mini-racks

• Dry and temperature tests following real vacuum tests in XHV lab (30/1-034)

• CHARM system tests for 500 Gy TID classification

• Manufacture electronics for DS series

• LS2 installation and commissioning planning


Group VSCPaulo Gomes; Gregory Pigny, Pawel Krakowski, Andre Rocha, Rodrigo Ferreira, Jorge Fraga, Berthold Jenninger and Sophie Meunier.

R2EMarkus Brugger (EN-EA); Ruben Garcia Alia (EN-STI-FDA).

EN-STI-ECESalvatore Danzeca; Gilles Foucard; Paul Peronnard; Georgios Tsiligianis

TE-CRG-CIJuan Casas-Cubillos; Nikolaos Trikoupis.

VSC Seminar - Indico...Pirani/Penning gauge PKR251 Piezo gauge Huba 680.99413 Nikolaos...

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