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Philip Burrows CLIC MDI Meeting 6/11/091 Design issues for IP intra-train feedback Philip Burrows John Adams Institute Oxford University.

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Presentation on theme: "Philip Burrows CLIC MDI Meeting 6/11/091 Design issues for IP intra-train feedback Philip Burrows John Adams Institute Oxford University."— Presentation transcript:

1 Philip Burrows CLIC MDI Meeting 6/11/091 Design issues for IP intra-train feedback Philip Burrows John Adams Institute Oxford University

2 Philip Burrows CLIC MDI Meeting 6/11/092 Outline General considerations for intra-train feedback system ILC RDR layout Engineering integration issues Prototype hardware (FONT systems) Summary

3 Philip Burrows CLIC MDI Meeting 6/11/093 IP intra-train feedback system - concept Last line of defence against relative beam misalignment Measure vertical position of outgoing beam and hence beam-beam kick angle Use fast amplifier and kicker to correct vertical position of beam incoming to IR FONT – Feedback On Nanosecond Timescales (JAI/Oxford, Valencia, CERN, DESY, KEK, SLAC)

4 Philip Burrows CLIC MDI Meeting 6/11/094 FONT Team JAI/Oxford: Philip Burrows Glenn Christian Hamid Dabiri Khah Javier Resta Lopez Colin Perry Graduate students: Christina Swinson Ben Constance Robert Apsimon Douglas Bett Alexander Gerbershagen

5 Philip Burrows CLIC MDI Meeting 6/11/095 General considerations (1) 1. IP position feedback: hardware located near IP kicker at 90 degrees w.r.t. IP 2. IP angle feedback: hardware ideally located near IP kicker in phase w.r.t. IP 3. Additional possibilities: (bunch-by-bunch) luminosity scan system (from BEAMCAL) information from alignment systems (eg. QD0 etc.) ‘feed-forward’ information from upstream in machine (eg. DR) …

6 Philip Burrows CLIC MDI Meeting 6/11/096 General considerations (2) Time structure of bunch train: ILC (500 GeV): c. 3000 bunches w. c. 300 ns separation CLIC (3 TeV): c. 300 bunches w. c. 0.5 ns separation Feedback latency: ILC: O(100ns) latency budget allows digital approach CLIC: O(10ns) latency requires analogue approach Recall speed of light: c = 30 cm / ns: FB hardware should be close to IP (especially for CLIC!)

7 Philip Burrows CLIC MDI Meeting 6/11/097 IP position feedback latency Designed for (bunch-by-bunch) position correction of beams at IP Latency: 1. Beam flight time IP  BPM 2. Signal processing, FB calculation 3. Amplifier + kicker response time 4. Cable delays 5. Beam flight time kicker  IP 1 3 2 5 4

8 Philip Burrows CLIC MDI Meeting 6/11/098 Latency issues BPM or kicker further from IP  longer beam flight distance  increase latency (3ns per metre) Electronics further from beamline  longer cable runs  increase latency (4-5ns per metre) FB system electronics latency

9 Philip Burrows CLIC MDI Meeting 6/11/099 ILC RDR Design (schematic) 1. IP position feedback: provide IP beam position correction at +- 50 sigma_y level i.e. +- 300 nm of vertical beam motion at IP 2. IP angle feedback: hardware located few 100 metres upstream conceptually very similar to position FB, (arguably) less critical 3. Bunch-by-bunch luminosity signal (from BEAMCAL) ‘special’ systems requiring dedicated hardware + data links

10 Philip Burrows CLIC MDI Meeting 6/11/0910 IP feedback engineering considerations System component locations + specs listed in ILC RDR

11 Philip Burrows CLIC MDI Meeting 6/11/0911 Opening 2 m on the beam Spool tubes Reacting bars QF QD0 Cam/support Final Doublet Region (SiD for illustration) - Oriunno

12 Philip Burrows CLIC MDI Meeting 6/11/0912 Opening 2 m on the beam Spool tubes Reacting bars QF QD0 Cam/support Final Doublet Region (SiD for illustration) - Oriunno

13 Philip Burrows CLIC MDI Meeting 6/11/0913 IP feedback engineering considerations System component locations + specs listed in ILC RDR No detailed engineering work done in terms of: actual designs of BPM and kicker integration into beamline design However, components are envisaged to be ‘standard’: Stripline BPM c. 10-20cm long (ATF: 12.5cm) Stripline kicker c. 30-60cm long (ATF ~ 30cm) Stripline radius c. 1-2cm (ATF ~ 1cm) Probably want to customise designs to fit into tight beamline environment

14 Philip Burrows CLIC MDI Meeting 6/11/0914 BPM engineering issues Connections to BEAMCAL, QD0 cryostat? Bellows? Alignment/mover system? Shorten pickoffs? Electronics off to side and shielded? Define cable runs: door opening, push-pull?

15 Philip Burrows CLIC MDI Meeting 6/11/0915 Opening 2 m on the beam Spool tubes Reacting bars QF QD0 Cam/support Final Doublet Region (SiD for illustration) - Oriunno

16 Philip Burrows CLIC MDI Meeting 6/11/0916 Kicker engineering issues Real-estate more generous Does warm section move with detector in push-pull? Amplifier detector-side or machine-side of break? Flanges, bellows, at both ends? Shorten pickoffs?

17 Philip Burrows CLIC MDI Meeting 6/11/0917 Amplifier engineering issues FONT4 amplifier performance: Kicker 30cm long, 2cm aperture, 1kW drive 100 nrad deflection (250 GeV beam) lever arm 4m +- 400 nm at IP ( > 50 sigma_y) Kick ~ l, 1/r, sqrt(P), 1/p …

18 Philip Burrows CLIC MDI Meeting 6/11/0918 Feedback Instrumentation & Vacuum Design (Malyshev, Oriunno) Present vacuum requirements : P < 1nT in the BDS P < 100nT in the experimental region We may rely on the cryopumping from QD0 We do not need extra pumps We do not need periodic bake out in situ. Open point : The beam instrumentation required Shut-off valves QD0 Stationary L<1 m IP BPM Kicker Integration study Moves with Detector

19 Philip Burrows CLIC MDI Meeting 6/11/0919 CLIC_ILD Detector Concept: Forward Region Version 3 Nov. 2009 (by Andr é Sailer) ECal end-capHCal end-capYoke end-cap (partial) LumiCalBeamCalQD0 (partial)

20 Philip Burrows CLIC MDI Meeting 6/11/0920 CLIC_ILD Detector Concept: Forward Region Version 3 Nov. 2009 (by Andr é Sailer) ECal end-capHCal end-capYoke end-cap (partial) LumiCalBeamCalQD0 (partial)

21 Philip Burrows CLIC MDI Meeting 6/11/0921 Summary of engineering issues Several prototype intra-train feedbacks developed by FONT – see next Detailed mechanical/integration engineering needs to be done for ILC and more work on conceptual design for CLIC Radiation environment for BPM electronics, feedback electronics, kicker amplifier: radiation tolerance, locations, shielding … EM interference: Pickup on BPM or kicker Broadcast RF (eg. to detector!) Ground loops Interface to BEAMCAL for luminosity scan system

22 Philip Burrows CLIC MDI Meeting 6/11/0922 ILC feedback prototype status

23 Philip Burrows CLIC MDI Meeting 6/11/0923 KickerBPM 1 Digital feedback Analogue BPM processor Drive amplifier BPM 2 BPM 3 e- FONT4 ILC prototype at KEK/ATF 3 bunches, 140-154ns spacing 1.3 GeV

24 Philip Burrows CLIC MDI Meeting 6/11/0924 KickerBPM 1 Digital feedback Analogue BPM processor Drive amplifier BPM 2 BPM 3 e- FONT4 ILC prototype at KEK/ATF

25 Philip Burrows CLIC MDI Meeting 6/11/0925 FONT4 basic operation demonstrated in 2008 running: beam feedback along single axis (y) with few micron resolution FONT status

26 Philip Burrows CLIC MDI Meeting 6/11/0926 CLIC feedback prototype status

27 Philip Burrows CLIC MDI Meeting 6/11/0927 NLCTA: 65 MeV beam, 170ns train, 87ps bunch spacing FONT1 (2001-2): First demonstration of closed-loop FB: latency 67ns 10/1 beam position correction FONT2 (2003-4): Improved demonstration of FB: latency 54ns real time charge normalisation with logarithmic amplifiers beam flattener to straighten train profile solid-state amplifier ATF: 1.3 GeV beam, 56ns train, 2.8ns bunch spacing FONT3 (2004-5): Ultra-fast demonstration of FB: latency 23 ns 3 stripline BPMs high-power solid-state amplifier FONT Prototype Analogue Feedback Systems

28 Philip Burrows CLIC MDI Meeting 6/11/0928 FONT2 beamline installation at SLAC NLCTA (65 MeV 170ns-long train @ 87ns spacing) Dipole and kickers BPMs

29 Philip Burrows CLIC MDI Meeting 6/11/0929 FONT2 results: feedback BPM Feedback on Beam flattener on Beam starting positions Delay loop on beam startbeam end 123 4

30 Philip Burrows CLIC MDI Meeting 6/11/0930 FONT3 ATF: 1.3 GeV beam, 56ns-long train @ 2.8ns spacing Adjustable-gap kicker BPM ML11X Feedbac k Superfast BPM processor Superfast amplifier BPM ML12X BPM ML13X Aim: TOTAL latency < 20 ns

31 Philip Burrows CLIC MDI Meeting 6/11/0931 FONT3: latency budget Time of flight kicker – BPM: 4ns Signal return time BPM – kicker: 6ns Irreducible latency: 10ns BPM processor: 5ns Amplifier + FB: 5ns Electronics latency: 10ns Total latency budget: 20ns Allows 56/20 = 2.8 periods during bunchtrain

32 Philip Burrows CLIC MDI Meeting 6/11/0932 FONT3: Beamline Installation

33 Philip Burrows CLIC MDI Meeting 6/11/0933 FONT3: Results (June 3 2005) 40 pulses per position setting

34 Philip Burrows CLIC MDI Meeting 6/11/0934 FONT3: Results (June 3 2005) : Delay-loop feedback w. latency 23 ns 56ns bunchtrain FB on FB + delay loop on 23ns 200um

35 Philip Burrows CLIC MDI Meeting 6/11/0935 FONT1,2,3: Summary 67 ns 54 ns 23 ns Fast enough for CLIC intra-train FB!

36 Philip Burrows CLIC MDI Meeting 6/11/0936 Other updates Since CLIC Workshop Javier Resta Lopez has updated the luminosity performance simulations: Improved ground-motion study IP intra-train FB + BDS (slow) orbit SVD FB Integrated luminosity recovery over bunchtrain duration Slides appended to today’s meeting page – suggest future presentation Beam-related backgrounds (e+e-, photons) produced near IP are a major source of concern for CLIC FB hardware T-480 experiment using SLAC 30 GeV beam to create huge flux of EM backgrounds in a material model of IR – worth future presentation

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