- Table of contents
- Cryostat
- Light Collection System
- TPC - readout tests
- Cosmic Tower
- Muon Range stack
- TOF system:
- Beamline
Assembly calendar: http://lariat.fnal.gov/internal/atwork.html
Cryostat¶
- Phase separator (started: Nov. 14. concluded:?? )
Remove original insulationCut out old phase separatorWeld in new, larger phase separatorLeak/pressure check(Completed week of December 7)- Re-insulate piping near phase separator (Week of December 14... eventually week of Feb. 11)
Light Collection System¶
- Define and implement grounding scheme for PMTs (with help from experts: Linda + Carl/Dean, in progress: started week of December 7)
Add non-conductive patchpanels for HV lines(Completed December 9)Order new 6 or 8 pin FT (for HV)Andrzej at Manchester (Ordered, estimated arrival @ FNAL the week of February 8th)
Define if need screen (grid to ground) in front of the PMTs (Week of January 4)- Test and characterization (prior to installation):
- Hamamatsu 3" PMT: new PMT (but same type as the one in Run1), new base & socket (change polarity from NEG to POS), new cables (signal and HV), new FT.
Test of electrical continuity and functioning (check for undershot).(Completed Dec. 10)Test in LN2 with LED
- ETL 2" PMT: same PMT as in Run1, same base but with modification for change polarity (from NEG to PS), new cables (signal and HV), new FT.
Test of electrical continuity and functioning (check for undershot)(Completed December 15)Test in LN2 with LED (Week of January 18)
- Hamamatsu SiPM (#1 and 2): same as in Run 1
- SensL 3xSiPM new board
Tests and characterization performed during Summer by Dante T (WH, 14th floor)(Completed October 2015)- Ultimately unable to include in system for Run II.
- (Tentative) Add new SiPM with inductive R/O from TPC wires (to be defined)
Add new VUV SiPM (Estimated start: Week of January 11, 2016)Finished Feb 3
- Hamamatsu 3" PMT: new PMT (but same type as the one in Run1), new base & socket (change polarity from NEG to POS), new cables (signal and HV), new FT.
TPB coating: one PMT (ETL) and one SiPM (HMMTS #1) should be coated with TPB+polystyrene film (toluene mixture) (Estimated: week of January 11, 2016)Finished Feb 4Cabling (in situ): 2 PMTs, 3 SiPM boards - Inner Flange - Walter J. (Estimated start: week of January 18)Finished Feb 4- Cabling (in situ): 2 PMTs, 3 SiPM boards - Outer Flange - Walter J. (Estimated start: week of February 8)
- DAQ & trigger modifications
- save multiple flashes during drift time (Bill B., can start any time)
- Implement trigger on PMT-only signal, above variable threshold (Bill B., can start any time)
TPC - readout tests¶
Modify D2S cards to alleviate analog noise, add termination on differential input lines(Completed week of Dec. 30)Reinstall and test D2S cards(Completed week of Jan. 4)Construct sheet metal temporary closure plate and get safety approval for operations with low HV.(Completed week of Nov. 30)Channel mapping testing (checking cold cable connections)(Completed week of Jan. 4)- Test of the bias voltage card: Signal gen. on the wire planes, look for induced voltage on readout of appropriate plane. (Estimated: week of Jan. 4)
Modify bias voltage card for shield plane(Completed week of Nov. 30)-Modify WRD cards to fix 200 MHz noise problem (Dean)Cold electronics (on-going test - add detail)Check position of TPC inside cryostat - move closer to excluder? (Estimated week of Jan. 25, before closing flanges)Close up flange (Estimated week of Jan. 25)
Cosmic Tower¶
Alignment after re-installation?GoodCheck counter's operating voltage after re-installation (needed - it'll take couple of hours)Good
Muon Range stack¶
- Power up, check current draw, and check noise rate is unchanged.
- Upgrade
- Assemble X scintillator paddles with new small PMTs (In progress, Tapasi G. and Pip H.)
- Install X paddles
- Power X paddles
- Cable X paddles to readout
- Incorporate X and Y paddles into trigger logic.
TOF system:¶
- (Jan 25-27)
Stack the two paddles closely, trigger on coincidences, and measure offset. Flip stack and repeat. Average.Save data for re-measurement when more sophisticated templating or CFD-like time measurement methods become available.
- Extend time window for slow protons (Time needed: few hours, can happen any time)
- Possibly change PMTs to reduce difference from upstream to downstream counter (low priority, can happen any time)
Beamline¶
Survey TPC in place.Close cryostat flanges.(Week of Jan. 25?)Remove hydraulic tableReposition collimatorReposition MWPCs, TOF, aerogel, Beam halo, cosmic paddles
Survey everything, especially that which couldn't be surveyed while TPC was open.Re-cable beamline instruments- Test for functionality (Week of Feb. 8)
Beam returns February 5 (originally thought to be Feb. 12!)