1. Mike Albrow, FermilabHPS Comments, Manchester 20l0 Some random HPS comments Mike Albrow HPS is accepted in CMS as an R&D project : Physics case is accepted If R&D is successful and funds can be obtained, Stage I likely to be approved. Stage I is 240m + 240m with moving pipes, BPMs, Si tracking and timing, reference timing, trigger and DAQ integrated to CMS. Plan to install in 20|2 – 20|3 shut-down, with 420m installed later (20|6?) Note: In 20|3 cryobypasses to be installed in Pt-3 >>> solved issue. Need to have by end 20|| “first station” ( about |m long) of 4 for |st stage, tested together in beam. Then have ~ a year to “reproduce” 3 times. Tracking ~ 4 x-y layers of pixels (3D or not: to be decided) Timing: | gastof + 2 quartics. (Q+SiPM R&D continues … may be better (rad hardness?)) Pipe & mechanics must be AFP + HPS + LHC collaboration. Need to arrange working meeting soon (Jan?) Combined tests of 3D Si + Timing incl. reference timing ~ Sept 20ll

2. Mike Albrow, FermilabHPS Comments, Manchester 20l0

3. Mike Albrow, FermilabHPS Comments, Manchester 20l0

4. Mike Albrow, FermilabHPS Comments, Manchester 20l0 Cryogenic bypass at 420m to be installed in Pt 3 for collimation ~ Manchester FP420 design

5. Mike Albrow, FermilabHPS Comments, Manchester 20l0 Prototype full station : Valves, flanges, bellows all LHC standard. Moving (Louvain) pipe, windows LHC approved. BPM/movimg mechanism. Assembled as integrated unit. Detectors (3D Si block, GASTOF, QUARTIC) standard mounts (plug in/out) Infrastructure (tracker cooling, cables, motors etc) and local electronics Reference timing between Quartic and Gastof with 300 m tests it in situ. Prototype HPS Station: Final stage of R&D Assemble at CERN (or Fermilab) by end 20II, Full beam test. + R&D on Rad hardness, lifetimes, etc Mike A Nov 30 20I0 ROUGH SKETCH

6. Mike Albrow, FermilabHPS Comments, Manchester 20l0 6 Cherenkov Light at 48 o p Same side: t(A) - t(B) independent of x. (but dx only 2 mm, ~ 15 ps) Opposite side: t(A) + t(B) independent of x t(A) - t(B) ~ 7.5 ps/mm (dx). Tracking can show correlation and show this. Double-Quartic: we give resolution for this and each one separately. TIMING DETECTORS: QUARTIC-1

7. Mike Albrow, FermilabHPS Comments, Manchester 20l0 7 A=15.5 ps B=16.3 ps quadrature combination 11.2 ps Beam at nominal x and 10 mm closer to PMT OS T1 = A-B, cf SS … is it wider (should be + ~ 15ps in quad) Can we get [A+B] resolution using event-by-event formula? Same as simple form? channels Some Results: Remove tails of PH distributions (correlated, probably interactions). Apply time-slewing correction (CFD needs residual PH correction) Fit t(1) – t(2) to Gaussians (good fits):

8. Mike Albrow, FermilabHPS Comments, Manchester 20l0 8 Resolution vs Nbars 5 4 3 2 bars  Bars contribute about equally  Two detectors the same # p.e. ~ 20-25 (5 bars)

9. Mike Albrow, FermilabHPS Comments, Manchester 20l0 9 Further studies: will enable tests of simulations and optimizing designs. Dependence on bar length: (longer is better … further from beams. but chromatic dispersion (more intense blue light slower than red) begins to hurt. Measure: Effect of reducing light spectrum with red-pass and blue-pass filters. Can quartz fiber bundles replace rigid bars? Flexibility in matching dx  PMT pads. Long 150mm bar : PH, N(pe), σ(t) for 3 positions along bar Measured: Red and Blue filters Two fiber bundles BEAM Δσ(t) ~ 1 ps/cm

10. Mike Albrow, FermilabHPS Comments, Manchester 20l0 10 Double Q-bar Quartz (fused silica) bars 6mm x 6mm x 90mm  PHOTEK 210 Mounted at Cherenkov angle θc ~ 48 deg. on opposite sides. dz = 6 mm/sin(48) = 8.1 mm. Some light direct to PMT, ~1/2 TIR to PMT Black “sock” over bars just to avoid light sharing C B A Unfold: σ(A) = 22.3 ps σ(B) = 30.5 ps Includes electronics (~3 ps) and 2 mm beam width smear (A,B) Δt = 2 mm x (10 ps/2 mm) Combining [AB] removes beam spread (later, tracking)

11. Mike Albrow, FermilabHPS Comments, Manchester 20l0 11 σ = 6.04 ch = 18.7 ps Unfold C = 7.7 ps, σ(AB) = 17.0 ps Resolution of double-Q-bar 2 mm x-spread not to be subtracted (only 3 ps electronics) Resolution of Double-Qbar as one device * * Derivation in back-up

12. Mike Albrow, FermilabHPS Comments, Manchester 20l0 Test beam arrangement for one Quartic w/Photonis MCP-PMT Nov 20l0 @ fermilab

13. Mike Albrow, FermilabHPS Comments, Manchester 20l0 Q + SiPM

14. Mike Albrow, FermilabHPS Comments, Manchester 20l0 14 Tests of SiPMs = silicon photomultipliers Eight Hamamatsu SiPMs, 3mm x 3mm In beam with quartz Cherenkov radiators several thicknesses (4 – 12mm), mirrored and not mirrored. Best conditions σ(t) ~ 33 – 37 ps 10-15 photoelectrons Channels Between SiPMs and C. Slewing correction applied

15. Mike Albrow, FermilabHPS Comments, Manchester 20l0 Time difference distribution between Q-bar 4 and SiPM: σ = 29.8 ps  ~ 20 ps for one Q-bar and 15 ps for Q-SiPM Expect ~ 10 ps for an 8-bar Quartic or 4 Q-SiPMs (T.B.D.) PRELIMINARY from Andrew Brandt

16. Mike Albrow, FermilabHPS Comments, Manchester 20l0 2mm x 2mm trigger counter Veto counter with hole BEAM PHOTEK PMT240 6 Q-bars+SiPMs SiPM + Quartz bars

17. Mike Albrow, FermilabHPS Comments, Manchester 20l0 One proton through 6 Q+SiPM bars  DRS4 “scopeguts” 200ps/sample SiPM Trigger counter

18. Mike Albrow, FermilabHPS Comments, Manchester 20l0 proton photons SiPM Quartz bar ~ 3 mm ~ 5 mm Wires (~40V & signal) Schematic of one detector : BEAM x proton Transverse view Detector ring may have x-y position control May rotate to cross-calibrate detectors Beam pipe (vac) Feed- through (SiPM at both ends if two opposite beams) BEAM HINGES Vary spacing of ring supports Varies radius of detector ring Possible support scheme: : halo proton Ring supports LHC Beam Halo Monitor based on FP420 R&D ? (testing at CERN)

19. Mike Albrow, FermilabHPS Comments, Manchester 20l0 Longer term possibility? “GHz Streak Camera” MGA + Vic Scarpine + ? Manfred Wendt et al (Acc.Div.) In principle could solve issue of multiple p in bunch, MCP lifetime Cherenkov photons QUARTZ WINDOW (vac) PHOTOCATHODE MCP: G~100? FOCUSING TRIPLET MS? ES? SWEEPING ELECTRODES X & Y 400 MHz LHC-RF Si PIXEL DETECTOR (Std. CMS) VACUUM ~ 10 p.e. ~ 1000 e. ~ 5kV? 10 kV? Time  Position. No optimization!  2.5 ns/sweep. Could step up x4 to 1.2 GHz  830 ps sweep, ~ 200 pixels LHC RF is reference time >>> Δt ~ ΔØase. To be simulated.

20. Mike Albrow, FermilabHPS Comments, Manchester 20l0 SUMMARY We make progress. HPS CMS