Download - MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

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Page 1: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

MuCool / Linac Diagnostic Beamline and MTA facility:

External Beams Dept.C. Johnstone, + others

Review Nov. 30, 2005

Page 2: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Purpose:

test the basic techniques and components proposed for muon ionization cooling and

provide accurate measurements of linac beam properties – important for future, stable high-intensity running of the downstream accelerators.

Page 3: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Description: The new beamline and facility consists of

15 Hz pulsed-magnetic extraction system which diverts an entire Linac macropulse into the new beamline

An ~50 m long beamline which feeds and ends in experiments housed in a 20’ x 40’ hall; the Mucool Test Area (MTA) Using civil construction and resources that remain from the

400-MeV Linac Upgrade; this project is considerably economical.

The experimental hall is shielded and separated from the Linac by 12’ of concrete blocks— the beamline penetrates through these shield blocks to the hall

The new facility is capable of: Accepting full Linac beam intensity (1.6 x 1013 protons @ 15

Hz) to within the radiological limits imposed by the current state of shielding and radiological controls

Page 4: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

MTA facility: Plan View

Page 5: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Low-loss Beam Extraction from Linac Extraction to MTA

Begins upstream and continues downstream of 400-MeV chopper to contain H- magnetic stripping losses to 10-4 level.

Requires 10” movement of Q74 upstream* The entire Linac macropulse is extracted (the length of the

macropulse may be varied from 2-50 by the 750-keV chopper. Pulsed extraction magnets:

Pulsed extraction magnets: two “C” magnets One 3 magnet upstream and one 7.5 magnet downstream;

single power supply for both >1” of clearance/no conflicts with 400-MeV line No 400-MeV vacuum interruption for installation/removal Design is complete; bids are in; awaiting final division budgets

*kicking beam through Q74 causes a large displacement in the 2” Linac beampipe with accompanying high losses.

Page 6: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

400 MeV Linac Enclosure

~2m Extraction Drifts

Ramp trajectories

Ramp enclosure

wall

Page 7: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

H- Extraction Requirements

Beam entering ramp requires ~30 of bend relative to Linac Dipole field strengths

7kG to avoid stripping H-, upstream of chopper, ~6kG (Chopper is highly sensitive to electrons

and sparking) First component to clear is Q2

Controls beam separation to Booster/diagnostic line Cannot be moved; tricky to align Requires 11” to clear manifolding, 13-15” beam center to center

relative to transfer line Next element to clear is lambertson

Dipole (CR) conveniently fits next to transfer line between Q2 and lambertson

If CR dipoles are used (10 max) another one is required to avoid enclosure corner, 45 total is required for ramp curvature and align beam parallel with the experimental hall enclosure.

Page 8: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Linac modifications: Q74 moves ~10’ upstream Quad to be movedBLD – will be removed

to make space for quad

Page 9: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Two C magnet: 10”, 25” long, 6.2 kG, 3, 7.5 bends

Chopper

Pulsed Extraction System: Two C Magnets

Page 10: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Extracted Beam trajectories

Page 11: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Critical Path: C magnets

76.281”

(1.9375 m)

sssssssssssssssssssssss

zz 10”

0.254 m

IRON

Tube 2”

0.0625” WALL 304 SS

1.5” Beam Tube

Z16.75” slot

(0.4254 m)

(17.8” total

flange to

quad steel)

QUADRUPOLE

3.005

4.563”(0.1159 m)

25.866”(0.6570 m) IRON z

4.869”(0.1126 m)

TUBE 304 SS 3.25”

0.0625” WALL

R1.625”

(0.04128 )

1.949’ (0.0495 m)

4.618”(0.1173 m)

X

2.125” min (0.0540 m)

See example coil and lamination details in text + tables

2” schedule to pipe

1.850”(0.0470 m)

Example coil(0.4096” Cu):

Gap: 2.000”

~1/16” spacing between beam tubes@entrance to magnet

Beam tubes in longer magnet

Page 12: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Diagnostic Line Design -

New design incorporates 10 m straight for transverse emittance measurements of

linac beam 50 cm low beta waist at center of straight Order of magnitude change in beam size Access to low beta focus point Dispersion suppression

Inexpensive straight bore through shield blocks Simple, stable match to linac based on linac FODO cells

(~90) High (~7m) dispersion point for momentum-spread

measurement

Page 13: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Optical functions

Page 14: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Half-width beam size:

MW

1

MW

2

MW

3

Experimental Hall

Shi

eld

b

lock

s

Page 15: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Layout, plan view

Shield blocks

Page 16: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Operational details of Diagnostic Tune Minimum beam stay clear –

0.3” (8mm) in upstream 2” chopper mating flange and triplet quadrupoles based on 10 mm-mr linac emitance.

Dispersion suppression can be checked and tuned by : varying linac output energy and varying last CR dipole strength Beam will be “steered” into hall using trims after the diagnostic straight

Low-beta waist can be adjusted and focused onto the second multiwire (just downstream of shield blocks) Using the quad low-beta triplet

Critical Devices: Pulsed extraction magnets Beam stop upstream and downstream of shield blocks

Occupancy and radiological controls Beam stops provide unlimited occupancy in experimental hall Postings, fencing, eberm module will allow us to run at ~1 Hz and full

linac intensity Pulsed power supply will be hard-wired to 1 Hz.

Page 17: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Low-loss beam tune for MTA running Beamline can be re-tuned for MTA experiments to achieve the lowest-loss

optics. One example is given below with momentum spread included. The peak beam envelope is reduced by 1 cm in the half width (2 cm full width). If a polarity flip of the quadrupole is allowed, even smaller beam envelopes can be achieved.

Page 18: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Component Inventory

Description # required #available Peak power specifications per component

Quadrupoles(9 200-MeV quads, 5 Pbar quads to be removed from old 8 GeV line during shutdown)

14 14 50V x 40 A

Pulsed Extraction dipoles(designed, bids are in, contract awaiting budget decisions)

2 to be built 500-1000 A (under design)

Cooling Ring dipoles(4 with refurbished coils, to be removed from A0 during shutdown)

5 >10 18V x 711 A

Air Core Trim dipoles 8 8 24V x 12A

Page 19: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Power supplies and power requirementsDescription # Power Supply

RequirementsPower (potential

peak power)kW

200-MeV. QuadrupolesPbar quadrupoles(many old supplies are available)

95

14 (50V x 40A) 28

Pulsed Extraction dipoles(power supply to be built in house)

2 300V x 800A700V x 800A

0.4 0.6

Cooling Ring dipole string(Trans Rex)

4 4 (18V x 711A) 51

CR dipole, single(Trans Rex or PEI)

1 18V x 400 A 7.2

Trims(need to build bulk supply)

8 8 (24V x 12A) 2.3

Total Power 90 kW

Page 20: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Resource Synopsis: M&S

Beamline ComponentsWith the exception of the C magnet, all beamline components are available

quadrupoles and dipolestrim magnetsdiagnosticsbeam stops

instrumentation and controls such as an eberm system

Power SuppliesWith the exception of the pulsed power supply,

all major supplies and a number of smaller ones are availabledipole supplies

misc quad and trim supplies

Vacuumion pumps are available (30 liters/min)

misc vacuum components

Water55 Linac water is available

Tevatron sled available

Page 21: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Resource requests: Summary

PPDC magnet

PPD Machine shop:magnet stand fabrication/modify existing stands

spool pieces

TDmagnet inspection and testing

small repairs (hoses)

AD (SWF)C magnet power supply labor

Installation:vacuum, safety, water, power supplies, beamline, controls

Muon FundsC magnet power supply parts

electricianscable tray and civil (6” bore through shield blocks)

Page 22: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

C magnet specifications:General Value

Bpeak, range 6.0 - 6.5 kG

Repetition Rate 15 Hz

Pulse Length (half sine wave) 8.33 msec

Integrated strength, error

1st magnet 0.1668 T-m, 1% at peak

2nd magnet 2.5 1st magnet strength, 1% at peak

Good Field Region

Width, field error 0.0600 m ( 2.36”), 10-3 at peak

Gap 0.05100 m (2.008”)

Beam tube (elliptical) ~width x height 0.1173 m (4.618”), 0.0508 m (2”)

Beam tube thickness 1.59 10-3 m (0.0625”)

2nd magnet:

Tube diameter, thickness, outside beamline 0.08255 m(3.25”), 1.59 10-3 m (0.0625”)

Center to center spacing - beam tubes@upstream magnet entrance

0.1126 m 0.0003 m (4.433 0.006”)

Page 23: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

C magnet specificatons cont…Physical Dimensions

Minimum spacing between coils (top to bottom) 0.1080 0.0064 (4.25 0.125”)

Maximum slot length

1st magnet 0.4254 m 0.0064 (16.75 0.25”)

Maximum steel Length

1st magnet 0.2604 m (10.25”)

Required Mechanical Properties

Operational flexing or fatiguing of coil+core 0.1 mil

Coil or Core temperature rise, at any point <10 C , for

Cooling water available ~1 gal/min @60psi and 95F

Connections, water and power Standard Fermilab connections

Page 24: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

06 Shutdown Tasks - complete Quadrupole move Installation of new chopper flanges and gate valve Further installation can then proceed independent of linac

and as time and resources permit

Page 25: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Chopper Modification Drawings

Page 26: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

New Chopper Parts: detail

Page 27: MuCool / Linac Diagnostic Beamline and MTA facility: External Beams Dept. C. Johnstone, + others Review Nov. 30, 2005.

Status of MTA/Linac beamline - summary Line design complete and components identified

Final layouts and full engineering in progress C magnet bids contract awarded to Everson;

shipping by Jan, 2007 Q74 move and chopper modifications/gate valve

completed ’06 shutdown and A0 CR dipoles pulled from Tevatron enclosure Further installation can now proceed without vacuum

interruption/disruption to Linac or Booster

Installation complete in ’07 shutdown