@ Ya mur Torun Illinois Institute of Technology MAP 2015 Spring - - PowerPoint PPT Presentation

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@ Ya mur Torun Illinois Institute of Technology MAP 2015 Spring - - PowerPoint PPT Presentation

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@ Ya mur Torun Illinois Institute of Technology MAP 2015 Spring Meeting FNAL May 21, 2015 MICE RF Module Prototype Special vacuum vessel housing the 1 st EPd MICE cavity Aka SCTS, SCM, #@$*! Assembled in Lab-6 Moved

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SLIDE 1

Yağmur Torun Illinois Institute of Technology MAP 2015 Spring Meeting FNAL – May 21, 2015

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SLIDE 2

MICE RF Module Prototype

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 2

  • Special vacuum

vessel housing the 1st EP’d MICE cavity

  • Aka SCTS,

SCM, #@$*!

  • Assembled in

Lab-6

  • Moved to MTA

Hall May 2014

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SLIDE 3

Assembly in Lab-6

3 May 21, 2015 Yagmur Torun | MAP 2015, FNAL

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SLIDE 4

Cavity insertion

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 4

  • Fixtures, alignment tools in hand
  • Struts rebuilt
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SLIDE 5

Tuner tests (Lab-6)

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 5

  • L. Somaschini, M. Sc. thesis
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SLIDE 6

Couplers

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 6

  • Leak check fixture built
  • Design updated
  • Modified flanges and support for

easier installation/adjustment

  • Holes plugges
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SLIDE 7

Assembly in Lab-6

7 May 21, 2015 Yagmur Torun | MAP 2015, FNAL

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SLIDE 8

Transport to MTA

8 May 21, 2015 Yagmur Torun | MAP 2015, FNAL

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SLIDE 9

Instrumentation

  • The most heavily instrumented cavity system in

MTA history

– water pressure, flow, temperature – RF coax N2 pressure – tuner actuator N2 pressure – external plastic scintillator counters – radiation dose rate monitors – temperature sensors on cavity body – acoustic sensors on cavity body – fibers for light inside cavity and near RF windows – cavity field pickup probes – cavity, vessel, manifold vacuum pressures

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 9

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SLIDE 10

Run History

  • MICE cavity powered Aug 4, 2014

– 1 MW (old baseline) Aug 7

  • Shifts starting Sep 2014, 24x7 coverage
  • Operated until Nov 26, 2014

– during Fermilab accelerator complex shutdown – 61% uptime, 74% shift coverage

  • B=0, Cu windows
  • Demonstrated

– operation at power (3.5+ MW) well beyond new baseline – frequency control with (5) tuners

  • Next step: reconfiguration for B-field

– also Be windows & full tuner system

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 10

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SLIDE 11

Tuning tests (5/6)

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 11

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SLIDE 12

RF Controls (D. Peterson)

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 12

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SLIDE 13

Interior Inspection

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 13

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SLIDE 14

Reconfiguration (Jan-Feb 2015)

  • Interior inspection

– no damage seen in cavity or near coupler windows

  • Be windows installed
  • Frequency measurements with spacers under

window

– Matches Tianhuan’s prediction

  • Missing actuator installed

– Another leaky one replaced with spare

  • Succesful pump-down

– Vacuum leak at RF window instrumentation port

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 14

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SLIDE 15

Reconfiguration

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 15

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SLIDE 16

Reconfiguration

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 16

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SLIDE 17

Reconfiguration

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 17

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SLIDE 18

Reconfiguration

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 18

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SLIDE 19

Services

  • Water cooling

– Average power/cavity up by 60% in new MICE baseline (1.6 MW)

  • increased temperature differential across the 2 faces

– Flow through cavity circuit limited by pressure drop – MTA RF pulse has 10-20% of flattop but can run at up to 10 Hz

  • ran at same/higher average power
  • Actuator gas

– Tuners measured to 100 psi, 80 psi available in hall

  • Much less needed for operation

– Transfer function +3/-4 kHz/psi – Cavity bandwidth is ~4 kHz – Expected temperature dependence -3.4 kHz/C

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 19

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SLIDE 20

Vacuum system

  • Original layout (single getter pump at bottom of cavity) did not have

enough pumping speed or capacity for cavity+vessel

  • Blocked space between cavity bottom tube and vessel
  • Added turbo pumps on flange plate to handle vessel load

– not an option in magnetic field

  • Large leak path still present through coupler holes

– addressed in latest design changes

  • New configuration with HV getter pump on flange plate
  • Retrofit resulting in complex system

– 9 pumps, 17 valves, 135+ flanges, 14 gauges

  • Be window safety considerations limit allowable differential

pressure between inside & outside of cavity

– Inside should be <0.1 uTorr – Outside shared by rest of cooling channel (few uTorr) – Need (at all times)

  • Large conductance for viscous flow
  • Small conductance for molecular flow

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 20

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SLIDE 21

Vacuum System (T. Anderson)

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 21

  • Detailed procedures prepared
  • Measurements made in different configurations to

– confirm outgassing loads, conductances, gas composition – provide data to be incorporated into final vacuum system design

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SLIDE 22

Vacuum vessel Vacuum pump/gauge controllers Vacuum pumps/valves

  • n flange

plate Wall pump station

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SLIDE 23

Recent Progress

  • Ran with Be windows (B=0) Mar 18-Apr 6,

24x7 shifts with some breaks

– 11 MV/m to confirm all is OK

  • B=5T run Apr 24-May 20

– Demonstrated/exceeded MICE operating parameters in 3M pulse stretch

  • Gradient (~11 MV/m), peak power (~1.8 MW)
  • With 0.8M pulses at MICE average power

– Also pushed higher

  • 14.5 MV/m, limited by amplifier power

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 23

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SLIDE 24

Pulse 6849000

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 24

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SLIDE 25

Pulse 6849000

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 25

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SLIDE 26

Pulse 6849000

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 26

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SLIDE 27

Pulse 6849000

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 27

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SLIDE 28

Status & Schedule

  • High-power run (B=5T, Be) finished yesterday
  • Intend to complete rest of the present run plan next

week

– B-field and gradient sweeps to investigate

  • Radiation rates
  • Dark current

– Full tuner system test under power

  • Shifters welcome
  • Possible future tests

– Inspect cavity interior and couplers – Measure Be window temperature – Run with a new coupler – Install/test new actuators – Beam test

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 28

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SLIDE 29

Design

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 29

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SLIDE 30

Assembly

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 30

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SLIDE 31

Installation

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 31

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SLIDE 32

Experience => MICE

  • The prototype under test in the MTA has mostly

the same components and interfaces as the MICE RF modules

– Module assembly

  • fixtures, procedures

– Services and instrumentation

  • vacuum system
  • cooling, thermal response

– RF system

  • cavity instrumentation and calibration
  • DAQ, signal analysis

– Tuning system – Controls, monitoring, interlocks

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 32

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SLIDE 33

Acknowledgement

Shift crew

  • Michael Backfish, Daniel Bowring, Ben Freemire,

Terry Hart, Chris Hunt, Alexey Kochemirovskiy, Peter Lane, Maria Leonova, Tianhuan Luo, Al Moretti, Dave Peterson, Milorad Popovic, David Speirs, Tim Stanley, YT, Colin Whyte, Katsuya Yonehara

May 21, 2015 Yagmur Torun | MAP 2015, FNAL 33