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Cryo and AFE IIt Update

Cryo and AFE IIt Update. MICE Video Meeting April 12, 2006 A. Bross. Cryo Update I. The cryo-system for the VLPCs has been operated extremely reliably and stably from May 05, through the end of the KEK TB and now for about 2 months again at Fermilab

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Cryo and AFE IIt Update

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  1. Cryo and AFE IIt Update MICE Video Meeting April 12, 2006 A. Bross

  2. Cryo Update I • The cryo-system for the VLPCs has been operated extremely reliably and stably from May 05, through the end of the KEK TB and now for about 2 months again at Fermilab • However, it was felt that the thermal-link design could be made more robust • A bolted concept has now been detailed and will be used in all subsequent systems • Assembly details still need to be worked out • Vacuum tests on the bolt to envelope weld were successful • The drawing package is complete and we have awarded the bid to Ability Engineering for $140k for 4 systems • Does not include • Cryo-coolers • Temperature controlers and sensors • Lid Heater circuitry • Cassette He gas system • New Thermal link design is incorporated even though is has not yet been tested. • We will retrofit the prototype system and test design. • Will occur in June

  3. Cryo Update II

  4. Cryo Update III • However II • Need to solve an assembly problem at upper thermal link

  5. AFE IIt Update • The AFE IIt pre-production boards (15) have now all arrived at Fermilab and 5 or 6 are under test • The first boards came up very quickly • In about 1 hour • No green wires! • TriPt testing is done • Yield is about 80% • More than enough chips for D0 + MICE + Spares for both experiments • Plus second pass could yield more • Expect Production Order has been released • About 14 week lead for delivery of all boards • But many will arrive earlier • The critical issue for MICE is MICE-specific firmware development for AFE IIt • NOT a Trivial amount of work

  6. AFE IIt

  7. JW@FTG, 2006Mar21 LED Spectra:AFE1 AFEII

  8. Issues that still Need some Thought • AFE IIt board temperature and bias calibration • Does MICE need a test stand (like D0 has) to do this operation? • LED pulser data • Plan to dismount wavguides and mount a LED pulser or excite the fibers with blue LEDs? • New LVSB Board • Not likely. Existing board looks OK. 6 new boards are being assembled now. • Firmware development still might be needed • May be able to get support for this from Fermilab CD • Rate • If we keep analog and timing information we are limited to: • »250 muons per msec of spill • It is possible that clever (extreme) programming of the AFE IIt can push this up a bit. • If we drop analog and timing and only use discriminators, we can run at 7 MHz.

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