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EMMA Extraction. Bruno Muratori. Extraction (07/03/11). Going clockwise towards extraction Yellow = Inj. Kicker1 Pink = Ext. Kicker1 Green = Ext. Kicker2 Magenta = beam Action of injection kicker too early to be seen Magenta spikes = turns Effect of extraction clearly visible

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emma extraction

EMMA Extraction

Bruno Muratori

extraction 07 03 11
Extraction (07/03/11)
  • Going clockwise towards extraction
    • Yellow = Inj. Kicker1
    • Pink = Ext. Kicker1
    • Green = Ext. Kicker2
    • Magenta = beam
  • Action of injection kicker too early to be seen
  • Magenta spikes = turns
  • Effect of extraction clearly visible
  • Image seen on first YAG screen in extraction / diagnostic line 
  • Extract at every turn !
problems
Problems …
  • Cannot reach YAG-02 or any after it …
  • Cannot even reach second BPM …
  • Septum aperture clearly seen
details
Details
  • We see beam on BPM-01
  • Beam centred (+/-) on YAG-01
  • Tried many (though not all …) combinations of quads on & off

BPM-02

YAG-01 & SLIT-01

BPM-01

Possible trajectory

YAG-02

EMMA

3 correctors located here – two vertical & one horizontal

possible solutions
Possible solutions
  • BPM-02 not working correctly
    • BPM-01 & 02 changed at source for next run
  • SLIT-01 somehow in the way
    • Slit moving when light on YAG-01 & it is out so this should not be the problem - checked
  • All YAGs have metallised coating on one side
    • Could it be the wrong way around ? To be checked
  • Obstruction in the beam pipe ?
    • Only extraction line, could open up - to be checked
  • Quad scan on YAG-01 & re-match from there ?
  • Quadrupole misalignment ? Other ?
extraction set up 1
Extraction set-up (1)
  • K1 & K2 occur at time t1
  • Revolution time ~ 55 ns
  • Orbits → outside as energy increases
  • Set 18.5 MeV/c equivalent first (higher ?)
  • Make sure 18.5 MeV/c set-up optimised
  • Set extraction kickers (K3 & K4) and septum to:
  • Time t1 + ~ 25 × 55 / 42 ns + N × 55 ns
  • Pick good setting with many turns (~ 50 or more)
  • Try several other values of N
  • Set extraction line at 12 MeV/c
extraction set up 2
Extraction set-up (2)
  • Look on YAG23 to make sure beam towards outside as expected
  • Change septum & kicker strengths until something is seen on YAG-01 in extraction
  • Make sure beam as centred as possible down extraction line
  • Look at YAG-02 in extraction
  • Do not accelerate at first
  • Repeat for many equivalent energies (10 – 20 MeV) & extract to 12 MeV extraction line
  • Save settings throughout & compare to model
extraction set up 3
Extraction set-up (3)
  • Last BPM in injection line currently used as trigger so, from LeCroy scope, re-cable and:
    • Set timing of K1 with this BPM as trigger then
    • Use K1 as trigger for extraction
  • Set the timing of the extraction septum by:
    • Ch 1: Injection septum, Ch 2: Extraction septum
  • Then:
    • Ch 1: K3, Ch 2: K4, Ch 3: BPM E23, Ch 4: K2, Aux : K1
  • I have been told there are five (already labelled) cables available: 3 for extraction magnets & 2 spares
extraction set up 4
Extraction set-up (4)
  • Extraction with acceleration:
    • Set 12 MeV/c in extraction line as before
    • Set cavities to right crest & zero volts
    • Put bunch in bucket
    • Extract beam as before (1/2 turn & multi-turn)
    • Look at YAG-01 in extraction line
    • Slowly increase cavity volts until bunch leaves YAG-01
    • Set 18.5 MeV/c in extraction line
    • Estimate number of turns required to achieve this
    • Inject real 12.5 MeV/c beam
    • Extract with YAG-01 & then YAG-02
ad