FP420 Tracker and Timing detector Low and high voltage supply [email protected] INFN/Univ....
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Transcript of FP420 Tracker and Timing detector Low and high voltage supply [email protected] INFN/Univ....
FP420Tracker and Timing detectorLow and high voltage supply
INFN/Univ. of Torino
Cern meeting, Jan. 2009
Distances involved
HV-LV supply segmentation
Damage depends on distance from the beam. Required bias voltage and current increase with radiation dose.
Drawing: From Ray Thompson
PT1000 Temperature sensor?
Pixels:50x400um and 400x50um
MCC: Module Controller Chip
1 Superlayer =2 Hybrids/Blades4 2D detectors1 MCC1 Read-out interface
Specification for LV for 1 superlayer
1 Pixel FE-I3 Voltage range Voltage nom. Current range Current limit
Analog 1.6-2.0V 1.6V 5-70mA 100mA
Digital 1.5-2.5V 2.0V 1% occupancy: 40-50mA 10% occupancy: 60-70mA
100mA
MCC/1 Voltage Current Current limit
Digital 1.8-2.5V 120mA-150mA 170mA
Ripple at 1MHz is critical. Remote on/off. Monitor current.Digital supply for Pixelchip and MCC is common as seen from supply.
4 FE-I3 Chips +
1 MCC
+ Read-out?
Voltage range
Current range Current limit
Analog 1.6-2.0V 20-280mA 310mA
Digital 1.8-2.5V 1% occ 280mA-350mA
10% occ 360mA-430mA
480mA
Monitor resolution <20mV <10mA
?What about the readout optoboard.
Does this not need power?Up till now this was not considered!
Specification for HV supply for one superlayer
4 detectors
2 voltages
Voltage Current Current limit
-10-120V <1mA 1mA
Monitor
Resolution
<1V 1μA Voltage is negative, but floating.Referenced to AVDD on PIXELCHIP, not GND
HV connection diagram used in Atlas Pixelchip FE-I3
Source: Maurice Garcia-Sciveres
Channel count
Channel count Voltage Current /chOne
SuperlayerOne
PocketOne
CryostatAtlas or CMS One LHC
AVDD 1.6V 20-280mA 1 5 10 20 40DVDD 2.0V 280-430mA 1 5 10 20 40VBias1 0. -120V 1mA 1 5 10 20 40VBias2 0.-120V 1mA 1 5 10 20 40
Temperature na. na. 1 5 10 20 40
This needs update!
What about the optoboard. Does this not need power?
L4913 rad hard regulator nr. count
Detector Name Voltage Current One cryostat
LHC Note
Tracker AVDD 1.6V <280mA 10 40
Tracker DVDD 2.0V <430mA 10 40
Timing DV3.3 3.3V 1A 2 8 Approximate
Timing AV5.0 5.0 1A 2 8 Approx.
TOTAL 96
Power requirement summary
One superlayer Voltage[V] Current[A] Power[W]AVDD 2 0.28 0.56 WDVDD 2.5 0.43 1.075 WHV 100 0.001 0.1 WTotal load per SL 1.735 W
One pocket #Superlayers 5 8.675 W
One station (Cryostat) #Pockets 2 17.35 W
Values are worst case (highest) power
RR13 Tunnel Sector
FP420 rack in part of one 1.6m high rack
From: D. SWOBODA
Location for service electronics in tunnelSpace for service electronics.• 5 to 10m of cable•Radiation level, 700Gy/y, 20MeV 1x1012/cm2/y•Shielding possibility but not really efficient
Space for electronics needing close proximity to detectors
FP420 detectors
•Space for HV LV under adjacent magnets•Height available=400mm•Cable length to FE is about 20m•Radiation level, 10 to 100Gy/y, 20MeV 1x1010/cm2/y
Solutions considered
b) Adj. MagnetsMB11a,b
c) RR alcoves (LV)HV in CR
d) Counting room
Local linear regulator to stabilize load voltage
•Monitor of load current by the power supply
•Monitor of the load voltage by sense wires and separate adc
•No remote adjustment of load voltage!
•Is that a serious problem?
•GND current in L4913 is rather high and varies. This means sense wire should not be too thin (Note from Z. Hajduk)
Solutions studied• Location of LV supplies
a) Next to pocket (700Gy/y, h > 20 MeV = 1x1012 cm-2 /y)
b) MB11a,b, under adj. Magnets (10G/y, h > 20 MeV = 4x1010 cm-2 /y)
c) RR alcoves (0.5Gy/y, h > 20 MeV = 1x108 cm-2 /y)
d) Counting Room (0 Gy/y)
• CAEN EASY3000: b), c)
• Wiener – Marathon: b), c)
– MPOD: c)
• Brand X in counting room: a)+d)
a) Require either only passive (Patch-panel) or fully graded rad-hard electronics
b) Require radiation tolerance and good SEU resistance.c) Require radiation tolerance and some SEU resistance and linear rad hard
regulators at FEd) Standard high quality floating powersupplies and linear regulators at FE
Recommendation
• Recommends the solution with all complex electronics in the counting room and (LV) linear regulators next to frontend. Thus having 500m supply cables for both HV and LV.
• Power supplies are floating output.
• Shield and reference gnd at detector end only. In the counting room, Transorbers (zeners) connected from screen to chassis/earth for safety.
• Linear rad-hard regulators available from Cern stores for 2V, 3.3V and +5V supplies
• Solution for +-12V for Timing detector is being investigated
All supplies in counting room:Advantages/disadvantages
• Best access• Most reliable• No radiation to sensitive electronics• Uses standard non rad-tol. power modules
– cheaper, spares readily available
• Large cable cost• More difficult to test as the EMC environment is
hard to predict• Custom design and test of linear regulator board• No remote adjustment of low-voltages
Cable bundle, one station = two pockets+Quartic/Gastof
(1): Number of individual channels per FP420 arm(2): Cable count is a multple of this number. Used to ensure each pot has its own cables(3): Diameter of one cable(4): Q/G detectors need +-12V. The LHC4913 only goes to +9V and LHC7913 to -7V, which means that it is not useful for long wire
LHC4913: Vin=3 to 12V, Vout = 1.25 to 9V, Vdropout<0.7V LHC7913: Vin=-3 to -9V, Vout -1.21 to -7V, VdropOut<0.8V(5): Change this collumn's value to explore different configurations of cable count and cable drop(6): AVDD and VDD wires share the same cable LV AVDD(Si): Low voltage Silicon detector analogue supply LV(Q/G): Low voltage Quartic/GastofLV VDD(Si): Low voltage Silicon detector digital supply HV(Q/G): High voltage Quartic/GastofHV(Si): High voltage Silicon detector
Legend and notes:
Cable usage
Channels (1)
SC
EM
Type
Area each w
ire ?
Wires per cable
Nr. of cables
Cable segm
ents (2)
Cable unit cost
Cable cost
Diam
of one cab. (3)
Current per channel
Pow
er pairs per channel
Monitor pairs per
channel
Wire resitance
Total voltage drop
Cable length
Total w
ires
Spare nr. of w
ires
Notes
mm2 CHF/m CHF mm A (5) ?/km V m
LV-AVDD(Si) 10 04.21.52.228.7 NG28 1.00 28 6.30 0.31 2 1 9.3 2.868 500 60LV-VDD(Si) 10 04.21.52.228.7 NG28 1.00 28 6.30 0.48 4 1 4.6 2.220 500 100
LV(Q/G) 6 04.21.52.228.7 NG28 1.00 28 4 1 6.30 12,600 20 2 8 1 2.3 4.625 500 108 4 (4)HV(Si) 20 04.21.52.140.4 NE26 0.50 26 2 2 5.20 5,200 16.5 0.001 1 0 37.0 0.037 500 40 12
HV(Q/G) 4 04.31.51.555.2 HTC-50-3-2 0.50 2 4 1 1.00 2,000 6 0.001 1 0 37.0 0.037 500 8 0Temperture 10 04.21.52.020.1 ND26 0.25 26 2 1 4.20 4,200 14 0.001 1 1 74.0 0.074 500 40 12
42,900 CHF 26,598 €
Cables for one arm of FP420
6 18,9002 20 8 (6)
Total cable cost per station (arm):
Issues with Timing detector regulators for +-12V
• Radhard LHC4913/7913 from CERN stores not suitable for +-12V so we need alternative:
• Intersil HS-117, +12V 1.2A– Constructed with the Intersil dielectrically isolated Rad
Hard Silicon Gate (RSG) process
– rad-hard to 3kGy, latch-up immune – Test report: http://www.intersil.com/military/HS-117RH_SEE_Test_Report.pdf
• Still missing -12V candidate devices
Further actions
• Setup a test to validate the supply over 500m of cable.
• Find a suitable solution for timing detector’s +-12V supplies. But seems that this may not be needed after all!
• Find a suitable power supply for use in the counting room. Many options available.
Description of solution Cable cost
Module cost
Notes LV HV
Nea
r st
atio
n
CAEN Easy3000 N
ear
stat
ion
CAEN Easy3000
4*6k€ 180k€+
10k€ Maintenance access,
radiation and SEU issues
Wiener MPOD
Cou
ntin
g ro
om
TBD 4*6k€
(approx.) TBD
Maintenance access, radiation and SEU issues.
Need further radiation tolerance qualifications
Wiener Maraton
TBD 4*20k€=
80k€ TBD
Maintenance access issues No voltage tuning from
remote.
Alc
ove
Wiener Maraton
TBD 4*20k€=
80k€ TBD
Maintenance access issues. Need linear regulator. No voltage tuning from
remote. Moderate radiation QUARTIC/GASTOF's
regulator +-12V issues
Cou
ntin
g ro
om
TBD TBD 4*27k€=
108k€ TBD
Lowest module cost. High cable cost. Need linear regulator. No voltage tuning from
remote. Little or no radiation or
access issue. QUARTIC/GASTOF's
regulator +-12V issues
Commercial: CAEN module pictures
SY1527
EASY 3000
Not to scale
A3009
1 Maraton
A3501
Commercial Wiener module pictures
MPODMaraton
Radiation levels - summary
6/12/2008 Forward Physics at the LHC 23
Location Distance from IP [m]
Dose[Gy]
h > 20 MeV[cm-2]
1Mev Eq.[cm-2]
Q6 220 1 3x108 2x109
RR13,17,53,57 250 0.5 1x108 1x109
Q11 430 500 9x1011 2x1012
FP420 space 416-430 700 1x1012 1x1013
MB11A 400 about(HL) 12*10 (HL) 4x1010 2x1011
MB11B 400 about(HL) 10 3x1010 1x1011
Annual levels for nominal LHC
Source: T. Wijnands, TS Department
RELEVANT REMARKS FROM THIJS WIJNANDS
If CAEN power supplies are put next to the stations below magnets:
Nr. SEU/module/day ~ 0.1
Single-event upsets (SEU) start from day-one.
Control system that allows automatic reset of a module
without changing the output voltage is needed
(like LHC power converters).
Failure due to accumulated dose expected @ 40-50 Gy
(typical of transistors)
Maraton system overview
SPACE IN RR ALCOVES
According to Detlef SWOBODA it may be feasible finding space for our crates in alcoves at 250 m from the interaction point also used by Totem for power supplies.(RR17/13 for Atlas and RR57/53 for CMS). - dose/year: (Totem data) <1Gy, 1e9 n/cm2, 1e8 h/cm2
- neutron flux ~ 108 n/cm2/y (factor 100 less than at the detector station)
If this is true probably other irradiation tests not needed