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Main Injector Gap clearing kickers. Phil Adamson. Increasing intensity for NuMI. 11-batch slip-stacking. Slip-stacking. Neutrino experiments want more beam! Inject 11 batches rather than 6 But pay for it with increased losses (<95% efficiency). Slip-stacking recapture (real data).

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increasing intensity for numi
Increasing intensity for NuMI

11-batch slip-stacking

MI Gap Clearing Kickers

slip stacking
Slip-stacking
  • Neutrino experiments want more beam!
  • Inject 11 batches rather than 6
    • But pay for it with increased losses
    • (<95% efficiency)

MI Gap Clearing Kickers

3 losses 1 cause
3 losses, 1 cause
  • Uncaptured beam at start of ramp
  • Extraction losses caused by beam in extraction gap
  • Beam in injection gap – lost downstream of injection kickers

MI Gap Clearing Kickers

loss control in main injector
Loss control in Main Injector
  • Avoid activation of tunnel components
    • ALARA
    • Uptime
  • Other loss mechanisms dealt with
    • MI-8 collimators
      • Scrape transverse tails before injection
    • MI-30 collimators
      • Lose uncaptured beam at collimators rather than Lambertsons
    • Fuzzer
      • Eliminate extraction loss by clearing beam from extraction gap at 8 GeV

MI Gap Clearing Kickers

slide7

Longitudinal simulation for 11 batch slip stacking

+40MeV

6

9

-40MeV

7

10

8

11

0

588 buckets

MI Gap Clearing Kickers

idea gap clearing kickers
Idea: Gap Clearing Kickers
  • Problem: beam gets into injection gap, sprayed in 104-105 region when kicker fires
    • Solution: build new kickers to send beam to abort instead
  • Kicker must have fast (3 bucket) rise and fall time to match injection kicker
    • But kick horizontally
    • In fact, requirements are almost identical to new NOvA RR injection kickers

MI Gap Clearing Kickers

magnets built by td
Magnets built by TD
  • Fast rise/fall time, so need short magnets
    • 7 magnets to generate necessary kick

MI Gap Clearing Kickers

2009 shutdown
2009 shutdown
  • Install magnets in tunnel

MI Gap Clearing Kickers

it s not just a few magnets
It’s not just a few magnets
  • Kickers need power supplies, PFLs etc.
  • Kickers need to fire at 15Hz (or will in a few years time), so need temperature-controlled load
  • We didn’t have building space
    • Didn’t have penetrations for fluorinert piping
    • Didn’t have penetrations for HV cables
  • To get fast rise/fall time, need many small kickers, so need lots of all this

MI Gap Clearing Kickers

2009 shutdown1
2009 shutdown
  • Dig up berm to find top of tunnel
  • Drill through (carefully)

MI Gap Clearing Kickers

then build a building
Then build a building

MI Gap Clearing Kickers

and outfit it
…and outfit it

MI Gap Clearing Kickers

2010 shutdown
2010 shutdown
  • Complete tunnel work
    • Cables
    • Fluorinert
  • October 2010
    • All kickers ready to go
    • Begin comissioning

MI Gap Clearing Kickers

gck beam hits the dump
GCK beam hits the dump
  • Abort
  • GCK

MI Gap Clearing Kickers

kicker measurements
Kicker measurements
  • Inject beam into MI, fire kicker through it
  • Use MI damper to get bunch-by-bunch position measurement
    • Fit turn-by-turn data

MI Gap Clearing Kickers

rising and falling edges
Rising and falling edges
  • Edges within specification
  • Slower edge in damper measurement might be measurement artifact

Damper (beam) measurement

Calculated B from measured voltages

MI Gap Clearing Kickers

kicker tail
Kicker tail
  • For recycler, building “tail bumper” to cancel tail
  • Tail measurement similar to electrical measurements (good)

MI Gap Clearing Kickers

after numi returns
After NuMI returns

Kickersoff

MI Gap Clearing Kickers

after numi returns1
After NuMI returns

Kickerson. Circled loss due to steering error (later corrected).

MI Gap Clearing Kickers

beam loss 104 106 region
Beam loss, 104-106 region

GCK on

GCK on

11-batch slip-stacking

MI Gap Clearing Kickers

loss and activation
Loss and activation

Green points: contact measurement at V105

GCK on for a week

MI Gap Clearing Kickers

increased beam power
Increased beam power
  • Reached 400 kW in Main Injector
  • Looking forward to NuMI’s return

401 kW

MI Gap Clearing Kickers

gap clearing kickers a successful ad td collaboration
Gap-Clearing Kickers: a successful AD/TD collaboration
  • AD (power supply and vacuum components)
    • Christine Ader
    • Rob Reilly
    • Chris Jensen
    • George Krafczyk
    • Jim Biggs
    • Steve Ward
    • plus 12 technicians
  • TD (magnets)
    • George Velev
    • IouriTerechkine
    • Bob Jensen
    • Bill Robotham
    • Ollie Kiemschies
    • plus 5 technicians

MI Gap Clearing Kickers

the remaining loss spike
The remaining loss spike
  • Opened up 113 location last week
    • Found problem

MI Gap Clearing Kickers