1. FP420 Low and high voltage supply Henning.E.Larsen@gmail.com INFN/Univ. of Torino July. 2008 A presentation intended to stimulate the discussion on which solution is best

2. 1) 3) 2)

3. 1) All in tunnel -- CAEN A3009, A3486, A3540, A3801 tested up to 140-150 Gy. A3501 never tested. 500 m cable too long for CAN protocol, modification of hw necessary

4. MPOD LV next to cryostat MPOD HV in counting room MPODs never radiation tested – Wiener optimistic and willing to test Maraton LV next to cryostat MPOD HV in counting room Customisation of Maraton necessary (low currents) Maraton tested up to 700 Gy, but limited Remore control 1) Tunnel/counting room -- Wiener

5. 2) Alcoves/counting room -- Wiener Customisation of Maraton necessary (low currents)

6. 3) Counting room Wide choice of supplies, lower cost, easier maintenance. High cable cost, need local rad-hard regulators

7. 1) 3) 2)

8. Recommendation Recommend the solution with all but linear regulators in the counting room. Thus having 500m supply cables and linear regulators next to the front-end Linear rad-hard regulators available from Cern stores for 2V, 3.3V and +5V supplies Solution for +-12V for Gastof/QUARTIC is being investigated

9. 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 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

10. 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?

11. Cable bundle, one station = two pockets+Quartic/Gastof

12. Quartic/Gastof regulators for +-12V Radhard LHC4913/7913 from Cern stores not suitable for +-12V 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 http://www.intersil.com/military/HS-117RH_SEE_Test_Report.pdf Still missing -12V candidate devices

13. Test of solution 3) Goal: Setup to validate supply over 500m. This requires construction of a PCB with a couple of LHC4913/7913 regulators. I assume we can borrow the necessary power supplies from either wiener or caen. use the same cable to evaluate the temperature monitor system, but again we need to borrow the module from CAEN/Wiener use the same cable to test HV supply for Si tracker but not for Quartic/Gastof. Ideally we should also test the rad-hard version of +-12V regulators for quartic/gastof but I guess it may be hard to get samples, otherwise we can use the non-rad hard equivalents. Still lacking a design for -12V Q/G supply. I don’t foresee test of Q/G HV setup. For that we would need to buy HV cable (HTC-50-2, 1300€) as we cant use the NG28

14. Reserve

15. Power Supplies: requirements LV HV No. of channels Power budget

16. Power Supplies Description of solution Cable cost Mod ule cost Notes LVHV Ne ar sta tio n CAEN Easy300 0 Nea r stati on CAEN Easy30 00 27k€ 180k €+ 10k€  Maintenance access, radiation and SEU issues Wiener MPOD Cou ntin g roo m TBD60k€TBD  Maintenance access, radiation and SEU issues.  Need further radiation tolerance qualifications Wiener Maraton TBD95k€TBD  Maintenance access issues  No voltage tuning from remote. Al co ve Wiener Maraton TBD100k€TBD  Maintenance access issues.  Need linear regulator.  No voltage tuning from remote.  Radiation field is unclear.  QUARTIC/GASTOF's +- 12V issues Co un tin g ro o m TBD 144k€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 +- 12V issues In tunnel, under magnets: O(10) Gy/year 0.1 SEU/day/module In alcoves at 200 m from IP: 0.05-0.36 Gy/year