1. Completion of the MICE-US construction project

2. MICE-US construction project
Scope well known
Detector systems
Scintillating fiber trackers
Beam profile monitor (decommissioned)
CKOVs
LiH absorber
Spectrometer solenoids
Magnet systems
QPS system
Including extensive upgrades to original configuration
Partial Return Yoke
Step IV
Step V’ (now will not be used)
2 201 MHz RF modules
Everything complete except for delivery of the 2 RF modules
MICE Project Board March 7, RAL Alan Bross

3. MICE Project Board March 7, 2017 RAL Alan Bross
RF Modules
Complete stand-alone
system
MICE Project Board March 7, RAL Alan Bross

4. Body and Be window selection Frequency “tuning”
Cavity body (MHz)
Be Window In (MHz)
Be Window Out (MHz)
Final Frequency (MHz)
-0.517
Well within tuning capabilities of the MICE RF power system
MICE Project Board March 7, RAL Alan Bross

5. MICE Project Board March 7, 2017 RAL Alan Bross
Status
Module 2 “complete”
Leak tight
RF couplers
Cavity water feedthroughs
Actuators and gas lines
Beryllium windows
RF pickups
Turbo-pump and NEG
Vacuum gauges
Bypass line and pressure box
MICE Project Board March 7, RAL Alan Bross

6. RF Module 2 details Actuator with gas lines RF Coupler
Cooling Water Line
Differential Pressure Box
MICE Project Board March 7, RAL Alan Bross

7. MICE Project Board March 7, 2017 RAL Alan Bross
Vacuum tests
Module 2
Vessel 4X10-7 torr
Cavity 5X10-8 torr
This vacuum fine for operation
But expect ~ 5X lower in cavity when in operation in MICE
Pumping System
NEG Pump
Turbo Pump
Conductance to Cavity
MICE Project Board March 7, RAL Alan Bross

8. Note on background rates
We completed a very successful program testing the MICE pre-production prototype cavity in the MTA at Fermilab
Maximum gradient field on ~ 14 MV/m
Very low background x-ray rates at MICE gradient of 8 MV/m (actually will be lower given RF power source available for MICE). At 8 MV/m with MTA 4T:
Measured 2.2 mS/hr on 1.8m from high-gradient window
Scaling to MICE with 1ms RF flattop at 1 Hz rep. rate yields ~ 6.5mS/hr (0.65 mR/hr).
This corresponds to ~ 1 background hit/real muon hit
MICE Project Board March 7, RAL Alan Bross

9. MICE Project Board March 7, 2017 RAL Alan Bross
Module 1
Final assembly work
Install Be windows – initial pressure box tests were done with aluminum windows in case of failure
Reconnect vacuum system + RGA
Pump-down and leak check
Module #1 RF testing follows
MICE Project Board March 7, RAL Alan Bross

10. Be careful of things in “ ” Module 2 vacuum event
Power lost to roughing pumps, turbo-pump shut down
Another group in the LBNL main shops disconnected the power to the RF mod 2 vacuum system, reconnected, but never contacted MICE team
Vacuum went to 10-3 Torr level,
Beryllium windows protected
By-pass system worked
NEG pump failed and oxidized, causing particulate contamination in lower vacuum system and bottom of cavity
No contamination in the outer vacuum
Vacuum level recovered – no vacuum contamination
MICE Project Board March 7, RAL Alan Bross

11. MICE Project Board March 7, 2017 RAL Alan Bross
Module 2 vacuum event II
Cleaning procedure with Isopropyl alcohol on cavity surface and beryllium windows
Required opening module and gaining access to cavity interior
Rinsed inner surface with IPA and wiped with lint-free cleanroom wipes - process repeated until wipes came back clean
Successful -> removed particulate residues in lower vacuum components and cavity surface
Re-installed beryllium window and module end flange
System is currently under vacuum again and will be leak checked
Recovery appears to be successful and complete
Now pumping
Vacuum good, but RGA shows H2O and alcohol
Leak check tomorrow
MICE Project Board March 7, RAL Alan Bross

12. Module #2 Low Level RF test ready to start
FNAL control system installed
Actuator testing and cavity tuning frequency measurements ready to begin
Scheduled for the week of March 13th, 2017
1-2 days required for testing
LLRF test includes:
Cavity frequency and Q0 measurement
RF tuning system test
RF coupling measurement
Mark coupler orientation -> critical coupling
MICE Project Board March 7, RAL Alan Bross

13. RF modules – final steps
Complete LLRF tests on module 2 next week
Then begin crating
Following week leak check and LLRF on module 1
Then crate
To shipper by end of March
This will then complete the MICE-US construction project.
Note: normally installation and commissioning is part of the construction project, but will not be possible for RF modules at this time
Would require new agreement
MICE Project Board March 7, RAL Alan Bross

14. MICE Project Board March 7, 2017 RAL Alan Bross
Shipping RF modules
Ship by end of March
Modules will ship together
Be windows installed
RF couplers not installed, crated separately
Clear acrylic inspection windows installed on RF coupler spool pieces
Vacuum pumps and gauges installed
Modules we be backfilled with N2
Modules mounted on isolation pallet & then crated.
Provisions for Fork lift
Exterior windows on crate for inspection
Air shipment – arrival at Heathrow Airport
~ 2 week door-to-door
MICE Project Board March 7, RAL Alan Bross

15. END