mosaic 1.1 final design revie · 2010-04-15 · mosaic 1.1 final design review - electronics dhe...

Mosaic 1.1 Final Design Review - Electronics

Mosaic 1.1 Final Design Review

Electronics


Topics

• Design Requirements• System Interconnection and Cabling• DHE Interface

– Signal Assignments– Grounding

• DHE Power Supply• Shutter Control• Temperature Control• Torrent Controller Upgrade• Spares & Technical Support


Design Requirements:Operations Concept Document

• Electronics must be designed to allow access forrepairs while installed on telescope

• Temperature monitoring must be provided (on and offthe telescope)

• Shutter control must be provided (ADC, filters, guideprobes independent of upgrade)

• Focal plane temperature control must be provided• Utilize existing services available at prime focus (AC

power, fiber cables)• Remote reset of MONSOON controller required


PDR Recommendations

• Recommendations from the PDR panelrelevant to electrical design:– Use MONSOON Orange for first year of

operations– Provide single-amp readout capability as CCD

amplifier failure mode recovery– Spares should be included in requirements– Install thermal fuse in focal plane


Interconnection and Cabling

REF: M1U-TE-03-01


DHE Interface: Clocks

• Total Clocks per CCD = 11 clocks– Serial L & R registers must be independent to allow dual vs.

single amp modes (S1_L, S1_R, S2_L, S2_R, S3 = 5 clocks)– Combine summing wells and reset gates (SW_L + SW_R =

SW, RG_L + RG_R = RG, 2 clocks)– Parallel phases (P1, P2, P3 = 3 clocks)– Dump Gate (1 clock)– Scheme does not match Torrent capabilities - see slide 16

• Mosaic = 88 clocks Need 3 clock boards!• Maintain signal integrity between CCD and clock

boards Need to assign 3 CCDs per clock board socombine dump gates of 3 CCDs to total 31 clocks


DHE Interface: Biases

• 2 CCD Acquisition Boards 64 Total Biases– Scheme matches Torrent capabilities

• Total Biases per CCD = 8 Biases– 4 Low Voltage Biases (Output Gates OG1_L,

OG1_R, OG2_L, OG2_R)– 4 High Voltage Biases (combine reset drains and

dump drains to minimize count)• OD_L, OD_R independent• RD_L + RD_R combined• DD_L + DD_R combined


DHE Interface: Videos

• Total Video Outputs per CCD = 2 videos• Mosaic = 16 videos 2 Acquisition boards• Video input wired as pseudo-differential input


DHE Interface: Grounding

REF: MNSN-EL-05-0020


DHE Power Supply

• Larger analog voltage suppliesneeded to power (3) clockboards and (2) CCD acquisitionboards

• Total power in prime focus (PF)cage will be 195 Watts - currentArcon controllers produce ~100W

• Power supply will be designedto remove power supply heat(~135W) by conduction into thePF structure

• Remote reset will beaccomplished using E-netswitchable AC power strip in PF

Power Supply Current (A) Power (W)

3.3V Digital 2.21 7.2935V Digital 0.59 2.95+5V Analog 1.504 7.52-5V Analog 0.852 4.26+15V Analog 1.219 18.285-15V Analog 0.962 14.4330V Analog 0.126 3.906DHE Power 58.644Total Power (30% efficiency) 195.48

Note: This slide applies to MONSOONOrange only. Torrent power suppliesare integrated into the DHE and willdissipate 50 Watts total power.


Shutter Control

• DHE-to-MSE Interface• MONSOON Clock used as shutter

signal• Opto-isolator circuit is copy of current

Arcon interface• Second opto-isolator installed on vector

board for convenient spare.• Connector J11 is same as existing thus

cabling can be re-used• See M1U-TE-03-04


Temperature Control Interface

• Omega Temperature Controller• MSE Interface for temperature monitoring• Thermocouple interface for servicing (fill station)


Focal Plane TemperatureController

• Omega 320 Cryogenic Temperature Controller– Low/High Heater Settings (2.5W/25W)– Autotune PID– RS232 Communications


Focal Plane TemperatureControl Circuit

• Two 25Ω heater loops simulate existing circuit (allows 12.5Ω,25Ω, or 50Ω operation)

• 120°F Thermal cutoffs added (same part used in NEWFIRM)• Control Sensor is Lakeshore silicon diode• See M1U-TE-03-02


Torrent Upgrade Plan

• No changes required to the Dewar (mechanical or electrical)• No software changes required• Plan upgrade for summer shutdown 2011? (2-3 weeks)• Ship instrument to Tucson (MONSOON power supply too)

– Remove the Orange DHE, Omega Temp controller– Install Two Torrent controllers (16 video channels)– Test CCD readout, temperature control, and shutter control

• Ship instrument back to 4-meter telescope– Install instrument on telescope & computers.– Install remote reset cabling (see next slide)– Conduct a minimal T&E/Commissioning effort - only need to verify

Torrent hardware performance on-site (e.g. grounding, gain,readnoise, etc.) - this effort should be similar to standard T&E at thebeginning of each instrument change.


Torrent UpgradeConsiderations

• Single amp vs. dual amp read modes - operational decisionneeded– Single amp mode would require two additional Torrent DHEs for

on-the-fly configuration This option is more costly andcomplicates servicing access

– Single amp mode could be accomplished with two Torrent DHEs ifthe transition module is rewired This option would require a dayor two of instrument downtime

• Remote reset capability of Torrent will require some wiringmodifications to the telescope and minor software updates This modification is not essential, but would provide a more“graceful” DHE reset option.


Spares and TechnicalSupport

• Critical components will have spares– MONSOON Boards (MCB, CCDACQ, CLKBD)– MONSOON Power Supply (duplicate to be built by KPNO

and used at 0.9-meter telescope)– Omega Temperature Controller (Lakeshore used for QUOTA

is available as a spare)– Connectors (already purchased)– CCD (engineering grade good enough for spare)

• Technical Support– Full technical documentation will be provided– First tier support provided by KPNO EM & MPG (they will be

involved with system integration & testing for training)– Second tier support will be provided by MONSOON group


Appendix:Mosaic Upgrade Schematics

• M1U-TE-03-01 Top-Level Interconnection Diagram• M1U-TE-03-02 Internal Dewar Wiring Diagram• M1U-TE-03-03 Dewar-To-DHE Cable Diagram• M1U-TE-03-04 MONSOON DHE Signal Wiring Diagram• M1U-TE-03-05 MONSOON DHE Power Distribution• M1U-TE-03-06 MONSOON 60W Power Supply• M1U-TE-03-07 Temperature Control Cable Diagrams

mosaic 1.1 final design revie · 2010-04-15 · mosaic 1.1 final design review - electronics dhe...

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