specifications for psb injection system upgrade c. bracco, j. abelleira on behalf of btp...

Specifications for PSB Injection System UpgradeC. Bracco, J. Abelleira on behalf of BTP

Acknowledgments: E. Benedetto, C. Carli, V. Dimov, L.M. Feliciano, V. Forte, G. Grawer, E.B. Holzer, A. Lombardi, B. Mikulec, F. Roncarolo, G.

Rumolo, W. Weterings, F. Zocca

2

Outlines

• Optics and beam parameters at different systems

• KSW painting schemes • Studies for foil and half-sector test • Status- what is missing (for HW production) -

issues?

10/11/2011 Review on PSB 160 MeV H- Injection

3

Linac4 Optics


Optics parameters at PSB injection:

Case bT,H (m) aT,H bT,V (m) aT,V (m) DTH (m) DTH’ DTV (m) DTV’

All matched(medium) 5.5 6.5e-5 3.7 9.6e-5 -1.4 0 0 0

4

Linac4 Optics





< 25 mm

< 50 mm

0.4

0.4

5

Linac4 Optics





< 34 mm

< 16 mm

0.4

0.4

6

TargetDTV = DTV’=0For all optics (Ring 3)DTV = 0.25 m in Ring 1

A. Lombardi: https://edms.cern.ch/document/1391781/0.1

Linac4 Optics


https://edms.cern.ch/document/1391781/0.1


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Target A. Lombardi: https://edms.cern.ch/document/1391781/0.1

Linac4 Optics


Case bT,H (m) aT,H bT,V (m) aT,V (m) DTH (m) DTH’

All matched(medium) 5.13 2.11e-1 4.97 2.54e-2 -1.4 0

Zero disp. 5.13 2.11e-1 4.97 2.54e-2 0 0

D matched Small b’s 2.51 -6.68e-2 2.02 -9.37e-2 -1.4 0

Zero dispersionSmall b’s 2.51 -6.68e-2 2.02 9.37e-2 0 0

D matched Large b’s 9.36 -3.46e-2 7.01 3.62e-2 -1.4 0

Zero dispersionLarge b’s 9.36 -3.46e-2 7.01 3.62e-2 0 0

Obtained

DTV = DTV’=0For all optics (Ring 3)DTV = 0.25 m in Ring 1



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Beam size at BI.DIS, horizontal small medium largeBeam beta max m 26.50 31.40 28.1normalised emittance pi*mm*mrad 4.00E-01 4.00E-01 4.00E-01betagamma 6.08E-01 6.08E-01 6.08E-01beam size (4 s envelope) mm 1.67E+01 1.82E+01 1.72E+01Beam Disp. m 0.10 0.10 0.10Max Dp/p 4.00E-03 4.00E-03 4.00E-03Maximum momentum displacement mm 4.00E-01 4.00E-01 4.00E-01r.m.s. orbit displacement mm 2.00 2.00 2.00Mechanical tolerance mm 1.00 1.00 1.00Max. beam envelope mm 20.10 21.58 20.60 <25

Beam size at BI.DIS, vertical small medium largeBeam beta max m 13.70 20.60 21.40normalised emittance pi*mm*mrad 4.00E-01 4.00E-01 4.00E-01betagamma 6.08E-01 6.08E-01 6.08E-01beam size (4 s envelope) mm 1.20E+01 1.47E+01 1.50E+01Beam Disp. m 1.50E+00 1.50E+00 1.50E+00Max Dp/p 4.00E-03 4.00E-03 4.00E-03Maximum momentum displacement mm 6.00E+00 6.00E+00 6.00E+00r.m.s. orbit displacement mm 10.00 10.00 10.00Mechanical tolerance mm 1.00 1.00 1.00Max. beam envelope mm 29.0 31.7 32.0 <50


Linac4 OpticsMatched Dispersion

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Beam size at BI.SMV, horizontal small medium largeBeam beta max m 54.90 42.2 28.9normalised emittance pi*mm*mrad 4.00E-01 4.00E-01 4.00E-01betagamma 6.08E-01 6.08E-01 6.08E-01beam size (4 s envelope) mm 2.40E+01 2.11E+01 1.74E+01Beam Disp. m 1.00E-01 1.00E-01 1.00E-01Max Dp/p 4.00E-03 4.00E-03 4.00E-03Maximum momentum displacement mm 4.00E-01 4.00E-01 4.00E-01r.m.s. orbit displacement mm 2.00 2.00 2.00Mechanical tolerance mm 1.00 1.00 1.00Max. beam envelope mm 27.4 24.5 20.8 <34

Beam size at BI.SMV, vertical small medium largeBeam beta max m 9.25 7.30 7.52normalised emittance pi*mm*mrad 4.00E-01 4.00E-01 4.00E-01betagamma 6.08E-01 6.08E-01 6.08E-01beam size (4 s envelope) mm 9.87E+00 8.77E+00 8.90E+00Beam Disp. m 1.00E+00 1.00E+00 1.00E+00Max Dp/p 4.00E-03 4.00E-03 4.00E-03Maximum momentum displacement mm 4.00E+00 4.00E+00 4.00E+00r.m.s. orbit displacement mm 2.00 2.00 2.00Mechanical tolerance mm 1.00 1.00 1.00Max. beam envelope mm 16.9 15.8 15.9 <16


Linac4 OpticsMatched Dispersion

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Beam size at BI.SMV, horizontal small medium largeBeam beta max m 54.90 42.2 28.9normalised emittance pi*mm*mrad 4.00E-01 4.00E-01 4.00E-01betagamma 6.08E-01 6.08E-01 6.08E-01beam size (4 s envelope) mm 2.40E+01 2.11E+01 1.74E+01Beam Disp. m 1.00E-01 1.00E-01 1.00E-01Max Dp/p 4.00E-03 4.00E-03 4.00E-03Maximum momentum displacement mm 4.00E-01 4.00E-01 4.00E-01r.m.s. orbit displacement mm 2.00 2.00 2.00Mechanical tolerance mm 1.00 1.00 1.00Max. beam envelope mm 27.4 24.5 20.8 <34

Beam size at BI.SMV, vertical small medium largeBeam beta max m 9.25 7.30 7.52normalised emittance pi*mm*mrad 4.00E-01 4.00E-01 4.00E-01betagamma 6.08E-01 6.08E-01 6.08E-01beam size (4 s envelope) mm 9.87E+00 8.77E+00 8.90E+00Beam Disp. m 1.00E+00 1.00E+00 1.00E+00Max Dp/p 4.00E-03 4.00E-03 4.00E-03Maximum momentum displacement mm 4.00E+00 4.00E+00 4.00E+00r.m.s. orbit displacement mm 2.00 2.00 2.00Mechanical tolerance mm 1.00 1.00 1.00Max. beam envelope mm 16.9 15.8 15.9 <16


Linac4 OpticsMatched Dispersion Ongoing studies:

MADX calculations to define optics parameters along the BI-TL for all optics and rings (no Space Charge included!!)

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Beam Envelope injection Region


Matched Dispersion & Large Beta (LHC circulating Beam)

s [mm]

x [m

m]

BSW4

BSW3 BSW2

BSW1

injected beam H-

H-

H0 Dum

p

Strip

ping

foil

Strip

ping

foil

Circulating beam

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Beam Envelope injection Region


s [mm]

x [m

m]

BSW4

BSW3 BSW2

injected beam H-

H-

H0 Dum

p St

rippi

ng fo

il

Matched Dispersion & Large Beta (LHC circulating Beam)

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Beam Size at Dump


Beam spot size (1 sx,y) and location of the H0 and H- beams at the H0/H- PSB dump in case of zero dispersion and/or no longitudinal painting smallest beam highest energy density: 1.8 mm x 1.4 mm (0.80% matched functions and 0 Dispersion)

Small_beta optics in both planes: 1.3 mm x 1.2 mm 40% smaller spot size at the dump. Small vertical beta is not “interesting” from an operational point of view. More realistic option: bx = 2.51 m and by = 4.97 m 1.3 mm x 1.8 mm

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(for LHC beams even if Dx = -1.4 !)

Full horizontal beam size

Medium_beta Small_beta Large_beta

DHT = -1.4 28.5 25.5 32.7

DHT= 0 16.1 13.2 20.3

Full vertical beam sizeMedium_beta Small_beta Large_beta

43.9 41.2 47.6

H100.4

0.6087.171.4

0.00446.16

12

±16.332.7

V8

0.40.608

6.4123650.25

0.00446.41

10±23.847.6

Example

Beam Size at Foil


Beta [m]Normalised emittance [mm mrad]betagamma98% beam sizeD [m]Max Dp/pMax momentum displacement [mm]Delivery precision [mm]Maximum offset for painting [mm]Max. injected beam envelope [mm]Full beam envelope [mm]

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Painting with KSW

Original design for KSW transverse painting

35 mm

-9.2 mm(1/5 BSW bump)

1 ms

I1I2

t1t2

Slope 1

Slope 2

t3

Slope 3

Imax


BI.KSW parameters corresponding to the nominal injection bump of -35 mm

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KSW Envelope SpecificationsKSW Magnet Current

LHC- small emittance beams

High intensity – Large emittance

Fastest decay Slowest decay

G.Grawer

Deviation from reference curve < 1% during injection

Old values


“Slope 1”: 10%-60% currentdecay in 5-30 ms

“Slope 2” plateau (1-2% variation) current decay in 10-70 ms.

High intensity – Large emittance

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Foil Test


Possible measurements:• Stripping efficiency (degradation)• Losses• Emittance growth

18

Foil Test


Possible measurements:• Stripping efficiency (degradation)• Losses • Emittance growth

BQD [T]

Beam size at the foil

V. Dimov

19

Stripping efficiency


M. AibaSEM grids out of the beam line avoid p+ production at wires

BCTs resolution = 0.1 mA

A difference of 0.4 mA between upstream and downstream of the 150 µg/cm2 stripping foil is calculated while for thicknesses larger than 200 µg/cm2 no measurable difference is expected (need accurate relative calibration)

Continuous BCT monitoring to evaluate long term degradation foil lifetime.

Possible test: 400 µs pulse and the minimum beam size at the foil (9T) (beam x2 bigger than at PSB injection) stripping foil degradation?N.B. SEM grids out!

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Losses and Emittance Blowup

• Losses at the level of few 109 protons (for the nominal intensity of 1014 H− from L4) are expected measurable (limit 10 pA) provided definition of optimum BLM location (tbc)

• Optics conditions close to the nominal L4 values at the PSB injection point, can be obtained by powering the quadrupole at 9 T/m. – Emittance blowup of 2-3%, both in the horizontal and vertical

plane, is expected for a 200 µg/cm2 foil and 4-5% for 300 µg/cm2 hardly measurable!

– A blow-up larger than 10% can be obtained only in the vertical plane with 2.5 T/m at the QD.


21

Half-Sector Test

• Define optics at the foil: achievable parameters, flexibility, etc. (MAD-X calculations without SC…)

• What do we expect to be able to measure• Define responsibility…


22

Status- what is missing – issues?

• L4 people checked the BI-TL optics and apertures (Ring 3) OK! • BI-TL apertures re-checked (Ring 3) by BTP for sensitive elements (DIS

and SMV, data from A. Lombardi plus conservative assumptions) OK!• BI-TL: MADX calculations (wo SC) are ongoing fully independent check

of all optics for all 4 rings • PSB injection region: beam size calculation at foil, beam dump & related

diagnostics (stripping foil) OK!• KSW: HW specifications frozen• KSW waveform:

– Limit conditions and envelope defined OK for generator production – Updated table with waveform for all users still missing!

• Foil test: – Preliminary estimates of beam parameters at foil and what can be measured– BLM position to be checked

• Half-sector test:– No study done yet (in BTP)– Define responsibility!



Thank you!

25

PSB Users


norm. Emittance [mm mrad]

User Intensity/ring H V

LHC25A/B 2.96E+12** < 2 < 2

LHC BCMS 1.48E+12** 1 1

LHCPILOT 5.00E+09 1 1

LHCINDIV 2.30E+10 / 1.35E+11 2 2

SFTPRO 6.00E+12 8 6

AD 4.00E+12 8 6

TOF 9.00E+12 10 10

EASTA/B/C 1.00E+11 / 4.50E+11 3 1

NORMGPSNORMHRS

1.00E+132.50E+13 15 9

STAGISO 3.50E+12 8 4

CNGS-like 6.00E+11 / 8.00E+12 10 8

**G. Rumolo’s Tables https://edms.cern.ch/document/1296306/1

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Beam envelope at the end of injection (KSW bump = -9.2 mm, BSW bump = 45.9 mm):

Circulating beam

injected beam H-

H-

H0

BSW4

Dum

p

BSW3 BSW2

BSW1

Strip

ping

foil

Strip

ping

foil

x [ m

m ]

s [ m ]

r.m.s norm. emitt. hor =9 mm mrad

Negative KSW bump

ISOLDE


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Injection over 40 turns (1e13 p+ per ring, 40 mA current from Linac4)Longitudinal paintingMatched optics in beta and dispersionInitial vertical offset of 7.5 mm

100% Imax 60% Imax in 12 ms (t1 = 12 ms)60% Imax 59 % Imax in 28 ms (t2 = 40 ms)59% Imax -26% Imax in 15 ms (t3 = 55 ms)

x [mm]

y [mm]

x [mm]

y [m

m]

ISOLDE


28

ISOLDE100% Imax 60% Imax in 12 ms (t1 = 12 ms)60% Imax 59 % Imax in 28 ms (t2 = 40 ms)59% Imax -26% Imax in 15 ms (t3 = 55 ms)

H-

H0

BSW4

Dum

p

BSW3

Strip

ping

foil

Strip

ping

foil

x [ m

m ]

s [ m ]

12 24 36 48 60 72 84 96 1081201321440

50

100

150

200

250

# PSB turns

# lo

st p

artic

les

Total: 1.1% beam lost52% of losses occur when KSW ~constant

Injection over 40 turns (1e13 p+ per ring, 40 mA current from Linac4)Longitudinal paintingMatched optics in beta and dispersionInitial vertical offset of 7.5 mm


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Beam envelope at the end of injection (KSW bump = 0 mm, BSW bump = 45.9 mm):

Circulating beam

injected beam H-

H-

H0

BSW4

Dum

p

BSW3 BSW2

BSW1

Strip

ping

foil

Strip

ping

foil

x [ m

m ]

s [ m ]

ISOLDE

r.m.s norm. emitt. hor =15 mm mrad


30

100% Imax 48% Imax in 14 ms (t1 = 14 ms)48% Imax 47 % Imax in 26 ms (t2 = 40 ms)47% Imax -26% Imax in 15 ms (t3 = 55 ms)

ex

ey

J.L. Abelleira

X [mm]

Total: 6.5% beam lost


Work ongoing to find the best tradeoff between target intensity/emittance and losses minimization for all users!

ISOLDE

specifications for psb injection system upgrade c. bracco, j. abelleira on behalf of btp...

Documents

beam h h

beam slide

beam size

beam parameters

beam disp

beam envelopemm27

mev h injection slide

beam envelopemm20