# Presentation: 219027

## Plans for Beta = 1 Cryomodules& Status at TESLA TTF

**Helen Edwards**
**March 15 , 2005**
**TESLA Material from: D Kostin, H Brueck, N Walker, C Pagani, W-D Moeller, L Lilje, B Petersen, R Brinkmann**

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## Beta 1 Cryomodule Outline

**Whats in a module & cost history**
**Proton Driver vs TTF, TESLA, achieved**
**TTF status**
- Module
- Cavity
- Input coupler
**SMTF our plans **(also P Limon and H Carter)
- Cavities
- Modules
**PD vs LC Development**
**Conclusions**

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## Cryo Module Parts

**Cavities**
**Power input couplers**
**HOM couplers**
**Mechanical tuner**
**Piezo tuner**
**Quad/steering **
**BPM**
**Cold mass structure, cryo lines, cavity support**
**Outer vac vessel, support posts**
**Instrumentation- **rf, e breakdown, vac, temp, magnet monitors, ....

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## CryoModule Costs History

**2002 Engineering Design Study (FNAL TM-2179) Est costs of TTF module ~1051 K Euro **
- Nb Material
- Cost reduct, bulk order
- CuNb, ...
- E beam Welder
- Production welder
- Input coupler
- Cost
- Process time
- Tuner
- Reliability?

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## PD Beta = 1 CryomodulesThe PD scale somewhere between TTF & XFEL

**Modules****	****	****	****PD****	****	****TTF/XFEL/TESLA****	**
- Energy in-out GeV	1.2-8.0		out 1-2/   20/    250-500
- Length km 		0.438		     0.15/   1.7/   28-40
- # modules		36		     5-7/    120/  1600-2400
**Cavities **
- Type			9cell TESLA	TESLA
- # cavities		288		    64/      ~960/ 20-30,000
- # TTF cavities built				80-100
- Cavities/module		8		     8/        8/       12/
**RF Unit**
- Cavities/kly-mod unit	36 {12}	8-16/      40/        36-24

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## PD Beta = 1 CryoModules

**Cavity Parameters****	****   PD/****ultimate****	**** TESLA****(****achieved)**
- Gradient	 MV/m		     26	       	     25module, 35cav
- Q			      >1e10	      0.8e10 mod, 1e10cav
- Beam Current mA	      _**8.6/    26**__**	**__**	**__**9**_
- Qext			      4e6/   1.5e6 	2.6-3.7e6
- Input coupler Power kW     _**220/    660**__**	**__**	**__**230-350, **__**600**_
- MacroPulse length mS	      _**3 /      1**__**	**__**	**__**0.8**_
- Beam Duty Factor %	      _**0.75/   1**__**	**__**	**__**0.4**_
- RF Duty Factor %	      1.0/     1.3		0.65
- RF pulse max length mS     4.2/    1.3		1.3-1.4
- Rep Rate Hz		      2.5/     10	            5 (10)

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## TTF Module-Cavity Evolution

**Modules- Types 1, 2, 3-  3 Generations & 10 Modules **
- Installed 1997 to 2004, cold time 5 - 44 months

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## TTF Module-Cavity Status 

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## Cavity and Module fabrication is mature

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## Further Cryo Module Evolution at DESY

**High gradient module- assembly this year**
**Module 3+ (pre XFEL prototype)**
- 2K quad cooling
- Quad TTF superferric w bpm, fixed to invar rod as with cavities
- Saclay type II tuners with integrated piezo
**XFEL prototype**
- N*Lambda/2 cavity spacing
- Possible metal seals of coupler to vac vessel
**Industrial tech transfer contracts in 05**
**Module test stand in 06**

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## Power Input Couplers

**TESLA specifications (1.3msec)**
- TTF	250kW 10Hz adjustable, flexable (15mm)
- TESLA 	250-500kW, 5 Hz,  fixed, fixed (1.5mm)
- Superstructure  555kW-1110kW, 5Hz, fixed, fixed
**PD**** **250kW, 4.2msec, 2.5Hz  or  730kW, 1.3msec, 10Hz
**TTF history**
- 3 coupler types built and operating: FNAL, TTFII, TTFIII
- Total of 40 used 97-04 Total of over 1/4 million coupler*hr
- Warm TW- TTFII tested to 1.8MW, 2Hz (others to 1MW)
- Cold Horiz Test SW- 33-35MV/m, 1.3msec, 10Hz
- TTFIII Cold test- 35MV/m, 600kW, 10Hz, 2400hr no breakdn
**Future: **more design variants, cost & processing reduction, industrial studies

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## Phases of SMTF Beta=1 Modules

**P. Limon (breakout)**

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## Our plans Cavities (in process)

**H Carter (breakout)**
**Cavities - Parallel path approach-starting this year**
- JLab adapt and commission their electropolish system(EP) for TESLA cavities
- JLab to commission EP system with two cavities supplied from DESY
- Cornell & AES to team on producing, BCP processing, and vertical dewar testing (VDT) 6 cavities
- JLab to tool up to build model, prototype, and 4 Tesla cavities
- KEK plans to provide 4 low loss (LL) cavities - higher gradient design to be processed and VDT at Cornell or JLab
- Consideration being given to buying 4 Tesla cavities from Accel
**Total cavities -18   Probably take at least 6 months to start seeing some cavities tested and at least 12-18 months to see sizable number  tested**
**Nb Material order for 12**

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## Our Plans- SMTF Modules (1)

**Step Zero- CryoCap#2 test in Meson by Oct-Challenging**
- Single cavity test with 4K helium and RF
- Cavity prepared at DESY
**DESY/FNAL module**
- DESY offered to provide a module TTF3+ in the mid 06, early 07 time scale
- This depends to some extent on FNALs preparedness to deal with module assembly and readiness for test
- Most likely implementation-
- DESY to send tested cavities ready for string assembly.
- String assembled in cleanroom at FNAL
- Module then assembled from parts provided by DESY
**US International ILC Module**
- Module assembled from cavities discussed above and components (eg cold mass) with possible contributions from collaborators.
**Schedule - Plan to assemble these 2 modules starting late 06 continuing in 07 and cryo-RF test at least one in 07**

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## Our Plans Modules (2)

**Design modification considerations for ILC**
- Cavity length- beam tubes same both ends ~ -3cm
- Tuner type- blade or Saclay type II, with integrated piezo tuner
-  Quad- BPM package and power leads- needs to be packaged for clean room assembly- consider HTC leads- TESLA assembly must fit in module length
- Quad location for maximum stability of BPM and minimum Quad vibration- below center post
- Review end pipe cryo connections- efficient use of space.
**For the future**
- HOM absorber (is it needed for PD?)
- Tuner stepping motor reliability
- Industrial design (DESY doing industrial tech transfer)
**Differences LC and PD (PD closer to XFEL)**
- PD Gradient lower- dark current and Lorentz force less
- Power coupler pulse length and power- PD longer, needs test
- Adjustable coupling beta for different PD beam currents
- Cavity spacing- LC mimimize, PD Lambda/2
- HOM coupler heating? But much less HOM power in PD
- Quad-BPM package- for PD may be smaller/weaker (like XFEL?)
- Alignment, Vibration- PD easier

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005

## CONCLUSIONS

**The TESLA Beta 1 module design is well advanced and will continue to be refined and industrialized for XFEL**
**Cavity performance is almost there for PD requirements, but must be proven to be consistent**
**The SMTF effort should bring this technology to Fermilab/ US industry and prove operational requirements**
**Differences between PD, LC and XFEL modules will happen, but should be small, assuring a well understood basis**
**The cost will be better understood with US prototypes. Designs for cost reduction and industrialization will be undertaken**
**We and XFEL/TESLA have plans that will continue to reduce technical and cost risk**

- H Edwards  - Proton Driver Director's Review

- March 15-17, 2005