Working Group F:Diagnostics and

Instrumentation for High-Intense Beams – Summary –

Manfred Wendtfor the Working Group F contributors

8/29/2008 HB2008 WG F: Diagnostics Summary

1

WG F: Overview

• Presentations and Discussion:– 3 sessions, 330 min total– 13 presentations.

Thanks to the speakers(!), and to all participants!– Discussions between presentations– Joint discussion with Working Group D: Operations

• Hot Topics:– Beam loss monitoring (10-6-10-7) and MPS!– Transverse beam profile / emittance measurement– Novel, non-invasive beam monitors

(e.g. IPM, H- laser wire, e-beam profile monitor)– Transverse and longitudinal beam halo / tails– Save and reliable operation of high intense beam.– Overview on beam diagnostics of current, and future facilities.

8/29/2008 HB2008 WG F: Diagnostics Summary 2

SCL

1 2 3 4 5 321712 13 14 15

250 m 227 m 25 m160 m

LR Laser room

Laser wire station

Cryomodule number

Camera

Mirror

Power meter32

LR

Ring

S. Assadi: SCL Laser Wire System

CCLDTL

Target

MEBT

• 4 LW from 200 MeV

• 4 LW from 450 MeV

• 1 LW at 1 GeV8/29/2008 3HB2008 WG F: Diagnostics Summary

600750

MCP

Phosphor screen

Photo camera

Layout of the proposed EBP for SNS Accumulator Ring by BINP

Electron Gun

DeflectorQuadrupole

lens

Proton beam

S. Assadi: e-Beam Profile Monitor

8/29/2008 4HB2008 WG F: Diagnostics Summary

C. Allen: Noisy Wire Profiles

8/29/2008 HB2008 WG F: Diagnostics Summary 5

0 20 40 60 800.00

0.05

0.10

0.15

0.20

k

mk

Measurement

0 20 40 60 800.00

0.05

0.10

0.15

0.20

k

f k,m

k Measurement and fit

0 10 20 30 40 500.00

0.05

0.10

0.15

0.20

0.25

0.30

k

mk Measurement

0 20 40 60 800.00

0.05

0.10

0.15

0.20

k

f k,m

k

G auss ian R econs t ruct ion and C omp uted

80 points

0 10 20 30 40 500.00

0.05

0.10

0.15

0.20

0.25

0.30

k

f k,m

k Measurement and fit

0 10 20 30 40 500.00

0.05

0.10

0.15

0.20

0.25

0.30

k

f k,m

k

G auss ian R econs t ruct ion and C omp uted

Only 50 points

0 20 40 60 80 0.10

0.05

0.00

0.05

0.10

0.15

k

mk

Measurement

0 20 40 60 80 0.10

0.05

0.00

0.05

0.10

0.15

k

f k,m

k

Measurement and fit

M. Wendt: Future Accelerator Diagnostics

8/29/2008 HB2008 WG F: Diagnostics Summary 6

µ-to-e MTA beam-line

HINS

NML

NOvA

Project X(8 GeV SCRF linac)

DUSELbeam-line

Cold BPM for the Project X Cryomodule

8/29/2008 HB2008 WG F: Diagnostics Summary 7

ILC type cold CM-free L-Band cavity BPM

cavity

waveguide

1.0 1.2 1.4 1.6 1.8 2.00.00

0.01

0.02

0.03

Dipole-like

Dipole

Am

plit

ud

e

Frequency (GHz)

Monopole

FFT for y port signal

Project X / NML type cold CM-free L-Band cavity BPM

T. Toyama: PropChamber Loss Monitors

8/29/2008 HB2008 WG F: Diagnostics Summary 8

800 mm

Anode wire 50 m Pt

HV cathod I.D. 23 mm stainless steel

Effective areaAr 99% + CO2 1%: 1.1 atm

Sensitivity

200 nC / rad x gain (calculation)

gain ~ 60000 (~2 kV)

RG59/u 8DFB

Cosmic ray

point-like loss <100ns@3-50BT collimator

Saturation of the processing circuit, NOT of the head (?)

To be checked

Preliminary

A. Zhukov: SNS BLM System

Argon filled, 113 cc volume, 2 kV bias.

Response 70 nC/Rad

Slow ~1 μS (charge collection)

8/29/2008 HB2008 WG F: Diagnostics Summary 9

Scintillator

PMT

Response 50 pC/MeV

Fast ~10 nS

1 mS

X-ray

Beam loss

• Scintillator / PMT– For low use at beam energies– Cavity X-ray sensitive

• Noise Problems with BLM signals

B. Pellico: Fermilab Booster Diagnostics

• MI-8 beam-line WCM & fast scope• Data analysis software provides

– Bunch intensity, length, phase– Longitudinal modes– Mtn. range, contour, xy-plots

8/29/2008 HB2008 WG F: Diagnostics Summary 10

Mode Line

Bunch Intensity

Bunch Length

T. Gorlov: SNS Allison Scanner

8/29/2008 HB2008 WG F: Diagnostics Summary 11

Distribution of current in phase space obtained by

the scannerI(x,x’)

Measurements of rms emittance and Twiss parameters

Computation without space charge

Computation with space charge

Original Gaussian emittance distribution

error=2.5 % error=17.5 %

J. Pozimski: Beam Diagnostics at RAL

8/29/2008 HB2008 WG F: Diagnostics Summary 12

I. Aliseda: HEBT Diagnostics for IFMIF

• International Fusion Materials Irradiation Facility

– Characterization of materials

– High neutron flux (1018 n/m2/sec)

– Early design stage

8/29/2008 HB2008 WG F: Diagnostics Summary 13

P. Garin, IFMIF: status and developments, EPAC08, p. 974 (2008)

Neutron flux density

Beam footprint at interaction point

Accelerator Target Irradiation module

Heat extraction by fast liquid Li

D+

Li fluxSamples

neutrons~1017 n/s

2 acc. In parallel

EM bomb

Heat exchanger

Deuterons: 40 MeV 250 mA (10 MW)

20-50 dpa/y in 0.5 lT: 250<T<1000℃

Facility availability >70%

20 cm

5 cm

C. Deibele: SNS Wideband FB System

• PA: 1-300 MHz, 400 W, class A

• Stripline kicker, pickup

• Digital FB electronics

8/29/2008 HB2008 WG F: Diagnostics Summary 14

Anti-aliasing Filters

Pickup Top

Pickup Bottom

Amps

ADC Delay

Comb Filter Comb Filter FIR Filter

DAC

Σ

Δ

Σ

Δ

Kicker Top

Kicker Bottom

Amps High Imp

Bypass Bypass

Gain

Programmable

Triton Board

Equalizer

Timing system

DCM (Digital Clock Manager)

Ring Frequency Harmonic

10 uC

e-p instability

S. Payne: Beam Diagnostics at ISIS

8/29/2008 HB2008 WG F: Diagnostics Summary 15

Fibre bundles

PXI System

• Commercial read-out hardware– Reliability issues– Hard disk locks up

8/29/2008 HB2008 WG F: Diagnostics Summary 16

0 2 4 6 8 10 0 2 4 6 8 10

5 6 7

Dipole 2 Straight 2Straight 1

2 3 4

10

98R2BLM2 R2BLM3

PM tube 1

K. Satou: J-PARC MR Diagnostics (IPM)

• Ion collection with HV

• 35kV for day-one 　⇒　 will be upgraded to 50kV

• Electron collection with magnetic field

• Require for 0.75MW beam profile measurement ⇒ future plan

• Micro Channel Plate (MCP) for signal read out device

• 2 stage MCP assembly with 32 ch strip anode

• Active area: 31×81 mm2

• Width of each anode: 2.5 mm

• Gain: ~10 6

• Calibration devise to check MCP gain balance

• Electron generator arrays ⇒ Photonis Ltd.

• Need averaging to reduce the statistical error due to number of detected ions

• Number of ions is about a several 10000 per bunch for designed beam, that is only a several hundreds for day one beam

• Even for designed beam, we need averaging to measure beam tail region in good resolution

8/29/2008 HB2008 WG F: Diagnostics Summary 17

130mm

35kV 33kV

EGA

MCP

Electrode

Voltage divider100MΩ resister

Ceramic bushing

HV feedthrough

Cross section of V-IPM

Average=100time

Anode position (mm)

1000turn

999turn

998turn

Turn by turn beam profile

80 mm

997turn5μ s

Average=100time

Anode position (mm)

1000turn

999turn

998turn

Turn by turn beam profile

80 mm

997turn5μ s

S. Childress: Beam Diagnostics for 2 MW 120 GeV

8/29/2008 HB2008 WG F: Diagnostics Summary 18

~1 E-5

Loss from profile monitor

Extraction

• Primary Beam Loss – Mixed Mode (NuMI beam ~300 kW)– Average per pulse for one month

WG D & F: Joint Discussion

• Recording of Radiation dosimetry from machine startup– Compare BLMs and TLDs

• Beam loss monitoring– BLM coverage

– Compare BLMs and power losses

– Calibrate BLMs with tiny beams under controlled, forced beam loss conditions

– Monitoring of the beam on the target• High radiation levels, camera lifetime• Phosphor coating (non-linearites), tungsten mesh, thermal imaging

• Beam halo– IPMs (J-PARC) with dedicated MCPs for beam core and tails, 10-4 sensitivity

• IPM issues: e-cloud, upstream beam losses

– Crawling wire and BLM

– Crystal collimator (bending, reflection of beam halo)

– BLM calibration using thin multiwires in the 10-6 – 10-7 regime

• Longitudinal bunch distribution, phase space measurements– Wire at fixed position (resolve arrival time), electro-optical sampling(?)

• Beam gap monitoring (10-9, beam gap extraction -> BLM)

• Long term stability of BPM data (automatic calibration systems)

8/29/2008 HB2008 WG F: Diagnostics Summary 19