Plan and opportunities for migration and integration of the photoinjector into new muon lab
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Plan and Opportunities for Migration and Integration of the Photoinjector into New Muon Lab. Mike Church AAC Review - 12/5/06. Current Photoinjector Layout at A0. 13m. (CC-1). P. Piot. Proposed NML Injector Layout (latest design). 22m. (CC-1, CC-2).

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Plan and Opportunities for Migration and Integration of the Photoinjector into New Muon Lab

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Plan and Opportunities for Migration and Integration of the Photoinjector into New Muon Lab

Mike Church

AAC Review - 12/5/06


Current Photoinjector Layout at A0

13m

(CC-1)

P. Piot

Migration of Photoinjector to NML

AAC Review 12/5/06 – M. Church


Proposed NML Injector Layout (latest design)

22m

(CC-1, CC-2)

(intended initially for ILC crab cavity tests)

P. Piot

Migration of Photoinjector to NML

AAC Review 12/5/06 – M. Church


NML Building Layout (front end)

u.s end of 1st cryomodule

egun

3rd cryomodule

(if no building extension)

Migration of Photoinjector to NML

AAC Review 12/5/06 – M. Church


Tentative Schedule

  • Photoinjector operations will continue at A0 through CY07

  • The move of the A0 photoinjector will be delayed until 1/08 so that T. Koeth’s thesis experiment can be completed

  • Upgrades that are planned at A0 before moving to NML include the following

    • laser: upgrade 2-pass and multipass flash lamp pumped cavities to diode laser pumped cavities

    • addition of downstream off-axis beamline for emittance exchange experiment (T. Koeth’s thesis)

  • New egun and modulator will be developed

    • A0 gun suffers E-field breakdown in RF-coupling slot for pulse lengths >300 msec

    • Modulator needs upgrade to operate at 5 Hz and 1msec pulse length

  • 2nd TESLA cavity (CC-2) is being conditioned at Meson Detector Building

  • 3rd harmonic cavity: will not be ready in early CY08

  • We estimate the move can be accomplished in ~4 months (not including beam commissioning)

  • We expect egun, modulators, and CC-2 to be ready for installation in early CY08

Migration of Photoinjector to NML

AAC Review 12/5/06 – M. Church


PITZ Egun (Photo Injector Test Facility at DESY Zeuthen)

RF coaxial feed

1 ½ cell RF cavity (1.3 GHz)

photocathode

laser mirror

Capable of delivering ILC beam parameters, with normalized transverse emittance ~4E-6

Migration of Photoinjector to NML

AAC Review 12/5/06 – M. Church


Photoinjector Upgrades for NML

  • Laser - no additional major upgrades for NML

  • Egun – entirely new – similar to PITZ egun design; capable of ILC beam parameters

  • Egun modulator – upgrade: 1 Hz  5 Hz; 300 msec  1 msec

  • Beamline – higher energy  decreased dp/p

  • 3rd harmonic cavity – shorter bunch length; higher peak current

  • Instrumentation – (possibly) new BPM’s

  • Off-axis beamline – addition of a 4-dipole dogleg will provide an off-axis beamline for testing ILC crab cavities, emittance exchange experiment, and other tests

  • Better integrated controls system –

  • Increased experimental areas – see P. Piot’s talk

Migration of Photoinjector to NML

AAC Review 12/5/06 – M. Church


Downstream Beamlines at NML

diagnostic section

spectrometer magnet (dE/E ~1E-4)

high energy test area

low power dump

beam spot size required to be >3mm

No room to slide cryomodules downstream!

high power dump (34KW)

Migration of Photoinjector to NML

AAC Review 12/5/06 – M. Church


Photoinjector Design for 3 Cryomodules and No Building Extension

Capture Cavity (1.3GHz)

low energy spectrometer

chicane (for bunch compression)

quads

dipole corr.

quads

dipole corr.

Egun

X

X

X

X

1st cryomodule

9.9 meters

BPM pair

X

instrumentation cross

current monitor

Migration of Photoinjector to NML

AAC Review 12/5/06 – M. Church


Bunch Compression (22.5° chicane)

Egun: Peak acc. gradient=20MV/m, phase=-10°

CC-1: Peak acc. gradient=16MV/m, phase=-37.5°

Before Chicane:

RMS bunch length =2.40 mm

After Chicane:

RMS bunch length =.34 mm

Migration of Photoinjector to NML

AAC Review 12/5/06 – M. Church


Comments on Reduced Photoinjector

  • Limitations:

    • No space for 3rd harmonic cavity – “banana” shape in longitudinal phase space – how does one interpret cavity measurements under these conditions? Can’t quite get 300 micron bunch length.

    • off-axis beamline does not have tuneable R56 (as in the full photoinjector design) – not suitable for ILC crab cavity testing

    • large momentum spread – very difficult to control beam size (maybe impossible)

    • Low energy (KE=18.2 MeV) – space charge may additionally blow up beam

    • No room for additional experiments

    • Minimal space for instrumentation and correctors – not sure we have enough

    • No flat beam transform

    • CC-1 not suitable (can only get peak acc. gradient=12MV/m); must use CC-2

Migration of Photoinjector to NML

AAC Review 12/5/06 – M. Church


Outlook

  • Moving the photoinjector from A0 to NML will provide opportunities for upgrades to permit full beam testing of 1-2 ILC cryomodules

  • The new photoinjector will provide opportunities to fully test ILC crab cavities

  • However, the space constraints put on the photoinjector after the addition of the 3rd cryomodule without a building extension make the photoinjector unsuitable for full beam testing of ILC cryomodules or crab cavities

Migration of Photoinjector to NML

AAC Review 12/5/06 – M. Church


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