Post on 29-Jan-2016
INTRODUCTIONRECYCLER BPM – Original system not adequate to measure beam position precisely. It is being upgraded to meet the required physics precision. Expected to be ready by end of FY03.
MAIN INJECTOR BPM – Original system 20+ years old. Not able to see beams with different time structures. Physics requirements have been defined for the upgraded system. Technology review to take place. Expected by the end of 03.
FLYING WIRE IN RR – Not part of the original system. Built to detect emittance growth during beam transfer and to measure emittance of the stacked beam. System is being commissioned.
DAMPERS IN MI and RR – Please see the definition on DAMPER page. System to be being commissioned in FY03.
2.5MHz ACCELERATION – Produce pbar bunches of eL< 2eVs & intensity ~6E10/bunch for Tevatron ppbar operation. Study in progress.
RECYCLER BPM
Split tube BPM Design
End View
Top View
COURTSEY – JIM CRISP
400mA 400mA
30mA
MEASUREMENT PRECISION OVER THE FULL DYNAMIC RANGE FOR RR
Absolute - True position relative to the center of the BPM. (Covers long term stability, intensity dependence & spectral dependence.)
1.00 mm 5% of the actual position.
Relative - Difference between two measurements on subsequent turns with stable beam. (Covers short term stability and resolution).
0.40 mm
This is 3or ~99.73% of the measurement should be within these limits.
BEAM POSITION MEASUREMENT PRECISION WITH DDC CARD IN RR
HP426RMS=19m
VP427RMS=9m
HP428RMS=18m
VP429RMS=13m
MAIN INJECTOR BPMs
MI Ring BPM
Large Aperture BPM
Aperture 4.625”/1.9”
Aperture 4.625”
1 Protons or anti-protons to/from the RR, and anti-protons from the Accumulator (2.5 MHz)
0.5E10/bunch (2.0E10 total) to 7.5E10/bunch (30E10 total). t)= 25ns to 50ns.
2 Protons from the Booster
(53MHz) (19ns spacing)
From 1 to 84 bunches. Min. Intensity = 0.5E10/bunch. Max. Intensity = 12E10/bunch
3 Protons to the Tevatron
(5-9 bunches, typically 7)
(53 MHz) (19 ns spacing)
Up to 30 Booster bunch for tune up. Each bunch intensity between 1-12E10. For Collider running – up to 4.5E10/bunch or 30E10 after coalescing. (27E10 – TeV Run IIB doc.)
4 Anti-Protons to(from) the Tevatron. (53 MHz bunch in 2.5 MHz spacing).
36 single bunches, 4 bunches each in 9 separate batch (4X9), each bunch with intensity of 11E10(5E10). (9.4E10 – TeV Run IIB doc.)
5 For the Fixed Target Running. (including NuMI/MINOS) (53MHz)
0.5E10 to 12E10 per bunch for 50-504 bunches.
MI DYNAMIC RANGE
MEASUREMENT PRECISION OVER THE FULL DYNAMIC RANGE IN MI
This is a 3 requirement, or 99.73% of the measurements should be within these limits.
Position Accuracy – 0.40mm 5% of the actual position.
Difference between two measurements on pulses with stable beam. It covers long term stability and resolution.
Calibration precision of – 0.20mm ± 1.25% of the the actual position
DDC TEST RESULTS w/53MHz BEAM
Courtesy: WARREN SCHAPPERT
Sample Number – 17ns Sampling
Raw ADC
Sampling of 84 consecutive 53MHz(19ns) waveform at every 17ns (60MHz clock). Under Sampled. But due to long train of pulses (84 bunches) one can get away with under sampling.
Beam moving around.
Measured resolution is 0.18% of the aperture.
Intrinsic resolution of the BPM will be better than the number presented here.
FLYING WIRE FORK ASSEMBLY FOR THE RECYCLER SYSTEM
Resolver
Motor
High Vacuum Feedthrough
30m Carbon Fiber Wire
FORK
SYSTEM IS BEING COMMISSIONED
HORIZONTAL FLYING WIRE IN THE RECYCLER RING
RECYCLER BEAM PIPE
FLYING WIRE CAN
ION PUMP
TITANIUM SUBLIMATION PUMP
Motivation : Produce pbar bunches of l<2eVs & intensity ~6E10/bunch for Tevatron ppbar operation
Status: • Studies have been conducted using
four short batches of protons from the Booster
• Produced 2.5 MHz bunches at 8 GeV• Open-loop acceleration to transition
energy using 2.5 MHz RF system • Carried out bunch rotation at 27
GeV and four bunches are accelerated to 150 GeV
Work in Progress: • LLRF for 2.5MHz bunch PHIS and
RPOS controls• 2.5MHz and 53MHz RF Beam-
loading compensation system during acceleration
Pba
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eam
Inj
ecti
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(Fro
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Tra
nsit
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Bun
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otat
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unch
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rm
25M
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Pba
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2.5 MHz Acceleration
53MHz
Acceleration
MI Ramp used for the 2.5MHz Acceleration and stages of Beam 0peration
2.5 MHz PBAR ACCELERATION IN MI
Injection
Beam close to Transition
Beam in 2.5MHz bkts
Mountain Range of 2.5 MHz Acceleration up to Transition Energy
Beam Acceleration with 2.5 MHz RF system on a Slow Ramp Beam Acceleration from 27 to 150 GeV on a Fast Ramp
Wall Current Monitor data with SBD
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BEAM DATA FOR 2.5MHz AND 53MHz ACCELERATION SHOWN SEPARATELY
DAMPERS IN THE MI & RRAll MI dampers are controlled by a single digital filter card with a large FPGA (EchoTek)
Longitudinal
Remove coupled-bunch oscillations in beam from Booster
Prevent growth of coupled-bunch instabilities in the MI
Allow bunch rotation to be effective on stacking cycles
Increase coalescing efficiency and reduce momentum spread in TeV
Transverse
Reduce emittance growth from injection steering errors
Reduce any residual emittance growth during the ramp
Permit MI operation at increased intensity for NuMI
53 MHz, TCLK, MDAT,...
Monster FPGA(s)
MinimalAnalogFilter
FASTADC
Stripline Pickup
MinimalAnalogFilter
FASTADC
14
VME
106 / 212 MHz
Stripline Kicker
PowerAmp
MinimalAnalogFilter
FASTADC
Resistive Wall Monitor
Broadband Cavity
FASTDACs
> 27 MHz
FASTDACs
PowerAmp
TransverseDampers
IdenticalX & Y
Longi-tudinal
(Z)Damper
2-10
2-10
ALL-COORDINATE DAMPER WITH ECHOTEK CARD
MI TRANSVERSE BUNCH BY BUNCH DAMPERS -RESULTS
Damping kick shared for Bunches #41 - #51
Pickup Signal from Bunch #43
Ashmanskas, Foster, Wildman, Schappert, Crisp, Nicklaus
CAN ALSO ANTI-DAMP TO BLOW SELECTED BUNCH OUT OF THE MACHINE
TURN NUMBER AFTER INJECTION
BPM
KICKER
Arbitrary Betatron Phase of Kicker can be accommodated
THREE TURN FILTER FOR TRANSVERSE DAMPER
Damper kick is calculated from a single BPM position reading on three successive turns.