Status of IP FB system design
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1 Status of IP FB system design Philip Burrows Douglas Bett, Glenn Christian, Michael Davis, Alexander Gerbershagen*, Colin Perry John Adams Institute Oxford University Robert Apsimon, Ben Constance CERN Javier Resta Lopez U. Valencia P.N. Burrows 1
2 Outline System concept CLIC design status FONT prototype systems performance Recent progress at ATF2 Outlook P.N. Burrows 2
3 LC 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 P.N. Burrows 3
4 CLIC Final Doublet region Elsner P.N. Burrows 4
5 CLIC Final Doublet region Elsner P.N. Burrows 5
6 CLIC Final Doublet region Elsner P.N. Burrows 6
7 IP FB Design Status: CLIC Conceptual design developed and documented in CLIC CDR (2011) NB primary method for control of beam collision overlap is via vibration isolation of the FF magnets, and dynamic correction of residual component motions IP position feedback: allows IP beam position correction of nm of vertical beam motion, and possibility to correct within bunchtrain duration More realistic engineering design can be developed in next project phase P.N. Burrows 7
8 IP FB loop e- kicker BPM FONT amplifier BPM electronics FONT feedback P.N. Burrows 8
9 CLIC prototype: FONT3 at KEK/ATF kicker BPM BPM BPM e- Analogue BPM processor BPM resolution ~ 1um Latency ~ 23ns Drive power > CLIC P.N. Burrows 9
10 LC prototype: FONT5 at KEK/ATF kicker BPM BPM BPM e- Drive amplifier Analogue BPM processor Digital feedback P.N. Burrows 10
11 FONT5 location ATF2 extraction line P.N. Burrows 11
12 FONT5 setup P1 P2 P3 To dump K1 QD10X QF11X K2 QD12X QF13X QD14X QF15X FB board DAQ P2 K1 ( position ) P3 K2 ( angle ) P3 K1 P2 K2 P.N. Burrows 12
13 R&D main aims Demonstration of components suitable for CLIC and ILC FBs, tested with real beam Micron-level stabilisation of beam at entrance to ATF2 final focus ATF2 goal 1: produce 37nm beam spot at IP Nanometer level stabilisation of beam at ATF2 IP using an IP FB ATF2 goal 2 P.N. Burrows 13
14 Ongoing R&D Understanding/improving FB performance: Improving BPM resolution Robert Apsimon PhD thesis further DR extraction kicker timing studies monitoring downstream BPMs + jitter tracking Douglas Bett PhD thesis Design of an ATF2 IP feedback system: Michael Davis PhD thesis P.N. Burrows 14
15 Winter programme Nov/Dec: 2 dedicated shifts in each of 3 weeks March/April: 2 shifts in each of 2 weeks 1) setup, commissioning, BPM resolution, DR extraction kicker timing studies w. 2 bunches 2) re-establish FB, loop/gain studies 3) FB optimisation, downstream stripline BPM + OTR monitoring, simultaneous logging of cavity BPM data P.N. Burrows 15
16 BPM processor resolution tests 3 BPM processors (5,7,10) on BPM P2 25/10/11 8-hour shift: mm expectation from mm ADC noise alone: mm mm mm mm Beam position jitter 3-4 mm P.N. Burrows 16
17 Feedback Performance (example FB Run 6 13/12) bunch 1 2 FB off FB off Jitter P P P.N. Burrows 17
18 Frequency Frequency Feedback Performance (example FB Run 6 13/12) P2 Bunch2 Feedback off - RMS 3.4mm Feedback on - RMS 0.64mm P3 Bunch2 Feedback off - RMS 3.2mm Feedback on - RMS 1mm Bunch offset with respect to mean (microns) Bunch offset with respect to mean (microns) P.N. Burrows 18
19 Feedback Performance (example FB Run 6 13/12) bunch 1 2 FB off on FB off on Jitter P P P.N. Burrows 19
20 Feedback Performance (example FB Run 6 13/12) bunch 1 2 FB off on FB off on Pred. Jitter P correl 98% 0.67 P correl 97% ' P.N. Burrows 20 2 r
21 FONT5 setup Winter P1 P2 P3 To dump K1 QD10X QF11X K2 QD12X QF13X QD14X QF15X MFB1FF FB board DAQ P.N. Burrows 21
22 07/12 FB Run 23 (nom. optics) P.N. Burrows 22
23 Eventual ATF2 IP configuration P.N. Philip Burrows Burrows ATF2 project CLIC MDI meeting 14/1/11 4/5/12
24 IP FB loop e- IP kicker IP cavity BPMs FONT amplifier IPBPM electronics FONT feedback P.N. Burrows 24
25 Eventual ATF2 IP configuration P.N. Philip Burrows Burrows ATF2 project CLIC MDI meeting 14/1/11 4/5/12
26 New kicker Don t (in principle) need much drive for nm-level correction at IP Short kicker OK necessitated by space available Simple proposal: modify stripline BPM design for driving as a kicker use FONT amplifier (plenty of drive) P.N. Burrows 26
27 BPM modified as kicker P.N. Burrows 27
28 New kicker P.N. Burrows 28
29 New kicker P.N. Burrows 29
30 New kicker P.N. Burrows 30
31 Current actual layout P.N. Burrows 31
32 Working assumptions (1) Kicker centre ~ 0.5m upstream of IPBPM Stripline aperture ~ 24 mm Stripline length ~ 12 cm P.N. Burrows 32
33 Working assumptions (2) Dynamic correction range: Beam y jitter ~ beam size (?) 3 sigma correction range: 37nm beam 100nm range 200nrad kick 100nm 300nm 600nrad kick FONT amplifier/kicker provides mrad Amplifier not matched to new BPM-kicker, but will be more than adequate! P.N. Burrows 33
34 Latency estimate Amplifier 35ns Kicker fill (12cm) 0.5ns Beam flight time amplifier IPBPM 2ns Cables (3 x 1.5m?) 23ns IPBPM electronics X Digital FB processing 60ns Total X ns Bunch spacing < 300ns X < 180ns P.N. Burrows 34
35 2-bunch train Intra-train beam feedback requires extremely high degree of spatial correlation between the bunches Better off extracting just 2 bunches Removes requirement for multibunch cavity BPM signal processing for input to FB Increases latency budget available for FB loop December FONT running investigated optimal extraction kicker parameters P.N. Burrows 35
36 y-bpm data studied P.N. Burrows 36
37 P.N. Burrows 37
38 P.N. Burrows 38
39 Summary: ATF2 IPFB Conceptual IPFB design established New kicker has been fabricated Use FONT amplifier to drive kicker Use FONT5 FB board for digitisation + signal processing Measurements indicate good beam quality for 2-bunch mode with up to 300ns bunch spacing Install kicker May + observe beam kick P.N. Burrows 39
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