ILC SCRF Test Facilities

ILC SCRF Test Facilities

Sergei NagaitsevFermilab

Fermilab May 17, 2006 DOE review 2

ILCAmericas This talk describes:ILCTA test facilities @ FNAL (in collaboration with many

institutions)• Vertical and Horizontal test of Cavities:

– Determine the maximum operating gradient of each cavity– Evaluate gradient spread, Q0 and their operational implications.– Measure dark currents, cryogenic loads, and radiation levels.

• Test of Cryomodules:– Measure gradient of cavities in cryomodules – Measure vibration of components, system trip rates & recovery times

• Beam Based Measurements:– Beam energy, stability, & energy spread– Wakefield measurements, HOM based alignment & LLRF issues

• Goal: Are the cryomodules “good enough” for the ILC ?Not described: RF Activities @ SLAC & FNAL (in

collaboration with many institutions)• Develop high power RF components for Main Linac• Development of LLRF and multi-cavity control systems • RF systems in support of ILCTA @ FNAL


ILCAmericas Vertical Test Stand

• Our goal is to rapidly advance the intellectual understanding of SCRF surface physics and establish process controls to reliably achieve high gradient ( 35 MV/M) SCRF cavity operation

• Approach: Establish a “tight loop” processing and test infrastructure in the U.S.

• Tight loop elements:– Cavity fabrication improvements ( e.g. single crystal)– BCP & Electro-polish facilities– High purity water and High pressure rinse– Vertical test facilities – SCRF experts & materials program to interpret results

• Vertical test facilities exist at Cornell and TJNL (bare cavities)• These are being modified for near-term use by ILC R&D • On a longer term ( 2007) new Vertical Test Stand (designed for

35 MV/M) cavity testing is being built at FNAL


ILCAmericas ILCTA_VTS

• A Vertical Test Stand VTS is sited in IB1 because this building currently houses the Magnet Test Facility large refrigerator capable of 60 W at 1.8 K

• Bare 1.3 GHz 9-cell Tesla-style cavities Measure Q vs. T and Q vs. Eacc

• 250 W (CW) RF power required at maximum gradient (Q=5x109, Eacc=35 MV/m)

• Installed in a vertical pit in the Floor• Shielding against X-rays and Neutrons is an

important issue for 35 MV/M cavities• Maintain “Controlled Area” status in IB1

<5 mrem/hr immediately outside shielding <0.25 mrem/hr in normal working areas

Industrial Building 1

LHe & vacuum lines

Cornell


ILCAmericas VTS Status & Plans

• Cryostat Design– Added phase separator to DESY design to improve

He Quality– Estimated RF duty factor possible based on IB1

cryogenic capacity– Started cryogenics controls modifications– Cryostat design in progress

• Radiation Shielding– Estimated x-ray flux from DESY data– Finalizing shielding design; prerequiste for finalized

civil construction design– Secure OK from Safety, then proceed with Civil work

~ 2 months• RF & instrumentation

– Instrumentation design has begun– Rack layout, etc– Input coupler design will start soon

• On track to have a Vertical Test System to test high gradient cavities at Fermilab in 2007

One or two 9

cell cavities

VTS Civil Design


ILCAmericas Horizontal Test Facility

• Purpose: Verify dressed cavity performance (Eacc vs. Q0) to qualify cavities for assembly into a cryomodule – Bare cavities that pass vertical test are “dressed” with LHe cryostat,

coupler, & tuner then tested with RF pulsed power– Usually referred to as “Horizontal Test” since this test is performed in

this orientation at DESY in the Chechia facility • Horizontal Test Systems (HTS) are under design for ILCTA_MDB

(Meson Detector Building) and ILCTA_IB1 (Industrial Bldg 1)

4 cavities received from ACCEL4 cavities on order at AES2 cavities on order at TJNL4 cavities expected from KEK

Bare 1.3 Ghz 9 cell Cavity

Dressed Cavity

Horizontal Test@DESY


ILCAmericas HTS

ILCTA_MDB HTS• Cryostat:

– Accepts single “dressed” cavities, 1.3 GHz or 3.9 GHz– Similar to the DESY HTS but has access at both ends.

• Cryogenics:– MDB has an existing 1800 W @ 4 K cryogenic system– New distribution system built to supply cavity test areas– Large vacuum pump has been added to achieve 60 W at 1.8 K

• RF System: – 200 KW klystron & modulator provides pulsed RF power

ILCTA_IB1 HTS• A second HTS will be built for IB1

– Improved throughput (HTS is bottleneck @ DESY)– Design improvements – Accepts two 1.3GHz cavities simultaneously.


ILCAmericas HTS Status & Plans

• ILCTA_MDB– Phase I: Qualify six 3.9 GHz cavities for DESY TTF-VUV-FEL– Phase II: Qualification and R&D for 1.3 GHz cavities for ILC

• Cryostat being fabricated at PHPK (Columbus, OH)– Delivery: end of May-2006

• Cryo lines to cave installed, interface to cryostat (feed can) under construction

• Working 1.3 GHz RF system in MDB– Operated daily (Capture Cavity 2 testing)– Gathering components for 3.9 GHz


ILCAmericas Schedule

• Delivery of MDB cryostat in May-06• Connect to MDB cryo system and commission

– RF commissioning in parallel– Ready for 3.9 GHz cavity testing by end June

• FY07: Construction of 2nd HTS in IB1– Exploits existing facility to increase cavity throughput– Allows LLRF R&D on driving multiple cavities w/ one

klystron


ILCAmericas

MDB Transfer Lines & feed cans

This feed can was designed at SLACand built at FNAL


ILCAmericas Capture Cavity 2

Capture Cavity 2 is a high gradient superconducting cavity destined to upgrade the A0 PhotoInjector to 40 MeV. This opportunity has been used for FNAL to learn the intricacies of SCRF work as well as to test FNAL facilities.

It is a collaborative effort:– Tesla 9-Cell 1.3 GHz Cavity (AC68): DESY (33MV/m)– Slow Tuner: Saclay & FNAL– Old Cavity (in cryo vessel): Saclay– Cryo Vessel: IPN Orsay– LLRF: DESY & FNAL (SNS)– Groups within FNAL: AD, TD, CD

4.5 K Operation & Testing– Peak Gradient– LLRF testing– Piezo Fast Tuner Testing– Cavity vibration


ILCAmericas

Capture Cavity II Cold & RF power

First 1.3 GHz TESLA Cavity

in MDBCold and RF

power

MDB Cryogenics60 W @ 1.8 K

Klystron200 KW


ILCAmericas RF In CC2: Peak Gradient

RED = P-trans = gradient

YEL = P-reflected

BLU = P-forward

~ 27.5MV/m

Driving with a 1.38mSec (~100kW) square RF pulse: “Full Blast”

Q-loaded: 4.28E6

(any higher in gradient and cavity displays quenching)

When compared with critical field (temp) plot, this suggests quenching at 1.8K at 33MV/m.


ILCAmericas ILCTA_NM @ Fermilab

New Muon Lab FNPL Photo-injector

Building a ILC cryomodule test area in the New Muon Lab (ILCTA_NM)– Cleaning out building (Done) except for CCM

• Preparing to remove CCM– Plan to move Photo-injector– Work is in progress to install interim cryogenic solution in FY06– Will build part of the cryogenic distribution system in FY06– Funding Can not start Cryomodule feed cans until FY07

11/05


ILCAmericas ILCTA_NM schematic

round to flat beam transformation

(will be 3)


ILCAmericas ILCTA: ILC RF unit at

Fermilab

Plan is to build one RF unit to be tested with Beam by 2009.

07

0908

0607-08


ILCAmericas

A0 photoinjector A0 photoinjector - comment ILC

bunch charge (nC) up to 16 3.2

bunch spacing (nsec) 1000 330

RF pulse length (ms) up to .6new gun design required to

prevent overheating and breakdown

1

pulse repetition rate (Hz) 1 requires RF upgrade to increase rep. rate 5

normalized horizontal emittance (mm-mrad) 40 (@ 0.5nC) 8 (DR extraction);

10 (IP)

normalized vertical emittance (mm-mrad) .4 (@ 0.5 nC) .02 (DR extraction);

.04 (IP)

emittance ratio 100 (@ 0.5nC) 400 (DR

extraction); 250 (IP)

RMS bunch length after bunch compression (mm) .5 (@1 nC) .3

RMS momentum spread after compression (%) ~4 (@1 nC) 1.1

polarized? no R&D in progress -- vacuum issues may be difficult yes


ILCAmericas

NML Heat xchanger & LN2 Dewar

A satellite refrigerator installed.Need one more to run 3 cryomodulesat 5 Hz


ILCAmericas

Single Satellite Refrigerator forPI & One ILC CM

Measured Data

5.0 Hz

4.0 Hz

2.0 Hz 1.0 Hz

0.5 Hz

Rep Rate= 0.1 Hz

0

100

200

300

400

500

600

700

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

Liquefaction (g/s)

Ref

riger

atio

n (w

atts

)

Theoretical Line

PI Cap Cav I: 12.5 MV/m, 5E9 Cap Cav II: 30 MV/m, 5E9 3.9 Accel: 15 MV/m, 5E9 3.9 Trans: 5 MV/m, 5E9ILC CM: 31.5 MV/m, 5E9


ILCAmericas

Two Satellite Refrigerator forPI & Three ILC CM

5.0 Hz 4.0 Hz 2.0 Hz

1.0 Hz

0.5 Hz

Rep Rate= 0.1 Hz

0

200

400

600

800

1,000

1,200

1,400

0 1 2 3 4 5 6 7 8 9

Liquefaction (g/s)

Ref

riger

atio

n (w

atts

)

Two Satellite Refrigerator Theoretical Line

PI Cap Cav I: 12.5 MV/m, 5E9 Cap Cav II: 30 MV/m, 5E9 3.9 Accel: 15 MV/m, 5E9 3.9 Trans: 5 MV/m, 5E9ILC CM: 31.5 MV/m, 5E9


ILCAmericas

Cryomodule end cans Delayed to FY07 ($$)

Cryomodule Test at DESY TTF

End Cans


ILCAmericas Summary

ILCTA_NM:• Installing Cryogenics, vacuum pump, plumbing,

electrical infrastructure, laser room, controls, etc • Plan to move FNPL photo-injector to New Muon in 07

– Will provide ILC like beam to test cryomodules

• Building transfer lines, feed cans, etc.• FY06: Funded from Fermilab “SCRF infrastructure”

from “core” program funds at FNAL ie not via GDE• FY06 progress is limited by available cash

– Needs serious funding in FY07

• Will provide test of 1st U.S. built Cryomodule in 2007


ILCAmericas Systems Tests

• It is Fermilab’s opinion that a significant systems test will be required in advance of ILC construction to verify:– Technical performance of critical/cost driving components– Systems integration– Vendor performance– Reliability of cost estimate

• Should include ~1% of final cryomodule count, produced by vendors in a pre-production run– Plan is to assemble into ~ 5 GeV electron linac– Mount in a near surface twin tunnel ILC mock up– Could include a demonstration damping ring in Tev Tunnel

• We propose to host this facility at Fermilab • Believe the correct approach is to develop requirements

first, then evaluate possible facilities.– Discussion with the GDE are in progress


ILCAmericas Conclusions

• Our prime objective is to build and evaluate the components of the ILC main Linac

• Also we need to acquire experience & expertise in the U.S. on SCRF technology

• We are building extensive infrastructure at Fermilab and SLAC in support of these goals– Cavity test facilities ( horizontal and vertical)– High Power RF test systems– LLRF test systems – Cryomodule Test facilities ( including beam tests )

• Significant Technical Progress in FY0506• Progress is limited by the available funding

ILC SCRF Test Facilities

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