outline: current status active splitter plan chris neu, daniel whiteson, rick van berg l2 upgrade...
TRANSCRIPT
Outline:
•Current status•Active splitter•Plan
Chris Neu, Daniel Whiteson, Rick Van Berg
L2 Upgrade Meeting11 June 2004
XCES Input Path: Status
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 2
XCES Input Path: Status
Recall from last time:
•48 XCES input channels for L2•Tx downstairs use Taxi
Optical Tx strength varies component-to-componentWeak optical Tx strength rampant – half too weak to split; others marginal or sufficient
•16 split channels16 NetOptics splittersHoused near bottom of rack 2RR31C (near entrypoint for XCES fibers from CH)2U chassis, Siemon patch panels on front and rear (thanks to Dervin’s guys for fabrication)Inputs fed in through backHalf of outputs sent out the back, half out the front (particularly convenient)Inputs to splitters coupled directly to XCES fibers at original patch panels
(to avoid moving input fibers)Have each output marked with ID # and loss value to facilitate channel swapping
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 3
XCES Input Path: Status
•Staged 16 new 20’ long fibers feed pulsar boardLeft 4 fibers from stage 0 in as spares
•Installed 16 splitters on 4/15•Chose 16 strongest Tx channels for splitting:
•Tested with L2 tortureTev studies time – my favorite timeScript from Masa: allows user to adjust by hand the XCES thresholds to tune occupancyDuring studies one can mimic real dataAll looked well with Run 2A system
•Beam tests
Pulsar channel XCES channelTaxi Tx loss (-
dBm)
0 0W 15.2
1 0E 15.91
2 12E 15.56
3 15W 16
4 14E 15.73
5 3W 14.67
6 15E 15.47
7 16W 15.12
8 5W 13.22
9 19W 15.69
10 7W 15.33
11 19E 15.68
12 20E 15.5
13 9W 15.08
14 21W 14.82
15 21E 14.97
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 4
Results of Beam Tests: Run 2A system
ADC counts and turn-on curve for high and low XCES thresholds.
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 5
Results of Beam Tests: Run 2A System
bitstotal
unexmiss
bitstotal
wrongE
#
##
#
#0
bitswrong
bitsmissEmiss #
#
wrongtotal
bitsunexEunex #
#
= split channel
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 6
Results of Beam Tests: Run 2A system
Same run, restricting attention to events away from threshold to remove turn-on effects
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 7
Results of Beam Tests: Run 2B system
Two references for Pulsar path, each with their own quirks
Compare Pulsar data to simulation of trigger threshold
Compare Pulsar data tothreshold trigger bits in alpha
Raredifferences
CESD simulation as reference TL2D as reference
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 8
Results of Beam Tests: Run 2B system
Using absolute reference:L2Torture test with patterns in the SMXR thresholds so that the bits were predictable.
In 1 million bits:Run 2B:TP2D: Zero errors!
Run 2A:TL2D: Rare errors
Plots like these to be available in PulsarMon!
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 9
Commissioning Plan: Timeline Made Before Tx Power Problems ID’d
3/15: Stage0 splitter box complete DONE3/16: Install Stage0 splitter box DONE3/15-3/22: Perform optical measurements on all 48 XCES signals coming from downstairs DONE3/22: CDF power back 3/22-4/1: L2 Torture testing: debug/use/refine monitoring code DONE3/23-4/10: Beam tests after understanding L2 Torture DONE4/10: Stage0 complete DONE4/10-5/1: Develop DAQ code for XCES readout DONE5/1: Stage1 splitter boxes completeDONE
5/7: FW for driving out over SLink complete DONE5/1-5/7: Install Stage1 splitter boxes in systemDONE5/7-6/1: L2 Torture and beam tests of split system; DONE L2T of Slink output … Progress Made – BR, SP, Frans et al.5/7-6/1: Install and test XCES Merger link Progress Made6/1: Stage1 complete6/2004: Build and install Stage2 splitter boxes …. complicated by active splitterEnd of 6/2004: Have N Taxi Rx boards in hand ready for system (N = 2 + #spares) READY – thanks to others
7/2004: Install 2 more Taxi Rx boards in system; test with L2 Torture, beam8/2004: Burn-in time in beam; readout by default; monitor for errors8/24/2004: Stage2 complete8/25/2004: 10-week shutdown begins
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 10
The Virtues of Splitting All 48 Channels
•Commissioning of system possible with only 16 split channels
But painful
•Turn-on of XCES path cannot be parasitic-gradual would need to be threshold moment this is not optimal
•Future: would like to have a “hot spare” Pulsar system ready
being fed parasitically with upgrade in place
•Will make things “clean”each channel treated equivalently
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 11
Design of Active Splitter
RVB and I came up with this design at Penn a couple weeks back:
-5V
-5V
-5V
Variable Resistor To set Comparison
Voltage
Taxi Rx HFBR 2416
Taxi Tx HFBR 1414
Taxi Tx HFBR 1414
AD96687
MC10H115
Prototype has been built at Penn; will be here at FNAL for testing next week.
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 12
Two Possible Paths and Timelines
•Delay getting prototype here from PennAtlas test beam work required significant attentionThings calmer now
•Once the hand-made prototype is here we can test it using Taxi Tx-Rx setup in teststand crate•Those tests will determine if basic circuit logic is working and whether we can proceed•Would like to solicit help getting testing off the ground and ultimately testing all boards once they arrive
•Need 48 channels split + spares: so let’s say we need 60 split channels•Choices to consider: 2 channels-per-board x30, or 1 channel-per-board x60
•Two possible paths:Use PCBMake all splitters by hand
•Timeline estimates are different…
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 13
Two Possible Paths and Timelines
PCB:
6/14-6/18: test prototype here at FNAL
work on layout (4 layer, at Penn)6/19-6/25: finalize layout and
determine mechanical issues 6/28: submit design for fabrication 7/12: delivery of boards7/12-7/18: stuffing of parts at Penn
boards start to arrive at FNAL on daily basis
en-masse testing begins7/14-8/1: testing in situ 8/1: all 48 channels split
Assemble by hand:6/14-6/18: test prototype here at FNAL
finalize circuit determine mechanical
issues6/19-7/1: assemble at Penn using vector boards (2 students x several per day)
boards start to arrive at FNAL
on daily basistesting as they arrive
7/1-7/18: assemble boxes, installtest in situ
7/18: all 48 channels splitSchedule complicated by honeymoon in Spain and Italy – leaving in 7 days.But I will have time to test the prototype and look into mechanical issues before leaving.
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 14
Logistical Issues Splitting 48 Channels
•Input fibers from CH come into the rear of the rack•Prefer to leave them in place – do not want to disturb these•So input to splitters should be at rear of rack•Output fibers (for convenience) should come out the back as well•Have ~18 inches vertical space for splitter chassis
•Thinking about 2 rear-facing chassis on shelves looking like this:
•Power comes from a 5V supply plugged into power strip; boards get power across a simple backplane or jumpered together…need to talk to Bob DeMaat.
~17in
~7in
June 11, 2004 L2 Upgrade Meeting Christopher Neu Penn/CDF Page 15
Summary
•Stage 0 and Stage 1 splitting completed ahead of schedule•Stage 2 splitting complicated by need for active splitters
•Have an active splitter design and prototype built•Needs testing - will be done next week
•Decision on path needs to be discussed•Cost issues?
•Will need help testing boards•Lots of things need to be done.