FP 420 Low and high voltage supply Henning

FP 420 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

1) 2) 3)

1) All in tunnel -- CAEN • A 3009, A 3486, A 3540, A 3801 tested up to 140 -150 Gy. A 3501 never tested. • 500 m cable too long for CAN protocol, modification of hw necessary

1) Tunnel/counting room -- Wiener 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

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

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

1) 2) 3)

Recommendation • Recommend the solution with all but linear regulators in the counting room. Thus having 500 m supply cables and linear regulators next to the front-end • Linear rad-hard regulators available from Cern stores for 2 V, 3. 3 V and +5 V supplies • Solution for +-12 V for Gastof/QUARTIC 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 • 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

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?

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

Quartic/Gastof regulators for +-12 V • Radhard LHC 4913/7913 from Cern stores not suitable for +-12 V • Intersil HS-117, +12 V 1. 2 A – Constructed with the Intersil dielectrically isolated Rad Hard Silicon Gate (RSG) process – rad-hard to 3 k. Gy, latch-up immune – Test report: http: //www. intersil. com/military/HS-117 RH_SEE_Test_Report. pdf • Still missing -12 V candidate devices

Test of solution 3) Goal: Setup to validate supply over 500 m. This requires construction of a PCB with a couple of LHC 4913/7913 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 +-12 V 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 -12 V 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 NG 28

Reserve

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

Power Supplies Description of solution LV CAEN Easy 300 0 Ne ar sta tio n HV Nea r stati on Wiener MPOD TBD Wiener Maraton Al co ve Co un tin g ro o m Wiener Maraton TBD CAEN Easy 30 00 TBD Cou ntin g roo m TBD Cable cost Mod ule cost 27 k€ 180 k €+ 10 k€ Maintenance access, radiation and SEU issues TBD Maintenance access, radiation and SEU issues. Need further radiation tolerance qualifications TBD Maintenance access issues No voltage tuning from remote. TBD Maintenance access issues. Need linear regulator. No voltage tuning from remote. Radiation field is unclear. QUARTIC/GASTOF's +12 V issues 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 +12 V issues 60 k€ 95 k€ 100 k€ 144 k€ Notes 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