Slide 1

Status of the Active and Passive
Radiation Monitoring Systems
Federico Ravotti (PH/TOT)
TOTEM Collaboration Meeting
18 March 2009


Slide 2

Contents
• Active RadMon System
Dedicated electronics and cabling integrated into the DCS

–
–
–
–

Review and Implantation in the experiment;
Status of the system components;
Results of the Pilot System (Sep.-Nov. 2008);
Control Software and Integration in IP5;

• Passive RadMon System
Set of samples which do not need readout electronics

– Review of passive dosimeters used in TOTEM;
– Passive RadMon units;
– Implantation and Bill of Materials;

• Conclusions
TOTEM CM – 18 March 2009

F. Ravotti-Status of Active/Passive RadMon

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Slide 3

Active RadMon
dose/fluence/temp.

VRAD
read. current

VRL

ELMB

4
12

IFET

IRAD

ELMB-DAC
TOTEM CM – 18 March 2009

p-JFET
RRL

ELMB
RadMon Box

RadMon
Sensor

RRAD

PatchPanel
F. Ravotti-Status of Active/Passive RadMon

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Slide 4

Active RadMon Implantation
UPS pow er

CMS pow er

ELMB readout

RadMon

PS 12V
PS 12V
PS 12V



PVSS II

PS 12V
PS 12V
PS 12V

PS 12V
PS 12V
PS 12V

RP

OPC client
ELMB OPCserver
sysWORXX

PS 5V
PS 5V
PS 5V

T1

PS 12V
PS 12V
PS 12V

Pressure

T2

PS 30V
PS 30V
PS 30V

1 ELMB + 2 DAC + 2 PP = 6 ISC
1
Counting room (USC55)

RadMon
DAC
bus12
bus04

bus08
ELMB
RadMon

ELMB
vacuum

ELMB
T SiD

ELMB
T cooling

ELMB
RadMon

R-DAC

4

ELMB
T CSC

ELMB
others

ELMB
RadMon

R-DAC

R-PP

HV-PP

ELMB
T GEM

ELMB
others

R-DAC

R-PP

P-PP H-PP

R-PP

P-PP H-PP

2
56

28

8
Cavern

4

8

pressure hum idity

8

4

ISC

PT-100

PT-100

Tunnel

2

24

vacuum

PT-100

Roman Pots

TOTEM CM – 18 March 2009

ISC

2

168

ISC

pressure hum idity

4

PT-1000

T1

F. Ravotti-Status of Active/Passive RadMon

T2

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Slide 5

RadMon ISCs & ELMBs

• 2 RadFETs (TID); 2 p-i-n diodes (Feq); NTC:
 RadFETs: ~ 100mA x 1000 ms

• 7 ELMBs for RadMon within the

 p-i-n diodes: 1mA x 700 ms

batch of the DCS (Fernando);

• All 36 ISCs produced & characterized at
the end of 2008 by PH/DT;

• 2 in RPs @ 220 mt, 1 in T2 ¼ so far;
• PH/DT manages the stock of spares for

• ELMBs configured for “nonstandard” CAN-bus data transfer
mechanism: on-demand SDO
(usually: synchronized PDO).

LHC experiments.
TOTEM CM – 18 March 2009

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Slide 6

ELMB-DACs
11V diode
replaced
with
5V diode

• NIKHEF Project (2002), ATLAS (2006)
• New production TOTEM/LHCb (2008)

• 2 Prototypes with wrong Zener diode
• 40 DACs produced and tested
• 34 OK (3 damaged & repaired) – 6 BAD

VE = 30V

• 14 + 6 spares for TOTEM + left PCBs ...
• Each of 16 ch./DAC individually calibrated
with test bench in lab. 555 running PVSS

and data analysis program (William)
TOTEM CM – 18 March 2009

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Slide 7

ELMB-DACs Testing
Load 1.3 kW to stay within the V range < 30 V

I-V curves in the range 0-20 mA for the 12 sensor Ch.  each of the 4 switch Ch.

ISC 1

ISC 2

ISC 3

TOTEM CM – 18 March 2009

NTC currents are not perturbated
during DAC operation
F. Ravotti-Status of Active/Passive RadMon

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Slide 8

PatchPanel (PP) boards
• ATLAS PP for 6 ISCs hosting 2 rad. sensors +
NTC (2005)

• Design of TOTEM/LHCb PP for 3 ISC hosting
4 radiation sensors + NTC (2008)
ISC 1

ISC 2

ISC3

Spares

• 2 Prototypes + 36 Produced (Johan)
• Production inspected and tested (Josef)
• 35 OK (few scratches on signal lines t.b.r.)

• 1 Discarded (big blisters on PCB surface)
• 14 + 4 spares ready for TOTEM
TOTEM CM – 18 March 2009

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Slide 9

RadMon Pilot Setup Sep. 2008
• Practice made on ATLAS-Ljubljana prototype in Lab. 555 (Nov. 2007-Sep. 2008)
• Pilot setup of our readout installed in USC55 from Sep. 8th to Nov. 2008

CAN Bus

Rack S2B19
Laptop with PVSS & CAN-USB
TOTEM CM – 18 March 2009

Rack S2B02
ELMB+DAC+PP
Final PSs chosen for RadMon and all DCS

F. Ravotti-Status of Active/Passive RadMon

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Slide 10

Monitors layout in the Tunnel
PMIL 5312 (RAMSES)

RadMon 51 (POT2)

B1

PMIL 5314 (RAMSES)
TOTEM RadMon 50

~ 5 mt.
PMIL 5712 (RAMSES)
Ramses

B2

PMIL 5714 (RAMSES)
TOTEM RadMon 51
RAMSES monitors also integrated into DCS
TOTEM CM – 18 March 2009

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Slide 11

Radiation @ TOTEM “week 1”

TOTEM CM – 18 March 2009

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Slide 12

Result RadMon Pilot Setup

We could reproduce the Tc of all sensors @ 300 mt. (here Tc = ~ 25 mV/C)
TOTEM CM – 18 March 2009

F. Ravotti-Status of Active/Passive RadMon

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Slide 13

What else did we learn ?
• Grounding of the Power Supplies;
• Temp. behaviour on the RPMB in
function of cooling conditions
(det. OFF: T~13C while T(Si) =-35C)

• CMS mField does not induce noticable
changes (after proper grounding);

• Test and debug the PVSS control
function with > 35‘000 readout cycles.
TOTEM CM – 18 March 2009

F. Ravotti-Status of Active/Passive RadMon

I Max = 18kA

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Slide 14

RadMon Control Software
• RadMon ELMBs use different data handling;

• Prototype of PVSS ctr. function developed & tested:
now used in the RPMB Test Panel of Lab. 555 (Ivan)

• Sizable work for the DCS team (D2-to-D5);

• Sequential readout of 3 ISCs (1 PP board) in ~ 30s.
ISC1
SW OFF  NTC  SW ON  READ sens. & curr.  SW OFF
ISC2
SW OFF  NTC  ...

• Needs to be integrated in the global DCS structure;
• Proper logic to be fully defined and implemented.
TOTEM CM – 18 March 2009

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Slide 15

HW Integration in IP5
• Cabling:
– USC55:
• RPs: all OK, 1 connector/ISC (Antoine);
• T1/T2: all OK with SUB-D’s  Adaptation needed

– Missing: Connectors and “short cables” @ RP 147 mt.

• DCS Rack:
– RPs: “ELMB Box” is being assembled and cabled (Johan);

– T1/T2: mechanics ready, “ELMB Box” to be assembled.

TOTEM CM – 18 March 2009

F. Ravotti-Status of Active/Passive RadMon

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Slide 16

Passive RadMon
Complementary/Redundant Radiation Measurements;
Passive sensors needs to be removed for readout;
WG started as common project for LHC Experiments (2004);
Since then …
–
–
–
–

ATLAS: samples from different institutes;
ALICE: ?
CMS/ATLAS-ALFA: samples from DESY;
LHCb: exploited the WG outcome.
TOTEM
TLD

PAD
(Alanine)

RPL

BPW

Dose
Range

10 mGy to
100 Gy

10Gy to
1MGy

100mGy to
100 kGy

2x1012cm-2 to
4x1014cm-2

Readout
technique

Heating; Light
emission

ESR

UV; Light
emission

Voltage
measurement

TOTEM CM – 18 March 2009

F. Ravotti-Status of Active/Passive RadMon

1.E+08
1.E+06
1.E+04

Dose (Gy)

•
•
•
•

1.E+02
1.E+00
1.E-02
1.E-04
RadFET

TLD
Alanine
Dosimeter type

RPL

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Slide 17

Passive RadMon Unit
p-i-n diode BPW
MTS-N

MTS-7
MCP-7

MCP-7

natLiF:Mg,Ti

7LiF:Mg,Ti

7LiF:Mg,Cu,P

7LiF:Mg,Cu,P

TLDs
Sensitive to different spectrum components

INB: xxxx00010132000xxxx

Courtesy: Ch. Ilgner (LHCb)
TOTEM CM – 18 March 2009

F. Ravotti-Status of Active/Passive RadMon

PE box
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Slide 18

Location and Bill of Materials

• 50 PE housing produced by the Dortmund TU obtained via LHCb;
• 40 TLDs out from the agreement LHCb-IJF, Krakow, Poland (includes readout).
– 40 units destined to TOTEM: “fresh” samples for 2009 run on the way for replacement;

• 36 p-i-n diodes from PH/DT;
• > 100 Alanine & > 70 RPL from CERN DG/SCR
2 mounted on RPs. All the rest under assembly (Antoine);
 readout/replacement instructions, INB numbering, ... TOTEM-RAD-002.
TOTEM CM – 18 March 2009

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Slide 19

Documentation

TOTEM CM – 18 March 2009

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Slide 20

Conclusions
• Active RadMon System
– All components were procured/produced;
– Pilot Setup validate the design/allowed extensive tests;
– Control Software needs to be integrated in the DCS;
– Final HW needs to be integrated in IP5;

• Passive RadMon System
– All sensors were procured for experiment startup;
– All passive units are available for installation.
TOTEM CM – 18 March 2009

F. Ravotti-Status of Active/Passive RadMon

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