upgrade of the sps injection kicker system mkp · jan uythoven sl/bt. group meeting 9 nov. ‘99...

Jan Uythoven SL/BT. Group meeting 9 Nov. ‘99

Upgrade of the SPS injectionkicker system MKP

l Present systeml Why do we need a new system?l Presentation of the new systeml Status of the PFNl Status of the magnetsl Magnetic field measurementsl Changes to the layout of BA1l Work in the coming shutdowns


Model of the present system

0 10 20 30 40 50longitudinal position@mD

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Kicker layout: oldsetup Optics: standard Calculated 12-1 -1999 at 11:19Particle = fixedtpEmittance = 0.75 mm mraddpêp =0.0005Size of injected beam is 5 sigma.

HV1 = 26.1kVHV2 = 26.1kVHV3 = 26.1kV

Dx =0. mm

Septum dist. = 35.8 mmSeptum angle = -1.79mradQuad displ. = -4.8 mmThetaMDPH = 0 mrad

Septum

TIDV QDA119MKP1 TO 3

MDPH

TBSJB

Fitted valueAgrees with actuallyused voltages

Clearance:5 σ + 8 mm

Fitted value


Present MKP system lay-out


MKP system requirementsBeam Injection

EnergyRise time Flat top Fall Time Ripple

LHCprotons

26 GeV/c < 220 ns 2.1 [µµs] machine3/11 full

< ±± 0.5 %

FixedtargetProtons

14 GeV/c <1000 ns 10.5 [µµs] 1.0 [µµs] < ±± 1.0 %

LHC ions 12.9GeV/c

< 115 ns 0.5 [µµs] machine3/11 full

< ±± 0.5 %

Fixedtargetions

12.9GeV/c

< 1000 ns 2.0 [µµs] 3.8 [µµs < ±± 1.0 %

Short rise time to keepPS bunch structure

Present kicker rise timeis more than 220 ns

Shorter rise time will beobtained by:- larger magnet impedance- shorter magnets

But:- extra magnets to have sufficient strength

Tighter !!


Model of the new system for theLHC type proton beam


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Kicker layout: tank3two17 Optics: standard Calculated 12-1 -1999 at 14:3Particle = LHCpEmittance = 0.11 mm mraddpêp =0.0011Size of injected beam is 5 sigma.

HV1 = 48.4kVHV2 = 48.4kVHV3 = 48.4kV

Dx=0. mm

Septumdist. = 35.8 mmSeptumangle = -1.62mradQuad displ. = -4.8 mmThetaMDPH = 0 mrad


New system for the fixed target protonbeam: don’t use fourth tank!


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Kicker layout: tank3two17 Optics: standard Calculated 12-1 -1999 at 12:13Particle = fixedtpEmittance = 0.75 mm mraddpêp =0.0005Size of injected beam is 5 sigma.

HV1 = 49.2kVHV2 = 49.2kVHV3 = 0. kV

Dx =0. mm

Septum dist. = 35.8 mmSeptum angle = -1.96mradQuad displ. = -4.8 mmThetaMDPH = 0 mrad

In this case MKP4has to produce amaximum pulselength of 2.1 µs instead of 10.5 µs


New system: dumped ion beamTightest on clearance


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Kicker layout: tank3two17 Optics: standard Calculated 12-1 -1999 at 14:20Particle = ionsEmittance = 0.8 mm mraddpêp =0.00015Size of injected beam is 5 sigma.

HV1 = 0. kVHV2 = 0. kVHV3 = 0. kV

Dx =0. mm

Septum dist. = 35.8 mmSeptum angle = -1.96mradQuad displ. = -4.8 mmThetaMDPH = 2.73 mrad

Clearance:5 σ + 3.5 mm


New MKP kicker lay-out


Comparison of Old and NewSystem

l Old System» 6 PFNs

» 8 S-type modules, 12.5 Ω» 4 L-type modules, 12.5 Ω

» 1 spare tank (L*), 4 modules

l New System» 8 PFNs» possibly 6 PFLs

» 12 S-type modules, 16.67 Ω» 4 L-type modules, 12.5 Ω

» 3 different spare tanks: 11 modules


Status of the MKP PFNsl 1.5 m long test coil made. Impedance checked: within 1 %.

l One PFN assembled with this test coil. Low voltagemeasurements with low power switch.

l Comparison of measurements and calculations» HV measurement of MKA switch characteristics ->

adaptation of the low power switch

» Adaptation of front cells

l Coming soon:» High voltage tests with this PFN» Adaptation of the front cells» Long coils, three different diameters to compensate

for resistive losses

l Still a lot of work to do!


Status of the MKP magnets I


Status of the MKP magnets II

l One prototype S-type magnet finished» High voltage measurement with PFL in air» Fast inductive and capacitive probes developed» Will have to be disassembled and modified for final version

l First ‘LS magnet’ should be under vacuum in 4 weeks time» Damping resistors

» Incorporated magnetic field probes →» Outgassing tests of ferrites

l New baseplates, frames etc.

l Production of second LS module started

l Series started, another 18 magnets to go!


Magnetic field probes

l Fast risetime and small ripple of magnetic fieldrequired

l New probes developed to measure this accurately» Inductive probe (two shielded coax cables) in the aperture:

most accurate, but can’t install this in the machine

» Capacitive pick-ups incorporated in the earth connectionplates

– Stays in the machine to check magnet and PFNs– Calibrated with inductive pick-ups


Results from the two different types ofmagnetic field probes

Capacitive pick −up incorporated , temporary shielding . Input filter on switch . Scaling factor 1.003Tek00006 .csv measured 4−11−1999 at 17:16Tek00009 .csv measured 4−11−1999 at 17:22Calculated 5−11−1999 at 14:36

-1. ×10 - 7 0 2.5 ×10 - 7 5.×10 - 7

0.92

0.94

0.96

0.98

1

1.02

1.04

Tek00006 .csv − Tek00007 .csv Hred L andTek00008 .csv − Tek00009 .csv Hblue L

-1. ×10 - 7 0 2.5 ×10 - 7 5.×10 - 7

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-0.02

0.02

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Tek00006 .csv − Tek00007 .csv minusTek00008 .csv − Tek00009 .csv

-1. ×10- 7 0 7.5 ×10

- 81.5 ×10

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Tek00006 .csv − Tek00007 .csvRisetime 1: 83.0004 ns Hbetween 5. % and 96. %L

-1. ×10- 7 0 7.5 ×10

- 81.5 ×10

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Tek00008 .csv − Tek00009 .csvRisetime 2: 79.0004 ns, Hbetween 5. % and 96. %L


Present layout in BA1


Proposed new layout

Faraday cage & racks other side ofloading bay


Work in the coming Shutdownsl Shutdown ’99 - 2000

» Install 6 new RG cables tunnel» Prepare electronic racks and cabling BA1» MDPH replaced by MDSH: stronger, final position, new pc

l Shutdown 2000 - 2001» Upgrade of all electronics and new Faraday cage

» Installation of 3 new kicker tanks (S-modules)» Modification 6 PFNs

l Shutdown 2001 - 2002» Replacement of 1 kicker tank (L-modules)

» Modification of 2 PFNs

l Shutdown 2007 - 2008 (about)» Installation PFLs or upgrade of the PFNs

upgrade of the sps injection kicker system mkp · jan uythoven sl/bt. group meeting 9 nov. ‘99...

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