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

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

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

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

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

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

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

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

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

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

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

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

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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