1. Ideas and design concepts, and challenges
DQLPU-B II
Ideas and design concepts, and challenges

2. Content DQLPUB intro Quench detectors Radiation tolerance
System Controller
New Features
Mechanics
Integration

3. DQLPU-B Intro
DQLPU-B houses the base-layer quench detection system for LHC’s main quadrupoles
Currently houses 2 power supplies, 4x DQQDL and 1x DQAMC
Located in the LHC tunnel below the C-Dipole magnets together with 2 DQHDS quench heater power supplies
Existing unit is extremely reliable, hard to beat in that aspect...

4. DQLPU, bits and pieces Quench detector DQQDL Power supplies Controller
Quench detectors
Controller
Crate
Crate controller DQAMC

5. DQULPU-B, Why upgrade ?
Existing units age, replacement in LS3 latest  Replace in LS2 to unload LS3
New features required:
Redundant powering
Quench heater supervision
Implement the features of DQLPU-A
Add some new features to facilitate operation and commissioning

6. Quench detectors Based on proven ProAsic3E FPGA
Hybrid-bridge 3-channel design
16-bit channels with +/-10V input range
Detectors for RQD & RQF share the same board and FPGA U1 UB U2

8. System Controller Hosts several functions: Based on ProAsic3
DQHSU (quench heater supervision)
Quench heater supervision
DQCSU (crate supervision unit)
Monitors supply voltage
Monitors the interlock loop state
Executes power cycle on crate level
Trigger & Timing controller
External trigger monitor (nQPS trigger)
Provides hi-res counter (unloads field bus coupler)
Records trigger-times of detectors to sync PM signals
Based on ProAsic3

9. New Features (compared to DQLPU-A)
PM timing integrity due to Timing & Trigger controller
Monitoring of nQPS trigger line (finally resolves “who triggered first”)
Digital quench detectors with adjustable threshold and better resolution for U1 and U2
JTAG access to all FPGAs
facilitates in the field firmware updates
enables remote firmware updates if future crate controller allows it...

10. Radiation Tolerance Rad tolerance up to 10Gy/a, 10a  100Gy
Component selection limited
Key components already tested:
Component
Rad test up to
Comment
A3PE1500 (FPGA)
400Gy (A3P400)
Well known, 1636 pieces in LHC since 2010 for SymQ
MAX11100 (ADC)
420Gy (good up to 200Gy)
Very similar model since 2010 in LHC
ADR435 (reference)
500Gy (good up to 200Gy)
Leaves specs >200Gy; does not Latch
AQV251A (PhotoMOS)
250Gy
(good to 150Gy)
Breaks in open circuits >175Gy
ADuM3402 (digital isolator)
500Gy
Already in use on nDQQDI/nDQQDG

11. Radiation tolerance Key components to test: Component Type Comment
TPS7A3001
LDO Neg. Voltage
Already used on nDQQDG and parasitically tested
TPS7A4901
LDO Pos. Voltage
OPA2192 or equivalent
General purpose op amp
To be defined and seen
MEJD0515SC
DC-DC 5kV, 2W
2-W type not qualified yet (Medical type, stable baseline)
Flash memory
SPI-Flash
Successor model of AT25F512 or compatible
...

12. Mechanics & Integration
Quench detectors are 6U instead of the traditional 3U
All boards to be packaged in cassettes or board-level enclosures
Chassis and backplane fully passive
Should not be necessary to replace in tunnel
Old Field bus coupler will be still used
Could be updated at a later stage
Final form-factors and enclosures still under evaluation

13. Mechanical demonstrator
Quench detectors System controller
Field bus coupler
Not final yet, subject to testing, might change completely !

14. Integration
V. Viziello

15. Integration
11 cable connection between DQLPU and other components of DYPQ
5-cables to be connected during final assembly
4-cables to be connected in tunnel
All active parts removable  no reason to change crate itself (except broken connectors...)
Integration studies to facilitate maintenance in tunnel ongoing

16. Summary
Basic design of Quench detectors defined,  prototype under construction
First firmware in verification phase
System controller requirements defined,  to be designed
Mechanical studies ongoing
Radiation testing of untested components to be done
 Upgrade has to match reliability of existing unit !