20
FP420Low and high voltage supply
Henning E. Larsen,
INFN
Feb. 2007
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
Now only 2 det. not 3 as shown
Specification for LV for 1 superlayer
PixChips/4 Voltage Current Current limit
Analog 1.6-2.0VNom 2V
5-70mA 100mA
Digital 1.5-2.5VNom 2V
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 PixChips + 1 MCC
+ Read-out?
Voltage Current 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
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
Source: Maurice Garcia-Sciveres
Location for service electronicsUntil today we suppose:• If the LV electronics should stay within some 20m from the detectors, there are only two possible locations (ref Daniela
Macina):
– Below the new cryostat, where the radiation level is estimated at about 700 Gy per year of running at full luminosity;
– Below or near the adjacent magnets, where the radiation is much lower and estimated at about 15 Gy per year, but where there are already other things.
Space for service electronics.•Few meters of cable•Radiation level?•Shielding possibility?
Space for electronics needing close proximity to detectors
FP420 detectors
Space for HV LV under adjacent magnets: Height available=400mm
Solution options for HV and LV
• Commercial– Caen– Wiener– Eplax
• Home-made
CMS/Atlas counting room
Commercial: Caen
SY1527
A1676A
Crate Ctl
A1676A
Crate Ctl
A3486
2x48V
Power
A3486
2x48V
Power
Atlas or CMS
Slow control
EASY 3000
A3009
12ch
LV
A3009
12ch
LV
A3009
12ch
LV
A3009
12ch
LV
A3009
12ch
LV
EASY 3000
A3501
12ch
HV
A3501
12ch
HV
A3501
12ch
HV
A3501
12ch
HV
A3501
12ch
HV
A3501
12ch
HV
A3501
12ch
HV
FP420
FP420
FP420
FP420
FP420
LHC Tunnel
EASY 3000
A3009
12ch
LV
A3009
12ch
LV
A3009
12ch
LV
A3009
12ch
LV
A3009
12ch
LV
EASY 3000
A3501
12ch
HV
A3501
12ch
HV
A3501
12ch
HV
A3501
12ch
HV
A3501
12ch
HV
A3501
12ch
HV
A3501
12ch
HV
FP420
FP420
FP420
FP420
FP420
Cryostat 1 Cryostat 2
Commercial: Caen
A3009 LV
A3501 HV
A3009 LV
A3501 HV
A3486 48V Power
•Modules
•Delivery not possible before summer 2008 due to LHC production bottle neck. Only few samples by mid 2007.
•CAN bus link over 500++m require slow down to 250kbit/s. This is not yet tested but should be ok. Requires modification of firmware:
•High voltage only up to 120V (requires modification from 100V nominal)
Cable:500m
Commercial: Caen, pictures SY1527
EASY 3000
Not to scale
A3009
A3501
A3486
Counting room
Rad exposed
The TSL beam
The TSL (Theodore Svedberg Laboratory) is located at the Uppsala University. It is a cyclotron, providing protons (up to 180 MeV) or Ions (up to 1.24 GeV).
We used a proton beam of 159 MeV energy, with a fluence of 6 x 107 p/(cm2s).
The horizontal profile of the beam is shown on side. Its width is 20 cm at 80% fluence, allowing the irradiation of a whole 6U distributor.
From: Agostino Lanza (INFN-PAVIA) http://www.pv.infn.it/~servel/atlas/hv/hv_sys/index.html
Caen: A3009 LV supply radition test results
A3009 Used by ATLAS RPC and LVL1, plus CMS and others
1. TSL Upsala, May 2006. 159 MeV proton synchrotron 1. By: Cern Electronics Pool (Allongue, Anghinolfi and Fontaine), by
Passuello from Caen and Agostino Lanza (INFN-PAVIA)
2. Tested to 140Gy or 2x1011 p/cm2 with results:• One unplugged events solved with remote hardware reset.
• One fake trip (non shown on the monitored loads), solved with a remote "clear alarm”.
• No reports about gamma test.
• Has been certified for ATLAS .
Caen: A3486, 400 Vac tri-phase – 48 Vdc converter • A3486 is used many places in ATLAS RPC and LVL1, plus CMS. Unit is a common
unit for supplying all the Axxxx type converter boards throughout Cern
• TSL Upsala, May 2006. 159 MeV proton synchrotron
– By: Cern Electronics Pool (Allongue, Anghinolfi and Fontaine), by Passuello from Caen and Agostino Lanza (INFN-PAVIA)
– Tested to 140Gy or 2x1011 p/cm2 with results:
– One undervoltage on the second channel,solved with a recovery reset.• Looking for reports about gamma test.
• Has been certified for ATLAS .
A3501 has not been radition tested. It is said by CAEN to be largely equivalent to A3540 (12x4KV).
Test results for A3540 are as follows:
1. Casaccia, Jan. 2006: CO-60 source, named “Calliope” in the ENEA-Casaccia
• Monitor showed undervoltages after 54 GY, but without any inconvenient to the outputs. During the interval between the two periods, the controller board was replaced with a new one, but again after 73 minutes (60 Gy) from the beginning of the second period it started showing undervoltages.
• After 134 Gy, channels started to fail. The last channel to die was ch 1, which lasted 239 minutes (165 Gy).
• Information from: http://www.pv.infn.it/~servel/atlas/hv/hv_sys/casaccia_report.ppt
2. Casaccia, March 2006: CO-60 source
• Localized the problems from Jan 2006 to the controller boards (EEPROM´S). Replaced by new type (Renesa) => up to 200Gy with only soft-errors which can be recovered by remote operation. Approved for Atlas.
3. TSL, Uppsala Jan. 2006: 159 MeV proton synchrotron, fluence of 6 x 10^7 p/(cm2s).
• All 12 channels of the A3540 died below the 140 Gy limit, as expected from the previous Casaccia test.
• Information from: http://www.pv.infn.it/~servel/atlas/hv/hv_sys/index.html
A3501 HV supply radition test results
Caen solution: count of HV+LV tunnel items
• One pocket is: – 5 Super layers = 10 HV + 10 LV
– One A3501 + one A3009 = 2+4 slot = 6 slots in an EASY3000 crate
• Concluding:– 1 to 3 pockets = one EASY3000 crate+one A3486
AC/DC crate
– 3 to 6 pockets = two EASY3000 cartescrate+one A3486 AC/DC crate
Notes
• Cable length to counting room is like 500m for CMS. Still missing numbers from Atlas.
• Caen communication using CAN bus over this distance is not tested but should work at slow speed, 250kbit/s.
• Pocket counts is important
• No provision for temperature monitor of front end!
Commercial: Wiener solution A
• 2x4 Mpod-like systems (8U,19” each) will be arranged to provide the requested voltages over 500 m distance,
• Located in the counting rooms and will host both HV and LV modules. • 2 cable pipes with 10 cm section (or probably less) are needed. • The Mpod will require custom -120V modules. .
4*2 Mpods with 80ch each.
Location: Counting room
Mpod
x 8
Now only 2 HVNow only 2 HV
Commercial: Wiener solution B
• 2x10 Maraton-like radiation tolerant systems (3U) will provide LV and operate close to the detectors.
• 2x2 Mpod-like devices will supply HV from the counting rooms.
• This solution requires a customization of Maraton in order to optimize it for low currents.
• The Mpod will require custom -120V modules.
LV: One crate per pocket
Mpod
x 2 x 5
LV: One crate per pocketHV: One per cryostat
1 Maraton 1 Maraton
Now only 2 HV
x 5
Commercial: Wiener solution C
• 2x22 Maraton-like system will provide HV and LV and operate close to the detectors.
• Simple cable • These systems will be optimized for the given current range. • Need customization for -120V modules• Proven radition tolerance: 722Gy, 8 1012n/cm2
1 Maraton
2.2 crates per pocket
H=3U=131mm
1 Maraton
2.2 crates per pocket
x 11x 11
Now only 2 HV
Power calculations
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 5 43.375 W
Values are worst case (highest) power
Conclusions• Suggest putting the LV/HV crates under the adjacent magnets. Room has been
reserved (almost).
• Caen solution is an all-in-tunnel solution with short HV-LV cables. No long bulky noise suceptible cables to put.
• Caen commercial solution is ok up to 140Gy for 2 out of 3 modules (Atlas certified) but:
• Caen A3501 (HV) need to be tested for radiation tolerance. There are no specific rad results available. Only results are based on its equivalence to A3540 (Atlas HV)
• Some customization are needed– CAN modules
– A3501 (HV)
• Number of superlayers per station is interesting for the required number of crates
• Caen and Wiener solution has no provision for temperature monitor of front end!
• Wiener solution is spec’d to be radiation tolerant to 700Gy which is greater than we actually need.
