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

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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.